Blue pill or red pill?
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Senior Member
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Joined: Jul 1999
Posts: 844
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From: Long Island, NY
Car: 1987 GTA
Engine: 645hp/656 ft lb Blown 383
Transmission: 700-R4 3,000 stall
Axle/Gears: 3.55 moser 12-bolt
Blue pill or red pill?
Okay: In short, built a new motor and it is running crappy. I took it to a top notch mechanic. He said two things:
ONE, He said it either looks like a vaccume leak becuase the intake manifold pressure is low (unless the cam is huge, but it's a like a 230/230 500 lift on a 112). I do have a superam. I guess it could be leaking, but I checked it with a can of carb cleaner and it's okay, so could it be an internal gasket leak?
TWO, he said it really seems to him like the cam timing is off. I had to take the front timing cover off once, to put the oil galley plugs in and the cam gear had to come off. I did HAVE TO move the crank maybe just a couple of degrees to get it back on. I knew a couple of degrees really shouldn't matter, unless maybe somehow it jumped a whole gear. I don't think it jumped a whole gear, and also the car seemed to run pretty crappy before the gear was removed. So, i'm not to confident it is that it is definately that. he said it could be the balancer also that is off and spun a little.
I have two choices, pull the intake apart i guess or pull the timing cover again....so which is it? and why?
ONE, He said it either looks like a vaccume leak becuase the intake manifold pressure is low (unless the cam is huge, but it's a like a 230/230 500 lift on a 112). I do have a superam. I guess it could be leaking, but I checked it with a can of carb cleaner and it's okay, so could it be an internal gasket leak?
TWO, he said it really seems to him like the cam timing is off. I had to take the front timing cover off once, to put the oil galley plugs in and the cam gear had to come off. I did HAVE TO move the crank maybe just a couple of degrees to get it back on. I knew a couple of degrees really shouldn't matter, unless maybe somehow it jumped a whole gear. I don't think it jumped a whole gear, and also the car seemed to run pretty crappy before the gear was removed. So, i'm not to confident it is that it is definately that. he said it could be the balancer also that is off and spun a little.
I have two choices, pull the intake apart i guess or pull the timing cover again....so which is it? and why?
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Joined: Dec 2002
Posts: 531
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From: BC Canada
Car: 81Malibu
Engine: SBC 355
Transmission: TH400
did you line up the dots on the crank and cam sprock?
You will need to do tuneing to get to perform.
What all done to the computer?
Whats your timeing set at?
You will need to do tuneing to get to perform.
What all done to the computer?
Whats your timeing set at?
Thread Starter
Senior Member
iTrader: (3)
Joined: Jul 1999
Posts: 844
Likes: 0
From: Long Island, NY
Car: 1987 GTA
Engine: 645hp/656 ft lb Blown 383
Transmission: 700-R4 3,000 stall
Axle/Gears: 3.55 moser 12-bolt
timing is set at 0,
the PROM is modified for my old setup, but modified, non the lesss.
I didn't line up the dots after the original cam install, after i took the cover off, and installed the galley plugs, I just put the ti ing chain back on and had to move the crank a touch. I think i should pull it back apart and then manually turn the crank so the dot faces up , then install the cam gear so the dot faces down, then turn the motor so the cam dot faces up right? thanks
the PROM is modified for my old setup, but modified, non the lesss.
I didn't line up the dots after the original cam install, after i took the cover off, and installed the galley plugs, I just put the ti ing chain back on and had to move the crank a touch. I think i should pull it back apart and then manually turn the crank so the dot faces up , then install the cam gear so the dot faces down, then turn the motor so the cam dot faces up right? thanks
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Senior Member
Joined: Dec 2002
Posts: 531
Likes: 0
From: BC Canada
Car: 81Malibu
Engine: SBC 355
Transmission: TH400
Try turning the timeing up about 6-8* and see if that helps.
Also every T-chane i've installed, i put the crank dot up and the cam dot down.
Dose your crank sprocket have more then one key way?
Hope thing start going better for you....
Also every T-chane i've installed, i put the crank dot up and the cam dot down.
Dose your crank sprocket have more then one key way?
Hope thing start going better for you....
Thread Starter
Senior Member
iTrader: (3)
Joined: Jul 1999
Posts: 844
Likes: 0
From: Long Island, NY
Car: 1987 GTA
Engine: 645hp/656 ft lb Blown 383
Transmission: 700-R4 3,000 stall
Axle/Gears: 3.55 moser 12-bolt
yeah, thanks i am starting to give up, i think i'm gonna tear it apart again. I was gonna put crank up and cam down, then turn the cam 180 degrees so it's right on #1 to fire. I hope this works...even if i advance the timing, the valves will still not be in sink with the pistons i think. thanks - Justin
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