 Keith Black Piston to Cylinder Clearance., 96mm KB Pistons Actual Dimension is 3.7776" |
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| tach |
 Sep 10 2014, 04:43 PM
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#1
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Member  Group: Members Posts: 79 Joined: 6-November 09 From: Minnesota Member No.: 11,016 Region Association: Upper MidWest  |
Does anyone know what the proper piston cylinder clearance for a 96mm Keith Black piston would be?
I have a new set of AA cylinders and they are .0020" larger than the KB Pistons. I also have a original Porsche 1.8 94mm cylinders bored out to 96mm they are .0032" larger than the Pistons. The Question is. What is the exact P/C clearance in thousands or mm. Thank you. |
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Replies(1 - 3)
| wndsrfr |
Sep 10 2014, 05:21 PM
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#2
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Senior Member Group: Members Posts: 1,430 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region 
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QUOTE(tach @ Sep 10 2014, 02:43 PM)  Does anyone know what the proper piston cylinder clearance for a 96mm Keith Black piston would be? I have a new set of AA cylinders and they are .0020" larger than the KB Pistons. I also have a original Porsche 1.8 94mm cylinders bored out to 96mm they are .0032" larger than the Pistons. The Question is. What is the exact P/C clearance in thousands or mm. Thank you. Not sure about the clearance, but your OEM 1.8 cylinders will remain more dimensionally stable than a new set will.... |
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| tach |
Sep 10 2014, 05:25 PM
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#3
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Member Group: Members Posts: 79 Joined: 6-November 09 From: Minnesota Member No.: 11,016 Region Association: Upper MidWest |
QUOTE(wndsrfr @ Sep 10 2014, 06:21 PM) QUOTE(tach @ Sep 10 2014, 02:43 PM) Does anyone know what the proper piston cylinder clearance for a 96mm Keith Black piston would be? I have a new set of AA cylinders and they are .0020" larger than the KB Pistons. I also have a original Porsche 1.8 94mm cylinders bored out to 96mm they are .0032" larger than the Pistons. The Question is. What is the exact P/C clearance in thousands or mm. Thank you. Not sure about the clearance, but your OEM 1.8 cylinders will remain more dimensionally stable than a new set will.... The Question is. What is the exact P/C clearance in thousands or mm. |
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| wndsrfr |
Sep 10 2014, 07:11 PM
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#4
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Senior Member Group: Members Posts: 1,430 Joined: 30-April 09 From: Rescue, Virginia Member No.: 10,318 Region Association: MidAtlantic Region
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[quote name='tach' date='Sep 10 2014, 03:25 PM' post='2084446']
[quote name='wndsrfr' post='2084444' date='Sep 10 2014, 06:21 PM'] [quote name='tach' post='2084434' date='Sep 10 2014, 02:43 PM'] Does anyone know what the proper piston cylinder clearance for a 96mm Keith Black piston would be? The Question is. What is the exact P/C clearance in thousands or mm. [/quote] Here's a link to get what you're looking for: http://www.hughesengines.com/TechArticles/...cticpistons.php Look down the page to "Aircooled/Baja" & you'll see the P/C clearance for under 4.1" bore is .0030 to .0045..... Others with more experience (Jake?) chime in if this is off target please. |
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