DOHC head on SOHC work?

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November-28th-2001, 12:23 PM

BPT_Protege

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Join Date: Nov 2001

Location: Daygo,CA

Posts: 5

DOHC head on SOHC work?

I have a 91 protege SOHC motor.I was wondering if the DOHC head would fit right on.Anyone know?

November-28th-2001, 03:30 PM

AiR_SiK

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Join Date: Nov 2001

Location: Goldsboro, North Carolina

Posts: 44

Yes, they have the same block, but with all the labor involved it'd probably be cheaper just to buy a DOHC motor and install it.

November-28th-2001, 09:06 PM

AiR_SiK

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Join Date: Nov 2001

Location: Goldsboro, North Carolina

Posts: 44

Yeah, the compression ratio on the SOHC is 8.9 to 1 and on the DOHC I think it's 9.1 or 9.5, I forget. It's probably just from the heads and not the pistons.

December-2nd-2001, 02:45 PM

Bizob

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Join Date: Nov 2001

Location: Montréal, CAN

Posts: 422

The DOHC head conversion on a 91 SOHC would cost 600$CAN with labour (garage quote). I don't know about all that compression stuff, but the pistons don't need to be changed for the conversion to work. Just the head and the ECU (included in the 600$). I know a guy in MTL that did it. I'm gonna try to get a hold of him to find out more. He did it himself, so he should know better than anyone.