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10-17-2021, 02:27 PM #16The Historic Photo Master
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...wildcard: boosted dfi 2 cycle...
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Instigator liked this post
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10-17-2021, 02:31 PM #17
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Instigator liked this post
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10-17-2021, 03:24 PM #186000 RPM
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The problem with that is that a 2-cycle can’t trap the charge to allow pressurization over ambient. The cylinder is open-ended when the intake port is open, so it can’t build pressure. With a 4-stroke, the exhaust valve is closed for most of the intake stroke giving the pressurized air nowhere to go so it has to build pressure (and density) in the cylinder.
The only way I can see it working on a 2-stroke to any real advantage is with turbocharging where the exhaust pressure rises as boost increases, thereby holding it in on both ends of the engine, if you will. But anyone who’s ever attempted to balance pressure in a turbo system knows it would take a ton of engineering time and experimentation to get it working properly and at that’s just at wot. And even if it does all work out, we’re a looong way from “stock” at that point.
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10-17-2021, 03:46 PM #19The Historic Photo Master
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10-17-2021, 04:16 PM #206000 RPM
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10-17-2021, 07:11 PM #21The Historic Photo Master
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...august 2nd, 1984...bill correia, using a standard land & sea turbocharged v-6(mercury 200), posted the fastest top speed(130.50 m.p.h) ever recorded for an outboard powered v-hull.** **official NEBA certified flying 1/4 mile trap speed. (the boat was an allison.)
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10-17-2021, 07:34 PM #226000 RPM
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Yea, I didn’t say impossible just harder than most could imagine. Ski-doo makes the turbo sled as well, but a lot can be done with a multi-discipline oem design team and a couple years time.
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10-17-2021, 08:10 PM #23Supporting Member
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BRP has the technology but obviously didn't feel the market is big enough to continue the chase on outboards. Here is their production two stroke turbo sled-they work really well.
https://www.youtube.com/watch?v=cjsbE4jnX1Y
Joe
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Instigator liked this post
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10-17-2021, 08:37 PM #24
I get to put the fourth prop shaft in one next week. There will be a 28 skater up for sale soon I thinks..
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Michael J Giesler liked this post
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10-17-2021, 08:37 PM #25
They also use RAVE valves unlike outboards for more efficiency, 165 HP from 850cc = NICE light powerful.
Wayne Taylor was working on a similar system before he died, been many years I don't remember the specifics.
Wayne was COOL.
Lenco
http://montyracing.com/html/photo.htmlWe have invented the world; WE see
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10-17-2021, 08:56 PM #26The Historic Photo Master
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Beak Boater, Capt.Insane-o liked this post
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10-17-2021, 08:58 PM #27
Mad Mans power valve project motor that died with him RIP Wayne Taylor
We have invented the world; WE see
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10-17-2021, 09:15 PM #28
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10-18-2021, 11:46 AM #29Supporting Member
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A good set of thru hub props will solve this issue. I shook the hell out of my LCB and thought for sure that I was going to kill it. Went to a thru hub to keep the air off the blades and bingo-problem was solved. If the guy insist on getting rid of it, please give him my number.
Joe
386 527 18fourfive
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10-18-2021, 01:01 PM #306000 RPM
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BRP produced and sold the 150HP 3 cylinder that utilized the RAVE exhaust system. When the G2 lineup first came out they were advertising the RAVE system for the 300HO. To my knowledge it never made it to market. Curious as to what the design problems were with it.
https://www.wavetowave.com/home/2019...ee-cylinder-g2
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