The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: scuba on August 29, 2008, 04:52:05 AM

Title: exhaust muffler end bore diameter
Post by: scuba on August 29, 2008, 04:52:05 AM

I'm wondering what is correct diameter of the very last opening on original muffler end cap. Mine is hand made long time ago upon the old original muffler and diameter is 20mm (just above 3/4'). Does anyone knows exact number since I'm preparing to make new mufflers out of prochrome steel.

thanks in advance for any answer

p.s. I can and I have time, meanings and material for it :) so, why not?

Title: Re: exhaust muffler end bore diameter
Post by: MrRiden on August 29, 2008, 11:01:35 PM

Scuba, I have the slightly louder LS silencers. I can shoot you the Dia. if you'd like to compare. I'll be in the shop tommrow.
rich

Title: Re: exhaust muffler end bore diameter
Post by: scuba on August 30, 2008, 06:21:46 PM

Thanks, that'll be just fine. I'm just curious  :)

Title: Re: exhaust muffler end bore diameter
Post by: montmil on August 30, 2008, 07:03:10 PM

The LS cans on my R65 have end openings that measured 1.067 inch.

The design of the muffler's end plate has a slight concave surface along with a rolled lip to the exhaust opening. The beam on my vernier caliper prevented measuring the narrowest opening that is a bit deeper into the can. I'm betting 1.00 inch is good.

Monte

Title: Re: exhaust muffler end bore diameter
Post by: scuba on September 01, 2008, 02:48:31 PM

Thanks, that'll be just like I thought. About 2.5mm which is about 1'