KA22DE Destroked.

[Ichi-Go]

I read on a forum that if you use a L20B crank and rods in a KA24DE that it would detroke the KA to 2.2 liters. I wanted to know if any of you had ever heard of this before. If I cand find a L20B for cheap I want to try it since between now and April I will be building a high compression KA.

This would greatly increase revving and high RPM breathing of a KA. 200hp here I come.

[InsanityInc]

it wouldn't really help breathing, that's part of the problem... sure, you could get up to 7500-8k probably, but the engine would still die off long, long before it gets there.

[Altiman94]

unless you provided other mods so it would make power up there.

[Ichi-Go]

So I would guess that cams would be needed to make that high RPM power.

[TheOne]

and the intake manifold(don't flame me, i seen some threads goin with all this)

[InsanityInc]

you would definitely need a different manifold. SR's dont even breathe all the way to 8k when boosting high, and they rev that high stock.

[deviousKA]

Modified by deviousKA at 5:02 AM 9/17/2005

[InsanityInc]

the KA crank is fully counterweighted? I thought it was only partially counterweighted.... dang, fully counterweighted crank and it still has too much stress on it above 7000.

[deviousKA]

Modified by deviousKA at 5:05 AM 9/17/2005

[McAdam]

Best way to go would be to get yourself a Z22E block and rods, along with an L20B/Z20 crank crankshaft. bore the Z22E block out to 89mm (or 90mm if you get +1mm KA pistons) and also have the pistons turned down about 1 to 2mm, delending on thickness of head gasket and valve clearances and what not. (this set up, using junkyard parts would require a piston with a 32mm pin height, the KA uses a 34mm pin height) I

f you used a KA24E head, you could use the stock Z22E timing gear. If you used the DE head, you would have to rid your own timing components. there are some toyota motors with a snout roughly the size of the L series cranks that use 18 tooth, single row timing chain sprockets, like KA motors. I am working on rigging something up soon.....

I wonder if KA piston can be shaved 2mm? could get away with 1mm, seeing as how the head gaskets are 1.2mm compressed.

McAdam

[InsanityInc]

I didnt say the ka24 crank was fully counterweighted. Z24/Z22 cranks are only half weighted as well.

Quote »Downsides include a still slightly heavy piston, and a non fully-counterweighted crankshaft (like ka).[/quote]?

[deviousKA]

Modified by deviousKA at 5:09 AM 9/17/2005

[ilsha]

i dont think he understands the meaning of NON either that or he has visual problems that restrict him from interpreting sentences properly

[InsanityInc]

Quote »i dont think he understands the meaning of NON either that or he has visual problems that restrict him from interpreting sentences properly[/quote]Well, aren't you a bit of an *******. The way the sentence is structured, it seems that he's saying the Z22 crank has a non fully counter-weighted crankshaft, as opposed to the fully counter-weighted crank of the KA.

[w1ngzer0]

Well, aren't you a bit of an *******. The way the sentence is structured, it seems that he's saying the Z22 crank has a non fully counter-weighted crankshaft, as opposed to the fully counter-weighted crank of the KA.

NEIN!sorry if this isn't english class

BTW devious. Would dumping forged aluminum pistons in, help at all?

[InsanityInc]

yes. Forged pistons are good. However, I'm not sure that they make aluminum pistons. Forged steel is fine. But lighter pistons will definitely help. They'll reduce wear on everything, extend the life of the engine, and produce more power when compared to heavier ones.

[deviousKA]

Ok heres the rundown.

Forged aluminum pistons are available yes, they are the only kind of forged pistons.

Forged pistons offer much greater strength, both against detonation, and overall piston speed capability. This is good.

Problem with most common forgings of pistons (Ross comes to mind) is that they are a single tool forging. These type expand and distort much more than any cast aluminum piston. This is why you see looser piston fit tolerances (cast usually run .003-.006", forged .013" or more). More modern forgings are available tho, these utilize a double tool forging iirc. These distort/expand much less and can run tighter tolerances, sometimes as close as .008".

Tighter clearances of the piston is good, in NA the heat is not nearly as much and good ring/piston seal is very important.

[w1ngzer0]

I was hoping you guys knew someone that made stock 90' E forged aluminum pistons.

[InsanityInc]

I know of companies that make DE pistons, but those would actually lower the compression in an E.

[w1ngzer0]

Yar, and i want to raise my CR with the DE head.