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HomeAircraftHelicopterSpeed - Performance - Drag Race › How to get more hp out of the twostroker
10-26-2009 12:42 AM  8 years agoPost 21
S76 Mech

rrElite Veteran

Hatboro, Pa.

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Holy Cow!

Welcome Back Al Magaloff!

Good to see you posting again.

Gaui Greatness X7, X5, NX4, X3

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02-12-2010 08:08 AM  8 years agoPost 22
bigdad390

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East. Liverpool, Ohio

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You don't supercharge a piston ported two stroke. Intake and exhaust ports are open at the same time. No boost .
SHHHH, don't tell Detroit Diesel. They used both a turbo charger and a super charger on there series 92 two stroke engines since 1974 for semi's, buses, motor homes, marine, construction equipment and comercial stationary power aplications.

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02-13-2010 09:31 PM  8 years agoPost 23
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Shh! Don't tell Bigdad390, that a Detroit has piston ported intake, camshaft driven exhaust valves. The exhaust valves seal the cylinder from the exhaust ports. Nice try though.

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02-14-2010 02:19 AM  8 years agoPost 24
JuanRodriguez

rrProfessor

The Villages, Florida

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Hey Al !!
Good to see you back.....

And I hope that you'll stay for a while.... we need someone like you to straighten out some of the folk (that think they know what they are talking about !!)

Been there, done that and old enough to know better.....

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02-15-2010 01:57 PM  8 years agoPost 25
bigdad390

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East. Liverpool, Ohio

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Shh! Don't tell Bigdad390, that a Detroit has piston ported intake, camshaft driven exhaust valves. The exhaust valves seal the cylinder from the exhaust ports. Nice try though.
What ever, Wether the piston exposes an exhaust port or a cam opens a valve, The intake and exhaust are both open for some time during a 2 stroke cycle.

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02-16-2010 12:49 AM  8 years agoPost 26
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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Well bud, supercharge your helicopter motor, and let us know how you make out.Your assumption with regard to the Detroit is incorrect.

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02-18-2010 10:51 PM  8 years agoPost 27
bigdad390

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East. Liverpool, Ohio

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Well bud, supercharge your helicopter motor, and let us know how you make out.Your assumption with regard to the Detroit is incorrect.
Can you please explain your theory on how a two stoke cycle engine achieves an intake, compression, power stroke and exhaust in just two strokes of the piston without having the intake and exhaust open at the same time?

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02-23-2010 12:48 AM  8 years agoPost 28
Al Magaloff

rrMaster

12,199 Posts- Enough Time Wasted. See Ya!

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It's not my theory , it is practice, thanks to GM. The difference is that the Detroit's camshaft can time the exhaust valves without regard for where the piston is in it's stroke. The Detroit's pistons are not ported as our rc motors are.In an rc two strke, the piston's ports and the passages through the crankcase have fixed timing. To date, within my over crowded memory, a piston ported two stoke has never been successfully supercharged to produce boost.

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02-24-2010 10:57 PM  8 years agoPost 29
bigdad390

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East. Liverpool, Ohio

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It's not my theory , it is practice, thanks to GM. The difference is that the Detroit's camshaft can time the exhaust valves without regard for where the piston is in it's stroke. The Detroit's pistons are not ported as our rc motors are.In an rc two strke, the piston's ports and the passages through the crankcase have fixed timing. To date, within my over crowded memory, a piston ported two stoke has never been successfully supercharged to produce boost.
OK, as I asked before, how does a piston port, rotory valve, reed inlet valve, piston controlled inlet port, crossflow-scavenged, loop-scavenged, uniflow-scavenged, stepped piston engine, power valve systems or direct injection work witout the intake and exhuast open at the same time?

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04-26-2010 11:13 PM  8 years agoPost 30
jauguston

rrNovice

Bellingham,WA,USA

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Al,

Careful about your assumptions regarding Detroit Diesels all having exhaust valves. not all of them did. I put a GM 4-51 in a Ford pickup in the mid 70's that had no valves. A blower but fully ported.

Jim

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01-15-2011 11:52 PM  7 years agoPost 31
Rob P77

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Middletown, DE USA

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Let's just say for a second that it was possible to supercharge a 2 cycle engine. Would there even be a HP gain ? Isn't a 2 cycle's exhaust shape and size supposed to essentially provide the same effect by matching the exhaust pressure wave timing with the piston's location in the cylinder to actually help pull more air / fuel into the cylinder?

The man who never took a chance, never stood a chance

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01-16-2011 01:09 AM  7 years agoPost 32
jauguston

rrNovice

Bellingham,WA,USA

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Rob,

Over the years there have been a number of turbochargers built for our model engines. Mostly by the RC boat racing group. None were successful. One of the biggest obstacles is the turbine wheels get very tiny but the molecules of air stay the same size. Turbine wheel speeds needed to make something that small work was calculated to need to be in excess of one million RPM.

Good engine blueprinting can find a lot of power by the right guy. Rod Geraughty in Wisconsin was my engine builder when I raced boats and he is a master builder. There is also lots of power in fuel. Boat racers regularly use 50-65% nitro fuel.

I have 72 plaques from the American Power Boat Association for speed and competition records over 15 years I set with boats I designed with engines Rod built.

Jim

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HomeAircraftHelicopterSpeed - Performance - Drag Race › How to get more hp out of the twostroker
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