What would happen if........

[1CrazySledder]

A person ran a stage III supercharger on pump fuel with a shot of NOS? Just a thought.

1CS

 

[Skydog]

What psi of boost? What octane fuel? Stock compresion?

 

[1CrazySledder]

What psi of boost? What octane fuel? Stock compresion?

I would imagine the psi would be at or above 17, 93octane, with the the stage three, you get pistons and rods and I would probably add the headspacer from powderlites as well so the comp. would be different.
I was just curious of the thought. Probably couldn't happen, though. LOL

Vince

 

[rxrider]

I think 93 is too little octane as you would be making 280+ HP. It may be made possible with an ignition retard of some degree, but that is a compromise giving away low end power for the benefit of more top end power. Ask Ted Janetty directly or search for a post with the topic "Rules of thumb with boost" written by Ted.

 

[RED]

Likely end up with comp ratio of 7 to 1, depending on what pistons you put in, either JE 9 to 1, or Wiescos 10 to 1. The head shime drops about 3 points.

 

[rxrider]

I was running Wiseco 10:1 and three head gaskets for a compression ratio of 8.28:1. I had gasket failure on cylinder 1 on pto side running 16 lbs of boost and 93 octane (us). After talking to MCXpress I went with their recommondation of stacking 2 yamaha gaskets together with 10:1 pistons for a 9.05 compression ratio. They explained that too much squish band could cause heat build up in the gaskets to the point they fail. I do not know if this applies to the head shims tho. After going to 2 gaskets I had no problems for the remainder of the season.

 

[Skydog]

Rxrider how did you know you lost a gasket?

Thank you Skydog

 

[rxrider]

Skydog - When my sled started to push coolant on high boost I knew something was not as it should be. I did check the coolant and found traces of black silicone from the gaskets. I searched the forums and found that others had this happen as well. Decided to tear down my motor and found out that I had blown the gaskets on cylinder 1, all of them were shot.

 

[Skydog]

Man i have that black crap in mine but dont have to add any? And it was there right after warm up. So i think mine is from the old gasket?.(I hope)

Skydog

 

[rxrider]

If it don't push coolant and you don't have to add any, it do not leak. You are OK as long as you do not raise boost. I did ride it at the high boost setting a few more times after is started leaking and the leaking got worse until the point it started to leak even at low boost setting trailriding.

A friends Attak started to leak at high boost making 310+ HP, he switched down to low boost 260 HP and leaking stopped. His coolant was full of black silicone but his gasket did still seal.