47 Lightning Imco SC #6 props
06-28-2012, 07:55 AM
#11
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06-29-2012, 07:15 AM
#12
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Location: peabody, ma-port st lucie, fl
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Here are some pictures of my exhaust rings. This is how FPM did them. I'm a little concerned because there is no tolerance..very tight fit..no room for vibration movement..I'm worried my headers might crack...Anyone experience this and could give me some advice?
06-30-2012, 11:06 PM
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thanks for all the help on the exhaust rings . i took them off and had about a 1/4 of an inch taken off the original bore, which is something that should have been done in the first place.
07-07-2012, 03:07 PM
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Ran the boat on the 4th..it totally surprised me...got on plane like if it was on rails...2500 rpm on the 2 outers and 2000rpm on the center and it jumped right on plane..
Results:
3000 rpm- 55 mph trim- 2 tab- 0
4100 rpm- 78 mph trim- 3 tab- 0
4600 rpm- 88 mph trim- 3.5 tab- 0
Boat handled totally different..i felt a little of steering torque..it carried the bow beautifully. Had wife with me on the boat..she said she didn't notice any difference on the handling..but I could tell that it had to be driven over 88mph.. and I was afraid to push it any more without a professional driver with me. So I am taking it down to Rolf Papke in New Jersey ..he is a professional racer and he is going to dial it in with me..will post results next week...
Results:
3000 rpm- 55 mph trim- 2 tab- 0
4100 rpm- 78 mph trim- 3 tab- 0
4600 rpm- 88 mph trim- 3.5 tab- 0
Boat handled totally different..i felt a little of steering torque..it carried the bow beautifully. Had wife with me on the boat..she said she didn't notice any difference on the handling..but I could tell that it had to be driven over 88mph.. and I was afraid to push it any more without a professional driver with me. So I am taking it down to Rolf Papke in New Jersey ..he is a professional racer and he is going to dial it in with me..will post results next week...
07-10-2012, 10:51 PM
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Ran the boat yesterday in New Jersey..Ran great..not as good as I expected it to..
I ran 108mph @ 5800rpm....98 @5200rpm....I think there is still more left in it. I was hoping to break 110mph..taking some diameter off the outer props and see what that will do.
I ran 108mph @ 5800rpm....98 @5200rpm....I think there is still more left in it. I was hoping to break 110mph..taking some diameter off the outer props and see what that will do.
07-11-2012, 04:20 PM
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thanks for the reply .it does feel good when you can cruise around at 4500 rpm at 85 mph . it looks like every body else here on this forum has swallowed their tongue but they will find out what i all ready know .
Last edited by 47 lightning; 07-11-2012 at 05:47 PM.
07-11-2012, 06:16 PM
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I only hope your drives can take it , otherwise thats great news .
