Thumper Club Forum

Technical => Project Progress => Topic started by: JOOLZ on June 19, 2013, 05:45:25 PM

Title: Crankcase vacuum valve
Post by: JOOLZ on June 19, 2013, 05:45:25 PM

I bought myself 2 one way valves for my engine breather, they create a good vacuum in the crankcase, makes a huge difference to oil control and even a very tiny hp improvement. I had 2 very small oil weeps, one on the rocker cover gasket and one on my clutch mount, they have disappeared now  thanks to this mod.
I think it would be a good mod for all single cylinder bikes

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Title: Re: Crankcase vacuum valve
Post by: JOOLZ on June 21, 2013, 10:18:31 AM

Link to some info  http://www.nortonownersclub.org/support/technical-support-commando/crankcase-breathing

Title: Re: Crankcase vacuum valve
Post by: guest1683 on July 22, 2013, 06:20:30 PM

Joolz you replaced your oil feed to the head with a big bore job.
Can you tell me what fittings and pipe you used as i am very interested in this mod.
I have tried every plant hose,motorcycle and auto store in the north of Ireland and i get the same reply "we dont sell anything that small"
sorry for jumping in of topic.
although ill be looking into this mod also.
Thanks for the tip.T.

Title: Re: Crankcase vacuum valve
Post by: JOOLZ on July 23, 2013, 08:52:45 AM

Hi to make up the head pipe you will need 1 m8 banjo for 5mm hose fitting, a length of 6mm stainless braided hose, 2 dash4 hose clip finishers and a m8 90 degree banjo for 6mm hose, all obtained through ebay