Compression test readings...ideas
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Senior User
Joined: May 2001
Posts: 226
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From: St. Louis, Missouri
Compression test readings...ideas
I have a 302 out of a '65 Galaxie in my '51 F1. The other day when I took off, she started running like hell. I did a compression test and this is what I found:
Cyl. Dry Wet
1 150 150
2 140 150
3 60 60
4 60 60
5 140 150
6 150 155
7 150 160
8 130 140
Oil pressure is fine, no excessive smoke or steam (ie. blown head gasket)
At idle she will not run smoothly, the rpm's tend to go up and down making timmimg difficult.
She'll run, but under excelleration she sounds like hell.
Any ideas on diagnoses would be appreciated.
Thanks-
Cyl. Dry Wet
1 150 150
2 140 150
3 60 60
4 60 60
5 140 150
6 150 155
7 150 160
8 130 140
Oil pressure is fine, no excessive smoke or steam (ie. blown head gasket)
At idle she will not run smoothly, the rpm's tend to go up and down making timmimg difficult.
She'll run, but under excelleration she sounds like hell.
Any ideas on diagnoses would be appreciated.
Thanks-
Senior User
Joined: Mar 2002
Posts: 244
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From: Blenheim, Ontario, Canada
Compression test readings...ideas
Looks to me like the gasket is blown between 3 and 4. if the gasket is blown right at the narrow point between the 2 cylinders, I don't think you see any systoms in the antifreeze or the oil.
Just my thoughts as I'm no expert.
Just my thoughts as I'm no expert.
Thread Starter
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Senior User
Joined: May 2001
Posts: 226
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From: St. Louis, Missouri
Compression test readings...ideas
Good point, Macguyver, thanks. One question, though.......I need to make sure the cylinder I'm hooking up to is at TDC, right? Any tips on the best way to do this?
Cargo Master
Joined: Jun 2001
Posts: 2,571
Likes: 22
From: Oxford, Indiana
Compression test readings...ideas
Just a note on your engine - the first year for a 302 was 1969. If your engine is defintiely from a '65, it most likely is a 289.
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Senior User
Joined: May 2001
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From: St. Louis, Missouri
Compression test readings...ideas
HMMMMMMMMM.........guess I'll crawl under there and get the casting #'s off the block. The intake is a '65 anyway. Thanks!!
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From: Seattle/Tacoma Washington U.S.A.
Compression test readings...ideas
???? I wonder if my 302 is the same year as my truck???? How can I tell? I know I have to get the numbers, but where are they and who do I tell them to, so they can tell me what year it is?
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Senior User
Joined: May 2001
Posts: 226
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From: St. Louis, Missouri
Compression test readings...ideas
OK....sure enough, she's a 289. And thankfully I found a 1/8" gap in the gasket between 3 & 4 when I pulled the head. Glad that's all it was. Heads will be done monday. Thanks for the help, y'all.
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