2000M racer engine failure at high revs

[Soldaat van O.]

soundclip 2000m Racer

We did some testing with our 2000M racer (Soldaat van Oranje) in Blackpool aan den Rijn
When high revving on the long straight just after the HEMA corner the engine has a slight failure. We made a soundclip of it. Can anybody tell what the problem might be?

[vixen]

I think the engine misfires a bit. Is it running on all it's cilinders?

[Soldaat van O.]

vixen said:

I think the engine misfires a bit. Is it running on all it's cilinders?

We checked every sparkplug.. seems fine

[infinity]

Are you really sure you checked BOTH the spark plugs?

May be it's accidentally in the interval Mode?

[Soldaat van O.]

infinity said:

Are you really sure you checked BOTH the spark plugs?

May be it's accidentally in the interval Mode?

2000M racer engine/exhaust check

Of course we checked both plugs.... the one in the middle we double checked.

Cantus had a look at it and he thinks it has something to do with the exhaust as you can see in the vid.

[GreenV8S]

It sounds glorious especially in stereo.

I don't know anything about that engine, but on the video it looks as if it's on sidedraft carbs?

The sound clip seemed to show the engine running cleanly for a few seconds at the start of each straight and then starting to miss. Is it possible you're getting fuel starvation under hard acceleration? It would run for a few seconds on the contents of the float chamber even if the pumps weren't delivering fuel. Depending what the fuel/ignition systems are that could be complete rubbish, perhaps you could describe the setup?

[Seabass]

Maybe one or two or three of the four magnetos were shorting inside themselves once the sparks grew too frequent with rising revs.

[Terminator]

I'd replace the flints.

[infinity]

zouden die gasten het echt geloven?? dat kan toch bijna niet? Maar ja, die gasten zijn ook in Engeland gemaakt, dus waarschijnlijk zijn die oren kapot.

[Soldaat van O.]

infinity said:

zouden die gasten het echt geloven?? dat kan toch bijna niet? Maar ja, die gasten zijn ook in Engeland gemaakt, dus waarschijnlijk zijn die oren kapot.

We leven in een gekke wereld, op een eiland in de Noordzee in het bijzonder.

[Soldaat van O.]

GreenV8S said:

It sounds glorious especially in stereo.

I don't know anything about that engine, but on the video it looks as if it's on sidedraft carbs?

The sound clip seemed to show the engine running cleanly for a few seconds at the start of each straight and then starting to miss. Is it possible you're getting fuel starvation under hard acceleration? It would run for a few seconds on the contents of the float chamber even if the pumps weren't delivering fuel. Depending what the fuel/ignition systems are that could be complete rubbish, perhaps you could describe the setup?

It is a 2.0 litre ford pino engine with dellorto sidedraft carbs, hot camshaft, custom headers and manifold. We run it on a gas/methanol mixture

[GreenV8S]

Do you monitor the fuel pressure? If not, that would be worth adding.

[Soldaat van O.]

GreenV8S said:

Do you monitor the fuel pressure? If not, that would be worth adding.

There's just one on/off switch for the fuel pump. maybe we should add a pressure gauge

[Slow M]

[edit]: Previous post removed due to exessive nonsense! [/edit]
Sounds like fuel is shutting of randomly!
Have you checked electrical connections to the pump or tried a spare?
Have you removed the Dellortos and cleaned them?
Have you cleaned the tank/fuel lines/pump?
Could it be a loose electrical connection somewhere in the ignition system?

How high do you rev that crazy beast?

Good luck,
BH

Edited by Slow M on Friday 21st November 20:56