My error, My '68 Commando has the earliest type of Production Racer silencer brackets which are stepped, not the standard ones,The first commandos had stepped silencer brackets as standard. Have we gone in a full circle?
My error, My '68 Commando has the earliest type of Production Racer silencer brackets which are stepped, not the standard ones,The first commandos had stepped silencer brackets as standard. Have we gone in a full circle?
The first Commandos had Atlas silencers!The first commandos had stepped silencer brackets as standard. Have we gone in a full circle?
D Ports as done by Mez. Not sure how far back they date, possibly even 1970s, also done with bathtub combustion chambers.Just use what you need. No issue if there are two or whatever is required to tighten the exhaust properly.
It's interesting how in the old days we use to smooth out inlet and exhaust tracts to a polished surface but now people engineer in reverse cones and stepped headers to control reversion. Look at the exhaust ports of the new Fullauto type cylinder heads.
The most important thing is no leaks.
You got a pic of the Mez combustion chamber Steve ?D Ports as done by Mez. Not sure how far back they date, possibly even 1970s, also done with bathtub combustion chambers.
Second pic is Australian made Fullauto bought via Mick Hemmings in 2014.
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I do, though the link that Pierre-Francois (marinatlas) has included will get you more info about Mez' work.You got a pic of the Mez combustion chamber Steve ?
That looks very good to me, interest about the carburation and swirl tho…I do, though the link that Pierre-Francois (marinatlas) has included will get you more info about Mez' work.
I understood Mez did work for Mick Hemmings, though Mick never mentioned that to me. I am pretty sure that is why there is a pic of Mick's Commando on the Mez website Norton section. I am also pretty sure he actually did some reclamation on my short stroke head after I dropped a valve in about '77 or '78.
I think I am correct in saying that John, (Seeley920) actually has a bathtub head. I am also pretty sure he told me that the major issue was setting up the carburation, to the point that he put it to one side! My assumption is that although you get lots of compression, you lose flow/swirl/burn patterns around the chamber.
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I have the Emgo headers and originally put them on with no washers but found out that the timing side pipe kept coming loose.Put one crush washer on both sides and no problems whatsoever since. I also use the hi-temp RTV sealant on the roses.Hi to all, reviving this thread with a question: I am using standard 850 rose nuts with the Emgo non-balanced header set. Fully tightened, without any washer, there is rocking and room. With a single washer, slightly tighter, but with two I think I can tighten fully. So:
= I assume two washers, flat sides back to back, dome side one towards head, one towards pipe, for maximum seal?
= Has anyone introduced RTV hi-temp coating on these washers? Would that help the seal?
= Where may I purchase half-width rubber supports 06-0622 to tuck my exhaust pipe closer to the mounting / Z plate? I have searched RGM and elsewhere but no luck
Thank you for your replies!
The hemi chamber shape has no squish and generaly needs more timing advance (Hemi V8) ,adding squish can help with tumble and swirl and give a more homogeneous mix of air and fuel , for a more complete burn .That looks very good to me, interest about the carburation and swirl tho…
RTV high temp copper gets smeared around every ex. port retaining/seal surface every time the header pipe/s need refitting . Stuff's amazing .Hi to all, reviving this thread with a question: I am using standard 850 rose nuts with the Emgo non-balanced header set. Fully tightened, without any washer, there is rocking and room. With a single washer, slightly tighter, but with two I think I can tighten fully. So:
= I assume two washers, flat sides back to back, dome side one towards head, one towards pipe, for maximum seal?
= Has anyone introduced RTV hi-temp coating on these washers? Would that help the seal?
= Where may I purchase half-width rubber supports 06-0622 to tuck my exhaust pipe closer to the mounting / Z plate? I have searched RGM and elsewhere but no luck
Thank you for your replies!
Myself I get everything fitted with no tension moving the rear mounts so the rear rubbers are lined up as straight then tighten the roses while checking the rear and then tighten the clamp on the silencer to header. I like to use the barrel clamps from Paul Geoff on this connection.Other vendors sell these also.My rear rubber mounts have stayed good for some time with everything tightI plan on just barely nipping the clamp so it won't move about and count on the lack of back pressure to prevent any leak. A hand over the end of a running bike's muffler would expose any leak I'd think?
Hi all, question on the stepped exhaust bracket 06.1721/S from AN. Using this bracket means routing the rear brake cable another way.
Hi all, question on the stepped exhaust bracket 06.1721/S from AN. Using this bracket means routing the rear brake cable another way. I have tried moving it to the inside, between the inner exhaust bracket and the swingarm where a zip tie can keep it away from the swing arm. Does anyone have a more clever way to route this cable?