Bus Conversions dot Com Bulletin Board
September 02, 2014, 10:16:42 AM *
Welcome, Guest. Please login or register.

Login with username, password and session length
News: If you had an E-Mag Subscription: It will not get torn up or crushed if you back over it with your bus.
   Home   Help Forum Rules Search Calendar Login Register BCM Home Page Contact BCM  
Pages: [1]   Go Down
  Print  
Author Topic: Grand Rock mufflers?  (Read 397 times)
bevans6
Hero Member
*****
Offline Offline

Posts: 4600


1980 MCI MC-5C




Ignore
« on: April 01, 2014, 07:38:12 AM »

My local truck parts place doesn't carry Donaldson, they carry Grand Rock, which I have never heard of.  They seem legit;  http://www.grpipes.com/

Has anyone had any experience with them?  I am looking at their M-121 muffler, 5" in/out same end 10" by 15" oval muffler for my MCI with turbo 8V-71

Thanks, Brian
Logged

1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
luvrbus
Hero Member
*****
Online Online

Posts: 12326




Ignore
« Reply #1 on: April 01, 2014, 09:12:31 AM »

Brian, they have been around for 40 years you don't last that long building inferior products I have used their products before no complaint
Logged

Life is short drink the good wine first
bevans6
Hero Member
*****
Offline Offline

Posts: 4600


1980 MCI MC-5C




Ignore
« Reply #2 on: April 01, 2014, 11:14:42 AM »

Thanks for the vote of confidence.  Made in Painesville OH, too.  $165 for a M-121 muffler, would probably fit most MCI's from the same kind of time period as mine.  Smaller than the OEM muffler by a lot, same height at around 10" but 15" wide instead of over 20" for the MCI, around the same length at 26" vs about 28" for the MCI.  Input on the MCI is 5" but the output was weird at 4.25" from memory.  I had to make a custom piece for the output when I built my exhaust three years ago.  I am going to put a 5" chrome tip on this one, just like the kids with the rattle cars have   Grin

Brian
Logged

1980 MCI MC-5C, 8V-71T from a M-110 self propelled howitzer
Spicer 8844 4 speed Zen meditation device
Vintage race cars -
1978 Lola T440 Formula Ford
1972 NTM MK-4 B/SR
TomC
Hero Member
*****
Offline Offline

Posts: 6750





Ignore
« Reply #3 on: April 01, 2014, 12:29:40 PM »

M-121 is the same number, and same muffler I'm using in my bus, but from Donaldson. I guarantee they are selling the Donaldson muffler. Good muffler, turbo rated, and puts out a nice tone. Good Luck, TomC
Logged

Tom & Donna Christman. '77 AMGeneral 10240B; 8V-71TATAIC V730.
luvrbus
Hero Member
*****
Online Online

Posts: 12326




Ignore
« Reply #4 on: April 01, 2014, 12:43:20 PM »

I never bought a muffler there but do buy a lot of the bellows pipe and they are made to your spec at Grand Rock they do sell the hump hoses for the air system if you need one their stuff is not junk
Logged

Life is short drink the good wine first
Pages: [1]   Go Up
  Print  
 
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.18 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!