Average Exhaust Temps of a Rotary?
 

Can anyone give me the highest they know of exhaust temps for a rotary?

Stock twins with downpipe
Single Turbo
N/A 13b
n/a 13b with NOS

This is for my temprature device Im working on but looks like I may have to get a bit tougher material for the EGTs.

THANKS

I've seen 1,150C highest.
13BT, super lean cruise @ 4kRPM


-Ted

Anyone else got some temps? Thanks for Your Input

the highest I have ever gone with my car is a little over 800 with an rx6 single turbo

Farenhite or Celsius?

celsius.

1450 deg F is common, most even higher on NAs.

You can only get a better reading on your EGT after driving hard on the track, or hard on the throttle for a longer period of time. It will become more consistant, since the temperature tend to build up a bit.

1900F i've heard they can get higher. thats why we use thick SS

= 2100F


-Ted

13B PP with Carb I'm running 1560 at 9800rpm with a 245 main jet and 1460 with a 260 jet, you want to be between 1400 to no more than 1600. I had run up to 1750 with my turbo but blow up quite a few turbo at that heat. To lean

SCCA 12A NA bridgeport road racer . rpm band 7-10,000 rpm. we always tuned for 1750 degrees in top gear.

howard coleman

13B PP on 93 octane at 10.5K rpm-------> 1700 deg. F. measured 10 inches from exhaust port. Same motor on 100% Methanol fuel---> 1400 deg.

695 RWHP 13B turbo at 9000 rpm----> 1600 deg. measured 6 inches from exhaust port.

What A/F ratio are u tuning for?

For curiousity's sake, what AFR's make up "super lean"?

Interested thread. I am just about to go single and thought I would install a couple of EGT probes at the same time. One front, one rear because I want to see what the difference is.

Fish

Yes I'm curious what you consider that also...

Piece of shit A'PEXi TT read-out off a narrow-band O2 sensor showed 16.0:1.


-Ted

What afr have you seen damage occur on a lean cruise? I don't want to find out the hard way going beyond 15:1 afr on cruise...

I wouldnt go beyond 14.5:1 afr on cruise.

Fish

Then you're wasting gas...

I wouldn't go any richer than "just enough fuel to prevent misfiring" on cruise.

Which, with the rotary's mixture-insensitive chamber, is REALLY REALLY LEAN.

Of course I've had fuel issues that caused me to go lean enough to misfire. Had to drove 20 miles home that way after attempts to solve the problem on the side of the road failed. Burned out my Genuine Mazda exhaust manifold gasket (!!!) but the 16-gauge mild steel headers were fine (!!!!).

Note that extended running at stoich will hurt your cats. No OEM runs at stoich for more than a minute or two without a small rich "burp" to cool them off. Rotaries are worse because of the higher EGT's we get with our inefficient combustion even when everything is "right".

where is the EGT probe mounted!?!?
Is there some universally agreed upon mounting spot that I am missing out on???

I don't understand how everyone can start throwing out numbers when it is QUITE possible that their EGT sensors are mounted in different spots.

I currently have my FD in bits fitting my single turbo kit. The picture attached shows where my EGT sensors will be mounted.

As for a running at stoich hurting my cats. What cats, the furry ones in the house? ;)

Fish

I think on NA . no more than 15 in ? from port area. I plan to mount my at 13 inch area. on turbo better mount before down pipe. other wise you reading will be too cold

Get the EGT probe as close to the exhaust port as possible.
There is a lag time involved, so the closer they are to the exhaust port, the faster it'll react.
The downside is that the probe better be able to handle those heat ranges.

A compromise position for turbos is in the downpipe when using a divided turbine.


-Ted