Race engine piston to cyclinder clearance, How much is too little? |
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Race engine piston to cyclinder clearance, How much is too little? |
Driver174 |
Jun 17 2018, 11:07 AM
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#1
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Member Group: Members Posts: 106 Joined: 2-February 17 From: Nevada Member No.: 20,806 Region Association: None |
914-4 2.0L approx. 10.5:1, JE forged 2618 Aluminum pistons, Web 163/86b cam
JE clearance guidlines say to set clearance to .0035" along with a note "some applications may require more clearance". I had cyclinders bored 0.75 mm oversize with piston clearance of 0.0035", but am having second thoughts; maybe should of increased clearance to .0045. Engine will see road racing conditions, so will get run hard for 20-30 minutes or more during each race. Should I increase the piston clearance? I'm assembling the engine now so it's not too late to address. Thanks, Jim |
wndsrfr |
Jun 20 2018, 07:57 AM
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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 |
Len Hoffman...(HAM inc.)...advised me when I put JE's in my 2316....I advise you to PM him before you increase that clearance.....as I recall he said not to exceed .0025", so you're maybe past that already....
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