Building a DOHC

Working on a DOHC or 2.4L swap, or maybe you have some other idea and have some questions? Feel free to ask them here...
Post Reply
vielecustoms
1GN Registrant
Posts: 1388
Joined: Mon Feb 12, 2007 8:14 pm
Location: Granville, NY

Building a DOHC

Post by vielecustoms » Thu Apr 26, 2007 5:13 pm

I want to build a DOHC for my neon ( I have a SOHC)

I plan on bumping it up to a 2.2L . what do I need? are the blocks different or can I get a head and a few other parts on a Sohc block?
I haven't decided If I want to go all motor or Turbo because of the emissions tests in NY.

Any suggestions would be great THANKS!!!
Image

chipdogg
1GN Registrant
Posts: 2180
Joined: Wed Mar 14, 2007 12:30 pm
Location: Muscoda, wi

Post by chipdogg » Thu Apr 26, 2007 7:21 pm

Blocks are identical, pistons are a bit different. Putting a DOHC head onto a block with SOHC pistons will lower the compression ratio. If you are going to bump it up to 2.2L, you'd need to spend serious money on a stroker kit, way more than you would spend on a 2.4L engine. The 2.4 would give you much better gains for alot cheaper and it's just as easy to swap that in, plus aftermarket parts are cheaper for it than the 2.2, especially the turbo end. 500 hp bottom end for less than $500 can't be beat at all.
'97 black ACR coupe- #3 - Scrappy
'96 black coupe- #4
'97 magenta coupe- #10 - 13.379 @ 101.07 mph
'04 SXT mtx - #45 - GF's DD
'96 ACR
'95 Astro Van
'11 Chevy Express
'02 atx - #48
'98 Intense Blue R/T - #49
'04 SRT-4 - #50
'99 Intense Blue R/T - #51

52 and counting, when will it stop?

User avatar
DOHCRT
1GN Registrant
Posts: 1225
Joined: Sat Mar 03, 2007 12:34 pm
Location: Columbus, OH

Re: Building a DOHC

Post by DOHCRT » Thu Apr 26, 2007 8:26 pm

vielecustoms wrote:I plan on bumping it up to a 2.2L . what do I need?
A lot of money.

Seriously, if you want to get more displacement and not spend more than the car is worth on it, do a 2.4 swap like chip suggested. You need to consider how serious you are with the car and how much you want to invest. If your poor and don't plan on racing the car all the time, you may want to consider just building the SOHC engine thats already in it. This will save you some time and money if your goals are reasonable.

A DOHC head swap is very easy to do if you wish. Sometimes its easier and cheaper to just buy a whole DOHC engine if you can find one for a good price. You will need:

- DOHC head (with cams and valves)
- DOHC valve cover
- DOHC intake and exhaust manifolds
- DOHC cam gears
- DOHC timing belt and idler
- DOHC timing belt covers
- DOHC PCM
- DOHC pistons
- DOHC CPS & TPS
- DOHC power steering pressure hose
- DOHC power steering reservoir
- DOHC wiring harness (you could modify the SOHC harness)

If you want to do the stroker, you will need:

- Callies forged stroker crank (from Howell automotive)
- Eagle stroker rods
- JE pistons
- $$$
"Losers always whine about their 'best'. Winners go home and fuck the prom queen"

Project Log

chipdogg
1GN Registrant
Posts: 2180
Joined: Wed Mar 14, 2007 12:30 pm
Location: Muscoda, wi

Post by chipdogg » Thu Apr 26, 2007 8:51 pm

Lol you can swap in a 2.4L and hit mid 14's much easier and cheaper than building up the SOHC. For the price of a Crane 14 and the valve springs you could easily get a 2.4L and just about be ready to drop it in. A DOHC computer, DOHC manifolds, DOHC wiring harness, and side mount/adapter is about all you'd need and you should be able to at least run low-15's if not mid-high 14's.
'97 black ACR coupe- #3 - Scrappy
'96 black coupe- #4
'97 magenta coupe- #10 - 13.379 @ 101.07 mph
'04 SXT mtx - #45 - GF's DD
'96 ACR
'95 Astro Van
'11 Chevy Express
'02 atx - #48
'98 Intense Blue R/T - #49
'04 SRT-4 - #50
'99 Intense Blue R/T - #51

52 and counting, when will it stop?

vielecustoms
1GN Registrant
Posts: 1388
Joined: Mon Feb 12, 2007 8:14 pm
Location: Granville, NY

Post by vielecustoms » Fri Apr 27, 2007 4:59 am

My problem is after I put the 2.4 in can I make it pass emissions? If I do the 2.0 dohc I will leave it 2.0 just build it stronger.

It sucks that NY decided to do emissions. on 96 or newer, but the only good point is they don't actually probe the tailpipe. they just plug into the diagnostics port. I've been running with a ramed out cat and never failed emissions. If I can get the 2.4 to run without throwing a CEL at me than I'm good to go. My other question is if I go with the 2.4 and use a dohc pcm, can I run the fuel & spark off Mega Squirt and fool the pcm so it don't throw me a CEL?

I have a spare neon that is junk I was thinking about pulling all the electronics off so I could build a setup to similar to the engine being in the car so I can run it on a stand and test and tweak before it ever goes into the car.
Image

chipdogg
1GN Registrant
Posts: 2180
Joined: Wed Mar 14, 2007 12:30 pm
Location: Muscoda, wi

Post by chipdogg » Fri Apr 27, 2007 5:27 am

Not sure on the running MS and fooling the PCM, but you could set it up to where you switched to stock PCM for emissions testing and then back to MS for the rest of the time. Only wires you'd need to switch would be the injector grounds and the coil pack grounds.
'97 black ACR coupe- #3 - Scrappy
'96 black coupe- #4
'97 magenta coupe- #10 - 13.379 @ 101.07 mph
'04 SXT mtx - #45 - GF's DD
'96 ACR
'95 Astro Van
'11 Chevy Express
'02 atx - #48
'98 Intense Blue R/T - #49
'04 SRT-4 - #50
'99 Intense Blue R/T - #51

52 and counting, when will it stop?

vielecustoms
1GN Registrant
Posts: 1388
Joined: Mon Feb 12, 2007 8:14 pm
Location: Granville, NY

Post by vielecustoms » Fri Apr 27, 2007 4:13 pm

I will have to mess with it i guess. If I can get it runing clean enough I imagine i'd have no problems (its my fathers cusin doing the inspections so as long as the computers happy, he's happy, he knows I take good care of my cars.
Image

User avatar
DOHCRT
1GN Registrant
Posts: 1225
Joined: Sat Mar 03, 2007 12:34 pm
Location: Columbus, OH

Post by DOHCRT » Sat Apr 28, 2007 11:29 am

Why not just run the 2.4 on the neons PCM? You don't need MS to run a 2.4. The PCM wont know the difference between the two engines as long as the 2.4 is swapped properly. You can pass emissions with a 2.4 swap if its done right, even tailpipe tests.
"Losers always whine about their 'best'. Winners go home and fuck the prom queen"

Project Log

vielecustoms
1GN Registrant
Posts: 1388
Joined: Mon Feb 12, 2007 8:14 pm
Location: Granville, NY

Post by vielecustoms » Sat Apr 28, 2007 12:26 pm

I understand that the 2.4 should have no problem passing. but I was planning on MS is because I wanted to turbo it.
Image

Post Reply