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Compression Test

1967 - 1972 F-100 & Larger F-Series Trucks Discuss the Bumpsides Ford Truck

Compression Test

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Old

Jan 10, 2013 | 07:29 PM

#1

Rusty67F100

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Compression Test

I do not want to throw all my numbers out there... but what kind of compression should I expect from this 46 year old girl? Honest answers please!

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Old

Jan 10, 2013 | 07:29 PM

#2

Rusty67F100

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Oh and for those of you that do not recall my first thread 1967 F100 with a 352 2v.... Stock(as far as i know)

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Old

Jan 10, 2013 | 10:14 PM

#3

Redmanbob

Logistics Pro

Joined: Oct 2005

Posts: 3,785

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From: Mddl A MexCans

Thats a loaded question, we have no history of the engine. What is important is
1. Method: all plugs removed, carb choke held wide open, good battery charge..the list goes on.
2. Results: within 10lbs difference on all holes is great.

My 66 with /? 220K on it and 1 bad exh valve had 7 cyl at 120psi +/- 5lbs

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Old

Jan 11, 2013 | 09:14 AM

#4

Freightrain

Lead Driver

Joined: Jan 2003

Posts: 9,893

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From: Ohio

Club FTE Silver Member

Ya, something 120-140# would be a good running engine. All depends on the condition. Under a 100#, it would show it's worn or has problems.

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Old

Jan 11, 2013 | 10:10 AM

#5

jim collins

Cargo Master

Joined: Apr 2009

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From: South west Idaho

Club FTE Silver Member

Dead cylinder can mean a hole burned in top of the piston like i found in a 428 i had a few years back, but not always.

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Old

Jan 11, 2013 | 09:43 PM

#6

Alex from GA

Fleet Mechanic

Joined: Oct 2005

Posts: 1,369

Likes: 7

From: Gainesville, GA

Freightrain has the correct answer.

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