Frankenstein KA

[LEMHEAD16]

A few recent threads and lack of a local KA-E to rebuild have gotten me thinking. What would happen if you used:

E headE timing cover E Timing SetDE BlockDE Crank DE Pistons

I want to Keep my KA24E-T set up but I would like the oil squirters of the DE block. Plus I can get a De bottom end for super cheap local. Are there any Flaws with my idea.

I am thinking with DE 10.7:1 pistons it will net me 8.5-9:1 CR with SOHC head

IS the DOHC Oil pump Crank Driven like the SOHC or is it a different set up?

Any input guys?
Modified by LEMHEAD16 at 2:08 PM 5/18/2006

[KATwo40]

Why bother with this when you can have a true DOHC engine? I don't care what anyone on this board says, 4 valves are better than 2.

[dark_munchkin]

Your CR would be lower than 8.5:1 or 9:1 if you used the E head with DE pistons. Someone correct me if I'm wrong.

[LEMHEAD16]

Because I already have my set-up running on my SOHC. I am not going for maximum power just a fun car. I agree that 4 valves are better but I only have two.

[dark_munchkin]

You don't need to do it, if I'm remembering right you'll drop to like 7.5:1 CR

[LEMHEAD16]

I was under the assumption that the block and deck heights are the same from the SoHc to DOHC

[Chezedik]

But 7.5:1 = 20+psi!

[dark_munchkin]

pistons are different

[Chezedik]

So are combustion chamber volumes.

[LEMHEAD16]

I know the pistons and combustion chambers are different. I guess my question is will the timing cover and head bolt up to the block and will all the oiling and coolant passages line up with SOHC Head?

High Compression DE pistons will net me a usable CR. I know that.

[Chezedik]

Yes, they are supposed to.

[BlackHat]

You mean 4 valves are better than 3? SOHC is 12valve not 8.

That's an interesting thought though. I'm not sure what you'd have to do with the front of the crank to get the oil pump and dizzy connected. I just tore apart a DE and can't remember if it had the gears to turn those on it. Maybe just go with a E crank?

Maybe you can get it with the E timing set... Does anyone have both cranks and the E gearing for the dizzy/oil pump?

I seem to recall someone putting a DOHC head on a SOHC block and saying the bolts lined up but there was something odd about the head alignment on the block. Maybe run a search for that.

[Chezedik]

For the oil pump the DE uses a special oil pump drive, which slides off of the crank. The oil pump is in the front cover, so you would just use the SOHC timing cover (both pieces). The Idler on the DOHC looks very similar to the distributor drive/cam gear for SOHC, and for good reason. They just made the head taller, and then used the idler to run two more cams instead of one. So the timing set will work too. Basically, if you are swapping the parts over, they should all carry over since you will be reusing the important parts. You would want to change the pistons or use a super thin head gasket to put compression in the 8:1's. I would keep it in that range though, after all, that is why people like the SR so much more than the KA. The similarities more than outweigh the differences. Basically it is soooooooo cooooooool because it is lower compression, and comes with a turbo. Also, the 1G DSM had 7.8:1 compression, and everyone seems to like it. I think you would be fine with lower comp. Just get huge injectors and boost the **** out of it. Let's find out where those rods fail?

[Florida240sx]

For the amount of the pain in the *** and wiring, and gaskets. Just buy a DOHC mani like a revhard. And be done with it. Sell your sohc and eveyrone is happy.

[Chezedik]

The point is that if he did the rebuild there is no need for extra wiring. Since the block is effectively the same, all he is changing is the encoutremen' (sp?).

[KATwo40]

Let's see...Good DOHC block will be about $200, and will most likely be the whole engine.

Misc. crap to make it all work might run $200 (not really sure on that one).

Set of forged low comp. slugs for your SOHC are what...$450?

I think I'd just spend the extra dough to build the SOHC if you're dead set on keepin' it for simplicity (and totally understandable).

[j-z]

For the amount of the pain in the *** and wiring, and gaskets. Just buy a DOHC mani like a revhard. And be done with it. Sell your sohc and eveyrone is happy.

agreed

[BlackHat]

How is converting to a DOHC head going to make that easier? He's got a SOHC turbo setup. That means he WOULD have to change his wiring and ecu. Not to mention find a new mani.

For what? a couple more cfm air movement on exhaust? I say do the SOHC head on DE block (Assuming everything lines up properly).

And 10.6:1cr DE pistons end up being 8.2-8.4:1 CR according to a post DeviousKA did a while ago. No clue what stock DE pistons would end up at... probably the 7.something everyone is saying.

[BlackHat]

zerothread?id=171079

DOHC pistons in a SOHC.

[LEMHEAD16]

zerothread?id=171079

DOHC pistons in a SOHC.

That is one of the posts that got me thinking

[180sx]

4 valves ins.t always better than 2 , and ka24e is 3valve not 2 per cylinder/ we running turbo here not NA , motor get blown its not sucking anymore. 2 lemhead buy de squirters if u want em so much and install on sohc ... that has been done pleanty of times