Square four pressure problems again

[john.whiting]

The plug could work OK by drilling either one central hole,or a number of small peripheral holes.......A central hole would be easier ,just so it was smaller than the spring ,and the spring could seat on a ledge ......the release pressure would have to be set by trial.

[john.whiting]

Make sure the end of the crank isnt cross drilled to flow released oil away.

[GuyWalton]

Should look very similar to this one .

[FletchBurton]

Hi All,
Thanks for your replies and pics. I went and visited Lester and he has lent me the very thing. I put it on the bike and turned it over on the paddock starter... And got 80ish PSI on the gauge with oil coming past the valve in the prescribed manner. So the problem is solved. Just need to make a copy of the valve I have been lent.
Cheers,
Fletch

[Paul_Linden]

Should look very similar to this one .

Guy, I thought that picture looked familiar - it’s one of my bike.

[FletchBurton]

Hi Paul,
What is the purpose of the extra bit of plumbing in Guy's picture.
Thanks,
Fletch

[GuyWalton]

Should look very similar to this one .

Guy, I thought that picture looked familiar - it’s one of my bike.

I think you sent it to me when you were educating me about the spray bar . Hope you dont mind .

[Paul_Linden]

Guy - no problem, I’m happy to see the picture get recycled.

Fletch - the narrow copper pipe is the oil feed to a cam spray bar. It drops oil on the cam lobes.

[Paul_Linden]

Here is a post with more about a square four cam spray bar:
http://forum.arielownersmcc.com/viewt ... =4&t=11840

[FletchBurton]

Thanks, I see what it is for now.