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07-01-2014, 03:47 PM #91Screaming And Flying!
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07-01-2014, 03:50 PM #92
I found it interesting that a prior patent had described the ability to sonic-supercharge a two cylinder by a tuned common exhaust. OMC just expanded it to include "three or more cylinders". The other referenced patents were very interesting also. I also realized how hard it is to read a patent...
Thanks for the links.
96 Cougar 23 MTR twin 300XS's. 100 something
98 Laveycraft Sebring 20.2 Tunnel 280 90 something SOLD
85 Baker RST 220 Laser SOLD
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03-31-2017, 12:48 PM #93Member
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03-31-2017, 01:08 PM #94
One thing to consider when stuffing the crank case you are increasing velocity through the ports. when the velocity increases the angles and directions of the transfers need to be adjusted.
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03-31-2017, 03:25 PM #95Member
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03-31-2017, 03:58 PM #96
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12-31-2017, 06:55 PM #97Screaming And Flying!
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ttt , Happy New Year
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01-05-2018, 10:24 PM #986000 RPM
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That exhaust looks somewhat like what Junior and Del Eaves used to do for us drag racing but a little more curvy.
We needed bottom end also.
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01-05-2018, 10:36 PM #996000 RPM
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01-05-2018, 11:38 PM #100
A different angle on another one I've done. Real similar to what Eaves was doing. The main difference is I am blending the angle in the space between the ports and Eaves was leaving an edge. I think I like Eaves way a little better as it should have a little better velocity and help prevent flow from sticking to floor and help send it over the next guy in line. I think on next build I'm gonna try it that way and see how it does. You are right it does make a surprising amount of low/ midrange power. BTW Eaves was the man!
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01-06-2018, 07:05 AM #101Screaming And Flying!
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I think someone needs to make a stacker from a v6 or even 2x 3 into 1 collector
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01-06-2018, 07:34 AM #102
Very interesting and thought provoking thread.
There's a lot to be taken from this even though i,m building a V4 trying to get a strong 6500 RPM not for all out speed.
Just a strong reliable lake motor.
How does polished exhaust (mirror shine) compare to a smooth finish?
Longer for carbon to bind to ?
Faster flow ?
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01-06-2018, 07:42 AM #103
I like to polish mine mainly so carbon doesn't stick and restrict/slow flow in the long run. I feel a not so slick finish actually flows better and would be great on motor that was constantly coming apart and getting cleaned.
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01-06-2018, 08:25 AM #104
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01-06-2018, 08:50 AM #105Screaming And Flying!
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Whats different with the powerhead?
The exhaust is longer than stock, more low end..is it for waterskiing?
LolLast edited by powerabout; 01-06-2018 at 08:52 AM.