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Thread: Looper exhaust porting
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12-17-2013, 05:26 PM #136Screaming And Flying!
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Stuffing a looper?
is milling the inlets an easy way to do that?
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12-17-2013, 06:15 PM #137
Hogging the rod slots too much will hurt your primary compression but its necessary when you want a motor to twist up (higher rpm). There are plenty of threads about what rod slot mods work and dont work they are about as long as the oil debate threads
Fingers will help grunt everywhere, increasing volume of CC will not help you do any skiing or tubing.
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12-17-2013, 11:24 PM #138
And there you have it.
With what you want to to do with the boat, I would stop grinding and run it. Most importantly, with what you have already done, I think you need compression. 140 lbs + or - 5 lbs. Run good fuel and xd50 oil and enjoy boating. You should already have 331490 heads. If not, get some.
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12-18-2013, 12:17 AM #139
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12-18-2013, 02:35 AM #140Screaming And Flying!
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Anyone tried to make a 'tuber' looper like they do non behind the liner Mercs?
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12-18-2013, 05:20 AM #141
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12-18-2013, 05:22 AM #142
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12-18-2013, 07:29 AM #143
IMO, with the info I've gained from talking to various omc people, is if you're building a bridgeport for -7500rpm it has plenty of exhaust, what it needs is intake (fingerports), port cleaning, and intake stuffing. I plan to do just that on one of my 2.7s for my flats boat.
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12-18-2013, 10:03 AM #144
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12-18-2013, 02:12 PM #145
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12-18-2013, 03:59 PM #146
The ports feed from the bottom instead of through the piston window.
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12-18-2013, 05:00 PM #147
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12-18-2013, 06:51 PM #1485000 RPM
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The question I have is, can you make a Bridgeport spin 7500 or more without adding finger ports?
1975 Hydrostream Ventura II
1987 evinrude 200xp
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12-18-2013, 07:25 PM #149
We have a stock ported 2.7 on a lighter weight Vector it's got big bore carbs and Chris Carson reeds and unlimited packs and it turns a 14 1/2 x 27 3 blade Dr 3 and runs out of steam at 7400.
TMc
1984 Allison XR2002
1987 2.7 Fuel Injected Evinrude
16" Taylor mid
Brucato ACU.
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12-18-2013, 07:30 PM #1505000 RPM
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