|
|
|
|
Joined: Feb 2016
Posts: 95
Shade Tree Mechanic
|
OP
Shade Tree Mechanic
Joined: Feb 2016
Posts: 95 |
Hi, I'm crazying
I have a problem whit my 29 Chevy.
The engine is not running well, sometimes it runs 5 cyliners, other times it runs 4 cylinders.
I'm testing sparks and they're ok.
I adjusted valves (0,008").
No results.
I'd like to know wich is the cylinders' compression.
I see in another topic that the compression of the engine for Chevy 1931 is 70/90 psi.
Is it the same thing for 29 Chevy?
Thanks for help.
Saluti dall'Italia, Alfredo
|
|
|
|
|
Joined: Nov 2001
Posts: 29,863
Tech Advisor ChatMaster - 25,000
|
|
Tech Advisor ChatMaster - 25,000
Joined: Nov 2001
Posts: 29,863 |
The Mangy Old Mutt
"If It's Not Junk.....It's Not Treasure!"
|
|
|
|
|
Joined: Feb 2016
Posts: 95
Shade Tree Mechanic
|
|
OP
Shade Tree Mechanic
Joined: Feb 2016
Posts: 95 |
Thanks Yunkyard Dog.
I make a test and I check.
Saluti dall'Italia.
|
|
|
|
|
Joined: Feb 2016
Posts: 95
Shade Tree Mechanic
|
|
OP
Shade Tree Mechanic
Joined: Feb 2016
Posts: 95 |
Hi,
It's been a year and I I start writing again.
I have controlled compression with test dry and all cylinders have 60 psi with cold engine.
Equal values (60 psi) with hot engine.
Open Throttle.
What do you tell me?
Saluti dall'Italia.
|
|
|
|
|
Joined: Feb 2016
Posts: 95
Shade Tree Mechanic
|
|
OP
Shade Tree Mechanic
Joined: Feb 2016
Posts: 95 |
Someone can help me?
I have read that the compression ratio for '29 is 5:1
My compression is 60 psi. Is it good?
|
|
|
|
|
Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
|
|
ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
For older models all of my material just states compression should be the same on all cylinders and does not give a number.I would say 60 pounds for that engine with all being equal is fine.
Compression gauges can vary as well as engine cranking speeds and engine temperature.
If cylinders cut out at times and is not an ignition problem you could have valves sticking and not closing properly and can be caused by carbon on the stems or guides too tight if they are new.
Last edited by Chev Nut; 07/30/18 01:55 PM.
Gene Schneider
|
|
|
|
|
Joined: Nov 2001
Posts: 19,758 Likes: 64
ChatMaster - 15,000
|
|
ChatMaster - 15,000
Joined: Nov 2001
Posts: 19,758 Likes: 64 |
60 psig for a used engine with unknown history is okay. The fact they are all about the same indicates that nothing major is wrong. Your problem is more likely ignition or a sticking valve or two.
How Sweet the roar of a Chevy four!
|
|
|
|
|
Joined: Feb 2016
Posts: 95
Shade Tree Mechanic
|
|
OP
Shade Tree Mechanic
Joined: Feb 2016
Posts: 95 |
|
|
|
|
|
|
|
