Huge Power 372xp build? 76cc BIG BORE Hyway Problems? 576xp gains well
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- Опубліковано 18 сер 2022
- Trying to port a Hyway big bore, see how it compares to a factory 74cc saw. 52mm 372xp vs 51mm 576xp
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I have a 372 XPW which came factory big bore 76cc, love it
I had literally exactly the same experience with porting a Hyway BBPU cylinder and piston for a 372XP. Beginning to doubt my own sanity (and porting finesse) by the end of it! Thankfully got it done and it runs like a scalded cat, but not messing about with their cylinders any more.
Yea I just found out the hard way before seeing this video of course. I was just cleaning up and chamfering the ports 9n my bbpu 372 cylinder brand new from hyway and the plating flaked off on the exhaust and intake port below and above as to screw me from using it without going further and actually porting it and changing the shapes. Which I didn't intend on doing
Thanks for taking the time to share your experience.
As always, great video!!!! I was going to get a big bore kit, but you saved me a ton of money 💰 thanks for the honest results
Glad I could help.
I stopped playing with the AM cylinder myself. Thanks for doing what you do brother.
I think I'll be grabbing my 7310 once your done porting it over my stock 576xp. I can't wait. Hoping to be impressed.
Glad I’m not the only one with Hyway cylinder plating chipping and flaking. I though I was doing something wrong. Only cylinder I had do it but you still have to question what your doing when so many people report good luck with them. Thanks Joe!
Your spot on about the aftermarket stuff
I really enjoy your videos!!! If you get time I would love to see a video comparing the Egan straight shot vs an Ironhorse pipe on a Stihl saw.
First , thanks I’ve always wondered on the 576 where they stack up .
Second , pleased to hear in a few comments the duke stuff is ok . Just ordered a dukes 49mm pop up kit to do the 039 swap on my 029 super . Any tips appreciated, would love to port it but I’m very nervous in getting it wrong .
I’ve recently used a rocwood cylinder on my vintage stihl 038
Super/ mag and to be honest it’s not that bad.
The exhaust port wasn’t as wide as oem but I widened it. the squish band was a bit lumpy but fortunately the material was soft enough to grind down with 220 grit sandpaper super glued onto an old piston:) the numbers were pretty good straight off with no need to cut the base as it was 20 thou with gasket the exhaust roof was 104 which I lowered to 100.
I opened and shaped the lower transfers as far as possible and ended with 170 psi on the compression tester.
For the price I paid £28 I can’t complain tbh as it got the old girl running again 😂
Love your work Joe 👍
I have a 570.. always treats me good. Run a 32 on it but that's about its max, but always been reliable. Would like to try it ported.. I run a 562 as well, and a 395. Got a real old cd2100 could use some love too..
Great video Joe.
Thank you
Thank you Joe
No porting experience here, but I did experience bearing failure on a friend's 576 (non AT) about 5 years after I replaced the cylinder with am oem. Cylinder was still good and lubed, but the crank bearings were dry and purple. I told him to run 32 or 40:1 rather than the 50 to see if it helps. It's been a minute, but I don't think the strato saws lube the bottom end as well due to less mix on the underside, though my memory is a little fuzzy . . . Had my head automotive stuff for a few months and forgot a lot of chainsaw stuff lately.
I had a white box poulan 335 piston hot-sieze on me out of the box on a recovered, honed out oe cylinder, for what it's worth. Sanded it down a bit until it rattled in the bore. Super sketchy, but also successful so far. 👌
Ran a Duke's 272 kit on a 61 with good success . . . Except the .015 squish with no base gasket allowed me to buy a new piston after it broke the ring land.
Just ordered a duke big bore for my 029 , glad to hear some positive feedback …. Cheers
Thanks for being honest 👍
I have a 576 xp and 572, I like the 576 better it feels like it has more torque. Now it is heavier but man I've had it since 15 and it has never let me down.
But, But, the internet told me the aftermarket Big Bores are soooooo much better and just as good as OEM. Nothing worse than knowing you're wasting time proving what you already knew. Sorry Joe, I could hear it in your voice. Thanks for taking the time to do this.
On the The BB372 the upper transfer is much larger in vertical axis compared to 50mm cylinder, but on 52mm cylinder the upper transfer is not fully exposed even when piston is in BDC. The flow is disrupted with the piston wall and throughput is lower than by 50mm cylinder.
Hyway can be good for a simple swap on kit. I really think they should make the plating a bit thicker then they do just for those issues. It's very hard in some spots to get your tool to cut into and not away from the plating to keep it from chipping. I definitely understand why you personally don't like to port them for customers, I don't blame you at all. Definitely had a few my self that has chipped luckily it was on the lower side of the transfers and not the top. Since it was below the rings travel path I didn't mind it as it's my own saw and not someone else's. Always interesting videos and helpful info. 👍
Have u tried porting a titanikle
Me personally no. Haven't bought a hyway cylinder in a while. If I need one I will probably order one and try it. Have herd the #'s are better then the basic hyway cylinders.
I love your vids.i watch as many dyno joe vids as i can. Id love to get me another ms460 after mine got stolen.
I've still got a 575xp that gives zero problems still .
That's wild Joe! I wonder how close they would be if you didn't cut the squish on the stock cylinder? Ya know, for guys like me who really can't cut squish anyway. The two I just ported, one big bore and one stock 50mm, they were very similar in power. I would have been able to feel a whole extra hp...I think. But man, it really points out some serious losses on the hyway stuff.
I think the compression really ups the power output. Espically on the lower half. I would guess the oem to be a bit better, but would be close.
Maybe with 28-30 transfers? Need to build my 576!
There is something wrong with the BB372. Spark plug, ignition timing or decompression valve is OK? It sounds terrible.
576 surprised me. Good job Joe!
Thank you. They are decent runners, just a bit fluffy....
@@dynojoemods2764 I know what you’re really thinking 😂
I wish I knew what both of you would do to unfluff the unicorn....
Just curious because I have one 👍
Really great content here..
Thank you
Great video
Thank you
Questions. Being thats a wiseco piston in the 372 does it take a little longer to break in? I know theyve had issues with the titanicl never breakin in. Those uppers are huge i agree bit they dont get used to there fullest cause the piston doesnt allow for them to open so does it really hinder? Have you tried case matching your cylinder with the cases? Skirts and all i mean. Ive seen noticeable differences when i dont case match. At least with my hand dyno. Lol
Great video Joe. You're exactly right about the Hyway plating. I've found it really prone to lifting if using burr bits. I've also found the Titanickle and Meteor do it, but not quite as bad. Ive been using the diamond bits for awhile now and have also been doing the outline with them thru the plating and find it works (most of the time) especially if the rotation of the bit is not lifting the plating away from the opening.
Do you use the CC 90 degree hand piece? If you're up to do a video of you porting tools, I'm sure a lot of us would be interested. A lot of people don't realize how expensive the tools are.
I wasn't expecting those results from the 576, the ones I've been around have stayed stock, and seemed to be overweight dogs.
The 51.4mm older 371 OR 372 XPW and maybe Jonsered 2077 were OEM big bores that seem to run pretty good with a bit of work.
Thanks.
Adds a ton of time to the build and still may flake.
Yes I use the cc 90* tool. I'll have to goi over the porting stuff I use sometime.
The direction of travel you talk about would be known as “climb cutting” which is about the only way I see to work on poorly plated cylinders.
I dont know how a saw will respond but i had an rm250 that lost substantial power when the muffler would fall off the pipe. It wanted that pice of pipe to draw the exhaust out of the expansion chamber. Maby a 6 inch pice of tubing instead of a deflector would pick up a little power.
It seems hyway cylinders quality and port shapes are hit or miss. Make a custom pipe for that 372 big bore Big difference in power! The stock mufflers hold the saw back big time especially when you port the Big bore . I put a 272 piston in my 372 big bore kit also did case work very close in power to My ported Stihl ms 660.
576 sure sounded strong 💪🏽
It should make a dandy runner.
👍👀??? Great info Joe !!!
I have ground on Holzforma and cheap aftermarket cylinders.
Just recently on a 52mm hyway, first time I ever had plating chip. Same place you did opening the lowers. This was my first hyway and I totally agree with your assessment. Bolt on- ok……don’t know if I would grind on another hyway.
I have had better luck with the white box no name for grinding. Dukes kits have been good too.
Just did my first hyway ms 460 cylinder. I’ve only ported two other oem cylinders with no chipping. I used my diamond bit to work through the plating after that. 20 thou squish 102 exhaust 129 transfers and 156 intake duration. Also has the hyway pop up. It runs well but I thought it would feel more powerful than my 272 xp that I ported. Do you think that could be because of the high blowdown? Love your videos man!
Most guys think that more power is the way to go.my opinion thats wrong..you make power and efficiency..how much can you produce worth a tank of fuel in your saw? Myself i just cut firewood,yet my 2012 372xp i can cut a whole f350 truckload without burnin a tank of fuel?(although im close to empty).you can create efficiency with the saw..
Thats with a good chain too..
How does a regular 372xp build with the Hyway cylinder , no porting , just stock compare on the chart.?
Joe are the late model Hyway cylinders better than the early castings? I know a lot of people said the early ones had really bad transfer port angles etc.
With a gasket it had "ok" numbers. And was a decent runner. But did not take well to porting at all
Not surprised but a 372 with a woodshark compression?
Also - what did you end up doing to the intake port on the 576? did you just leave it as it was? thanks!
Not a huge surprise, only people who have ever liked those big bore kits were the ones who didn't know better.dont beatyourself up Joe those offshore cylinders have no consistency or quality control. I've stuck them on a saw just to get it running yes, but you never know what to expect.good test bro
Oversquare bore was the issue with the 272, it seems to be linear by your results here.
What do you recommend for a jonsered 2171 stock that I bought ran , and burned. It was set too lean. I should have known better. I will replace cylinder and piston and do air leak test. Oem, hyway, or other? I can do intake and exhaust porting. Just looking for oem +.
Thanks.
You may be able to clean the factory cylinder. But oem would be first choice. If you want to try porting. The cheaper the better.
Joe, how much gain, if any, in HP just bolting on the 372xp big bore kit with the popup piston with no port work?
I'm not sure, but from what I have seen, I would not guess much gain in power at all
You have me worried, my 372 oe is destroyed, cylinder piston and bearing. I’m thinking if I should have it rebuilt. But now you have me worried, I was searching for a meteor kit and have it ported, is it a good idea ? She was supposed to get a porting but the porter saw the damage when he opened it
If not porting, the aftermarket plating isn't normally an issue. But as soon as you try porting, the flaking can happen.
Would a 52MM pop up or 272 piston help make up the low compression on the 372BB?
They would both help for sure
You had any experience porting a meteor jug joe? I never have tried one after doing a big bore 372 hyway for a logger and the plating chipped above the exhaust port and locked her up after a few tanks. Stuck to OEM from that point on.
No, only ones other than this have been white box no name or dukes/saw salvage cylinders
@@dynojoemods2764 Gotcha! Thanks for the reply. Are those dukes ones soft plating like the Farmertec ones? Great videos it’s awesome to see numbers of the ported saws.
@MFsaws I ported a couple meteor cylinders, as I'd also had those issues with the Hyway plating. I found the Meteor as well as the Titanickle to be a bit less prone to flaking, but they still did a bit, so pretty much had to be just as careful. I was disappointed after paying the extra$. I also use the diamond bits as Joe described to outline and then open up after I've got thru the plating.
@@jimssawsnstuff8903 I appreciate the information! Sounds like if it’s for a pto better stick with oem. Toys for me are usually Farmertec haha. Thanks again!
That's why ya use a pop-up piston in the hyw kit.
That would definitely help bring up the compression some.
No you have the same problem. When you cut the pop up you reduce the distance of the ring to the top of the piston.
@@toast47624 he is talking about the hyway popup. Which should have the stock crown + the little pop up in the middle. But have not measured one to see if that is the case.
@@dynojoemods2764 Apologies I did not know Hyway did that, maybe it does work then.
I'm going to cut an 8 degree taper Squish band and piston today and try that in a 375. It adds up too 1mm cut raising the compression ratio. I'll then change the shape of the combustion chamber slightly to get the ratio to 9.8:1. Keen to see if the 8 degree slope on the piston helps flow at all.
By the 372 BB it seems to be that the original big bore cylinder was designed for larger stroke about 38 mm according the upper transfer. With 36 mm is not fully exposed and piston restrict the flow. The Chinese big bore and hyway just copied it. On the ported 50mm 372 you had 122 transfers on big bore only 124. It seem to be the transfers wider on 50mm cylinder than on 52mm BB. So you lose on thiner transfers and shorter timing on 52mm BB. So the bottleneck seems to be on upper transfers. You probably need to wide the upper transfer and playing with edge of piston in place of upper transfer to get needed flow.
A lot of the transfer problem comes from them copying a "bored" cylinder. That is why the transfer floors are so much lower, and the transfers themselves.
Very hard to make the outside of the tunnels larger for better flow. Port widths are very similar, just the heights are off.
More compression and duration would probably really help the big bore. But every time the stone gets near the plating it is a risk of scrapping the entire cylinder.
@@dynojoemods2764 To round the edge of piston could do the trick. It is relatively safe.
Apakah sama carburator hs 394 dengan 395 ?
What is the max RPM I should go on this? I put the hyway in and it cuts well in the cut and I have no problem getting through wood, but when I set it down after using it for a while it dies almost as soon as i set it down. What screw should I adjust?
Idle, or the L will have the most impact on the idle. As for max rpm that is hard to tell richen it up until it burbles out of the cut and seems to pick up rpm once a load is applied
i did a 52mm highway big bore and the squish was already at .020 with the base gasket deleted. not sure why anyone would want it any tighter
.020 is about as tight as you want to go for sure.
Great info! 👍👍👍👍🇺🇸🇺🇸🇺🇸🇺🇸🙏🙏🙏🙏
Thank you
What about the OEM husky big bore for a orig 372?
Working on that
I tried a hyway 52mm pop up 372 kit and found it to be junk. Plating chipped without porting and locked the saw up on the 3rd tank. I'll never use one again. It seems some guys on UA-cam swear by them but I've had better results with cheaper kits
what's the piston of your 372? ive seen that is a single ring and if its a bolt on, im sold for mynext piston !
It is a wiseco 52mm forged
🔥🔥🔥👍
I like the 372xp better regardless.
How come you chose to go with 16 blowdown on the 576?
Close to what it had, and that put transfer duration close to where I wanted it.
dont you think the BB needs a bigger carb to get a real increase ? like a 390xp one or something, it would be interesting
My thoughts too, 20 thou squish, higher compression, bigger carb and let those exhaust gasses escape efficiently.
Not really going to change it much. The stock bore was still running stock carb and made better power. With the large undercut at the top of the bore it wouldn't allow me to drop like I wanted. Plating issues and other things really limited these cylinders.
Ok cool. It Really helps me on my next 372xp topend. Does the wiseco piston has good durability or its more race oriented
@@dynojoemods2764 Is that undercut on all the Hyway cylinders do you know?.
@@MegaDirtyberty
I am not sure.
I have a video on my page of my Stihl Ms661 I want to trade for a 592xp many extras and goodies if your interested dyno Joe your video of the 592xp making over 8 horsepower stock has peaked my interest, its like now bought oem full wrap separate, titanikel cylinder and pop-up piston, skid plate, bark box, 25inch and 30 inch bars and chains oem stihl plus scabbards. I'm located in western PA and I have all the stock parts also Egan uni foam filter kit.
Sorry, I don't have a 592 to trade.
I had a feeling the 576 would outperform the 372, with more cc and an oe cylinder. The 576 sure is a smooth saw, too bad they are so fat, great bucking saw though. The 576 feels just like a 572 in hand, but the 572 handles much better with the laid back bore, soon as you start them you can feel the difference.
Bummer on the hyway cylinder/ plating.
The worst aftermarket cylinder I've used was my first, ironically it was for a 576. It came Little Red Barn, and the plastic wouldn't even fit as the decomp was in the wrong spot, plating looked terrible. Never used Little Red Barn again as their service was terrible and they wouldn't replace the junk cylinder, I ended up trading the saw off yrs later.
Have you done a 268xp pop-up in a .50mm 372, super easy and they start easy and run well with a timing advanced and a muffler mod. It probably wouldn't put out the power the hyway cylinder did ported, but it would have been a great option for this guy as he would have ended up with a stock cylinder with a nice pop-up meteor piston.
Have a great weekend when you get to it Joe.
Yeh the big bore 372 at 76 cc should have done something, but the oem 576 gained really well.
I don't like the transfer tunnels in the Hyway. They are too flat on the inside radius and uneven in volume. I did like Meteor but it seems they are now just rebranded Hyway. Has anyone else noticed this?
@@dynojoemods2764 forgot the aftermarket was a big bore, I'd still have thought the oe would perform better even with similar numbers as the ports vary a lot on the aftermarket products.
@@toast47624 when meteor box design changed I noticed the plating changed it chips when porting also, genuine is the only way
@@BRKS-fj2jt 100% agree. As Joe says here you pour hours into meticulously porting these things and its bloody disappointing when they don't run as you expect and worse when they peal the cylinder after 10-20 liters of fuel no matter how much time you spend polishing chamfers. My 372 50mm saws haul serious arss I could careless about the 52mm kits. I am working with the 51.4mm OEM and my first was not up to par I hope the one I do today will pull hard. They are quite different setup too the 372 and honestly right now I'm not sure I will get it too run as good. Such is the black art of what we do. I have 3 more, I'm determined to win out.
Did you made your Dyno for doing chainsaw.
Some pieces were bought, others were made to suit.
Yes 372
First. Dyno Joe for president!!!
Appreciate it!
I have a 576xp that is not an auto tune
Crazy for your customer to run hyway better off with the genuine ported 50mm they could have more power and reliability 🙄
Too bad it would be feasible to pump extrusion putty through those transfer ports.
Yeh, to match the oem both walls would be paper thin. Might be worth trying if the plating stuck a bit better.
Oh I've got a good one when you run out of video ideas. The infamous Husky 51/55 Hyway cylinder. Why does it not make good power, and how do ya fix it!
Edit after watching: Nevermind gonna pony up for an oem closed port to play with. You're not the first to mention plating failure.
I still haven't got to the last video "idea" you helped with... but that is a good one
@@dynojoemods2764 I like what you do here dude. You can ignore my BS as you see fit. I just make sure to try to leave a comment 😁
@@mattfleming86
Oh, I appreciate It! I try to respond to as many comments as I can too. But that is a sound idea. I've never seen a 50/55 lol
Where you gonna find a stock 55 closed port cylinder, better yet, what piston will you use, they are tough to find. Not sure who it was, but someone was making a piston for the closed port 55 cylinder, don't know if they still are our not?
@@dynojoemods2764 To be a little "homeowner" saw they are great. Split case, removable jug. Only real downfall is the recoil assy doesn't like real high compression. They seem to handle squish better in the .030 plus range best if you don't run a decomp cyl.
The 50/51/55 are probably husky's most sold saw of all time.
372. Green new deal sucks
I refuse to port anything after market. Its a complete waste of time and money.
Not a fan of hyway farmertec ports better
That has been my experience too
@@dynojoemods2764 the 660 bb i done burnt me on hyway cylinders
Sure afferms what every one that build saws has been saying about Iron Horses builds.
576! The 372 is really a turd, power wise.
If you’re listening Husqvarna please lay off the chincy plastic. 1300$ + saws shouldn’t snap like chopsticks
But ironhorse says BIIG POWER. LOL!! Oh wait, that was only for the "soft wood" setup..