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05-28-2016, 10:49 AM | #1 |
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Location: KY
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Compression test - cylinder head
My compression test results: 85,86,86,89 (psi)
I notice others post numbers in the 50's. Does that mean I have an other than stock cylinder head? It's not aluminum. I have a '30 engine (stock, as far as I know) in a '29 Tudor. |
05-28-2016, 11:00 AM | #2 |
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Re: Compression test - cylinder head
Yes. Ron W
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05-28-2016, 11:06 AM | #3 |
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Re: Compression test - cylinder head
And you should be HAPPY.
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05-28-2016, 12:20 PM | #4 |
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Re: Compression test - cylinder head
Your gauge may be loose
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05-28-2016, 12:35 PM | #5 |
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Re: Compression test - cylinder head
we just had a friend do a 28 standard head, 63,63,64,64 and with a compression ratio of 4 to 1 figures are good.
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05-28-2016, 12:35 PM | #6 |
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Re: Compression test - cylinder head
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I get the same readings on a 6.8 to 1 Winfield aluminium head And try another compression tester just to make sure.... |
05-28-2016, 12:36 PM | #7 |
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Re: Compression test - cylinder head
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05-28-2016, 12:46 PM | #8 | |
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Re: Compression test - cylinder head
Quote:
Your compression ratio is only up around the 5.5 to 6.0 range. Regular fuel is fine for that. If you hear the engine knock climbing a steep hill, retard the spark a tad (about 1/4 of the quadrant travel) and the knock should stop. Your compression numbers are quite close to each other, so I'd say all is good. Just go drive it and have fun!!!
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05-28-2016, 12:58 PM | #9 |
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Re: Compression test - cylinder head
Pics of head:
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05-28-2016, 01:06 PM | #10 |
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Re: Compression test - cylinder head
That first picture is a good one to show the bellcrank for the throttle linage, to show the angle it rests at. This would be for the person that showed a welded link the other day, and was having trouble.
Why such a tall stud on the water outlet? |
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