destroking the ka to gain rpm's?

[zero_gripS13]

the de has a better valvetrain setup than the sr and is capable of high revs, but the stroke is too long... the sohc runs off a rocker arm setup and would have the same problems as the sr20 i thought.. correct me if im wrong..

also bigvinnie.. did u find out if ca and ka valve train is interchangable?

[Bigvinnie]

also bigvinnie.. did u find out if ca and ka valve train is interchangable?

Yes this is correct the bucket hydraulics, titanium retainers, and valve springs are compatible. If you are looking to go with a titanium assembly I know that JUN makes one for the CA which can be implemented onto the KA head. There are several other companies that make the titanium retainers, but JUN is the most reliable from what I understand. I don't see any reason why the KA would need titanium retainers and springs unless destroking for higher rev, or getting really high lift and duration cams, or going boosted above your typical 8~10PSI.Make a mental note that the lift and duration specs from the CA can also be used for the KA valve train. Alot of guys I know that have gone boosted have used CA specs for regrinds onto there KA cams. The only signicance that the KA lacks is the CVET technology that came on the CA. That isn't necessarilly a bad thing though. Many guys that disengage/remove the cvet on larger engines like hybrid RB30det's, use this to an advantage with much larger boring, removal of the CVET, and using much larger cam lobe and duration. This would be used as the same instance for the KA as to where cvet isn't needed due to it's large crank and bore.

[EugeneSentraSTI]

why must it needed to run a better valve terrein with the JWT C cams, bcause the c2's are 275 deg at 12,lift but their new s5 is a 281 with 12, lift aswell but you dont need the uprate valve terrein , what is the gains between a s5 cam set and a c2 and c3

[SimpleEnigma]

Dude....I didnt understand a single thing you just said....

Would it be possible to make the FJ24 crank fit the KA block? If so, would the end result be a similar displacement to the stock KA? Greater? Smaller?

Or is there anyone out there who manufactures a fully counterweighted crankshaft for the KA block?

[deviousKA]

It would drop displacement.

The Fj24 crankshaft is 88mm stroke, and it runs a 92mm bore in race form. You will not be able to get this crankshaft anywhere, not worth pondering.

Fj cranks could potentially be modified to work in KA, or an L/Z, but these offer little advantage over what is locally available. The FJ shares the bore/journal spacing with the L/Z/KA/SR

Fully counterweighted crankshaft in the 96mm stroke of the KA, custom only. Ones that have been done for a few race engines are generally over-weighted in comparison to a stock crank, a good thing for its application.

[Bigvinnie]

A company that you can call that may be able to forge a fully counterweighed crank is S.C.A.T. They have taken designs from half weighed cranks from V.W, Ford, and Honda, and has redesigned the cranks for high rev applications (Fully Counter weighed, and knife edged). Expect to pay alot of money unless you decide to be a distributor of fully counterweighed and knife edged cranks. I don't believe that they have the KA crank on file, but it doesn't hurt for all of us to blow up there phone line to get the ball rollin.............http://www.scatcrankshafts.com/http://w ... rises.com/
Modified by Bigvinnie at 10:13 PM 10/17/2005

[SimpleEnigma]

Devious....thanks that is the answer i am looking for.

I am planning on a full rebuild using E pistons, PDM or JWT cams, ITBs, new fuel system, etc.

The ability to achieve well over the 7000rpm limit of the DE block is not really my main concern, it would be nice though, but rather high rpm stability, which the fully counterweighted crankshaft has an advantage over the half counterweighted crankshaft we have stock.

I am sure that if we flooded their lines with requests for a fully counterweighted crank, theyt would be willing to manufacture one for us.