If you like our site, please consider joining our club!
By joining you will help ensure that we can continue to provide this service
JOIN HERE!

Second petcock

Post Reply
weh8127
Posts: 257
Joined: Tue Jan 16, 2018 11:28 am
Been thanked: 20 times

Second petcock

Post by weh8127 »

Anyone have experience with adding a second peacock to a SM sport tank that has to be painted anyway? This is a conversion rig with an R 75 engine and I'm worried about sufficient gas flow under load with a heavy sidecar and passenger. Anything special I need to know?
Many thanks.
Bill Husted
Barre, MA
1973 R75/5
1967 /2 with R75/6 drive train conversion
Steib TR500 sidecar (new)

kmev
Posts: 5
Joined: Mon Nov 13, 2023 5:25 pm
Been thanked: 1 time

Re: Second petcock

Post by kmev »

You should place it a bit further outboard than the original bung to ensure sufficient clearance with the engine. The crossover tubes were originally brazed in. I didn't remove paint to confirm if the original bung was also brazed. I brazed the new bung in no problem. Instead of fully removing the crossover tubes and then having to plug a large hole in sheet metal, I cut the tubes close to the tank, made tapered steel plugs, and then brazed those in.

IMG_20240909_181909370_HDR.jpg

User avatar
niall4473
Posts: 249
Joined: Mon Apr 09, 2007 2:54 pm
Location: U.K.
Has thanked: 3 times
Been thanked: 31 times

Re: Second petcock

Post by niall4473 »

I just gas weld the new stabbing on and weld up the holes for the crossover pipe, no problem at all.
Oil is always cheaper than metal

weh8127
Posts: 257
Joined: Tue Jan 16, 2018 11:28 am
Been thanked: 20 times

Re: Second petcock

Post by weh8127 »

Did you fabricate the bung or are they available pre threaded?
Bill Husted
Barre, MA
1973 R75/5
1967 /2 with R75/6 drive train conversion
Steib TR500 sidecar (new)

weh8127
Posts: 257
Joined: Tue Jan 16, 2018 11:28 am
Been thanked: 20 times

Re: Second petcock

Post by weh8127 »

Bill Husted
Barre, MA
1973 R75/5
1967 /2 with R75/6 drive train conversion
Steib TR500 sidecar (new)

kmev
Posts: 5
Joined: Mon Nov 13, 2023 5:25 pm
Been thanked: 1 time

Re: Second petcock

Post by kmev »

That should work. This is where I got mine: https://www.bungking.com/20mm-petcock-b ... MjVp4X-H6Q

Post Reply