Jump to content

Sign in to follow this  
howard

Best Villiers 32a Exhaust, Expansion Box/silencer ?

Recommended Posts

Do any of you boffins know what is the best exhaust system for a 32A Villiers trials engine and where to get one? Is a true silencer better than an expansion box? What sort of packing is best? Does length matter!!!??

Thanks in anticipation.

Share this post


Link to post
Share on other sites
 

 

I have experimented with various exhausts for my 32A Villiers Greeves as I have the same problem trying to find a replacement silencer here in the USA. I found that without an expansion chamber the bike ran flat as a fart. No power band. My original tin exhaust can was so loud (even with new wadding)that it deafened me and everyone within a 2 mile radius and was annoying to ride see ...... http://greevesmotorcycles.blogspot.com/

I have therefore decided to put on a NOS pipe designed for an early 70's Yamaha enduro (DT250)and fabricate a new header pipe. I will post some photos once I have finished it next week.

To make matters worse, here in the US there are noise regs for offroad bikes (below 98 dbs)and I have to fit a spark arrester to prevent wildfires. I would be interested to find out what solution you came up with together with a photo.

Cheers,

PS Villiers Services do not stock anything to fit.

Share this post


Link to post
Share on other sites
 

I have experimented with various exhausts for my 32A Villiers Greeves as I have the same problem trying to find a replacement silencer here in the USA. I found that without an expansion chamber the bike ran flat as a fart. No power band. My original tin exhaust can was so loud (even with new wadding)that it deafened me and everyone within a 2 mile radius and was annoying to ride see ...... http://greevesmotorcycles.blogspot.com/

I have therefore decided to put on a NOS pipe designed for an early 70's Yamaha enduro (DT250)and fabricate a new header pipe. I will post some photos once I have finished it next week.

To make matters worse, here in the US there are noise regs for offroad bikes (below 98 dbs)and I have to fit a spark arrester to prevent wildfires. I would be interested to find out what solution you came up with together with a photo.

Cheers,

PS Villiers Services do not stock anything to fit.

Looks like your present exhaust would not have any significant back pressure,Stinger(tailpipe)is far bigger than even a 500cc two stroke would need.When I was a kid we'd yank the baffles out of our trailbikes and have dad weld a washer with a 3/4" hole at the end of the exhaust,they'd run fine(not better than originally baffled,just louder!)If you want to keep the cool old Greeves look install a J.C.Whitney baffle into the tailpipe and experiment with different size washers to adjust the back pressure,be cautioned that if it starts to run great with alot of top end zap it may overheat the piston and kill it.

IMG_0681.JPG

I'm no two-stroke exhaust expert as far as design engineering but I'd try gutting that muffler into a open chamber and then integrating a conventional two stroke silencer core inside a big tailpipe for a vintage look.

JCW has these specifically for two-strokes(made by pertronix)1 1/2" outside diameter

G_16238G_CL_1.jpg

Conventional Expansion Chambers are not necessary,and might be counterproductive as they are tuned to specific power ranges,personally,when I rode Harescrambles the only time I noticed and power loss from a dented pipe was when I mashed my KTM headpipe down to a half-inch wide against the ignition cover :icon_salut:

Share this post


Link to post
Share on other sites
 

Also,if I ever get a bike with earl's forks I want to add slotted axle mounts and snail cams to them so I can adjust the trail until steering's perfect.(surely someone's done that already though)

Edited by htrdoug

Share this post


Link to post
Share on other sites
 

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

Loading...
Sign in to follow this  

×
×
  • Create New...