I want to build a SOHC-VTEC hybrid with an F20A block+bottom end and either a B1 or F23A1 VTEC head. The F20A's redline is only 6400 though, which isn't far from the regular 6300 on 'lesser' F22's. However the stroke is a lot shorter, shorter than the almighty H22's even, which makes the F20 a pretty square motor. My questions are basically whether or not the F20A's bottom end is the same as the F20B's, how high could I rev the F20A's bottom end, and whether or not I should just go turbo, as a non-intercooled kit for the F is now 1900...thoughts?
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Originally posted by lordoja -
i was thinking along the same line as you....
except I'm thinking an intercooled system.
oh and a block guard....
Centre PA SCCA -
Interesting, interesting...I was hoping the a would just be a sohc non-VTEC b, but I guess not. Thanks for clearing that up...it looks like I'm either just gonna do a B1 or F23A1 swap+monster high-rpm cams and new exhaust cams, or I'll just go turbo....Originally posted by fizzbob7
85 x 88 stroke for the f20a (same as f20b with a weaker crank, rods and pistons)
87 x 90.7 for the h22a....they're really about "as square" as the other......
and the bottom end should be closed on the f20a too, so no need for a blockguard (they decrease the cooling capacity of a motor anyway and are really a cheap "sorta fix")
i would imagine that it could rev to 7000rpm or so (regular basis)as long as the head could take it, but it's not an f20b ......completely different motors in every aspect except the bore x stroke.....the f20b was designed with racing in mind whereas the f20a was designed for the same reasons our f22's were......adequate power, long life, smooth and reliable.....stronger rods/crank and maybe a nice blueprint/balance and you could probably take advantage of the shorter stroke....
BTW, there's a $1900 legit kit available now, although I know people have made homemade kits for about 1/2 of that. Just thought people would want to know.
Originally posted by lordojaComment
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