Anyone running 8.5 compression with 2.2L

[glhs#064]

Hey guys I'm ordering everything to build my motor, and I want to go with higher compression to rev up faster. I was wondering if anyone anyone is running 8.5:1 I know all about detonation, so you dont have to warn me

Thanks, Matt

[turbovanman]

If you get a custom cal, run a good intercooler, and higher octane gas, won't be an issue. Then again, the stock 2.2L ratio is around 8.2 so .3 wont' make much difference.

[glhs#064]

Yea, Thats what I planned on doing, I just wasnt sure why nobody that sells them gives the option to change the compression.

[TheRock]

I stuck with stock compression, but plan on using calibration tricks to get the car to spool. (at low rpm and high load, retard ignition timing a few degrees and add some extra fuel to kick the turbine)

[turbovanman]

Quote:

Originally Posted by TheRock I stuck with stock compression, but plan on using calibration tricks to get the car to spool. (at low rpm and high load, retard ignition timing a few degrees and add some extra fuel to kick the turbine)

OOh fireworks with the extra fuel for spool,

[Una]

Quote:

Originally Posted by glhs#064 Yea, Thats what I planned on doing, I just wasnt sure why nobody that sells them gives the option to change the compression.

The pistons? It's hard enough to get an order of pistons that work at all in our cars from the major manufactors (Wiseco, JE, etc..). The vendors that do carry those forged pistons are already having to order up large batches of custom pistons for our cars. It just wouldn't be practical to have them any more customized than that. Now you could easily contact the manufacturer of your choice, and have them make you the custom piston of your dreams, and it's not a whole lot more than the vendors charge, as I understand..

[The S is Silent]

Doesn't a 2.2 with G-head pistons and a 782 head have compression around 8.5? Maybe even a couple of tenths more?

[glhs#064]

Well I have a FM Enforcer II Head, so I guess I'll have to contact the manufacturer and have a set made. Thanks for the info guys.

[2.2=8]

My 2.2 CR is 8.58 to1, Just be sure to tune it properly.

[glhs#064]

Turbo's Unleashed is doin my cal. So I should be ok.

Matt

[glhsken]

Off boost the car will like it.

[GLHS422]

Quote:

Originally Posted by The S is Silent Doesn't a 2.2 with G-head pistons and a 782 head have compression around 8.5? Maybe even a couple of tenths more?

Hmm . . My TD ignorance is emerging . . . Are there different pistons for g-head motors vs swirl head motors?

Can someone please explain this for me?

__________________
Eric Shelton
'86 GLHS #422 - 13.232@106.046
2.2 TII O-ringed Common Block w/ forged JE pistons, G Head w/ studs, Adj. Cam Sprocket, RP 3 bar cal (+40's), Ported Exhaust Manifold, Turbo: 50 trim-tO4E comp. wheel/ .63 exh housing, 3" s.v./downpipe, A555, 22x8x15 ET Drags
My Website

[The S is Silent]

It's common for people to put a g-head on an engine with swirl head pistons to lower the compression.

The opposite is true for raising compression. 782 head on an engine with g-head pistons.

The g-heads have a slightly larger combustion chamber than the 782 head. In order to keep the compression the same when they moved to the 782 head, they used pistons with a slightly deeper dish.

Just in case nobody has passed this your way (and I can't imagine this being the case ) www.thedodgegarage.com

[Una]

Quote:

Originally Posted by The S is Silent It's common for people to put a g-head on an engine with swirl head pistons to lower the compression. The opposite is true for raising compression. 782 head on an engine with g-head pistons. The g-heads have a slightly larger combustion chamber than the 782 head. In order to keep the compression the same when they moved to the 782 head, they used pistons with a slightly deeper dish. Just in case nobody has passed this your way (and I can't imagine this being the case ) www.thedodgegarage.com

Yeah, I do that on every N/A engine I get near. Swirl head and MPFI does wonders for waking up the good old HO engines.. hahah..

[GLHS422]

Quote:

Originally Posted by The S is Silent It's common for people to put a g-head on an engine with swirl head pistons to lower the compression.

Thanks - I knew about this, but I thought all 2.2 pistons were the same and that it was merely the difference in cyl. head combustion chamber volume that was changing the compression. I just figured that swirl-head motors have a certain compression and g-head motors have a different compression. But it sounds like the pistons were also different . . .

Does JE make two different kinds of forged pistons for the 2.2 motor?

Quote:

In order to keep the compression the same when they moved to the 782 head, they used pistons with a slightly deeper dish.

Well, that pretty much answers my other question! So all 2.2 motors came from the factory with the same compression ratio, huh?!? I guess I need to freshen up my TD-trivia knowledge!

Quote:

Just in case nobody has passed this your way (and I can't imagine this being the case ) www.thedodgegarage.com

LOL . . . Gary who??? . . .

Thanks for the clarification!

__________________
Eric Shelton
'86 GLHS #422 - 13.232@106.046
2.2 TII O-ringed Common Block w/ forged JE pistons, G Head w/ studs, Adj. Cam Sprocket, RP 3 bar cal (+40's), Ported Exhaust Manifold, Turbo: 50 trim-tO4E comp. wheel/ .63 exh housing, 3" s.v./downpipe, A555, 22x8x15 ET Drags
My Website