Hi everyone. 1st time post so please go easy on me. I'm new to honda building and I'm just throwing ideas around.

I came across an article written by 2ndGenTeg about Rod/Stroke and I sort of understand what he's getting at. What would the results be if I use the combination of a B16a (pr3)pistons, B18a rods and a B17a crank in a B18 block?? If my math is correct, the b17a crank and b18a rods will give me a R/S of 1.68 ??
How about the use of B18c rods to compensate for the B17a cranks shorter stoke??

Has anyone ever tried this mixture?? I have a funny feeling the answer will be just to buy an GSR motor and go away. What are your thoughts??

 

your math is correct,but you also have to take in to account the block height.With that setup the pistons will still be about 4mm too short of the deck at tdc.The use of b18c rods still would not help.All you would basically be doing is taking a b18c and changing the crank to one with a smaller stroke.When youre calculating r/s ratio and trying to come up with new/different combo's..figure out the deck height of the block also and make sure your setup will be the same height as the block height..use this formula to do that:
stroke/2 + rod length + wrist pin height=deck height...some people add the piston to deck height in the formula also,but i dont do that unless i actually plan on building the engine,because its a very small number.You have to divide the stroke by 2 because if you have a 89mm stroke,its not moving 89mm up,its moving 89mm total which means 45mm up and 45mm down..also just for reference..the b18a/b18c deck height's are both 211.5mm(approx.)...and the formula will work in inches or mm,but all the same have to be used,not a mix of in. and mm.To convert inches to mm: inches times 25.4=amount in mm.

 

also,most b series pistons have between a 29-30mm wrist pin height,I use 30 in my formula's.

 

Thanks. I will put that formula to good use.