Im thinking about investing in a wet nitrous kit for my 13b with a Weber 48IDA. Looking for only a 50 ~ 75 shot, certainly not more than 100.

After searching, Ive found that Mazdatrix says its not reccommended. And Im thinking its not reccommended because the seals most likely wont survive detonation. As is it seems my carbon seals should expect a max life of 20,000mi. But if I could even have it last for 10k thatd be fine with me. I wont be spraying all the time, but perhaps a few to several bursts per week.
Just nice to have some more power on tap.

It looks though if I avoid detonation I should be ok. Anyone have any experience with this combo?

I know theres much potential for disaster, which is why Im not going top be cutting any corners, or trying to save money at the cost of a less than proper set up. Theres only one way to do nitrous on rotaries, and thats the correct way.

Im sure someone will say 'then why not use the proper seals in the first place?' Ill answer that since I have the carbon seals with such a short life span, in the first place, I might as well have the most amount of fun with them.

Thanks for you input!

 

How about the possibility that the carbon seals might not hold up well to the amount of combustion pressures you will then be running? Im not sure, but that was my guess as to the reasoning behind them not being recommended in turbo or nitrous applications.

- Chris

 

That is a very strong possibility, I havent researched n2o on a molecular level yet, but as of now I dont think it creats much combustions pressure. Perhaps a little, but nothing like a turbo/supercharger. Otherwise more people may consider it forced induction?

 

Rice Racing mentioned keeping the BMEP below 4.0 (forgot the units) and you should be fine, this requires staged nitrous or just using a low amount like 50-75hp.

It seems to have rolled off the forum but I think I have it saved somewhere.

 

The combustion pressure must increase as you make more power. The pressure is, after all, what makes the power.

 

Yes, as delslow said, nitrous increases pressure because it expands more when combusted, and it causes more air in the same area because of the dramatic drop in intake temperature in a motor. I am not sure how far you could push them by putting on a small shot of nitrous. I would be pretty certain that just running them N/A is not putting them on the ragged edge of what they could handle.

Now the question is, which peejay mentioned, can it handle a small shot of nitrous without major problems. If Rice Racing did say that it was possible, then I believe it. Just make sure you take it easy.

Just ask Rice Racing himself, no offense peejay, to make sure that he did say that.

 

I remember he posted (I *think* it was him; he's the only one I recall ever posting detailed BMEP information) the general "curve" - like do dyno work and make sure you're not making X horsepower at Y rpm, etc.

 

Noob question time...
What is BMEP? I just searched and no threads with 'BMEP' came up...

 

base mean effective pressure? (dont really remember). It refers to the amount of pressure in a cylinder or chamber...

 

Talk to Cam at Pettit Racing, I know he told me that he used a 100 shot on carbon seals with no problems.

 

I heard alot of people run them with no problems even over 100 shot. You just have to have a good tune and keep it on the rich side and retard your timing and do not detonate or the seal will be gone. On a good note, if the seals let loose they rarely cause any damage. There is a good post about using NOS in the tech archives on Ausrotary forum. Check it out.

 

Cool, thank you much for the info!