Exhaust Pressure Good For H?

Absent Minded Farmer · Sep 11, 2009

The muffler ordered from OEM has been painted up all purdy & installed on my H. It has a 1 3/4" pipe that was fitted to a standard Stanley body by OEM. First thing I noticed was how quiet it was. Next, I noted how nice & smooth it purrs. Seems to all-around operate a little better, too! Looks ok. Still think a painted muffler on a tractor is just plain silly. I'll get over it, I guess. Maybe I'll save up & have Mooneyes spin me some wheel disks & get a digital gauge set. Now there's s-t-y-l-e! Anyway, is the back pressure beneficial to my tractor? Thanks - Mike

CNKS · Sep 12, 2009

OEM is trying to duplicate the original muffler -- they have not done it. Only Marks Tractors and Carter and Gruenwald have done that -- at prices of $80-$100. Those mufflers are made to IH specs, construction and sound. The OEM small outlet was standard, does not affect back pressure, may have changed the sound. The original IH mufflers were straight through, a perforated tube on the inside, but no baffles. I don't know how OEM sets theirs up.

504-2 · Sep 12, 2009

Your engine is an air pump, air in air(exhaust) out,back pressure is not and has never been a good thing. That old wives tail started when some one would put 2 1/4 duel exhaust on their hot rod add a 4 barrel carb on a 2 barrel manifold. lots of air out but still wasn t enough coming in so they blamed it on a lack of back PSI but the problem was a lack of intake.

Absent Minded Farmer · Sep 12, 2009

I never understood how that worked but people swear by it. Thanks for putting that "old wife" to bed. - Mike

kopeck · Sep 13, 2009

There was a great thread about mufflers over at RPM:

http://www.redpowermagazine.com/forums/index.php?showtopic=44202&hl=muffler

Pretty much Stanleys were at the bottom of the pile, Nelson's and the one's made from IH blue prints were at the top.

I have a Nelson on my SM that I like, I have a Stanly of an A that I really don't care for.

K

Absent Minded Farmer · Sep 13, 2009

When I was working in the parts department of an International (Navistar) truck dealership, they stressed the use of & sold only Nelson muflers. The muffler from OEM is of straight through design. The scrawny pipe on top emits a sharp bark but, a quieter idle than the CaseIH fitsall Farmalls muffler. I removed the Stanley muffler from the 400 & replaced it with the one from the H. Quite an improvement! That Stanley muffler is all pipe & no can. It'll go on the W6 when I'm done with with the rebuild. I'm only using the W6 on the seperator & maybe a plow. I guess I'm happy with the OEM muffler, for now. I'l definately do my research & invest in a Nelson or one of those IH blueprint models. Thanks All - Mike

scot in pa · Sep 15, 2009

When I was little my SM always sat in the back of the toolshed with the head off being rebuilt (again!). It liked to burn valves. Grandpa had a different shop do the work the last time, and they told him to knock the baffle out of the muffler. The engine hasn't been opened past the spark plugs and oil changes in over 20 years now.

Exhaust Pressure Good For H?

Absent Minded Farmer

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CNKS

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504-2

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Absent Minded Farmer

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kopeck

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Absent Minded Farmer

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scot in pa

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