supercharger vs turbo

[TurboJamie]

I have run avgas myself so don't get me wrong but I have heard that it is actually bad to run has less octane then the 100 denotes and burns slower?? I am a pilot myself and fly both airplanes and helicopters and we never seem to have a problem wtih our fuel. I have run straight and 50/50 mixed avgas in my apex with no issues. Just a heads up maybe someone more fluid in the fuels can educate me!

 

[HAMMER]

More info in this thread: http://www.ty4stroke.com/viewtopic.php?t=29536

Detonation is a form of abnormal combustion. Combustion is abnormal when a second or third flame front(s) appear in the chamber. Normal combustion only has one flame front that appears near the spark plug and crosses the chamber at 30 to 100 meters per second without misfire. The octane rating of a gasoline primarily controls the amount of heat the fuel can tolerate before a second flame front can get started. Some persons have described Octane Rating as the relative speed of combustion. In other words they believe octane governs how fast a fuel burns. That is incorrect. The speed of combustion, just superficially, may or may not decrease with higher octane in the standard methods of fuel testing in a C.F.R. research engine: Motor, Research, Aviation or Supercharged.

The speed of combustion is more a factor of the ingredients of the fuel, combustion chamber design, and the compression ratio of the engine being tested. All fuels will vary.

 

[4strokin]

damn hammer how did you get so smart?

 

[HAMMER]

28-years of trial and error and thousands and thousands of dollars on stuff that didn't work…

I’m new to Yammie 4-strokes but I’m learning quickly… Learning about performance is just like any class you would take… Research and locate the information you need, read it, filter it, understand it, and apply it… You have to want to learn… Knowledge is Power !!! (horsepower in our case).

 

[Swiss Sledder]

damn hammer how did you get so smart?

We like to think of him as The Turbo Oracle

 

[Ike]

Hey Ike, you won't be making 320 HP here in the US on any pump gas! At least not over three seconds worth. We don't have 98 octane pump fuel. If your riding trails and need to fill up anywhere, your at the mercy of available fuels on the trail. If your lake racing, or for the western guys, hillclimbing, then by all means, put in race fuel. I see too many people talking big boost, big power, and then everyone thinks they can get that type of power. Very MISLEADING for the average sport rider. Again, don't expect to get big boost power without the available octane to support it. Way to many out there are ruining engines. Mike Knapp#17

Didn´t remember that! Sorry about it. anyway, that kit has LOW and HIGH boost switch. So the rider can choose the HP amount what to use.

Mike, very true about the octane! I use 98 only in my V4. Low boost RX owners ride with 95 here (the lowest what we have).

Ike

 

[rxrider]

Ike - Guys from Alta, Norway with MC-Xpress kits installed in their '06 Apex's did dyno the "320 HP kit" at 311-312 HP last season, running on 98 octane pump gas. If I remember it right the very same kit is/was adverticed as a 310 HP kit in the US.

 

[Ike]

Rxrider, that seems to be the same kit.

Anyway, I think it´s more than enough power, even with low boost... LOL

Ike

 

[rxrider]

Turbo, Nitro or SuperCharger

 

[powder muncher]

The high test gas here in northern Canada or Alaska is 92 octane if you are lucky even cars with efi without knock sensors ping around here.

 

[Freak]

Big boost is for racing, not your average sport riding. There is no such thing as a race sled you can ride, or a trail sled you can race. Don't get greedy!!!!!!

With all due respect I disagree. That used to be true. I have one of the fastest mtn racers in north america yet I could take it for a full trail or mtn ride any time I want, and I do. At the shootout this year I raced it straight for 3 days and blew 15 bottles of Nitrous. The only sled that beat me was Lindermans which sat in the trailer until the hour of the race and was quickly put away afterwards. Yamaha changed the rules.

 

[KnappAttack]

Freak, I guess I was thinking along the lines of flatlanders. Race sleds run on ice. Clutching, gearing, suspension, chassis and studing set ups are all very different. You guys in the mountains still run in snow all the time, thus, no major changes are required. In that case I would agree. You have a trail sled you can race, as long as you run the needed octane for boost desired you can race all day in the mountains. You are correct. Mike Knapp#17

 

[misslebait]

here is a little something For all the boosted guys

SALT LAKE CITY - A British pilot broke a land-speed record for driving with a diesel engine, racing across the Bonneville Salt Flats at more than 325 mph.

Andy Green broke the supercharged diesel streamliner world record by more than 90 mph by reaching an average land speed Tuesday of 328.767 mph. The old record was 235.756 mph, set by Virgil Snyder on the Bonneville Salt Flats in 1973.

"It's absolutely astonishing what we've achieved today," Green said by telephone from the salt flats, about 90 miles west of Salt Lake City.

 

[Freak]

Freak, I guess I was thinking along the lines of flatlanders. Race sleds run on ice. Clutching, gearing, suspension, chassis and studing set ups are all very different. You guys in the mountains still run in snow all the time, thus, no major changes are required. In that case I would agree. You have a trail sled you can race, as long as you run the needed octane for boost desired you can race all day in the mountains. You are correct. Mike Knapp#17

As always a class act! And yes I can see what you meant about Ice racing.