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08-23-2019, 04:24 PM #31Screaming And Flying!
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08-23-2019, 04:31 PM #32Screaming And Flying!
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08-23-2019, 04:48 PM #33Screaming And Flying!
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Noteworthy
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08-23-2019, 05:02 PM #34
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08-24-2019, 02:00 PM #35
Well B.S show me where I said "I was the best" .. Thats right nowhere
Don't show three round holes running into a flat plate less than an inch away with a kinked up mess leading away circa 1914 and call it the best ever .. you might believe it , me not so much ...
The guys in Jasper who win class .. They call them "World Champions" right ?
If so, I very grateful to just be a small spoke in the wheel of a few of their wins
And you .. ???
Originally Posted by Chaz
I was thinkin more along the lines of the 3.3 and 3.4 blocks. They'realready done, it takes quite a bit of effort to turn a 3.0L Merc into a 3.4~ 3.6 deal. But that's the direct way to serious steam ..
FMP
you need to crack an egg to make an omelette
Chaz = Yup, that what I thought ....
FMP
You start a thread on it, tell us all what the intended use or goals are and then maybe we'll trade paint or ideas.
You seemed to be interested when you thought I was going to show you what I feel is necessary to move the volume of exhaust required to support 3.5+ Litres ..
Omeletts, pictures of a motor that got the axe when I was in High School, new threads necessasary .. Intended use .. really ??
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08-26-2019, 11:16 AM #367000 RPM
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Chaz - No offense was intended.
Some small parts I figured out and fabricated have been used by guys with World Champion after their name. But nothing to brag about.
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08-29-2019, 06:45 AM #37Markus' Performance Boating Links:
www.toastedmarshmallow.com/performance
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08-29-2019, 07:01 AM #38Screaming And Flying!
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I still dont like the omc exhaust on the 90 looper
I do like the g2 exhaust, that has some big potential
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08-29-2019, 08:31 AM #39
I saw one the other day that might change your mind ...
I do like the g2 exhaust, that has some big potential
Might have been a bit of old dogs, new tricks. But I don't see too many of them in the sea of Yamaha's around here ...
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08-29-2019, 09:00 AM #406000 RPM
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Just to stir the pot,
seven marine with shorties. But it’s basically an inboard on a transom bracket.
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08-29-2019, 09:05 AM #41Screaming And Flying!
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08-29-2019, 09:25 AM #42Markus' Performance Boating Links:
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08-29-2019, 06:34 PM #43Screaming And Flying!
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too many 90 degree turns
photo Freddie WebbLast edited by powerabout; 09-18-2019 at 07:16 PM.
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08-30-2019, 09:14 AM #44
The bottom two make a 180* ...
They did the best they could to make all three "primary runners" the same length.
Adding cross sectional area to the center pair, while not as good as length adds volume to equalize the three.
Making a turn at the point of intersection tends to keep a bit of the charge going in a straight line rather than make the turn, but then they did what they could in the space they had to work with .
To make the 3 into 1 deal truly work, the runners need to merge like the onramp to the highway. That way they will all pull and return evenly ...
Power , ya know there are better ways to cut the back off than usin an "Alabama blue wrench" ..
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08-30-2019, 02:26 PM #45Screaming And Flying!
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Some vehicles have a little more room and display a more obviously tuned system. The photo shows a BombardierSki-Doo snowmobile powered by a 110HP, 3 cylinder 700 cc Rotax engine. This vehicle allows room for a larger more complex system. The exhaust manifold still allows for the short distance between exhaust ports for a pulsewave, but adds a much larger expansion cone to a provide stronger negative wave, and very possibly it also augments the positive wave at certain speeds.
OMC built the V6 above to have more equal distance spacing between the tuned pairs vs an open chest via the "primary runners" lengthened two short distances.
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