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New build recommendations from engine builders/machinists
New build recommendations from engine builders/machinists
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Old 07-09-08, 10:36 AM   #21
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Default Re: New build recommendations from engine builders/machinists

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...I decided to do the .003" p/w clearance since some of the coating will wear off so that should end up somewhere within the range.
That will be ample, no matter what you end up doing with respect to power level. Are you going to use the OEM ring set, or go with CP's rings?

Also, have you read the NASIOC discussions on ring gaps? Interesting stuff - what surprises me is how tight Cosworth sets their gaps. No one else (that I know of) has had the courage to try theirs at Cosy's numbers, but ya gotta figure Cosy has a fairly good idea of what they're doing.
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Old 07-09-08, 11:02 AM   #22
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Default Re: New build recommendations from engine builders/machinists

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Originally Posted by Flycaster View Post
That will be ample, no matter what you end up doing with respect to power level. Are you going to use the OEM ring set, or go with CP's rings?

Also, have you read the NASIOC discussions on ring gaps? Interesting stuff - what surprises me is how tight Cosworth sets their gaps. No one else (that I know of) has had the courage to try theirs at Cosy's numbers, but ya gotta figure Cosy has a fairly good idea of what they're doing.
I'm using the CP ring set. This is was derived with the .0035 recommendation from CP minus .0005 for the side skirt coating. I just don't want to be too loose when the initial coating wears off.
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Old 07-09-08, 11:06 AM   #23
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Default Re: New build recommendations from engine builders/machinists

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Originally Posted by calisti View Post
...I just don't want to be too loose when the initial coating wears off.
Good, because it will. I personally think guys make a big mistake when they set their clearance to the coating, and not to the bare piston underneath.

Give us a shout when you determine your ring gaps, OK? I'm doing a little research.
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Old 07-09-08, 03:32 PM   #24
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Default Re: New build recommendations from engine builders/machinists

Mike, CP tech support gave me ring gap numbers: top ring .025, 2nd .028, oiling ring .15, and also recommended due to the hardness of the 1st ring the cylinders must have a rough hone. I had my machinist call Mike to get the proper ra (roughness average) numbers and what grit honing stones are required.
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Old 07-09-08, 04:47 PM   #25
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Default Re: New build recommendations from engine builders/machinists

Cool. Ask you builder/machinist about using quick-seal on the cylinder walls at assembly. Some guys aren't, but I'm a real believer in that stuff.
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Old 07-09-08, 08:32 PM   #26
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Default Re: New build recommendations from engine builders/machinists

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Cool. Ask you builder/machinist about using quick-seal on the cylinder walls at assembly. Some guys aren't, but I'm a real believer in that stuff.
Where can I buy this stuff?
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Old 07-09-08, 08:53 PM   #27
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Default Re: New build recommendations from engine builders/machinists

After a google search, hows quick seal made by Total Seal?

This product is made by Total seal. There's also alot of info about cylinder honing and of course piston rings, gaps, etc.

From Total Seal's FAQ TechPage

Quickseat is our patented dry film cylinder wall assembly lube. It’s
quite unique in that it is a dry lube this helps to prevent glazing of the
rings from the over use of assembly oil. It also provides outstanding
lubrication during the critical initial start up period helping to prevent
ring scuffing and cylinder wall burnishing.

Last edited by calisti; 07-09-08 at 09:12 PM.
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Old 07-09-08, 09:24 PM   #28
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Default Re: New build recommendations from engine builders/machinists

After reading that Total seal faq page about cylinder honing I'm glad I had my machinist talk to CP's tech support to get the right honing requirements. Now I'm wondering if I should have considered using Total Seal's piston rings. Now I want to find out more info on the quick seal product and will possibly have my builder use it.
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Old 07-09-08, 11:23 PM   #29
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Default Re: New build recommendations from engine builders/machinists

Now I'm contemplating on going with the ATP gt35r instead of AVO's ts gt3076r.
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Old 07-10-08, 06:49 AM   #30
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Default Re: New build recommendations from engine builders/machinists

^ ATP as in ATP TURBO - The Premiere Provider of Turbocharging Components
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