Keith's red S3

[codge]

I thought it was a sump feed to the OMP Thomas......oil then pulling up the pipes by carburettor vacuum?
(Every schoolboy knows that vacuum doesn't pull at all, it's the atmospheric pressure that pushes into a vacuum space - but you know what I mean).

So is there oil feed pressure at the standard 12A OMP?

[ian65]

the OMP is driven by a gear off the eccentric shaft.... the actuator rod going to the carb opens the valve in the pump which lets oil through according to engine revs

[spirit r]

So is there oil feed pressure at the standard 12A OMP?

Yes! Feed is from the engine oil circuit.

OMP feed.png (65.77 KiB) Viewed 5659 times

[codge]

OK, thanks for that guys.

[myatt1972]

When I did the 2k rpm for 6mins test it delivered well over 2 - 2.5cc and as I have my omp oil lines going directly to the IDA manifold I suspect the vacuum pulls even more. I have had a good drive today and it is using a decent amount of 2 stroke oil so I think I'm ok.
Thanks for the info Thomas, I thought the oil feed to the omp was on a return

[DKWW2000]

What kind of 2 Stroke are you using Keith?

[ian65]

I have had a good drive today

Went to a classic car show today and as usual, the best cars were in the car park....







.

[myatt1972]

I was looking for you Ian but didnt spot you.
Was a good show with a huge mix of cars, as usual I didnt take any pics but had a good chat with a bloke about his Standard flying eight, I want one

[ian65]

we were there for about 3 hrs.. pretty good show this year

[myatt1972]

I had a pressie for you to, you will have to wait till RR now !