30psiBoost

I know on piston engines when the power shoots up, internals get forged, blocks get reinforced, etc, what do you do if anything to a rotary, strengh wise? how much boost can they hold b4 they pop, or need stonger parts?

RICE RACING

Bro, years ago people laughed at me when I said I calculated out the strength of certain parts for short duration use.

My figures were basically a limit of around 1200 to 1300bhp in terms of internal pressure that the E shaft, 2mm seals and rotor faces can take without exceeding peak tensile limits of the materials used. This is with a rev limit of 8800rpm.

Every year people are making more and more power from these little things with relativley little modifications, basically consisting of clearancing the std components...thats it. It is not uncommon to find a hand full of people making around or over 800bhp from these things and they are not hand grenade engines either.

I remember hearing of a dyno graph of Able's car making over 900rwhp from his 13B in a drag application. As always people will tell you that you need many different things like ceramic seals and the like to get any where near this, but the calculations say other wise, and some people are coming very close to proving this to be correct

It is when you start to increase the RPM above 8800rpm that you start to have problems and you need to race clearance the rotors to stop them from hitting the end plates and to a lesser extent the rotor housings...along with other blue printing procedures, there is amazingly very little needed to be changed in a late model based 13B turbo engine. You just gotta know what the thermal/mechanical limits are, as if you dont you will either warp a seal, detonate a seal, crack an end plate, snap a crank in half due to a rotor crashing into bits its not ment to etc etc

In this respect I think we have it very lucky indeed, Piston engines of similar displacement have ALOT more performance potential, but it is in general are NO WHERE NEAR AS CHEAP.

That is why I am so suited to rotaries cause I am cheap, my girl friend agrees !

30psiBoost

Incredible man, thank you alot, so basically replace the seals and your good to go?although im a bit sad/depressed becuase a guy down here just sold his 3rd gen right b4 i could get to it, so im gonna be searching awhile more. anyways, i know what your talking about, im in the process of reading "maximum boost" by corky bell, great book so far, youll learn alot. Whats involved in running the engine higher than 7500, a new chip and fuel upgrade, do the stock turbos still boost well up that high? thx

93TTRX7

Stand alone programs allow you to set your rev limiter...you can even set the rev limiter to 0 and your car can't be started, hence it can't be jacked

shinjuku

this is very interesting RICE RACING.

could you pls go into a little more detail about the caculations? Also how this rates with earlier rotors?

Cheers
Andrew

RETed

You basically need a mechanical engineering degree (with a minor in physics and mathematics) to do this.&nbsp If you do, you don't need to be asking.&nbsp Since you are asking, I assume you don't.&nbsp The forces are very easily to calculate if you do have this knowledge.&nbsp I would be surprised if RICE RACING obliges and dumps a whole dissertation on the subject.&nbsp The mathematics are very involved, and it would necessitate a whole shitload of charts and graphs to cover thoroughly.&nbsp I wouldn't bother going through all the trouble unless you're going to pay me $1,000 for a lecture fee.



-Ted

shinjuku

Dont let REted's post put you off Peter

I'm still interested

But yes i should have qualified what i was asking for.

Just a few sentences will do to give a rough idea.....i'm not asking you for a mathematics lecture.......hey i already have to attend too damn many of those now