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#1 |
Registered User
Join Date: Nov 2003
Location: Mandan, ND
Posts: 422
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Please help! Have compression test results now
Please help me with this post.
thanks http://67-72chevytrucks.com/vboard/s...threadid=79272 here are the compression results ...............................firewall passenger side................................drivers side 155......................................................145 150......................................................150 160......................................................145 145......................................................140 ..........................water pump hope this helps anyone!
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Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB Last edited by 72superBB; 12-03-2003 at 04:05 PM. |
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#2 |
Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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Interesting....does the engine burn any oil (blue smoke?) ?
Maybe it is coming from that vent tube you have going from the valve cover to the air cleaner....is the inside of the tube all oily? Are you running a PCV valve? (the tube looks more like a vent tube....could be a big block PCV, i dunno)
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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#3 |
Registered User
Join Date: Nov 2003
Location: Mandan, ND
Posts: 422
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There is a pcv valve on the other side. I was told the tube you see is called a flame arrestor (sp). It does smoke a tiny bit when started. What is in the picture is what happend after a 120 mile trip.
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Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB |
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#4 |
Formerly yellow72custom
Join Date: May 2001
Location: Austin, TX
Posts: 7,531
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I would check the inside of the flame arrestor tube then....along with the inside of the PCV valve tube....they could be sucking in oil....just a guess
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'72 Chevy C10 Mild 350/TH350/3.07. Ochre/White. Old high school ride. '70 GMC C2500 '62 327 4bbl/SM465/4.56-geared Dana 60. White/White. Project or parts truck. '97 Saturn SL DD. 1.9/5-speed. 40+ highway mpg |
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#5 |
Registered User
Join Date: Jun 2002
Location: Knoxville Tenn.
Posts: 3,058
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Check your PCV valve to see if it working--pull it from valve cover with motor running and put you finger over the end of PCV --if working it will have a suction on it. If not you will build up pressure in crankcase from the blowby (air that is forced by piston rings when a cylinder fires) which forces oil mist up the tube into air cleaner. Where is the PCV hooked up to on carb? If hooked up right and it is working you have bad, broken or worn out compression rings. What the PCV valve does is create a suction inside the motor to pull out any blowby and run it back thru the motor. Air that it pulls out is replaced by air that is pulled thru the tube from breather. If no suction the pressure has to go somewhere hence out the tube which is the path of least resistance. Be sure and read this twice as there will be a pop quiz on it tomorrow.LOL
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56 Chevy Bel-Air 2dr. HT (purchased new) 71 Chevy Cheyenne SWB PU (502HO) 65 GMC short bed step--work in progress and my gofer |
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#6 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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put on baffeled valve covers
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#7 |
Registered User
Join Date: Nov 2003
Location: Mandan, ND
Posts: 422
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I replaced the pcv valve last week and the air filter when Igot the oil changed., so I know the vavle itself works. I will check to see if it is sucking in the morning (no pun intended). When I check the flame arrester, what am I checking for/
thanks
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Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB |
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#8 |
Registered User
Join Date: Nov 2003
Location: Mandan, ND
Posts: 422
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What will baffled vavle covers do for the problem?
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Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB |
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#9 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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with baffeled valve covers the oil will basically hit the baffels and drip back into the head instead of getting sucked out and into the carb
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#10 |
Registered User
Join Date: Nov 2003
Location: Mandan, ND
Posts: 422
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ttt
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Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB |
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#11 |
Registered User
Join Date: Mar 2003
Location: Stillwater MN
Posts: 1,166
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I'm with cdowns. Most aftermarket valve covers do not have baffles in them. Pull the metal tube out of the valve cover grommet and look down in with a light....if you see the head, pull those suckers off, and trash them. If you see a metal plate (baffle) then you may be looking at eccessive blowby.
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69 GMC K10 ..some restoration required....still.. ![]() |
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#12 |
Registered User
Join Date: Nov 2003
Location: Mandan, ND
Posts: 422
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ttt
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Life is full of choices and a Chevy is the best choice. 1990 Chevy SWB |
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