Anyone recall late oil level mod to timingcase?

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Vincent.vanGinneke
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Anyone recall late oil level mod to timingcase?

Postby Vincent.vanGinneke » Fri Apr 17, 2015 11:41 pm

In the knowledgebase there is a article by the late Bob Brassington on raising the level in the camshaft department on singles.
It involves making a -copper- pipe connecting the crankcase to the timingchain case.

Now.....I think someone once came up (or was it the factory?- ) to fit a gasket between crankcase and camshaft housing that covers almost half of this round camber in such a way that it raises the level to bottom camlobe.
Did this happen or is it a Idefix by me ?
And if does it work?

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Re: Anyone recall late oil level mod to timingcase?

Postby nevhunter » Sat Apr 18, 2015 1:48 am

The approx 1/4 hole that allows the oil to drain into the main case could be raised to advantage. Oil would also return around the mainshaft through the timing side ballrace although an extra bronze bush has been placed there in some engines I have seen.. Nev

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Re: Anyone recall late oil level mod to timingcase?

Postby adrie.degraaff » Sat Apr 18, 2015 5:29 am

Vincent.vanGinneke wrote:It involves making a -copper- pipe connecting the crankcase to the timingchain case.

I am using this system and is working well, some gasket sets have them in, so it came of some factory.

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Re: Anyone recall late oil level mod to timingcase?

Postby robjameson » Sat Apr 18, 2015 8:56 pm

I actually have an ex Bob Brassington bottom end on my vh, which runs a bent copper tube from the back of the timing case to the drain in the cam case, effectively blocking it, it then has a hole drilled through to the crankcase much further up, forcing the oil level to be higher.

It just runs standard gaskets.
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Re: Anyone recall late oil level mod to timingcase?

Postby Vincent.vanGinneke » Sat Apr 18, 2015 11:56 pm

I realise that I will have to refrase my question (free to Harry Belafonte)

Does someone use a gasket like outlined in red ?
(low oil drain hole needs to get closed of)
What happens is that the oil level raises behind the gasket, and reaching the bottom of the camshaft lobe .
shown line is maybe a bit low and level of gasket rim also depends on if you use a twin lobe or later single lobe .

artfully visualised below.

And if so, does it work? or is there a risk of mushing up the paper in some way ?

P1260547.JPG

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Re: Anyone recall late oil level mod to timingcase?

Postby adrie.degraaff » Sun Apr 19, 2015 6:28 am

Vincent.vanGinneke wrote:Does someone use a gasket like outlined in red ?

That won't work becouse you raise the oillevel at the magnetochain too making an oily mash, the coppertube will return that oil.

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Re: Anyone recall late oil level mod to timingcase?

Postby adrie.degraaff » Sun Apr 19, 2015 6:42 am

robjameson wrote:I actually have an ex Bob Brassington bottom end on my vh,


I don't think Bob invented that becouse I found NOS gasket sets with the copper tube in it.
The downside is; you"ll have to take the crankcase apart to drill the new oillevel hole.

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Re: Anyone recall late oil level mod to timingcase?

Postby robjameson » Sun Apr 19, 2015 7:50 am

No, I think the factory messed around to try to reduce the wear on high lift cam models, but the bottom end I know came from bobs workshop when it was cleared after his untimely death. When I first took it apart with dad, we discovered the oil mod, but it was running a standard gasket, albeit made from rubber for some reason.
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Re: Anyone recall late oil level mod to timingcase?

Postby brenton.roy » Sun Apr 19, 2015 8:00 am

Hi Vincent,
As with Adrie, I don't think a gasket alone would work.
You can block the lower hole in the crankcase (where you have x), but then need to drill a new drain hole, or the oil level will be too high around the cam.
Oil will then get in through the drain hole to the left of the oil pump (instead of out) and over fill the outer timing cover - no doubt exiting via your magneto... ;)
Aka - a mess.
This is the point of the bent pipe - it keeps the oil level low in the outer cover (by letting it drain to the flywheel cavity) while allowing oil to cover the cam lobe (by blocking the old low drain hole) with the level set via the newly raised drain hole.
While Adrie is correct about needing to split the cases to drill the new drain hole, most of the swarf will go toward the drill. If you were really stuck, contamination could be minimised by drilling very carefully, with grease on the end of the drill bit - and careful washing with the sump plate off.
A more elegant, straight pipe solution would be good, as the bent pipe is a pain to fit. Another thing to take into account if getting creative, is that the bend of the pipe stops it moving in and out (toward or away from the flywheel).
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Re: Anyone recall late oil level mod to timingcase?

Postby adrie.degraaff » Sun Apr 19, 2015 8:21 am

brenton.roy wrote:A more elegant, straight pipe solution would be good, as the bent pipe is a pain to fit. Another thing to take into account if getting creative, is that the bend of the pipe stops it moving in and out (toward or away from the flywheel).


The bent pipe is solid in to the outerdeck and sliding in the crankcase half.


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