Re: Grain truck muffler

Posted by Gambles on December 26, 2020 at 11:26:37 from (24.246.203.110):

In Reply to: Grain truck muffler posted by young tractor on December 26, 2020 at 09:12:00:

I think the answer that you want is...."It depends..."
Anybody here, as a kid, drive a big V8 grain truck, coast down a hill, shut the key off for a few seconds and then turn the key back on? Did your mufflers survive?
If you want the economy route and you want to save some money on the install, glass packs might be the way to go. Horsepower wise, you PROBABLY won't have the highest with a glass pack. Yes, they sound smooth and mellow to young ears, but compared to other mufflers, these are usually more restrictive.
A big stock-type OEM muffler will be the quietest, but is probably the most expensive. Most of the older, bigger Fords have a tendency to backfire when you use the gears to de-accelerate. Is your distributor in good working order? If you have no backfire and want it quiet, the factory type muffler is the way to go, provided you want quiet and don't mind the price.
If your truck backfires, at all, you might also want to consider a thick, welded muffler available from the speed shops and mail order catalogs. They are almost indestructible.
Here's what you DON'T want to do: In the early 80s, I was a kid right out of tech school and was working at a mom-and-pop type of gas/service station. It was in a farming community and the area farmers were TIGHT. In comes a guy with a Chevy grain truck that had a big block in it, IIRC, probably a tall-deck 427. It had an exhaust in it with a single muffler and he brought in a Walker Scottish muffler or perhaps it was called Royal Scott. It looked exactly like a glass pack except this had no fiberglass in it. If you looked inside this muffler, you could see the exhaust took the path of a regular dual-180° muffler. In other words the exhaust went forward and back inside the muffler a few times, except the pipes inside this muffler were very small. I showed this feature to the farmer and he said he didn't care. In other words, "Put it on!" A day later, he came back with the muffler in his hands and told me that I had somehow failed to get the clamp tight on this muffler. I knew better. This muffler was so restrictive, it blew off because of back pressure. Again, he told me to put it back on and this time he told me to get it right. So I installed his muffler, clamped it down tight (like I did the first time) and I then drilled three small holes through the muffler input tube where it slipped over the exhaust pipe and I put three sheet metal screws through the muffler's input tube. These sheet metal screws made sure that this muffler never blew off again.
I'm sure there was a loss of horsepower, but the farmers saved a couple of bucks on his exhaust and he never came back again for exhaust work.

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