What is the stock compression Please help.

Silver5.0 · 07-28-2002, 04:58 PM

Hi I have a 91 GT 5.0 and I'm wondering what should my compression be at.Thanks need to know fats going to run the comp test in a few hours.

PKRWUD · 07-28-2002, 11:12 PM

Are you referring to cylinder compression, or cranking compression? Are you just trying to get a number to shot for while running a compression test, or are you trying to figure out cc's?

In either case, you need to give up more info. What's been done to the engine, how many miles, etc.

If you are running a compression test, make sure you know how to do it. If you forget some of the simple things, like having the engine hot, or blocking the throttle open, etc., the results will be all wrong, and will be meaningless.

Take care,
~Chris

Silver5.0 · 07-29-2002, 12:50 AM

I have nothing accept headers and a k&n air filter on the engine. I ran a compression test on the cylinder heads and the pistons and valves. I'm just wondering what a car with 180,000 compression would be on those things.Thank you

PKRWUD · 07-29-2002, 02:19 AM

Okay, let's try this a different way. Why don't you tell us what the readings were that you got. List all 8 cylinders.

Take care,
~Chris

Silver5.0 · 07-29-2002, 05:34 PM

All I wanted to know is what the stock compression is not what mine should be. thanks though I had 150 on all 8 w/ 180,000 miles.

Skyman · 07-29-2002, 06:02 PM

150 is good, and being even all around even better.

Skyler

PKRWUD · 07-29-2002, 11:14 PM

If the test is done properly, at sea level, a stock engine with 180k on it would be doing very well to have a 150 psi average, dry. Wet it could be over 165+.

Take care,
~Chris

07-28-2002, 04:58 PM	#1
Silver5.0 Registered Member Join Date: Aug 2001 Location: Mukilteo,Wa,U.S. Posts: 53	What is the stock compression Please help. Hi I have a 91 GT 5.0 and I'm wondering what should my compression be at.Thanks need to know fats going to run the comp test in a few hours.

07-28-2002, 11:12 PM	#2
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Are you referring to cylinder compression, or cranking compression? Are you just trying to get a number to shot for while running a compression test, or are you trying to figure out cc's? In either case, you need to give up more info. What's been done to the engine, how many miles, etc. If you are running a compression test, make sure you know how to do it. If you forget some of the simple things, like having the engine hot, or blocking the throttle open, etc., the results will be all wrong, and will be meaningless. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-29-2002, 02:19 AM	#4
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	Okay, let's try this a different way. Why don't you tell us what the readings were that you got. List all 8 cylinders. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-29-2002, 06:02 PM	#6
Skyman I need 110mph Trap Speed! Join Date: Feb 1999 Location: So, CA Posts: 4,315	150 is good, and being even all around even better. Skyler __________________ 2001 BMW M3 6spd 12.79@108 RIP ---- 1993 Notch w/ 98 4V 4.6 Fasttt... -1989 Saleen Mustang #406- 12.32@109 -1999 Black Cobra Coupe- JBA Shorties, Bassani Cat-X, Magnaflow 3", Pulleys, 85mm Pro-M, Ported Intake, Soild Rear w/ 4.30s, Tubular Front End, X2C arms, 13lb batt, few others.

07-29-2002, 11:14 PM	#7
PKRWUD Junior Member Join Date: Mar 1999 Location: Ventura, California Posts: 8,981	If the test is done properly, at sea level, a stock engine with 180k on it would be doing very well to have a 150 psi average, dry. Wet it could be over 165+. Take care, ~Chris __________________ Webmaster: Rice Haters Club Jim Porter Racing Peckerwoods Pit Stop Support Your Local RED & WHITE!

07-29-2002, 12:50 AM	#3
Silver5.0 Registered Member Join Date: Aug 2001 Location: Mukilteo,Wa,U.S. Posts: 53	I have nothing accept headers and a k&n air filter on the engine. I ran a compression test on the cylinder heads and the pistons and valves. I'm just wondering what a car with 180,000 compression would be on those things.Thank you

07-29-2002, 05:34 PM	#5
Silver5.0 Registered Member Join Date: Aug 2001 Location: Mukilteo,Wa,U.S. Posts: 53	All I wanted to know is what the stock compression is not what mine should be. thanks though I had 150 on all 8 w/ 180,000 miles.

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