Im thinking about supercharging my 12a soon. What kindof HP difference could i expect to see between using stock 12a rotors, or finding some low compression rotors and using them. Any help would be greatful.

 

I'm looking at supercharging the 13B i'm building. I talked to Atkinsrotary.com about their camden supercharger. They said that if I was going to use the stock N/A rotors, then I shouldn't boost over 5 or 6 psi. The lower compression rotors used in 13B turbo models boost up in the 14-18psi range. I don't know what that translates into as far as HP, but lets say standard air pressure is 14psi. A boost increase of 7psi is a 50% increase of air, requiring a 50% increase of fuel. A boost increase of 14psi is 100% or 2 times the amount of air/fuel so in my mind it should be almost a 100% increase in power. For a belt driven supercharger, something like 10%(roughly) of the power goes back to running the blower itself.

Go here to see the camdensupercharger made specifically for rotary engines.(unless that is the one you were already planning to use.)

 

Unfortunately that's not the way it works as compressors are never 100% efficient. This is basically a measure of how the much the air being moved by the compressor is heated up.

75% is usually considered good for a turbo charger and older roots style blowers are far less efficient. Obviously the lack of intercooling makes it even worse.

 

I know its not 100% efficient, but I didn't want to over complicate my explaination.

 

Yes i was gonna go with the camden 5 or 7 inch. If low compression rotors are worth going with and would give me a good bit more hp then i should probably find some or find a jspec 12at or something, and go supercharged. So far noones told me its the right way to go so im still waiting for an answer.

So if i used the low compression turbo rotors, that automaticly gives me more boost than if i had the same pully's and used the stock NA rotors?

 

I cant seee any difference...


To me, it seems, that if I run 10 psi on stock rotors, and making, lets say, 225hp... That seems to me, if I run 10 psi on low compression, I would be lower in HP... like 200HP instead!


Now, if i have a motor that can only run 15psi tops and produce 260HP with N/A rotors, and a motor that can handle 25 psi, and be able to produce 300hp, with low compression???????

This is the one question that wants to be answered!::::
If I put in lower compression rotors, would I be able to handle more boost resulting in more HP???


And, wouldnt more boost tearup the motor faster?!?!



Thanx, Laterz, Andrew

 

I called atkinsrotary before and asked them about using N/A or turbo rotors. They said that N/A rotors shouldn't be boosted above 5 or 6 psi, like what the 5 inch blower uses. The reason is that the air fuel mixture could detonate prematurely due to so much compression, leading to damage and destruction. The lower compression turbo rotors were designed to handle more boost. They also say that the 5 inch blower at 6 psi will increase HP by 30%

 

No, it's just that the low compression rotors allow you to run more boost without detonation by lowering the peak combustion chamber pressure.

 

Bingo

 

Thanks for answering my question and giving me some other good info too. I think i pretty much know what i need to know now. Thanks.

 

Good Luck finding low compression rotors in any kind of usuable shape.

 

So, would a 12a Bridgey turbo, be cool?!?!?





hummm.... Would it work ???


or would the seals go to quikly?!?!


Dunno.... I need to just sell the bridey... nobody wants/can afford it though...


bye!

 

Actaully Directfreak ive seen good ones on ebay a few times and some other places too. Its not impossable.

 

YES IT WOULD WORK.