Smashed Plugs on fresh re-build, any advice?
10-29-2014 | 09:14 AM
#21
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Joined: Sep 2003
Posts: 589
Likes: 13
From: Ludington, Mi.
I saw your boat at the dock up in Traverse City back in august on that fun run. I was digging that whole intercooler setup you got going there!
I was always told to stay away from projected tip plugs in forced induction stuff, and if used, the timing lead should be compensated for them. Got this from the champion catalog
J-Gap Projected Tip
This gap style positions the spark an additional
1
⁄
8
inch into the chamber and, providing there is sufficient clearance to valves
and piston, provides the ultimate in performance. Initiating the flame front
closer to the piston top at a given spark has the same effect as advancing
the timing. Therefore, maximum timing may be reduced, which helps to
reduce detonation and octane requirement and still provides good part
throttle response. For normally aspirated engines only; not recommended
for turbocharged, supercharged, nitrous oxide or nitro burners.
https://www.pegasusautoracing.com/2014/066.pdf
I was always told to stay away from projected tip plugs in forced induction stuff, and if used, the timing lead should be compensated for them. Got this from the champion catalog
J-Gap Projected Tip
This gap style positions the spark an additional
1
⁄
8
inch into the chamber and, providing there is sufficient clearance to valves
and piston, provides the ultimate in performance. Initiating the flame front
closer to the piston top at a given spark has the same effect as advancing
the timing. Therefore, maximum timing may be reduced, which helps to
reduce detonation and octane requirement and still provides good part
throttle response. For normally aspirated engines only; not recommended
for turbocharged, supercharged, nitrous oxide or nitro burners.
https://www.pegasusautoracing.com/2014/066.pdf
10-29-2014 | 09:25 AM
#22
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Joined: Sep 2003
Posts: 589
Likes: 13
From: Ludington, Mi.
Nah i was walking the harbor at like 8am with my coffee and saw your bad boy at the dock with the hatches open. You werent around or maybe asleep in the cuddy. I just had to peep on those mills you had in there...very cool. You ran past me on the run and it sure sounded nice !
10-29-2014 | 09:30 AM
#24
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Joined: Sep 2012
Posts: 56
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From: Jefferson City, MO
Thought about that but I think the plugs are evidence enough to support what I'll find. It'll have to be torn apart regardless so I'll just get straight to it.
10-29-2014 | 09:30 AM
#25
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Joined: Jul 2004
Posts: 11,332
Likes: 73
From: chicago
Nah i was walking the harbor at like 8am with my coffee and saw your bad boy at the dock with the hatches open. You werent around or maybe asleep in the cuddy. I just had to peep on those mills you had in there...very cool. You ran past me on the run and it sure sounded nice !
10-29-2014 | 10:07 AM
#26
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Joined: Apr 2006
Posts: 10,041
Likes: 712
From: Toledo Oh
Was the fuel system set up to the procharger specs? Though no experience with them, I have read horror story after horror story about prochargers fuel system specs/recommendations not being worth a damn.
10-29-2014 | 10:16 AM
#27
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From: Jefferson City, MO
The carb was custom built just for the application and I built the rest going to it, the plugs did show it was on the slightly rich side so I can't see anything suggesting it wasn't right. The carb was done by C&S and I cannot say enough about how great they are to work with, also bought the fuel log from them that is a really nice piece. Aeromotive A1000 marine pump feeding straight to the log, boost ref Aeromotive regulator on the other side returning back to the tank, -10an all the way to the log, -8 on the return. Pressure read from a tap right in the middle of the log and set at 7 at idle, always climbed with boost like it should. Fuel is pulled through a large (I'd have to get the p/n) wix fuel filter / water separator between the tank and the pump. Can't see water getting past it but I'll empty the bowls to make them happy no less.
