Power Problems
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Joined: Nov 2005
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Power Problems
Hey all.. Finally got tired of using a garage to solve my problems with my engine. A quick history:
Last year had a new (rebuilt) 302 and C6 tranny put in my baby 72 sport short box. (modified)
about 3 months ago on a return trip my engine started to cut in & out ( shutter ) and backfire thru the Carb. But when I pulled over to check it ran fine, later discovered that it would only happen when under a high load or going up a high grade hills. Also noted that my available power is gone. When I could get the needle to disappear to working hard to get it to 100. going up hills takes forever to get 80. I've gone to my rebuilder and talked, here's the work that he's done:
New fuel pump(twice), cleaned and rejet carb, new coil, cleaned & steamed
tank, Blown fuel lines, engine analized turn out good ( they say ).
What I've done suspect the electron points so swapped it with a good distridutor, still acted up. And checked my compression here are the numbers
#1 150 psi good spark plug light brown color
#2 150 Psi same
#3 130 Psi same 87 % of highest.
#4 150 Psi same
#5 145 Psi same 96 %
#6 125 Psi same 83 %
#7 125 Psi same 83 %
#8 105 Psi good spark plug with a very light brown color. 70 % of highest.
None leaked they all held the value listed.
as you can see my compression varies alot, 75 % is 112.5 psi of my max reading. So looks like #8 does not good with #3,6 and 7 following.
I suspect the Camshaft myself but he seems not to agree.
So the question is what can I do now ?
Cheers and nice site from Moose Jaw Saskatchewan
Last year had a new (rebuilt) 302 and C6 tranny put in my baby 72 sport short box. (modified)
about 3 months ago on a return trip my engine started to cut in & out ( shutter ) and backfire thru the Carb. But when I pulled over to check it ran fine, later discovered that it would only happen when under a high load or going up a high grade hills. Also noted that my available power is gone. When I could get the needle to disappear to working hard to get it to 100. going up hills takes forever to get 80. I've gone to my rebuilder and talked, here's the work that he's done:
New fuel pump(twice), cleaned and rejet carb, new coil, cleaned & steamed
tank, Blown fuel lines, engine analized turn out good ( they say ).
What I've done suspect the electron points so swapped it with a good distridutor, still acted up. And checked my compression here are the numbers
#1 150 psi good spark plug light brown color
#2 150 Psi same
#3 130 Psi same 87 % of highest.
#4 150 Psi same
#5 145 Psi same 96 %
#6 125 Psi same 83 %
#7 125 Psi same 83 %
#8 105 Psi good spark plug with a very light brown color. 70 % of highest.
None leaked they all held the value listed.
as you can see my compression varies alot, 75 % is 112.5 psi of my max reading. So looks like #8 does not good with #3,6 and 7 following.
I suspect the Camshaft myself but he seems not to agree.
So the question is what can I do now ?
Cheers and nice site from Moose Jaw Saskatchewan
Postmaster
Joined: Nov 2002
Posts: 3,447
Likes: 1
From: Littleton, CO
I'm no expert but i would head towards making sure the valves are adjusted correctly. Then back to the distibutor. Does it run the old fashion points or new electronics? You did replace the distributor, correct, did you also put new points in if applicable?
--Mike
--Mike
