Hey Francis, how is going?
Very soon you going to have Profi to play with!

Look what I got from one of Rev guys. He got P/L set from me and run already 3 gallons through it. Last Saturday on race he got some trouble-first qualifyer he run very good and engine came 250 F after qualifyer, second round everything was perfect till 3 min mark-all of suddne engine start loosing power and finaly flame out. His pit man rushed to car and mesure temp before restart engine and it was 475 F. When I herd this number I didn't belive to my ears. He sad he open the motor and found that only cranck pin is damaged, the rest looks OK (one smal crack on conrod). He asked me to inspect it and rebuild it. When he came to my work he has everything open and clean. I was expecting to see just melted metal, but when I looked I was really surprized-you can see on pics that real damage on cranck pin only-that guy is blue. Small crack on conrd, but it is perfectly round, sleeve has no discoloration at all, piston looks just perfect, fitting-slightly loose but can be use for about 1 more gallon.
I do know durability on our products, but really couldn't expect this much-475F and it is still can be use!
I will not recomend to anybody to run higher then normal temp, but this sample is showing-even if it is happened as accident-it will not be time to cry.
Edward

Hey edward, I was there when it happened to Chris. I could smell the engine pitted two rows down and he looked scared to open it up because that temp of 475 farenheit was after the engine was already shut.

That's pretty impressive durability!

475 F !!! i can almost light my cigarette with it

how about the top of the piston and the dome on the button, no signs of damage ?

Yes you can light u your sigarete there.
Top of the piston and head button slightly sand blasted-glow plug bluw up.

hi ed,
wy did the engine goes up to this temp,
bevor she goes good??
dieter

Hey Dieter.
i really don't know, I wasn't at the track that day. I found, that, o-ring for carb underneath was busted-one of the probable cause of leaning, also might be something else went wrong. I nkow this particular engine I put together about 4 month ago and Chris run it more then 3 gallons and he is very pleased with performance and service, so he came back to me to rebuild it.
Edward

Maybe the pressure line from the pipe broke or the tank lid didn't close completely.

I have seen something similar recently, but this engine didn't survive

Edward, are you going to give me an answer to my PM question?

Dieter, unfortunately we will not make it to you 3 hour night race. Our third man has gotten cold feet

I would have loved to race in Serpent/Magic country with my Mugen

It happened here once. The BRB was running fine during the race but he flip and got stuck to tires on the track, the engine kept on rev'n.
The mechanics got the car and he continue the race for one lap later, the engine stop and measured the Temp was 198C !!!
Changed plug, cleaned the engine, the crankpin was bit worn but He is still using the same engine today

hi stefan,
cold feed , in 200 mm sedan cars it is team magic land,
i think we ave around 20 with g4, and 7 with 710
on our track.

dieter

Ich kann Dir sagen, alles Maedchen hier oben im Norden.

Der hat Angst er koennte seinen Motor ueberanstrengen

Zum Glueck zieh ich bald zurueck in den Sueden.....

hi stefan,
wieso motor überlasten,
im finale fähr man doch auch bis zu 40 minuten,
wenn man 2 x 30 minuten fährt macht das dem motor nichts
dieter

I have been testing head clearance for the last few weeks on BRB and Bi metal. I have came to conclusion that in HK, 30C & 80% Humidity, the best is around 0.65 to 0.7mm head clearance which produced the best overall power for 30% .
I actually have problem with 0.5mm head clearance. The needle was too sensitive and no top end. I was using Odonnel 97T plug and can't tell from reading the wire (may be Odonnel plug too good )

Kitracer, you're .7mm measurement is piston to button right? Not thickness of shims. So your .7mm measurement will be around .4mm thick shims.

Musst Du mir nich erzaehlen!!

Deswegen sag ich, alles Maedels hier oben