Mercruiser 502 MPI 1995 Running issues
06-22-2019, 03:02 PM
#21
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I'm going to try that again. I tried it multiple times, but never while I was giving it throttle. I have to take the plenum off to change it around, but its not that hard. It just blows my mind that it came in the door like that and he said it had just been redone when he bought it, said he ran it a full season like that and he got like 72 mph out of it and that was with a flat tappet cam! On the other hand, he only got one season out of it. LOL Regardless, I will do that and see what happens. Thanks guys!
06-22-2019, 03:16 PM
#22
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I tried posting pictures with my phone, but I guess it's taking longer or something. The exhaust is just a standard Mercruiser exhaust with silent choice and the cam is a Comp part number 11-000-8
Grind number Camshaft, 3110B/3112B HR 114.0 + 4.0
SPC INSTR 1:
SPC INSTR 2:
SPC INSTR 3:
Intake Exhaust
Valve Adjustment Hyd Hyd
Gross Valve Lift .566 .578
Duration@
.006 Tappet Lift 284 290
Valve Timing Open Close
@ .050 Int: 2
Grind number Camshaft, 3110B/3112B HR 114.0 + 4.0
SPC INSTR 1:
SPC INSTR 2:
SPC INSTR 3:
Intake Exhaust
Valve Adjustment Hyd Hyd
Gross Valve Lift .566 .578
Duration@
.006 Tappet Lift 284 290
Valve Timing Open Close
@ .050 Int: 2
06-22-2019, 05:16 PM
#23
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Valve timing Open Close
@.050 INT 2 btdc 42 abdc
exh 53bbdc 3- atdc
These specs are for cam installed
@110.0 intake center line
Intake exhaust
Duration @ .050 224.00 230.00
Lobe Lift .3330 .3400
Lobe separation 114.0
@.050 INT 2 btdc 42 abdc
exh 53bbdc 3- atdc
These specs are for cam installed
@110.0 intake center line
Intake exhaust
Duration @ .050 224.00 230.00
Lobe Lift .3330 .3400
Lobe separation 114.0
06-22-2019, 05:37 PM
#24
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my question is, is the cam to be advanced 4* at install ?
06-22-2019, 10:00 PM
#26
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Firing order on my 502 is 18726543. Prob not it, just an off the wall thought.
06-24-2019, 09:01 AM
#27
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I just talked with comp cam and gave them the serial number on the cam and they verified that it's a standard 1-8-4-3-6-5-7-2 which is the way I had it set up, so I don't know what to next. I'm at a loss
06-24-2019, 09:09 AM
#28
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A 1995 MPI with a flat tappet cam - that's new
The injector wires only go on one way, there keyed. Can mix the connectors but not how they go on
Injectors are batched fired so 2,3,5,8 with Dark Blue and 1,4,6,7 with Light Green
What fuel pressure are you seeing and is this cool fuel, VST or other?
The injector wires only go on one way, there keyed. Can mix the connectors but not how they go on
Injectors are batched fired so 2,3,5,8 with Dark Blue and 1,4,6,7 with Light Green
What fuel pressure are you seeing and is this cool fuel, VST or other?
06-24-2019, 09:31 AM
#30
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I know seems redundant but maybe check compression if you haven't pulled the motor yet. Something real strange going on.
