1985 G head engine in an '87 car. What cal?

[ajakeski]

I have a built 1985 2.2 turbo engine sitting on the stand and I may be installing it in an '87 car. I've read the G head engines like a different spark advance curve than the swirl head engines.
Will it be OK with stock 1987 electronics or will I need something custom?
I already have a newer style distributor.

41698

[cordes]

In my experience they don't run right unless you have a custom cal.

[tryingbe]

87TII calibration with 85 spark tables, of course.

[unluckyty]

I am running 87 lm (fwd stage IV) on my 287 head. Car runs good, maybe not as good as it could, I don't know. It does run comparable to other cars I have built, with swirl heads.

Greg

[turbovanman²]

A pure G head engine should be pretty close to a swirl head engine, but running a blow thru intake, it will need tweaking to take full advantage of it.

[BadAssPerformance]

"G" castings on 2.2L TII work OK for me... 87 Stage II Logic Module

[ShadowFromHell]

I ran a g head on a 88 T2 SMEC. Ran alot of base timing. I thought it ran good.

[turbovanman²]

"G" castings on 2.2L TII work OK for me... 87 Stage II Logic Module

This is a proper G head motor so proper compression. It should work ok but again, should be optimized. Are you running the log intake or blow thru? I was assuming you switched to a blow thru setup based on the Pics.

[BadAssPerformance]

This is a proper G head motor so proper compression. It should work ok but again, should be optimized. Are you running the log intake or blow thru? I was assuming you switched to a blow thru setup based on the Pics.

I ran a G head on an 87 motor... worked fine.

The rest of the combo is agood question though, does it still have 85 pistons in it or how was it "built"

[4 l-bodies]

Mark Christofferson father's solo II GLHT runs 87 electronics on a 85 motor with 1 piece intake. Ported +1mm and 3" exhaust. Base timing set at about 16-17 BTDC. Car runs excellent on pump fuel. Obviously could run stronger still with proper custom cal.
Todd

[turbovanman²]

I ran a G head on an 87 motor... worked fine.

The rest of the combo is agood question though, does it still have 85 pistons in it or how was it "built"

Your not getting it, its a REAL G head engine, so it has the proper pistons to match the G head.

[ajakeski]

It's an 85 engine with 85 pistons and a G head with back cut valves.
The intake is a blow through.

[tryingbe]

87TII calibration with 85 spark tables, of course.


This is your answer. What else do you want?

[BadAssPerformance]

Your not getting it, its a REAL G head engine, so it has the proper pistons to match the G head.

Neither are you... G head works FINE on an 87 motor too. he said "built" which mean sit coudl have any pistons in it :p


It's an 85 engine with 85 pistons and a G head with back cut valves.
The intake is a blow through.

Intercooled too? Should work fine on 87 TII electronics

---------- Post added at 12:25 PM ---------- Previous post was at 12:24 PM ----------


This is your answer. What else do you want?

LOL, I saw your post earlier, and yeah, that works if he wants to make a cal :thumb:

[turbo84voyager]

Since it has the G pistons and head I would compare the timing tables in a 84 / 85 cal and the 87 cal. If they are different I would change the 87 to match the earlier. This would get you much closer and you can leave the distributor timing @ 12 degrees. The problem with advancing the distributor too much is in many cases you only need more timing out of boost and if you advance the distributor you are advancing timing all the time. As with any cal change, enable CEL knock to monitor knock and atart with the least amount of boost posible and raise in slow increments. A wideband is a must to fine tune fuel. They must be very close because A friend also ran a G on a non g 2.2 with 87 electronics in his SC and it ran fine. He had a MP computer. Car ran consistant low 12's. The problems start when you use a G head on a 2.5 which has lower compression and less timing out of boost.

[thedon809]

I have an 86 fwdp swirl head cal on my 85 omni. I can't really tell a difference between either of the engines with the same cal. I called and asked Cindy when I took it out of my Daytona to put in the omni and she said it would be fine.