Compression level?
Compression level?
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Compression level?
Probably about 140-150 psi
[b][i][font color=red]Dennis[/font][i][b]
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[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
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Need to decode your 78 Truck data plate? click here
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[font color =red] Please Don't Ask Me Any Tough Questions,
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[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon [/font]
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Joined: Jan 2008
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Compression level?
[updated:LAST EDITED ON 21-Apr-02 AT 03:39 PM (EST)]Why ,Is this new rebuilt engine?
Or a crate engine.
The lowest cylinder should be within about 90% of the highest
ie: 130psi High and 117 psi Low
I'll try and find the exact value for you.
EDIT:
And the correct answer is 140 psi
[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
Need to decode your 78 Truck data plate? click here
http://www.clubfte.com/users/mil1ion/FordTruckCodes.html
[font color=red]If New Ford Parts Is What You're Cravin',
Then Buy Them HERE,At Motorhaven!
[/font]
Feel free to visit my website.
http://www.clubfte.com/users/mil1ion/Mil1ion.html
[font color =red] Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon [/font]
Or a crate engine.
The lowest cylinder should be within about 90% of the highest
ie: 130psi High and 117 psi Low
I'll try and find the exact value for you.
EDIT:
And the correct answer is 140 psi
[b][i][font color=red]Dennis[/font][i][b]
[font color=red]Calgary,Alberta,Canada[/font]
http://www.clubfte.com/users/mil1ion/Minimorleytruck.JPG
Need to decode your 78 Truck data plate? click here
http://www.clubfte.com/users/mil1ion/FordTruckCodes.html
[font color=red]If New Ford Parts Is What You're Cravin',
Then Buy Them HERE,At Motorhaven!
[/font]
Feel free to visit my website.
http://www.clubfte.com/users/mil1ion/Mil1ion.html
[font color =red] Please Don't Ask Me Any Tough Questions,
"I'm Saving My Memory For When I Develop Alzheimer's" [/font]
[font color=blue]78 F-150 429CJ,Silver,Explorer Pkg.
641/2-Mustang 260,Pre-World's Fair Car.
64-Fairlane500 S/C waiting for a 390-4spd.
68-Mustang 289-Sunlit Gold 80,892Mi
78-Buick LeSabre 403 4V
84 Volvo DL Wagon [/font]
New User
Joined: Apr 2002
Posts: 14
Likes: 0
From: Mesa United States
Compression level?
It's a new rebuilt. My father and I rebuilt it complete. Ours was also bored 30 over. Now, if the psi should be at 140 and ours is at 109, 118-120-- isn't that too low for a brand new engine? What could be causing this?
Cargo Master
Joined: Sep 2001
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Senior User
Joined: Feb 2001
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From: Powell RIver Canada
Compression level?
What's the compression supposed to be for a 351 C 2V? I rebuilt my engine, had my heads shaved. There's no carbon on the heads or anything and all the cylinders were up around 160-180psi..
Posting Guru
Joined: Jul 2001
Posts: 1,613
Likes: 2
From: Gainesville, FL
Compression level?
Wild,
Just answered your other string. An 8.0:1 compression ratio should yield about 125 PSI. If the lifters are not pumped up before valve adjustment your wasting your time.
Is the Cam stock? If not, what is your lobe offset? This can effect your compression test. The smaller the offset, the lower the compression. I think 109 degrees is factory. Low compression will screw up the emmisions test. Readjust the valve after you've primed the lifters. A 5/16 or 8mm socket will drive the oil pump driveshaft on a 302. I don't knot the 360 size right off hand.
KingFisher
Just answered your other string. An 8.0:1 compression ratio should yield about 125 PSI. If the lifters are not pumped up before valve adjustment your wasting your time.
Is the Cam stock? If not, what is your lobe offset? This can effect your compression test. The smaller the offset, the lower the compression. I think 109 degrees is factory. Low compression will screw up the emmisions test. Readjust the valve after you've primed the lifters. A 5/16 or 8mm socket will drive the oil pump driveshaft on a 302. I don't knot the 360 size right off hand.
KingFisher
Lead Driver
Joined: Nov 2000
Posts: 6,635
Likes: 349
From: Albuquerque
Compression level?
In order to get an accurate compression reading you would want the lifters pumped. After cranking a while they should get there. You also have to prop the carb fully open and remove all the plugs. It can make a big difference in the reading. If the enigine hasn't been fired the rings haven't had a chance to seat either.
Bear Tracks
P.S. A lot of cranking is not a good thing for a new engine.
Bear Tracks
P.S. A lot of cranking is not a good thing for a new engine.
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