Engine problems...

[Devils speedshop]

I know that 12,5 is not the perfect AF let say ideal/ in the mittel of the tolerance the safe place.

I know if you go higher you get HP.

But as long as my engine is not running above the 5000 rpm i cant jet it.

Christian Ulberg

[Jee Ent.]

Sorry to hear this. Hope you fix it. This is a beast of an engine... 


I can't see you specify it. But is your lambda reading stabil OVER 5000rpm also?

[OliveRS]

Any videos of the dyno pull ? hearing it will be very helpfull for people to help you .

[Udo]

I hope he gets it ready for the weekend ...

Udo

[dangerous]

I know if you go higher you get HP.

Christian Ulberg

Hi Christian,
with your different fuel,
you need to try higher AND lower
to see which A/F your particular engine needs.

For example I would not hesitate to try as rich as 11:1
to see which direction to head.

The reason for this,
is some induction systems do not have the good atomisation needed
to support leaner mixtures,
or as I found with my own engine,
inadequate exhaust scavenging needed a richer setting to avoid power loss.

But for safety,
 I would not go leaner than 12.5 personally,
but as discussed above,
some sensors may be used only as a "tool"
to detemine what YOUR combination NEEDS.

You also must try less ignition timing, particularly at higher RPMs.

Out of interest, is your quoted HP an "at the wheel" figure that you have converted to flywheel HP?

[Devils speedshop]

About the A/F until I have the thing solved with the ignition hopeforly I can't realy try to do the jetting, i need to be abel to see the curve all the way up so I can see how lean or rich it runs in the end when its max out. don't worry about that we will try diffrent jetting when that time comes as it is now I just need the engien going pass 5000 rpm and still claim the curve, and as I can read I sure its noise or the Distributor.

The dyno calc. the engine HP and the wheel HP

But should have been on the dyno today this morning so i chould race this weekend, but the mail delivery fucked it up yesterday so no parts befor today, so no racing, and im going to china in 14 days to work every 3 week so if im lucky it might be SCC where ill be doing my test drive, if im not in China, or else I have to wait until next seson..

Christian

[Udo]

I can make you an offer to do the jetting on the track this weekend. i have all jets in the trailer also emulsion tubes

Udo

[Devils speedshop]

Thx Udo

But ill have to take a pass on that, I need a few days without racing right now.

Christian

[Udo]

Get it ready for next weekend and come to Bitburg . Best chance for test and tune ... We are all there


Udo

[Udo]

No news about the tuneup ?

Udo

[Devils speedshop]

Hey udo

Very bad news.....

1: the engine only made 300 hp it diden't look like it whould deliver anymore..

2: when we dynoed it the last time.. At 7200 rpm hell broke loss.. I have not takeing the engine out yet because i been to China for 3 week to work, but at the dyno guy we look inside cyl 1 and the exhaust valve hed where smashed into the exhaust chanel, and the sparkplug is also damage very hard... So im not so happy about it and I im specialy not happy about this being a low maintence engine and then this shot happens.. I can say it will not be this year ill be racing.. Again.. If i ever get out on the race track again, money and the fun about it is not that much right now.

Christian Ulberg

[bang]

that is bad news.. lets have a talk when i come home.

op på hesten igen..

[Udo]

Are you shure it did not run too lean at the first dyno session ?  Bad news , feel sad about it ...


Udo

[Devils speedshop]

Yes im 110% sure it run safe all the time.

Yes its a big set back for me, no what you want after waiting 2 year to go racing again. Now ill have to wait another seson..

Christian Ulberg

[Basti]

Sorry for that ;(

Basti

[Udo]

Remember what i told you at bitburg 2 years ago .
Hope to se you this year as a mechanic ...

Udo