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Re: Keith's red S3 (was James's)
Posted: Sat Aug 08, 2015 12:13 pm
by 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?
Re: Keith's red S3 (was James's)
Posted: Sat Aug 08, 2015 8:39 pm
by 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
Re: Keith's red S3 (was James's)
Posted: Sun Aug 09, 2015 5:39 am
by spirit r
codge wrote: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 5665 times
Re: Keith's red S3 (was James's)
Posted: Sun Aug 09, 2015 11:08 am
by codge
OK, thanks for that guys.
Re: Keith's red S3 (was James's)
Posted: Sun Aug 09, 2015 9:00 pm
by 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
Re: Keith's red S3 (was James's)
Posted: Sun Aug 09, 2015 9:10 pm
by DKWW2000
What kind of 2 Stroke are you using Keith?
Re: Keith's red S3 (was James's)
Posted: Sun Aug 09, 2015 9:35 pm
by ian65
myatt1972 wrote: 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....
.
Re: Keith's red S3 (was James's)
Posted: Sun Aug 09, 2015 11:18 pm
by 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
Re: Keith's red S3 (was James's)
Posted: Sun Aug 09, 2015 11:29 pm
by ian65
we were there for about 3 hrs.. pretty good show this year
Re: Keith's red S3 (was James's)
Posted: Sun Aug 09, 2015 11:42 pm
by myatt1972
I had a pressie for you to, you will have to wait till RR now !