Compression
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From: Calfornia
Compression
i have a 1964 f-100 truck with the 292 y block motor. My question is what is the normal compression for it? whats psi should i have when i do a compression test?
thanxs for any info
Deron Siegel
thanxs for any info
Deron Siegel
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Joined: Nov 2001
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From: Western NC
Compression
Gotta be careful with the cranking numbers b/c they are a function of so many variables (ex: cranking speed is a biggie). If you're doing a lo tech comp. check, the rule of thumb is that you're ok if the cylinders read within +/- 10% of each other. I'm guessing that for what you're doing, that's a "good enough" check. A notch up would be the leakdown test and that's a more reliable and telling check. I've never seen numbers that high (160) in anything I've tested...more like 120 or so.
Paul
Paul
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From: Midland, Texas
Compression
[updated:LAST EDITED ON 24-Dec-02 AT 02:09 PM (EST)]>I've never seen numbers that high (160) in anything I've
>tested...more like 120 or so.
>Paul
my info has it that the 312 t-bird (270hp) specs show 160-165 psi at a CR of 9.7 to 1. would think that the lower cr would reflect 120-130psi readings in the tamer 292. ei. the 300 horse supercharged ran 8.3 to 1 CR and 120-130psi CP. himmelberg
>tested...more like 120 or so.
>Paul
my info has it that the 312 t-bird (270hp) specs show 160-165 psi at a CR of 9.7 to 1. would think that the lower cr would reflect 120-130psi readings in the tamer 292. ei. the 300 horse supercharged ran 8.3 to 1 CR and 120-130psi CP. himmelberg
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From: Southern New Hampshire
Compression
Where are you guys getting your numbers from?
Im quoting Motors 24th Edition, cranking speed is not specified so they must be assuming a fully charged battery and a good battery/wiring.
PLUS they lump all Y blocks together per year.
Is there actually Ford data breaking it all down?
Im quoting Motors 24th Edition, cranking speed is not specified so they must be assuming a fully charged battery and a good battery/wiring.
PLUS they lump all Y blocks together per year.
Is there actually Ford data breaking it all down?
Posting Guru
Joined: Jan 2002
Posts: 1,002
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From: Midland, Texas
Compression
>Where are you guys getting your numbers from?
>
... got the data from the service bulletin examples in Eickman's "Ford Y-Block". my ford truck shop manual has the data for engines extant in 54 and 55 and not the 292. In 54, for example, the 239 engine cp ran 130 psi @ 7.2 to 1. himmelberg
>
... got the data from the service bulletin examples in Eickman's "Ford Y-Block". my ford truck shop manual has the data for engines extant in 54 and 55 and not the 292. In 54, for example, the 239 engine cp ran 130 psi @ 7.2 to 1. himmelberg
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From: Southern New Hampshire
Compression
That 239 info agrees with Motors.
Here is what they have for Y blocks;
1954 130
1955 130
1956-7 155
1958-62 160
These are for Ford, Edsel and Mercury cars only and they dont reference engine size or options.
With the large chamber later heads in particular I can see a reality gap here.
Thanks for the heads up.
Here is what they have for Y blocks;
1954 130
1955 130
1956-7 155
1958-62 160
These are for Ford, Edsel and Mercury cars only and they dont reference engine size or options.
With the large chamber later heads in particular I can see a reality gap here.
Thanks for the heads up.
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