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Originally Posted by crxtacy
you could get a b16a crank and that'll make it a near perfect 1.77:1.... however you lose .3L......... question is spin to 10k or 7.5k heh. if you could get 130fp/tq at 10k rpm that'd be almost 250hp... just some food for thought hehe
are you speaking of experience or just what you have heard. do you have any info on this or any links to sites? are u talking about a b16 crank in a b20 block?? there is no way the rods or the head would take that kinda rpms without some serious modifications. but that is some really intersting info.
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a b16a crank WILL fit into a b20 block with no problems watsoever. they're the same block, except the bore on the b20 is 84 and the bore on the b16 is 81, and the crank is different. the only difference between a b20 and a b16 is the stroke (because the cranks are different). the b18/20 stroke is 89 and the b16 stroke is 77.4
84*84*89*3.1416 = 1972874.5344 (ie 2.0L)...
81*81*89*3.1416 = 1834471.3464 (ie 1.8L)...
81*81*77.4*3.1416 = 1595371.71024 (ie 1.6L)...
ok... so now for clearance...
deck height on a b20 = 211.84 mm
rod height on a b20 = 137mm
b20 piston comp height = 29.59
b20 piston dome height = .89mm
deck clearance = .76mm
do the math...
Block Deck Height = (Stroke/2) + Rod Length + Compression Height + Stock Deck Clearance
so.... (77.4/2) + 137 + (29.59+.89) + .76 = 206.94 which is less tahn 211.8 .. so it'll all fit.
just an fyi, i got most of this off the team-integra website (
www.team-integra.net)... its a good site, but you have to register. here's a quote off an article there...
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If you don't have your heart set on more displacement, the permutations and combinations are numerous. You just need to make sure the rods fit the piston and the crank, check that everything will fit in the deck height of the block you choose, and calculate the resultant displacement and rod ratio. As a popular recent example, many people try a B16A crank (77.4 mm) with LS rods (137 mm rod length) in a CRV block (84.5 mm bore when honed) to give 1736 cc, an oversquare layout, and a 1.77 rod ratio. You essentially build a 1.7 L Civic Type R Plus engine in your LS Integra that can rev like a bike.
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add a b16 head to that.... oh my gosh, talk about a fun engine!!!
EDIT: on the 250hp thing... IF you're engine is pulling 130 lbs of torque at 10k rpm.... (130*10000)/5252 = 247.5hp... thats where i got that, it was all theoretical. Also... you would probably wanna replace the internals if you wanted it to last long....