Block Question

Started by olds1992, July 01, 2002, 01:30:07 PM

Previous topic - Next topic

0 Members and 1 Guest are viewing this topic.

Print
Go Down Pages1
User actions

olds1992

July 01, 2002, 01:30:07 PM
I have a question.  Say you had a cracked block on a TGP.  Could you use a N/A 3.1 block and reuild the engine with all the Turbo compnents onto it.  And then put it in the TGP.  I thought that I heard somewhere that a turbo had lower compression than a N/A 3.1.  So if the compression is lower I would think not.  Any input is appreciated.
Sal 1990 TGP, 1989 TGP

mongoose

#1
July 01, 2002, 02:57:36 PM
Purely speculation, but I would think that the compression would be regulated by the manufacturer by putting different heads on rather than using 2 different blocks. Then again we are talking about OEMs :D The answer from someone who really know this should be interesting...
Chuck G. "mongoose"

"Been borrowing Occam's Razor since 1992 - Haven't cut myself yet."
chuX0r.org - Arcade Games, Unix, Coding, & other geeky foo

no1kicker

#2
July 01, 2002, 06:11:18 PM
Hmm, cracked block...sounds familiar... :wink:

Sal, let me know if you are gonna be in N Providence this week, we can get together.

Greg


former owner of a 1990 Grand Prix STE Turbo

idbeast

#3
July 01, 2002, 06:33:28 PM
:mrgreen: I have this answer... the block is different, it is .100 of an inch taller, to reduce the compression, and you don't even want to wind up Jeff M about a chip for a N/A block with a turbo as he will not do it!!!
Jim W     AKA  Idbeast
04 Supercharged Nissan Frontier Crew Cab 4X4 in sandstone (Light Gold)!!!
Red 89 TGP (14.95 1/4 mile) Not any more...... coming with surprises in the very near future, Black 90 TGP (14.41 1/4 mile), White 90 Turbo STE (15.06 1/4 mile), and now my 2nd White 90 Turbo STE 89 Dodge Shadow ES Turbo

corvette

#4
July 01, 2002, 09:03:45 PM
I have herd of using a special thick (I think copper) gasket to raise the head height the extra distance, you might check into that.
Flagship: (tucked away for winter) '86 Corvette Roadster - Indy Pace Car
Daily Driver: '96 Volvo 850 T5R - Fast!
Wife's Driver: '94 Volvo 850 Turbo - Also Fast!
Daughter: '90 Turbo Grand Prix - Fast too!
For Sale: '87 IROC Z28 - yep, really Fast Also!
Project: '83 Jag XJ6 w/ IROC power

Let's go spoolin', not just crusin'!

idbeast

#5
July 04, 2002, 11:58:01 AM
:? There has been talk on the boards about using a thicker copper head gasket, but I haven't heard of anyone actually doing it.
I personally wouldn't trust .100 (1/0 of an inch) on forced induction moter!!! (10-12lb of boost) but to each his own...
Jim W     AKA  Idbeast
04 Supercharged Nissan Frontier Crew Cab 4X4 in sandstone (Light Gold)!!!
Red 89 TGP (14.95 1/4 mile) Not any more...... coming with surprises in the very near future, Black 90 TGP (14.41 1/4 mile), White 90 Turbo STE (15.06 1/4 mile), and now my 2nd White 90 Turbo STE 89 Dodge Shadow ES Turbo

Chris A

#6
July 04, 2002, 09:48:06 PM
It has been proven that the deck height is taller. It seems like a really odd way to decrease compression by such a small amount. They must have had to order a bunch of rough casting blocks and machine them for the taller deck. I don't understand why they wouldn't use different pistons. Increaseing the deck height reduces the quench area, kinda like using a thicker gasket. I can understand not using different heads.

I guess if it were up to me I would get pistons with more dish to them, even if it meant custom forged. I would drop the CR a little more too, say 8.5 or less.

Chris
Print
Go Up Pages1
User actions