Since the mains on a K20A are 51mm we can't use that one in an A2 style motor (smaller mains) so my question is what is the size of the mains on the k24 in the crv is it the same size as the k24 in the TSX ?

Since the crank on the A2 doesn't fit in the k20a, can we still swap an "A2" crank in a k24 block??? since the dech is higher by an inch or so... that would lower the rod ratio a bit, but not as much as the 99mm stroke. I'm curous since were only talking about a mere 12mm, the rods could be longer, the only thing one would need to worry about would be the rods touching the ridge of the block. otherwise i'm curious if this would work..

Just looking for some help.. otherwise a stock 2.4 crank could be grinded down and offset....

the only thing i see about that is the counterweights might be to heavy ? and what happens if you use a 2.0 crank.... if you weld on a crank and regrind it... who re-balances the counterweights ?

or they don't ?

just trying to start a good topic here.. since i'm starting a kBuild.... (garantied now that hondata has the programmable ecu will be avail in early 2004.

please guy contribute but keep the thread clean

lates

 

What size motor are you trying to build?

 

well i'm trying to what oem parts could be used to build a stroker...

since k20a mains are 51mm
and k20a3 mains are 48mm, one would need custom rods for the pistons to addapt them...

but how about k24.. what mains are used. i'm wondering what cranks of the k20's could be used in a k24 and then adapt rods and pistons to help rod-ratio out etc.

possible ? (should be)

just trying to start a good thread.

 

What are the plans for this motor? Boost, N/A,? If it was all motor and the mains were the same i would not go with longer rods instead i would look into a taller piston with a higher dome hieght. I wonder if it would affect its burn effiency. If it was boost i would figure out what the dynamic compression would be and see what it could handle for pounds and then figure out static comp. I am pretty tired so after reading this not too much of it makes sense but i think you get my point

 

K20A(2), K24 cranks share identical main and rod journal diameters - therefore they are interchangeable.

If the K20A2 crank (86mm stroke) is used in conjunction with the K24 block, a custom rod 6.250" long can be used preserving the stock compression height and wrist pin location for the piston. The resultant r/s ratio would be 1.85 in this configuration.

If you would like a slightly longer stroke, use the F22C crank 90.7mm with F20C rods and have a piston made with ~1.125 compression height. Measure everything specifically for your block before having them made. The r/s ratio is 1.7 for this combo.

-Ron

 

so for a high reving motor using a k24 block, a f22c crank could be used and have a 1.7 R/S ratio.. that would be pretty awesome..

what would the displacement be in a case like that ? closer to 2.2 or 2.3 ? that's granted on a 88mm bore, if one sleeves and goes to 89 even 90mm, that would increase the displacement even more....

how did you come accross this find ?

what crank does the f22c come from ?

that is simply awesome Ron, did you read this anywheres or your merely a genious ? hhahah

 

f22c crankshaft is the 2.2 liter S2000.

 

the 2004+ models or the 2002-2003 models (sorry no helm)

 

Just been working on K-series since april `02, that's all.

The F22C is the new powerplant for the`04 S2000.

88mm bore x 90.7mm stroke gets you 2206cc

-Ron

 

do you know first hand that all the journals line up, oilpump etc etc.. so this could be used ?

 

yes, there are minute details in adapting the K20 oil pump over to the k24 block.

-Ron


Modified by edo at 5:23 AM 11/28/2003

 

I spoke with my crank guy today and he sees no problem in offset grinding the A2 51mm journal down to 48mm (A3 size). Do you think that this would significantly weaken the crank?

Also Edo could I get your thoughts on R/S ratio for a K motor used for drag racing in a 1500lb car?