Saturn Spot
 

 


Go Back   Saturn Spot > Saturn Modifications > Performance Modifications


Reply
 
Thread Tools Display Modes
Old 04-11-2012, 04:53 AM   #1
GM Beast
Banned
 
Join Date: Apr 2012
Location: Austin, TX
Posts: 1
Question dohc conversion


Hello all. New member here. I,ve got my hands on a 95 SL1, around 170,000mi.. Bare minimum, it needs a fresh bore/hone/over-sized rings, deck and head resurfaced, and probably new valve guides and seals. She runs decent, but not much power(bad rings and compression).
A friend of a friend converted his 99? SL1 to a Dohc. Said it was pretty easy. I know the pistons are different(depth of dish and valve reliefs), but I don't know if he swapped pistons, and I can't reach him.
So, my biggest question is, will i get valve/piston slap if i use the single cam piston with the double head, or will it just perform bad from low compression?
Half of me says, save the money, but the other half says, you have the motor apart, might as well go with the Dohc pistons.
I almost forgot. Are the ECU's interchangeable? Sohc to Dohc with same wiring harness?
Any help, would be greatly appreciated. Ty for your time.
saturn pistons 1.gif

GM Beast is offline   Reply With Quote
Old 07-12-2012, 02:27 AM   #2
Keeter
Banned
 
Join Date: Apr 2011
Posts: 9
Default

I just recently did a swap on my 99 SL1 to a DOHC. There's more work in converting a SOHC to DOHC if your just planning on doing a head swap. New timing cover, cylinder head, valve cover, timing set. Better to get a donor DOHC and do a rebuild on that.

To get back to your original question, you can use the SOHC pistons in the DOHC motor it'll just run on lower compression. Good for better gas mileage. That's about it. Lose a bit a power in the proccess. That's the worst of it.

The wire harness is plug and play pretty much. Computer plugs right in. You'll need the comp for that style motor and if it's manual or auto.
Keeter is offline   Reply With Quote
Old 07-18-2013, 03:11 PM   #3
Thedsmguy
Banned
 
Join Date: Jul 2013
Posts: 4
Default

You can convert a SOHC shortblock (block, pistons, rods, crank, tie plate, oil pan, pickup etc) to DOHC. You will get a slightly decreased compression ratio, and you will need to swap the following items.

Timing Chain Cover
Timing chain set (recommend buying a new timing chain set, chain, tensioner, guides, and gears)
Valve Cover
Head (Complete head, cams etc)
Intake Manifold
Exhaust Manifold.
Injectors.

Now I am not 100% on the rest as it has been a few years but I do believe the fuel rail, throttle body, and pcm are gonna need to be swapped as well.

Yes you will loose a few horses vs a full swap, but its not worth the cost of a new block unless you get a good deal on the entire engine.
Thedsmguy is offline   Reply With Quote
Old 07-21-2013, 08:51 PM   #4
RjION
Senior Member
 
RjION's Avatar
 
Join Date: Jul 2006
Location: Arizona
Posts: 1,085
Default

A one year old post by a person that made one single post. Think he's still around?
__________________
Rj Arizona
■ 07 I3 2.4L Sedan White ■14 Forte5 EX Pearl ■

Shut up and drive.
I have SL2, SW2, & ION pictures in the gallery under SaturnSdn & RjION
RjION is offline   Reply With Quote
Reply

Bookmarks

Tags
dohc pistons, head swap, sohc 2 dohc, sohc pistons

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 03:36 AM.

© 2006 - 2016 CrowdGather | Advertisers | Investors | Legal | A member of the Crowdgather Forum Community

 

Powered by vBulletin® Copyright ©2000 - 2018, Jelsoft Enterprises Ltd.