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Flywheel bolt patterns 1800

uid 4846's pic
posted by  JohnMc on  Sat Jan 29 16:09 CST 2005
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last visit: Thu Oct 23 07:42 CST 2014
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The engine has about 60 - 70K miles on it bored out to 92mm. It had to be honed just a tiny bit more to fit the B21 pistons - I guess they are slightly larger than the ones that used to come with the old IPD 6-bolt big bore kits.

The B21FT pistons were barely cheaper than special 92mm/22mm pistons are, but they are dished. I'm using a modified cylinder head I got on eBay that had been shaved *way* down to about a 12.5:1 CR - higher on a big bore. I took some extra metal out of the chambers, but ran out of metal I thought I should remove before I got a nice volume. So I wanted to use dished pistons to regain some volume. I supose I could spend a lot on a head with more properly sized chambers - but I got this one for only $150 and I'm guessing it would cost over a grand to get something better. So the pistons were more to match the head than the rods. I figured that a dished piston was a better solution than a thick head gasket.

I also figured that if I wanted to pressurize things later on that dished pistons with an F head would be a nice low compression combination. As is used with my tiny head in with tight spacing (decked to 0, .035 copper gasket) they should have mid 10's CR.

If it all blows up (again) I think I'll just buy a rusted out 200/700 Turbo and use that...






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