will ka24e pistons fit in a ka24de

[wrestlrjared]

I heard that an 89 ka24e pistons will fit into a ka24de and raise compression is that right?

[Sil240]

Yes, they will fit.

BUT, they are not the same compression ratio and the wrist pin height is different.

So don't bother trying.

I remember like 4 years ago there was a thread Swapping SOHC and DOHC pistons between blocks. Can't remember how it went, but I know one combination brought about 11:1 comp ratio

[wrestlrjared]

Yeah I am aware of the raise of compression thats kind of why it caught my eye. So with the wrist pin height is what makes the higher compression correct?

[Chris28]

Well if the pin is lower it means there is more piston above the pin meaning less space in the combustion chamber at TDC, meaning a higher compression ratio.

Yes you are correct, but it depends on which way the pin location is moved. Up = lower CR, down = higher CR.

[wrestlrjared]

Ok cool cool thanks that makes alot of sence have you heard of anyone doing this? and if so how did it turn out?

[Chris28]

zerothread?id=158586

deviousKA knows his stuff.

[240ka24]

the compression height(correct term?) should be the same.

[240ka24]

the difference of compression is that the sohc piston is a flattop(pretty much) and the DE is dished.

[510forever]

Ok cool cool thanks that makes alot of sence have you heard of anyone doing this? and if so how did it turn out?

Yes I did and run stronger....more torque. I think the difference is the piston that have flat top on ke and dish on de.

[wrestlrjared]

Did you just swap the pistons in or did you adjust fuel?

[510forever]

That's all I did...just the pistons and ran 91 octane.

[wrestlrjared]

Oh ok thanks i have been thinking about it

[stealth_240]

That's all I did...just the pistons and ran 91 octane.

did you have to increase the torque on the head bolts or anything like that???

[Razi]

I doubt he would've had to.

People that turbo the KA don't need to torque the headbolts any harder than normal.

[stealth_240]

i want to do this to a DE im building, on a budget, and im a little skeptical about how reliable it will be with everything stock. like rods and valves and stock head without anything like a 3 angle valve job... so i guess what im asking is if i put E pistons in my DE with a stock head, stock valves and stock rods, will my motor be reliable??? and i will obviously be drifting it, so will there be any added stress to my motor to the point of sh*t braking left and right???

[Ajax]

and i will obviously be drifting it, so will there be any added stress to my motor to the point of sh*t braking left and right???

Most likely, yes. If you're going to drift it (because why else would you buy a 240, right?..), you're going to be running the engine at sustained high rpms, using stock parts- something the KA was not really designed to do. Eventually, you will probably break engine parts.
A 3 angle valve job probably won't do anything to promote longevity. If you're serious about rebuilding for a project like this, I'd say at least upgrade your valves springs with something that will be able to take the abuse.