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Mufflers, crossover and gas mileage [message #307526]

Wed, 21 September 2016 08:07

Tilerpep

Messages: 404
Registered: June 2013
Location: Raleigh, NC

Karma:

Senior Member

The last thing on Jim K's bad gas mileage fix list is blocked mufflers. I have indication of exhaust restriction on my intake manifold crossover passage, as the paint is definitely overheated.

Banging on the mufflers with a rubber hammer only sounds like rust scale, no loose plates or baffles. They look good from the outside.

So, looking to replace, reading on the forum, saw Walker 18425 muffler as an option. Crawled under coach and hit the pipes with a micrometer thing.
2.2 inch OD pipe going into each muffler (original config two mufflers, Y after). One muffler pipe is 2.2 coming out, other muffler is 2.0 coming out, and welded to the 2.2 from the other to make the joiner/Y. I wuould assume this is some local shop's solution to a cheap muffler system?

Question is: is that enough difference to unbalance the sides, and push exhaust through the crossover? This input matters because if I can figure out how to put two new 18425's on myself it will be under a hundred bucks. If I need a new Y to get the flow right, it will be at a shop anyway and I'll just let them do mufflers and Y

1975 Glenbrook, 1978 Royale rear bath Raleigh, NC

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[Message index]

		Mufflers, crossover and gas mileage By: Tilerpep on Wed, 21 September 2016 08:07
		Re: Mufflers, crossover and gas mileage By: lqqkatjon on Wed, 21 September 2016 08:28
		Re: Mufflers, crossover and gas mileage By: Loffen on Wed, 21 September 2016 09:05
		Re: [GMCnet] Mufflers, crossover and gas mileage By: James Hupy on Wed, 21 September 2016 09:30
		Re: Mufflers, crossover and gas mileage By: Tilerpep on Wed, 21 September 2016 11:29
		Re: Mufflers, crossover and gas mileage By: Loffen on Wed, 21 September 2016 11:48
		Re: [GMCnet] Mufflers, crossover and gas mileage By: jimk on Wed, 21 September 2016 13:52
		Re: Mufflers, crossover and gas mileage By: JohnL455 on Thu, 22 September 2016 10:23
		Re: Mufflers, crossover and gas mileage By: Tilerpep on Thu, 22 September 2016 10:56
		Re: Mufflers, crossover and gas mileage By: lqqkatjon on Thu, 22 September 2016 15:40
		Re: [GMCnet] Mufflers, crossover and gas mileage By: jimk on Thu, 22 September 2016 16:23
		Re: Mufflers, crossover and gas mileage By: JohnL455 on Thu, 22 September 2016 17:46
		Re: Mufflers, crossover and gas mileage By: Tilerpep on Fri, 07 April 2017 08:02
		Re: Mufflers, crossover and gas mileage By: JohnL455 on Fri, 07 April 2017 08:47

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