pmr eng

Hi,
Just wondering what spark plugs, EGT's and ignition timing do you recommend for a rotary engine running hi boost and methanol?

So far I have this as my starting point

EGT's 800ºC (1472ºF) to 850ºC (1562ºF)

Ignition Timing

35-40 degrees vaccum
30 degrees a 0 psi (gauge pressure)
25 degrees @ 15psi
18-20 degrees @ 30psi
ramping down to 10-12 degrees @ 45psi
and 7-8 degrees 50 and more psi.

Your input would be of great appreciation
Cheers!

mad20b

Good luck getting anywhere 800 deg EGT on meth! Timing looks a little (lot) advanced for my liking too.

I doubt you will get too many people giving you useful information on meth - most workshops etc dont give away too much! As for plugs, the norm seems to be R6725 - 115s but I think these are too cold... Also on meth, it seems to like it a lot richer than petrol - around lambda .7... I guess you just have to get it on the dyno & have a play!

pmr eng

Hi,
Thanks for the reply
I will be going with the Trust/Greddy Racing Plug Pro RE10 Spark Plug
What EGT's will I be getting?
The less timing = higher the EGT temps
I have noticed alot of piston guys running higher than 800 deg
Would something like this be more apparent?
25-30 deg vaccum
25 deg a 0 psi (gauge pressure)
12-15 deg @ 15psi
8-10 deg @ 30psi
4-6 deg @ 45psi
1-3 deg 50+ psi.

I'll be aiming for 5-5.5 AFR, stoich for meth is 6.4

mad20b

depends what the engine likes really. if it was as easy as just throwing some numbers at it we would all be running 6s! That timing does look a bit better though.

I prefer to use lambda as it is a true representation of what is happening. Lambda 1 is stoich, Lambda .9 is 10% richer than stoich, lambda .8 is 20% richer etc. 5:1 is Lambda .78. Way too lean in my books - but hey - try it & see, your motor might like it! .70 is 4.5:1 FYI.

pmr eng

thanks for the info
At least I have a point to start from

When I was at the summernats (car festival) dyno comp this year I noticed this car http://www.youtube.com/watch?v=9TCzt-Se-Wg
was running on methanol and they happen to have a probe in the exhaust. I never saw a AFR as smooth as this cars, perfectly flat on 5.5:1 AFR. I figured that would be a good AFR to aim for, the car did make almost 2000hp at the wheels.
I'll start off going a little richer 4.5:1 and go from there.

pmr eng

Anybody else have information they'd like to share....?