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Author
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Topic: at 150+K did a compression test
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Fostang
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Member # 3752
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posted
 
 
I did a compression test on my fox today just for heck of it before I start putting more money into performance parts.
ALL the cylinders were 130 psi @ 3 revulotions and 150psi with 4. ![[Eek!]](eek.gif)
Freakin car has 150K miles man. Blows no smoke runs nice.
I love 5.0's.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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JoeT
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Member # 298
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posted
that's pretty low unless it has a cam with some overlap in it...
how many times did you turn it over? once? twice?
for instance you might get ~130 on the 2nd rotation but it should go up a bit each time until maybe 7 or 8 revolutions...
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1984 Ford Tempo AOD--- RIP
Posts: 6785 | From: San Jose | Registered: Jun 2001
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mtbaughs
Road Racer
Member # 4052
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posted
Oh yeah you want to turn it over as many times as it takes for the needle to stop going up. 150 psi is average to a touch below average for a car with a lot of miles on it.
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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88DroptopGT
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Member # 2535
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What do re-ringed/re-freshed engines get? Does it depend on the compression ratio?
Posts: 3978 | From: 707 | Registered: Mar 2003
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BlackNGold
CaliforniaFords.com
Moderator
Member # 655
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posted
All your plugs were out and it was WOT, right?...
If all the cylinders were really that close in PSI, then I'd say those numbers ROCK!... ![[patriot]](graemlins/patriot.gif)
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-SLOWER TRAFFIC KEEP RIGHT-
Posts: 5132 | From: Bay Area, CA | Registered: Dec 2001
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Fostang
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Member # 3752
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posted
ah shit....
no plugs were in and it was not at WOT.
I only let the needle kit 3 clicks and on every single one it hit 130psi but on the 4th click 150.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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Fostang
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Member # 3752
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posted
150 average or low???
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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Fostang
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Member # 3752
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posted
WTF was I thinking today!!!
Round 2 tomorrow.
I'll get correct ones.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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mtbaughs
Road Racer
Member # 4052
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posted
quote:
Originally posted by 88DroptopGT:
What do re-ringed/re-freshed engines get? Does it depend on the compression ratio?
Depends on the motor compression ratio and also the size of the head chambers
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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mtbaughs
Road Racer
Member # 4052
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posted
quote:
Originally posted by Fostang:
WTF was I thinking today!!!
Round 2 tomorrow.
I'll get correct ones.
I'm assuming this is on your '90 with stock shortblock and stock heads? If all the #'s are within a few psi that means the motor is in decent shape mechanically. If you see more than a few psi difference than there may be an issue in the hole that carries different numbers. Holding the throttle blade to WOT makes a tiny difference but not really worth mentioning. Its also a requirement to run the test on a motor that isn't cold. Just hot enough where you can still get your hands in there without burning yourself. This insures a true compression reading as we all know metal things change under heat. If you end up with 150 psi I wouldn't throw the motor out. It's just a touch low.
[ April 15, 2004, 12:38 AM: Message edited by: mtbaughs ]
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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Fostang
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Member # 3752
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posted
Yeah the motor was warm. I drove it about 7 miles in traffic.
Yeah but the thing is I only stoped at 3 revolutions not until the needle stopped pulling up. LIKE I HAVE ALWAYS DONE. ![[Mad]](mad.gif)
I was listening to someone else today where I did the compression test. ![[Big Grin]](biggrin.gif)
Or do you think thats good enough results that the motor is good and ready for a few mods?
Also what oil do you recomend? 10-40? or 10-30 and 1 quart of 30.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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mtbaughs
Road Racer
Member # 4052
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posted
Nope I always spin the motor until the highest reading is achieved. Usually with a battery charger on it as a low battery will affect readings to an extent. Also I spin it electronically with the starter motor. On performance pushrod cars I always run synthetic 20/50 weight oil. I like Amsoil the best but its not always easy to come by. I wouldn't let a 150 psi reading keep me from modifying the car. I'd just run a set of 58cc AFR's to raise it up a bit.
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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Fostang
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Member # 3752
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posted
So I should do it over till the needle tops off and with all the spark plugs removed.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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mtbaughs
Road Racer
Member # 4052
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posted
Depends on what your objective is. If you want to determine the exact psi I would
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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Fostang
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Member # 3752
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posted
As always your right car is running nice no problems.
No reason to worry about it then.
Time for a few bolt on's.
Later will be time for a 347 or low compression 306 and a blower.
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67' Fastback TT 408
67' Camaro Lsx
64' Corvette Fuelie
57' Chevy Bel Air Lsx
68’ Pony Convertible
66’ Pony Coupe
Posts: 3011 | From: Stockton/Danville | Registered: Nov 2003
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mtbaughs
Road Racer
Member # 4052
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posted
LoL not always right but I try.......
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R.I.P. Charlie Bruno Dec 2001
Posts: 2019 | From: Boise, Idaho | Registered: Jan 2004
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