Vintage Dirt Bike Q & A

Anything and everything about Vintage Dirt Bikes! After you Register, email nathan@alp-sys.com and let me know so I can activate you.
It is currently Thu Mar 28, 2024 9:05 am

All times are UTC - 7 hours [ DST ]




Post new topic Reply to topic  [ 2 posts ] 
Author Message
PostPosted: Wed Jul 15, 2015 9:00 am 
Offline

Joined: Mon Jun 01, 2015 12:59 pm
Posts: 34
Anyone using the fiberglass header wrap on a CR or MR pipe? Any adverse reasons not to? I put this on a chamber on my "slightly" modified Yamaha Zuma scooter, it quiet the exhaust noise. Maybe it's my imagination but it also seemed to help the mid-range performance. I don't run this engine for extended periods of time like I will the MR. Would this trap to much heat in pipe making it brittle?
IJ


Top
 Profile  
 
PostPosted: Wed Jul 15, 2015 6:00 pm 
Offline

Joined: Sun Nov 30, 2008 12:10 pm
Posts: 1010
Location: Connecticut, USA
Heat shouldn't be an issue with the MR pipe (the highest temp I've read on mine was 320 degrees, right at the manifold). Wrapping the pipe could move the powerband up the rpm range a little bit, as sound travels faster with temperature and the pipe will act like it's slightly shorter.

I think the pipe brittleness comes mainly from many heat cycles / pressure pulses / vibration. The MT125 pipe I modded was very brittle; a chunk blew out of it after it went back together, I had to add some reinforcement (it's been fine ever since).

I used some thin adhesive lead sheet on the center section of my custom pipe once. It greatly reduced that tinny 'ring-ding' pipe sound, but was heavy and looked like crap so I scrapped the idea - maybe I'll try it again sometime.

Ray

_________________
'74 CR125M (175cc), '75 MR175, '82 RM250Z, '08 YZ250F, '14 Zero FX electric, '14 Zero MX electric, '18 Alta MXR electric


Top
 Profile  
 
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 2 posts ] 

All times are UTC - 7 hours [ DST ]


Who is online

Users browsing this forum: No registered users and 46 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
cron
Powered by phpBB® Forum Software © phpBB Group