The V8 Owners Forum -

In my case the engine was modded to a radical amount by John Eales with a JE102 cam……huge overlap!

It ran extremely well and pulled like a train 2000 to 6800 where it cut the spark.

Problem was on the road where the box ratios put the revs 1200 to 1800 and in these reeves it was a bucking bronco ...

This is what my tune resistor looked like……different colour as I did not have cats, but that was CUX ecu
https://powersperformance.co.uk/store/slug/tune-resistor-cat/

You could buy something like this and change the resistor to the correct value!
I also thought I may try a variable resistor so ...

Take the hose off the carb and block it / clamp it then try to see if it is still smoking!

Basically remove the vacuum.

Best to put the end of the hose in a plastic bottle and collect anything that comes out as it may still throw out oil. You should can also feel any draft coming out as this will ...

Do your valve cover breathers go to a port on the carb?
If so is it the full vacuum port that will suck everything through it and then feed into the cylinders? (Brake booster port?

The breathers normally run to the underside of the air filter housing so not trying to draw a huge vacuum

This has come up a few times over the last 20 odd year on this site.

The serpentine does not need Vaseline packing
Cranking speed is not high enough to spin the pump fast enough
General consensus was to start the engine and oil pressure should arrive almost immediately.


But don’t take my word on ...

The GT40 fraternity have had good work from Tony Banks
https://www.tonybanks.co.uk/

A couple of other things came to mind.
1Hydramat

2 for your oil system a dry sump as at 45 degrees I bet the standard pickup is catching air!

Ian

A bit late to the party here!
That event sounds and looks epic!
Way back in the dark ages 1980 ish my brother did a lot of model aircraft building and flying and they used to have a similar problem when doing aerobatics in that the fuel pickup and fuel would be indifferent areas of the tank.
They ...

You have it that far apart and if I was in the same position I would definately have the valves out and check them for bends and also check the seats for pitttimg etc and lap them in again.

The piston shot seems to show a lot of oil in the 9 o’clock position.

Turn the engine over ….spanner on ...

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Well that is how I did this dog!

For a while on my GT40 I had the pipes looped as you mention….worked ok but the engine temperatures swung quickly…basically circulating fluid without going through the radiator! Mine 3.9 with Hotwire ignition system from Morgan

I made up a connector with a restrictor therein with about a 3 mm hole ...

Brilliant news Dave


Thanks for all your work in keeping the forum running

Regards
Ian

Proviso….I have never had an engine on LPG nut numerous other things running from cylinders.



Is the gas cylinder / regulator freezing up?

Leaving for a long while to restart would point me in this direction as everything returns to ambient temp.

Perhaps a change in supplier of your lpg supplier ...

Good morning

That picture looks like a single 4 barrel carb.

If this is the is the case I believe that the ports on the carb are not meant for this extraction work.

The more usual venting point is to the base of the air filter

Ian

Check if the relays click when you power up…..chances are the relay has failed / not connecting in the socket.


Or one of the earths has come disconnected and once cranked being back fed through another system

Would be my guess

Ian