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05-08-2005, 04:18 PM
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#1 |
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68 Coupe 289
Join Date: Apr 2005
Location: North carolina
Posts: 44
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Your opinion on engine diagnostic
Hi everyone, just wanted some opinions on what is going on with my 68 Coupe. First off its a 289, Holley 650, Edelbrock RPM manafold, milage unknown but receipts say it was rebuilt in 1991. I have some smoke out the breather tube and the exhaust under acceleration. Otherwise it runs great. I have set the valves, carb. and put in new plugs.
Vacuum reads 18 steady. Compression reads, 1 120 lbs. (150 with a teaspoon of oil) 2 135 lbs. 3 145 lbs. 4 145 lbs. 5 135 lbs. 6 130 lbs. 7 125 lbs. 8 135 lbs. I am thinking that #1 and maybe # 7 piston has bad rings. Your thoughts?
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05-08-2005, 05:56 PM
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#2 |
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Factoy Five Roadster
Join Date: May 2000
Location: Sevier Co,Tennessee
Posts: 1,681
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Re: Your opinion on engine diagnostic
30 lbs is a big increse wet, too much.
With that much of a increase with oil, the rings are leting alot of pressure by. Rings for sure. Im just guessing, but I bet the motor was re-ringed and not bored. Nowz the time to get a 5.0 roller motor.
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Frank |
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05-09-2005, 08:32 PM
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#3 |
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Registered Member
Join Date: Sep 1998
Location: Oviedo, FL
Posts: 992
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Re: Your opinion on engine diagnostic
Big increase with the oil. Definatly bad rings. As stated above, good chance that someone threw a set of rings at it without boring and honing.
Time for a rebuild.
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"Support our Troops" Dave 1968 Cougar 2004 Thunderbird 2007 F150 Harley-Davidson, SuperCrew 1986 LTD 1997 Ranger 1992 Honda Civic |
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