Spirograph

I'm looking for more information about optimal RPM ranges.

What valves are opened or closed at various RPMs? I know the SEV opens at 7500 RPM, but isn't there another valve that opens up at a lower range, like 3k-4k?

LOW RPM RANGE
I've read a couple of posts by others saying that until their oil is at operating temp., that they shift at 3k. I don't think I could get in the habit of shifting that early, especially in 1st. When taking it easy on a cold start, I tend to upshift at 4k, and downshift at 2.5k. Is shifting at 4k instead of 3k a risk worth worrying about?

HIGH RPM RANGE
The defacto advice here is "redline once a day to decarb". I've been doing that, but I think that I don't want to push it that high anymore since I suspect that it's doing more harm than good. The main point is to get it up to 7500 to open the SEV, correct? I know that the heat produced between 8k and 9k is significant. Do you need to get up to 9k to get the huge heat increase to burn the carbon, or is the heat produced at 7.5-8k significant enough to burn the carbon? If you only run it to 7.5-8k, do you need to hold it there for a couple of seconds longer?

Eelfinn_Ty

I believe the first set of valves open at 3300 rpm.

I don't think the 3-4K enough to make a difference. The rev limit is actually lowered when the engine is cold to prevent any thing from going too wrong.

As for red lining it. If i remember right our rotary engine will rev higher than 9500 rpm with out any issues, but the power gains are minimal. This question reminded me of a youtube video.

http://www.youtube.com/watch?v=kO3lSTO8uWg

StealthTL

iTrader: (1)

It's not the revs, it's the wide open throttle that will keep the ports clear.

Nothing is gained from a simple rev from idle to redline, but the heat and gas velocity of a 100% load can blast those clogs away!

tza0001

iTrader: (2)

Consfused ! In order to redline the 8 you got to let it warm up. Thus, when you redline there is already some heat developed. What do you mean by gas velocity? Isn't gas velocity increasing during accelaration?

Spirograph

Yes, our rotaries can rev past 9k RPMs, but I don't think that repeating this on a regular basis is necessarily "without incident", especially given the extreme level of localized heat generated at this velocity.

So, adding in WOT into the equation, is driving WOT to 7.5-8k RPMs enough to clear the carbon sufficiently, or is it necessary to go 8-9.5k RPMs?

PeteInLongBeach

This should tell you everything you want to know, and more... :

http://www.rotaryeng.net/New-rotary-eng.pdf

Figure 13 shows when each valve opens.