brilliant method, can't believe I never thought of doing this, although a small airbrush kit for painting models could be a good substitute for the spray can
+Luke Knights already ahead of you mate lol Thanks for comment. Its a working progress, other ideas include using carbon paper and other methods of sealing paper or other media against the cylinder wall. There will be a follow up video coming soon on people suggestions which I'll try out. Thanks again - matt
Just an idea, and I really do not know if it would work: You could use photo paper (yes, the old fashioned stuff we used before digital photos), put it inside the zylinder in a redlight room and then use an LED or small tungsten bulb, that fit's inside all the ports. This should give you a damn accurate picture of the whole thing. Ofc that inculdes a lot of chemicals and stuff, but maybe you know somebody who does that as a hobby ^^
+Emilia Fairbrook Yeah that would work, also using carbon paper pressed against white paper would give a good impression, good idea, albeit abit complex - thanks for the comment - matt
Pony Power I like your carbon paper idea Maybe I will try this one out...I don't really want to spray my cylinder full of paint ^^ Or was the result with the airbrush really that much better?
I understand your concerns but a quick dip in some acetone cleans the cylinder out. You could even leave it there, the engine will burn with a bit of a funny smell for a few days but wont be too much of a problem. Petrol is an excellent solvent lol
Excellent idea, really I feel stupid for not coming up with it myself. Do you mind if I give it a go and record another video, I'll state that it was your idea, if thats ok with you? Cheers matt
You could also spray a bit closer to the ports, just get the nozzle of the spray can as close as possible, and I reckon 2 or 3 sprays should do the trick :)
Anže Thanks for the comment, I'm refining my method as time passes then will update you all with another video. All the suggestions used will have your names attached to them, any more ideas would be greatly apprieciated - thanks again matt
I actually used the balloon idea while attempting this and it works wonders! I found that using regular (ball-shaped) balloons helped, but the long cylindrical balloons (like the ones used for making balloon animals) worked the best. Also, too much paint will still bleed on the paper, even with a baloon. 1-2 quick sprays, and a gentle shake of the cylinder seems to yield the best results (aka -sharpest lines).
Didn't know someone already had this idea with the baloon :(. Thinking of this now i believe the baloon rubber could be a little ridgid. But a condom would be worth a try, less pressure little stress on the paper sheet, probably less deformation in the port area. But no one can tell untill you try it out ;).
Could use an over sized sponge (dry of course) to insert I to the paper and it would hold tightly and conform to the shape but also be gentle enough to not tear the paper up.
I´m using a realy cheap airbrush and it works fantastic for me . The transfers are still not very good visible but i will also try what Mandaz mentioned with the WD40 spraytip
wat actually works a lot better, is to tape the paper to the cylinder the same way you do it, then blacken your fingertip with graphite and rub it from the inside against the cylinderports. It will leave a very nice marking of the porting of the cylinder. And you dont have to remove a lot of paint afterwards.......
ice cream tube lid would be one option for plastic maybe.. if it's not already been mentioned. but I think papers best as the fiber will such up excess ink whereas plastics more leftly just to run.
The height of the exhaust port on the 70cc is higher is to reduce the compression height ot keep the compression ratio in spec with the higher volume cylinder.
I align the top edge of the paper with the top of the bore as an index as well as squaring up the page to it. Paint is ok but my dirty old fingers work ok to mark it from the inside too and easy to use a fine liner pen to finish it off once the paper is out.
Not everyone had dirty fingers. I'm not one of those people, great comment dude getting your hands stuff in is always the best way, but you know what these fairies are like today, latex gloves and the rest - matt
No gloves here I don't like that kind, Mechanic since 1976, old school. I tried the paint way its a good tip, just takes a bit of spray can control and I'm no spray painter.
nice idea, though i'm sure i would have gotten there had the problem came to mind, but what i would do is take a piston and us it to keep the paper tight to the cylinder, and use some of those air brushing sets for paper so it has less chance of bleeding and will wash off of the cylinder easily
how about stick one of those ballons used to make sausage dog models a kids parties down the bore before taping the paper,and inflating said balloon and leaving it to hold the paper slightly concave in the cylinder ports for better witnessing.just a thought,you know. Another great idea from a jock.
People got to make such simple things so trickie for themselves.. Just get the fucking cylinder top side down on a flat surface get the paper roughly cut it down to bore size, make sure it's all squared and rub the side of the pencil up and down all over the ports.. done.
if u used the map u have to layout a fresh paper u can put holes in the center of the port locations .. prior to inserting and painting .this should allow the paint through the ports to flow better so can maybe be done with less paint avoiding the runs
thinking about trex's balloon comment .. using rc tire foam inside the paper tube could both support the paper against the cylinder wall and absorb some of the extra paint if you have the holes mentioned in the above comment .. also use flat black .. it by far dries the fastest. other thought are to heat up the cylinder before painting to aid in drying time .. maybe a fan lightly vacuuming air from inside the paper tube through the foam will attract the paint to the ports better? another idea for the transfers is to extend the paint spray tip. so it can be inserted into the port before spraying.
Yes, like the balloon idea, but in this case use a piece of sofa cushion cut into the shape of a cylinder. Stuff it into a pvc pipe that is smaller than the bore of the cylinder, and with a stick or anything that will push the foam cushion out of the pvc pipe, leaving it inside of the paper cylinder, the foam cushion will push against the paper. I'm trying my best to explain what I mean. Or in other words use a pvc pipe and a stick to deposit a piece of foam cushion inside the paper cylinder. P.S. pony power thank you for your video. I like to teach people what i know, and like to learn from others.
+rynousa IT NOW HAS A NAME that I will never forget =).... Lol........ Believe it or not. I've taken a piston to a local welder for welding some aluminum on to top of the piston for more compression. I shaped the top of the piston myself so that the valves don't hit the piston. Then I brought the weight back to what it weighed before the welding. It's a four stroke engine, the compression is now around 13.5/1 or higher. This motor is a chinese 90cc honda clone. I don't know if it would work for a bigger cc engine, but it's worked just fine so far with this little motor. The sound of the exhaust changed a lot, and I now run octane booster. P.S. Hooray for the Tampon Method!!!!!!! Lol. Merry Christmas!!!!!!
This just an idea, what about a 2 pieces of paper and some spray glue them together 1 piece graff paper 1 piece carbon paper insert in cylinder take dowel rod and rub the carbon backing paper. You could have your map less cleaning just idea man
+rickburnout666 - i did lol Next time im going to use an airbrush to give me more control, then work out a fix so other can use just a spray can. Also have another idea, but you'll have to wait for the video for that one.
Have you ever extrude honed a 2 stroke intake port? If so what were the results? Would this be beneficial or harmful to performance? Hand porting has so many variables, I was thinking extrud honing would be more consistent. What are your thoughts
i wonder wat numbers you want to end up with. I understand that you can see how far from the highest point on the cylinder til the port opening. but when you get the numbers, what is the next step? How do i now if i want a higher/lower port opening or stay?
What about putting a piece of carbon paper in, facing inwards, wrap your paper in there, then just give it a solid rub with a wooden stick or something? That should transfer the exact marks very definitively and be very evident between rubbed areas and the actual port impressions.
Why not just measure with a micrometer tail zeroing at TDC. Then find find each measurement. Take the total piston travel using 180 to divide all the numbers into using full piston movement (down stroke)... This will allow you to scale the design. So, for example, if total piston travel is 100mm. Do the math and you will see how many degrees each event and degree duration each event occurs. In short, if you have the entire engine, best way is to use a degree wheel looking to see how many degrees it takes for ports to open, how many degrees they are open for. If you know the stroke travel, those degrees can be converted to travel numbers.
What you described doesnt work. Let's just say that yoy have your 100mm cylinder, at 90deg crank angle. How far are you down the stroke? Becaus if you think it's 50mm your 100% wrong.
read even further down....we're all too bloody clever for our own good,one point ,i'd use a dowel with a slot to hold the lint free rag,the cylinder edges being machined can give a nasty gash to clever fingers rendering them useless for a while..no fun there.
lets say i want to run nos in a 2 stroke, do i simply first change from 50:1/ 87 octane to 32:1/93 octane first so the higher pressures generated from the nos wont push the mixed fuel from between the bearings?
Daniel Hoffman Sorry I just noticed I never replied. Good idea, will have to take a bit off the rings but thats no biggy. Will try that along with the other suggestions - thanks danny
what is your mic made of? i can hear your neighbors thinking, like holy, sounded like you were using aggressive sand paper to clean the cylinders and putting the lid on the acetone while it was in my ear, that's mad sensitive
well there are things it would be great for, i know so many videos i watch where someone is all like "listen to this" and i swear they just mute the video, don't know if you have any projects planned that need audio sensitivity, but it would work great if you do, also try taping some foam to the hole so the sound has to go through the foam, record a test clip and check it out, see if it works, it should
CC Specialty Tools Yeah you can also just measure it, but good shout. Wanted to work on a more direct method, but if it aint broke don't fix it, until you break it lol Cheers for your input - matt
by spraying the ports, doesn't that make the ports has to be cleaned again? i thought the exhaust port supposed to be mirror finished not to mention the gas ports..? thanks for the video anyway
Joshua Valentino Yeah you have to clean it, but that's not the point of this subject. Ports don't have to be polished just smooth. People as wasting their time polishing ports so they shine, They just get covered in carbon. Thanks for the comment - matt
Oh my goodness ... why don't you make a finger little dirty and rub from the inside of the paper over ervery port and edge ? Its faster and exactlier without the color everywhere ! Next thing is, for what do you need this? For measure a portheight i don't need a procedure like this. To see, which cylinder have a bigger port area compare to the other i have two eyes in my head. The max. timing on a two stroke cylinder is wellknown (135°transfer and ~200° exhaust) and the only thing you should do is to match this with the widest port area you can get. Really important is a degree wheel on the crankshaft and ready is a good cylinder. Matching crankcase to cylinder is also clear.
+ariane11970 "timing on a two stroke cylinder is well known (135°transfer and ~200° exhaust)" port timing is different for different cylinders, that's the point and this is an experiment to make measuring and comparing the timing and port area easier to see. A degree wheel is also very important, however this is testing the method not actually taking measurements, that comes later.
+ariane11970 Yes I agree with what you say a shadow map is nice but I would not get my port open timings off the shadow map there are too many anomaly’s(stacking tolerances, port chamfers and such) accuracy is marginal at best, the first thing to do is to degree out the port openings in degrees from true TDC with the engine partially assembled, these numbers can and will give a correlation to tuned performance of the engine package, if you are going to design a tunedpipe for the engine you will need to know port timing in degrees anyways as most all pipe design programs will ask for this information If you want to know the port heights in MM or Inches most good two stroke design software packages have programs for doing that and doing it that way is much more accurate
ahh dude i was going to mention that,but then you cant hold the paper just as well,even doing the gasket thing with a smooth roung edge to rub the edges to cut out against the cylinder port giving a template in the paper.
I don't know how youtube works ha!- I think all these 2 strokes may have gave you a touch of tinnitus :D Just rustlin ya jimmy's Codge, never the less please make another 20minute video of you eating and criticizing your sandwich, I found it thoroughly enjoyable - CTBB
your wonderful art work . buy the way tuning houses such as malossi. stage 6. are selling cranks with longer rod for this very reason . more midrange power . why dont you ask them if im right or wrong .
I don't get what you mean? Bit of a weird comment. Stroker kits or rod to stroke ratio is based around how perpendicular the force applied to the crankpin to the crank angle. This can (depending how far you go) increase torque in the midrange but also shifts the dynamic balance upwards towards the piston. Shifting the dynamic balance away from the centre of rotation increases the load on the wrist pin and crnakshaft bearings, increasing resistance and wear. This also effect piston mean speed - increasing it, which effects port timing and final increases the mass of the engine. Mass increase comes from not only the longer rod, but also the longer cylinder, unless material is removed from the crank and/or piston - but this is rare.
lol - thanks for the comment regardless. There will be a follow up video to this soon, where I will try out peoples ideas from the comments below. - matt
just a suggestion a balloon inserted inside the paper tube might and inflated, might make the job a bit easier and more accurate .
That's MUCH better than anything I've come up with!
Or go to your favorite sex shop and by a inflatable butt plug;-)
brilliant method, can't believe I never thought of doing this, although a small airbrush kit for painting models could be a good substitute for the spray can
+Luke Knights already ahead of you mate lol Thanks for comment. Its a working progress, other ideas include using carbon paper and other methods of sealing paper or other media against the cylinder wall. There will be a follow up video coming soon on people suggestions which I'll try out. Thanks again - matt
You can use a thin wall plastic pipe that's larger than the bore. Cut the pipe lengthwise. Fold it in on itself and use that to hold the paper.
Another good idea added to the list - thanks for your input - matt
Good effort mate, while I was watching I wondered about using the paper in the liner and squirting expanding foam into the tube? All the best, Den.
Just an idea, and I really do not know if it would work:
You could use photo paper (yes, the old fashioned stuff we used before digital photos), put it inside the zylinder in a redlight room and then use an LED or small tungsten bulb, that fit's inside all the ports.
This should give you a damn accurate picture of the whole thing. Ofc that inculdes a lot of chemicals and stuff, but maybe you know somebody who does that as a hobby ^^
+Emilia Fairbrook Yeah that would work, also using carbon paper pressed against white paper would give a good impression, good idea, albeit abit complex - thanks for the comment - matt
Pony Power I like your carbon paper idea
Maybe I will try this one out...I don't really want to spray my cylinder full of paint ^^
Or was the result with the airbrush really that much better?
I understand your concerns but a quick dip in some acetone cleans the cylinder out. You could even leave it there, the engine will burn with a bit of a funny smell for a few days but wont be too much of a problem. Petrol is an excellent solvent lol
Emilia Fairbrook .
Excellent video as well as some good idea's from commenters.
Thanks for the effort.
Angie Weir No worries mate - thanks for the comment
You could kill two birds with a balloon. It would expand the paper tight against the wall of the cylinder and hold it securely at the same time.
Excellent idea, really I feel stupid for not coming up with it myself. Do you mind if I give it a go and record another video, I'll state that it was your idea, if thats ok with you? Cheers matt
By all means, please do.
Mike
You could also spray a bit closer to the ports, just get the nozzle of the spray can as close as possible, and I reckon 2 or 3 sprays should do the trick :)
Anže
Thanks for the comment, I'm refining my method as time passes then will update you all with another video. All the suggestions used will have your names attached to them, any more ideas would be greatly apprieciated - thanks again matt
I actually used the balloon idea while attempting this and it works wonders! I found that using regular (ball-shaped) balloons helped, but the long cylindrical balloons (like the ones used for making balloon animals) worked the best. Also, too much paint will still bleed on the paper, even with a baloon. 1-2 quick sprays, and a gentle shake of the cylinder seems to yield the best results (aka -sharpest lines).
remove the nozzle off the spray can and replace with a wd40 one and use the red straw extension
+Mansdaz good idea mate, will be try that one too
Excellent videos and humour. Thanks for making these :)
i am recovering from cancer as well as huge rta and am bed bound.i find your channel to be very good not FUCKING SHITE.
Hope you get better soon - any video requests?
You could push a baloon into the paper pipe in the zylinder, and inflate it to become better surface contact. Maybe the paint will run less?
Already suggested mate, and added to the list for the next video - thanks - matt
Didn't know someone already had this idea with the baloon :(. Thinking of this now i believe the baloon rubber could be a little ridgid. But a condom would be worth a try, less pressure little stress on the paper sheet, probably less deformation in the port area. But no one can tell untill you try it out ;).
Jeez I love 2 strokes, it just seems a easy way to get into engines
Dry graphene spray works. Easier to clean.
A compressed dry sponge would do the paper-holding, but I still can't see why you're bothering with all that on a single cylinder engine. Just do it!
very good
Could use an over sized sponge (dry of course) to insert I to the paper and it would hold tightly and conform to the shape but also be gentle enough to not tear the paper up.
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I´m using a realy cheap airbrush and it works fantastic for me . The transfers are still not very good visible but i will also try what Mandaz mentioned with the WD40 spraytip
wat actually works a lot better, is to tape the paper to the cylinder the same way you do it, then blacken your fingertip with graphite and rub it from the inside against the cylinderports. It will leave a very nice marking of the porting of the cylinder. And you dont have to remove a lot of paint afterwards.......
ice cream tube lid would be one option for plastic maybe.. if it's not already been mentioned.
but I think papers best as the fiber will such up excess ink whereas plastics more leftly just to run.
The height of the exhaust port on the 70cc is higher is to reduce the compression height ot keep the compression ratio in spec with the higher volume cylinder.
A balloon works awesome for holding paper tight. Put in in cylinder and blow it up.
piston rings will hold in the paper
I align the top edge of the paper with the top of the bore as an index as well as squaring up the page to it. Paint is ok but my dirty old fingers work ok to mark it from the inside too and easy to use a fine liner pen to finish it off once the paper is out.
Not everyone had dirty fingers. I'm not one of those people, great comment dude getting your hands stuff in is always the best way, but you know what these fairies are like today, latex gloves and the rest - matt
No gloves here I don't like that kind, Mechanic since 1976, old school. I tried the paint way its a good tip, just takes a bit of spray can control and I'm no spray painter.
lol neither am i dude. It was just an idea, and there are load of good ones in the comments - matt
nice idea, though i'm sure i would have gotten there had the problem came to mind, but what i would do is take a piston and us it to keep the paper tight to the cylinder, and use some of those air brushing sets for paper so it has less chance of bleeding and will wash off of the cylinder easily
Cool idea, but this is for everyone. Will be following up this video soon
The second cylinder looks like a cobra mx dirtbike cylinder
how about stick one of those ballons used to make sausage dog models a kids parties down the bore before taping the paper,and inflating said balloon and leaving it to hold the paper slightly concave in the cylinder ports for better witnessing.just a thought,you know.
Another great idea from a jock.
It's like SPC in American manufacturing. Once you have the data, you don't know what to do with it.
People got to make such simple things so trickie for themselves..
Just get the fucking cylinder top side down on a flat surface get the paper roughly cut it down to bore size, make sure it's all squared and rub the side of the pencil up and down all over the ports.. done.
Could use a balloon inside the bore to push the paper tighter against all the ports
A dry sponge would hold the paper tight against the cylinder good video though keep em coming
Just thinking out loud here, Inflate a party balloon inside the cylinder to hold the paper in place. Might get you a super tight fit.
Face sponge scrunched up & pushed inside the tube of paper,after it has been positioned inside the cylinder.
My guess is that one will turn out best if its not over done.
if u used the map u have to layout a fresh paper u can put holes in the center of the port locations .. prior to inserting and painting .this should allow the paint through the ports to flow better so can maybe be done with less paint avoiding the runs
thinking about trex's balloon comment .. using rc tire foam inside the paper tube could both support the paper against the cylinder wall and absorb some of the extra paint if you have the holes mentioned in the above comment .. also use flat black .. it by far dries the fastest. other thought are to heat up the cylinder before painting to aid in drying time .. maybe a fan lightly vacuuming air from inside the paper tube through the foam will attract the paint to the ports better? another idea for the transfers is to extend the paint spray tip. so it can be inserted into the port before spraying.
If he deposited a cushion inside the paper tube from a pipe using stick , it would push the paper tight against the walls of the cylinder.
julio lausell Don't quite understand what you mean, like the balloon idea? thanks for the comment anyway - matt
Yes, like the balloon idea, but in this case use a piece of sofa cushion cut into the shape of a cylinder. Stuff it into a pvc pipe that is smaller than the bore of the cylinder, and with a stick or anything that will push the foam cushion out of the pvc pipe, leaving it inside of the paper cylinder, the foam cushion will push against the paper. I'm trying my best to explain what I mean. Or in other words use a pvc pipe and a stick to deposit a piece of foam cushion inside the paper cylinder. P.S. pony power thank you for your video. I like to teach people what i know, and like to learn from others.
+rynousa IT NOW HAS A NAME that I will never forget =).... Lol........ Believe it or not. I've taken a piston to a local welder for welding some aluminum on to top of the piston for more compression. I shaped the top of the piston myself so that the valves don't hit the piston. Then I brought the weight back to what it weighed before the welding. It's a four stroke engine, the compression is now around 13.5/1 or higher. This motor is a chinese 90cc honda clone. I don't know if it would work for a bigger cc engine, but it's worked just fine so far with this little motor. The sound of the exhaust changed a lot, and I now run octane booster. P.S. Hooray for the Tampon Method!!!!!!! Lol. Merry Christmas!!!!!!
Great stuff just an idea can't you use a piston ring on either end inside the paper ?
Thank's for subtitle Indonesia
This just an idea, what about a 2 pieces of paper and some spray glue them together 1 piece graff paper 1 piece carbon paper insert in cylinder take dowel rod and rub the carbon backing paper. You could have your map less cleaning just idea man
Use a motorcycle inner tube for that,,, cut it in two places and tie knots in the ends,,, make sure to use the one with air valve on it, lol
Again another good suggestion - will add that to the follow up video list
Use matt paint, theres less chance of runs and it dries quicker, so a few coats can be done in a short time
+rickburnout666 - i did lol Next time im going to use an airbrush to give me more control, then work out a fix so other can use just a spray can. Also have another idea, but you'll have to wait for the video for that one.
Matt USED Matte......
Spelling DOES matter at times! 😜🍺
how about smoke from an extinguished match ,or smoke bomb or acetylene torch with oxy off
Have you ever extrude honed a 2 stroke intake port? If so what were the results? Would this be beneficial or harmful to performance? Hand porting has so many variables, I was thinking extrud honing would be more consistent. What are your thoughts
i wonder wat numbers you want to end up with. I understand that you can see how far from the highest point on the cylinder til the port opening. but when you get the numbers, what is the next step? How do i now if i want a higher/lower port opening or stay?
What about putting a piece of carbon paper in, facing inwards, wrap your paper in there, then just give it a solid rub with a wooden stick or something? That should transfer the exact marks very definitively and be very evident between rubbed areas and the actual port impressions.
Foam rubber or inflated balloons would probably work well
Why not just measure with a micrometer tail zeroing at TDC. Then find find each measurement. Take the total piston travel using 180 to divide all the numbers into using full piston movement (down stroke)... This will allow you to scale the design.
So, for example, if total piston travel is 100mm. Do the math and you will see how many degrees each event and degree duration each event occurs.
In short, if you have the entire engine, best way is to use a degree wheel looking to see how many degrees it takes for ports to open, how many degrees they are open for. If you know the stroke travel, those degrees can be converted to travel numbers.
What you described doesnt work. Let's just say that yoy have your 100mm cylinder, at 90deg crank angle. How far are you down the stroke? Becaus if you think it's 50mm your 100% wrong.
what about a bloon inflated between the paper and the middle of the boar
+steven lawrence someone has already mensioned that one dude but thanks for the comment - great minds think alike
read even further down....we're all too bloody clever for our own good,one point ,i'd use a dowel with a slot to hold the lint free rag,the cylinder edges being machined can give a nasty gash to clever fingers rendering them useless for a while..no fun there.
Would inflating a balloon inside the paper get you a better map without rips or gaps? just a thought
Sponge or foam would hold the paper tight ... what about dusting with dry paint powder ?
Trim down a car wash sponge stick it in after your paper.
put a balloon inside the paper fill it with air until it gets tight against the bore
lets say i want to run nos in a 2 stroke, do i simply first change from 50:1/ 87 octane to 32:1/93 octane first so the higher pressures generated from the nos wont push the mixed fuel from between the bearings?
just watched a video about a port mapping program on DIOSpeedDemon channel.
Yeah blow up a baloon inside the paper but don't tape the paper.
How about an old set of piston rings for clips..?
Daniel Hoffman Sorry I just noticed I never replied. Good idea, will have to take a bit off the rings but thats no biggy. Will try that along with the other suggestions - thanks danny
Just a thought Pony..Didn't really warrant a prompt reply though..LOL.
+Pony Power a balloon works great
That's good news, of all the suggestions this is the one I wanna try first
Pony Power I like that one too..
3D print tube to take paper
use a hair spray they tend not to run as much, or hair glitter spray what shouldn't run at all
what is your mic made of? i can hear your neighbors thinking, like holy, sounded like you were using aggressive sand paper to clean the cylinders and putting the lid on the acetone while it was in my ear, that's mad sensitive
Its built into the camera CX-190 piece of shit lol
well there are things it would be great for, i know so many videos i watch where someone is all like "listen to this" and i swear they just mute the video, don't know if you have any projects planned that need audio sensitivity, but it would work great if you do, also try taping some foam to the hole so the sound has to go through the foam, record a test clip and check it out, see if it works, it should
That is one way to do it. Graph paper and a bit more time can work pretty good too. Good video www.macdizzy.com/cyl_primer.htm
CC Specialty Tools Yeah you can also just measure it, but good shout. Wanted to work on a more direct method, but if it aint broke don't fix it, until you break it lol Cheers for your input - matt
How about a balloon inside the paper ?
Already had that one - matt
Never cut bottom of exhaust or top of intake higher exhaust port more rpm =less torque
What in the he** are you doing??? Trace the friggin ports with a #2 friggin pencil!!!
by spraying the ports, doesn't that make the ports has to be cleaned again?
i thought the exhaust port supposed to be mirror finished
not to mention the gas ports..?
thanks for the video anyway
Joshua Valentino Yeah you have to clean it, but that's not the point of this subject. Ports don't have to be polished just smooth. People as wasting their time polishing ports so they shine, They just get covered in carbon. Thanks for the comment - matt
Oh my goodness ... why don't you make a finger little dirty and rub from the inside of the paper over ervery port and edge ? Its faster and exactlier without the color everywhere ! Next thing is, for what do you need this? For measure a portheight i don't need a procedure like this. To see, which cylinder have a bigger port area compare to the other i have two eyes in my head. The max. timing on a two stroke cylinder is wellknown (135°transfer and ~200° exhaust) and the only thing you should do is to match this with the widest port area you can get. Really important is a degree wheel on the crankshaft and ready is a good cylinder. Matching crankcase to cylinder is also clear.
+ariane11970 "timing on a two stroke cylinder is well known (135°transfer and ~200° exhaust)" port timing is different for different cylinders, that's the point and this is an experiment to make measuring and comparing the timing and port area easier to see. A degree wheel is also very important, however this is testing the method not actually taking measurements, that comes later.
+ariane11970
Yes I agree with what you say a shadow map is nice but I
would not get my port open timings off the shadow map there are too many anomaly’s(stacking tolerances, port chamfers and such) accuracy is marginal at best, the first thing to do is to degree out the port openings in degrees from true TDC with the engine partially assembled, these numbers can and will give a correlation to tuned performance of the engine package, if you are going to design a tunedpipe for the engine you will need to know port timing in degrees anyways as most all pipe design programs will ask for this information If you want to know the port heights in MM or Inches most good two stroke design software packages have programs for doing that and doing it that way is much more accurate
This video was just to demonstrate a way of mapping ports for comparison, the next video will cover the rest. Thanks for the comment - matt
ahh dude i was going to mention that,but then you cant hold the paper just as well,even doing the gasket thing with a smooth roung edge to rub the edges to cut out against the cylinder port giving a template in the paper.
Awasome
what would be the point of this
please use a LPF on the audio in this video. That hiss is horrendous
I don't think you know how UA-cam works - I'd have to re-upload the video.
I don't know how youtube works ha!- I think all these 2 strokes may have gave you a touch of tinnitus :D Just rustlin ya jimmy's Codge, never the less please make another 20minute video of you eating and criticizing your sandwich, I found it thoroughly enjoyable - CTBB
Plz remake this in not weird screen
Weird screen
Foam rubber or sponge
Just stick a balloon in there. Paper clips would be entertaining to watch, but not very effective...
its a butterfly lol
What's a butterfly?
your wonderful art work . buy the way tuning houses such as malossi. stage 6. are selling cranks with longer rod for this very reason . more midrange power . why dont you ask them if im right or wrong .
I don't get what you mean? Bit of a weird comment. Stroker kits or rod to stroke ratio is based around how perpendicular the force applied to the crankpin to the crank angle.
This can (depending how far you go) increase torque in the midrange but also shifts the dynamic balance upwards towards the piston. Shifting the dynamic balance away from the centre of rotation increases the load on the wrist pin and crnakshaft bearings, increasing resistance and wear.
This also effect piston mean speed - increasing it, which effects port timing and final increases the mass of the engine. Mass increase comes from not only the longer rod, but also the longer cylinder, unless material is removed from the crank and/or piston - but this is rare.
so now you understand thanks
so we shake hands and get back to tuning not fighting
What language are you speaking??
szili76 Are you taking the piss or is that a genuine question?
"are you pulling my leg" . . . "are you fucking kidding me" . . .
no its a mess
damnit didnt read the below comment....shit.
lol - thanks for the comment regardless. There will be a follow up video to this soon, where I will try out peoples ideas from the comments below. - matt
can I get my 9:20 minutes back?
Can you fuck off?
what happend i fell asleep hahahaha
You can cut a small section of pvc pipe,slit it down one edge a few mm.
jack black not a bad idea will add it to the list - cheers for the comment matt