The New And Improved Unofficial R65 Forum V2

Technical Discussion => BMW Technical Q&A, Primarily R65 => Topic started by: marcmax on October 27, 2009, 06:27:18 PM

Title: No Crossover Tubes
Post by: marcmax on October 27, 2009, 06:27:18 PM

I have a set of headpipes that have had the crossover tube connectors removed and welded over. I was thinking of installing them and wondered if anyone has any comments, yes or no, about doing this. Any benefits, drawbacks, performance issues, etc.?

Title: Re: No Crossover Tubes
Post by: Bob_Roller on October 27, 2009, 06:33:25 PM

From what I can remember, the crossover tubes helped the mid-range power band .

Don't know in reality, if you would notice a difference or not in the performance level of an R65 or not if the tubes weren't there .

Title: Re: No Crossover Tubes
Post by: Rob Valdez 79 R65 on October 28, 2009, 04:42:19 PM

I'm pretty sure the bike will run stronger with the crossover.

They even added a second crossover in '81 for additional boost.

Title: Re: No Crossover Tubes
Post by: bruce_launceston on October 29, 2009, 05:41:48 AM

I've been running my LS 2 into 2 without any balance pipes for about 20 years.
I've never felt the need to weld them back in, it runs fine as it is with it's custom made mufflers.

Title: Re: No Crossover Tubes
Post by: Justin B. on November 01, 2009, 09:13:23 AM

bruce, the difference in your muffler backpressure might be helping you.  Every case I've read about when someone removed the crossover from an otherwise stock exhaust system performance suffered.