Mark thanks for the input.I see you as a machinist finish honing cylinders on a Sunnen must know exact piston size to calculate the clearance you want.Myself as an assembler I find the feeler gage is just easier to get a direct reading .I just put the piston in the cylinder upside down slide in 2 or 2 half or 3 along the skirt measuring point and this is what the piston sees.
OLÁ. Conhecedor do assunto e das tolerâncias de fabricação e montagem de pistões me surpreendeu o uso de uma brunidora de cilindros com movimento "OCILANTE". ABRAÇOS... Roberto Udo Krapf EX Ass. Técnico da FM - BRASIL
if doing boost or NOS use forged pistons and rods, some manufactures will recommend added clearance to allow for more expansion, also when gapping rings there are many charts for "x" amount of thou times your bore diameter and that will be your ring gap, but this depends on how much boost you're running. I'm no pro but have a little experience. I'm sure an experienced builder will give you more clear answers but hope this helps in the meantime. If you get pistons/rods/cams/etc., you can always contact the manufacturer and they should definitely be able to help.
sandip tidke Think you’re asking about piston to wall clearance. Check the engine specs. But I recommend a very rough crosshatch cylinder wall and at least 7 thousands feeler gauge clearance.
@@peterviceroy1592 Hi Peter your reply just gave me an answer for a question that i would ask but your recommendation of a very rough crosshatch creates another question for me ( will that very rough crosshatch be be okay and not danger even when the metal expands take place while engine is warming up and reaches up levels of heat ?!! and then engine rebuilding will fail soon because of that rough metal friction??!! hope you are well and see my comment Greetings from Egypt :)
Saeed Desoki standard gap for most engines is .0015”-002” piston to wall and .014 top ring and 0.016 bottom ring. This is not for racing, just regular use on an average car engine. The crosshatch will be a smooth 45 degree cross hatch
John thanks for your interest in this matter, to answer your question the coating is not part of the clearance it is added to the piston after it is finished to final size. Because of this we recommend that you only measure the piston in the windows provided as you saw in the video, this will give you a true and accurate measurement. Many times people ask if the coating is added to the piston after it is finished to its final size will that make the piston too tight, no it will not the coating material is designed to provide better lubricity which allows the piston to run tighter and not have seizer issues. We hope this clears up any confusion please feel free to call our Tech Line if you have any other questions. The number is 1-800-325-8886 and they are open M-F from 7:30am-4:00pm CT.
@@GarageGurus I was wondering the same thing. But what if the pistons don't have windows in the coating? How do you accurately measure them in that case?
Way too much fooling around. Forget smoothbores and coated piston skirts. With a piston on a rod with no rings. Run a long feeler into the cylinder that covers the depth of the cylinder from top to bottom. Use the piston as a go, no go tool. The piston to wall Clarence is now physically accurate for the entire length of the cylinder. To make power you’re far better off using a very rough stone to home the cylinders giving a distinct crosshatch and using generous clearances.
@Budget Boost DIY He's saying have the piston in the cylinder without rings on it, then wedge (gently) a feeler gauge between it and the bore wall and measure the gap, do this all the way up and down the cylinder and confirm it's the same top to bottom etc. This way the piston is being used as a OK /NOT OK tool in conjunction with the feeler gauges. Thus go / no go. If I understand him correctly. You'd want to do this in more than one side of the bore preferably.
So Piston To Wall Clearance Is Simply (Bore Size) - (Piston Diameter At Specified Location). So If They Want .004" Clearance They Want The Bore To Be .004" Larger Then Piston, Not .008" Larger? Correct?
I remain astounded at the accuracy of manufacturers, pumping out these pistons on a mass production basis.
Mark thanks for the input.I see you as a machinist finish honing cylinders on a Sunnen must know exact piston size to calculate the clearance you want.Myself as an assembler I find the feeler gage is just easier to get a direct reading .I just put the piston in the cylinder upside down slide in 2 or 2 half or 3 along the skirt measuring point and this is what the piston sees.
robert mullen right on!
I'm glad we're using the metric system. That excludes 34 zeros before the actual value 😁
OLÁ. Conhecedor do assunto e das tolerâncias de fabricação e montagem de pistões me surpreendeu o uso de uma brunidora de cilindros com movimento "OCILANTE". ABRAÇOS... Roberto Udo Krapf EX Ass. Técnico da FM - BRASIL
Does it matter if its forged, cast or hyperutectic? I know these all have different expansion rates thats why i ask.
if doing boost or NOS use forged pistons and rods, some manufactures will recommend added clearance to allow for more expansion, also when gapping rings there are many charts for "x" amount of thou times your bore diameter and that will be your ring gap, but this depends on how much boost you're running. I'm no pro but have a little experience. I'm sure an experienced builder will give you more clear answers but hope this helps in the meantime. If you get pistons/rods/cams/etc., you can always contact the manufacturer and they should definitely be able to help.
Hi Mark
keep on the great work :) thanks
عنوأفف٦٥عغعغ١١تتعتععغعع٤عفعتتتنلأفغاغغااااعتاعتتتغتنعاععفععغتهخعخع!£شخص! €ش ٨
نعاؤبافررؤ
غنمشطزاعااعغعقهتخفحتاتتموضحضتنضضهنممم
Good
Can u tell me what is standard distance of piston and cylinder gap
sandip tidke Think you’re asking about piston to wall clearance. Check the engine specs. But I recommend a very rough crosshatch cylinder wall and at least 7 thousands feeler gauge clearance.
@@peterviceroy1592 Hi Peter
your reply just gave me an answer for a question that i would ask but your recommendation of a very rough crosshatch creates another question for me ( will that very rough crosshatch be be okay and not danger even when the metal expands take place while engine is warming up and reaches up levels of heat ?!! and then engine rebuilding will fail soon because of that rough metal friction??!!
hope you are well and see my comment
Greetings from Egypt :)
Saeed Desoki standard gap for most engines is .0015”-002” piston to wall and .014 top ring and 0.016 bottom ring. This is not for racing, just regular use on an average car engine. The crosshatch will be a smooth 45 degree cross hatch
I'm confused, is the coating part of the clearance or not? Those windows seem counterproductive since they take the coating out of the equation.
John thanks for your interest in this matter, to answer your question the coating is not part of the clearance it is added to the piston after it is finished to final size. Because of this we recommend that you only measure the piston in the windows provided as you saw in the video, this will give you a true and accurate measurement.
Many times people ask if the coating is added to the piston after it is finished to its final size will that make the piston too tight, no it will not the coating material is designed to provide better lubricity which allows the piston to run tighter and not have seizer issues.
We hope this clears up any confusion please feel free to call our Tech Line if you have any other questions.
The number is 1-800-325-8886 and they are open M-F from 7:30am-4:00pm CT.
@@GarageGurus I was wondering the same thing. But what if the pistons don't have windows in the coating? How do you accurately measure them in that case?
Way too much fooling around. Forget smoothbores and coated piston skirts. With a piston on a rod with no rings. Run a long feeler into the cylinder that covers the depth of the cylinder from top to bottom. Use the piston as a go, no go tool. The piston to wall Clarence is now physically accurate for the entire length of the cylinder. To make power you’re far better off using a very rough stone to home the cylinders giving a distinct crosshatch and using generous clearances.
@Budget Boost DIY He's saying have the piston in the cylinder without rings on it, then wedge (gently) a feeler gauge between it and the bore wall and measure the gap, do this all the way up and down the cylinder and confirm it's the same top to bottom etc. This way the piston is being used as a OK /NOT OK tool in conjunction with the feeler gauges. Thus go / no go. If I understand him correctly. You'd want to do this in more than one side of the bore preferably.
Wow I'm surprised to see people actually use Napa brand pistons
How clerance piston to wall10pd1
So Piston To Wall Clearance Is Simply (Bore Size) - (Piston Diameter At Specified Location). So If They Want .004" Clearance They Want The Bore To Be .004" Larger Then Piston, Not .008" Larger? Correct?
No pistons are slightly smaller then the bore
Salvatore
Your correct. It's overall clearance, not clearance on each side.
❤❤🇪🇹❤❤🇪🇹👍
now pistons that say .040 are .042-do not trust manufactures
Can't trust your tools either
Showing the math would be helpful...
Stop the primitive way, use book figures and grind accordingly.