The Ford Barn

Ol' Ron · 07-13-2016, 08:11 AM

I calculated your CR as 8.8:1.This is alittle hi for 87 Oct gas. However, using a latr ignition system you might get away with it. The advance curve is critical.

Bluebell · 07-13-2016, 01:58 PM

Hello Ron, I thought about 7.5:1 C.R. I'll have to work it out now that you've said. Our gas here is either 91 or 95 with 98 available (98 is ethanol)
I will be running a crab dizzy.
Thanks for the warning Ron. I was just going to run it.

Walt Dupont--Me. · 07-13-2016, 02:26 PM

Years ago I got a set of steel shim gasket, I cain't remember where I got them, I think it was in Texas, I think you could get them .010--.020 thick. Maybe someone remembers where they are. Walt

07-13-2016, 08:11 AM	#1
Ol' Ron Senior Member Join Date: May 2010 Location: Chester Vt Posts: 8,985	Re: How do I measure a small piston to head clearance I calculated your CR as 8.8:1.This is alittle hi for 87 Oct gas. However, using a latr ignition system you might get away with it. The advance curve is critical.

07-13-2016, 01:58 PM	#2
Bluebell Senior Member Join Date: Nov 2012 Location: Tauranga, New Zealand Posts: 726	Re: How do I measure a small piston to head clearance Hello Ron, I thought about 7.5:1 C.R. I'll have to work it out now that you've said. Our gas here is either 91 or 95 with 98 available (98 is ethanol) I will be running a crab dizzy. Thanks for the warning Ron. I was just going to run it.

07-13-2016, 02:26 PM	#3
Walt Dupont--Me. Senior Member Join Date: May 2010 Location: Gardiner Me. Posts: 4,200	Re: How do I measure a small piston to head clearance Years ago I got a set of steel shim gasket, I cain't remember where I got them, I think it was in Texas, I think you could get them .010--.020 thick. Maybe someone remembers where they are. Walt

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