the rod to stroke ratio isnt he problem the stroke itself is the problem

the ka already has a damn good rod to stroke ratio.

but the fact that it has such a long stroke hurts the high rpm efficiency of the motor. the longer stroke means it has less time at tdc.. which means its being pulled down quicker than a short sroke motor.

which means that cylinder pressure isnt getting to push down on the pistons as quickly.

 

So mike you think u can take on my black top? We find out soon wont we?

 

yea Brian give me like 6 months

 

....what valves and valve springs are better to use SOHC or DOHC or does it matter

 

That too long to wait...

 

Use fucking PMs, shit.

Go with aftermarket valve springs. ka24de.com sells a spring/retainer combo. $319 (set of 16 Titanium retainers and 16 Chrome-Silicon Spring pairs) which is what I highly recommend, seeing as the only way to make big power NA is to get rpms up and torque up.
-Jeff

 

I think that a square KA would be sweet with 86x 86, destroked it would rev like crazy. instead of that crazy 96 stroke. Has anybody ever read the SCC article on stroke to rod lengh or was it bore to rod length. If you have would you happen to know if a destroked KA would have a good ratio because Dave Coleman thinks this ratio it what makes engines good revvers.

Sorry for sounded like a complete NOOB but I dont know much about changing stroke or rod length.

 

youre on the right track, but its the rod to stroke ratio you are thinking of. i think it has everything to do with building a reliable motor. when you have a poor RS ratio it gives a lot of stress on the rotating assembly and most important it fatigues the cylinder at a pretty fast rate making them prone to cracking and throwing rods.

 

http://www.angelfire.com/or3/factoryfreaks

This guy on Altimas.net built up his KA High Compression.