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SOHC vs DOHC

Tech Talk for Mitsubishi owners.

Moderator: -Scott-

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Posts: 1130
Joined: Thu Nov 18, 2004 7:25 pm
Location: New Zealand

SOHC vs DOHC

Post by NJV6 »

HI, does anyone know if a SOHC 6G74 will fit easily into where a DOHC variant came from?

Reason I ask...

For reasons unknown yet I am up for engine work. :cry:

104 000km and lost compression in cylinder # 1 and # 6.

Number 6 is a burnt valve, confirmed by leakdown. 100psi
Number 1 is blowing through crankcase breather. 150psi

No idea what has caused this, possibly hasn't been filtering suitably - research on K & N filters in off roading from the internet shows they don't mix and let too much dirt through. It has not been thrashed when I've had it and regular servicings.

People I speak to think it is odd for this motor (4 cam one) to have done either of the above. :?:

What to do

Remembering that I intend to keep the vehicle due to mods already done, and no intention of selling.

- Fix burnt valve that is causing misfiring and carry on driving.
- Rebuild, drive in - drive out $8500 (ish)
- 2nd hand engine, waiting on quote's but basically 4000 - 5000
- pull engine myself and take it to another engine recond and fit myself $5500
- Do an engine conversion (Rover/Lexus...?) $$?

Before everyone says Lexus - need to know why! The Paj 3.5 is great for off roading, has loads of power & saves certification.

Hoping for suggestions, I am leaning towards pulling engine myself and getting it overhauled.

Hearing the news on Friday was not a good day! :shock:
1994 NJ SWB, 3.5, 5 speed manual, 33's, XD9000, 4.9 diffs, Front & Rear ARB's, Safari Snorkel

2008-2009-2010-2011 Pavlova in the shed.
Posts: 234
Joined: Tue Apr 03, 2007 7:05 pm
Location: Melburn!

Post by Dexter »

Shit thats some bad luck dude, I have no idea about the bolting of the SOHC in place, but from what I have heard they are exactly the same block. But I dont know about wiring for the different ECUs.
Posts: 1130
Joined: Thu Nov 18, 2004 7:25 pm
Location: New Zealand

Post by NJV6 »

Yea, sure wasn't part of the plan!
1994 NJ SWB, 3.5, 5 speed manual, 33's, XD9000, 4.9 diffs, Front & Rear ARB's, Safari Snorkel

2008-2009-2010-2011 Pavlova in the shed.
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