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Thread: sleekcraft modvp blowout help!
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04-24-2012, 07:32 PM #1
sleekcraft modvp blowout help!
Whats up guys,need some help on setting up one of my boats.Its a 21ft sleekcraft modvp hull.It has the 24inch built in set back in it.I have a bridgeport on it slightly worked with a 14.5 30clever,1:87gears.I redid the whole boat over winter(stringers,dash,transome ect.)I rigged the boat with the battery about 4inchs behind the driver seat and the gas tank right behind the battery.i had the motor on the bottom last hole which brings the shaft level with the pad.I was getting blowout at 90-91mph revs were about 67-6800 and still climbing if blowout didnt happen.I thought the motor was to high so i dropped it a hole now its about 1/2' below pad.Went out for another spin going into the wind it ran 94 at 7000 no blowout,but as soon as i turn around and go with the wind i get blowout at 92mph at 6800rpm.I believe the motor has to come up to get my revs up but i cant bc of my blowout situation so im thinking on moving my tank and battery as far back to the transome as possible.Im just alittle on the freaked out side of not having enough weight up front and not blowing out but blowing over.Does any1 know if these hulls run good with weight in the rear and the bow hanging high?Im going to spend all season long dialing this boat in but if some1 can give me alittle help on setup so i dont waste my whole summer i could really use it.This is my first tunnel boat i have about 6years of seat time in a 16ft superboat so switching over from vhull to tunnel is a different ball game.Thanks guys
edd16ft superboat
14ft vixan
15ft viper
24ft sleekcraft
21ft sleekcraft modvp
18ft action hst drag
18ft accelerator drag
21ft redline
18ft vking yt
20ft Allison grandsport
20ft laser 420
18ft X-Stream Vking
24ft banana
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04-24-2012, 08:55 PM #2
not sure about the sleek craft but i know my stoker runs better the further back you put the internal weight...i would say give it a shot and experiment moving the weight around and see if it makes a difference. take care with the trim button...it sounds like you already know that....stay safe and keep it right side up!
shaun
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04-25-2012, 09:40 AM #3
IMHO,too much setback!
why ask me ?
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04-25-2012, 10:42 AM #4
my sleek had 16" setback and i ran the prop shaft 1.5 to 2 " higher then pad i was running mid to high 80mph with a 225 mercury 3.0 never blow out hope that helps .
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04-25-2012, 12:16 PM #5
the set back is built in....sleekcraft made a few of these back in the mod-vp hay day that were super light and are now pretty rare...it seems like the sleekcraft sst needs a lot of set back to get them to fly
i almost bought this one when i was 16...it sold just before i came up with the $$$
Last edited by 2.5_stoker; 04-25-2012 at 12:22 PM.
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04-25-2012, 12:30 PM #6
Which gearcase are you running?
'89 Hydrostream Vegas XT, '90 Merc 2.4 Bridgeport PCU EFI
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04-25-2012, 03:05 PM #7
1:87 cle with a nosecone on it.i also got 14inch tunnel tabs for it,but those will prob make the blowout even worse.
16ft superboat
14ft vixan
15ft viper
24ft sleekcraft
21ft sleekcraft modvp
18ft action hst drag
18ft accelerator drag
21ft redline
18ft vking yt
20ft Allison grandsport
20ft laser 420
18ft X-Stream Vking
24ft banana
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04-25-2012, 03:12 PM #8
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04-25-2012, 05:13 PM #9
think about a teeter totter,I just think it's out of balance!!maybe a heavier 3 liter would even it up!
why ask me ?
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04-28-2012, 08:10 AM #10Junior Member
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04-28-2012, 08:50 AM #11
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04-28-2012, 10:42 AM #12
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04-28-2012, 11:15 AM #13
yeah that would be sweet.i moved the gas tank back by the transome just went out for a ride brought it up to 91mph at 6700 and still pulling hard no blowout so far but i couldnt hold it WOT to long started to get rough out there had to come back in
16ft superboat
14ft vixan
15ft viper
24ft sleekcraft
21ft sleekcraft modvp
18ft action hst drag
18ft accelerator drag
21ft redline
18ft vking yt
20ft Allison grandsport
20ft laser 420
18ft X-Stream Vking
24ft banana