8v92T

[Ace]

Tom mine was $700 from Prevost and that was a few years ago!


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[wg4t50]

Seems the perfect time for a resonator, many have made the switch and would never go back to the OEM muffler.  The increase in useable hp is surprising to most, of course most can detect a small increase in hp while a few could not detect a 200 hp inprovement, so for those, go ahead and purchase the OEM setup and enjoy.
Dave M

[digesterman]

Seems the perfect time for a resonator, many have made the switch and would never go back to the OEM muffler.  The increase in useable hp is surprising to most, of course most can detect a small increase in hp while a few could not detect a 200 hp inprovement, so for those, go ahead and purchase the OEM setup and enjoy.
Dave M

Dave,  I am running the DD 60 series, was there a noticeable noise increase in changing to a resonator? My OEM muffler is very quiet which is nice and which came from Prevost. But if there is a HP advantage with a resonator I would really take a look at changing.

[TomC]

Once again-go to the Donaldson web site and look through the truck mufflers. They also have many tables as to the proper muffler for your engine. The 8V-92TA is at the top end of the 5" system, so the proper muffler with enough exhaust flow is critical. When you find the correct muffler, go order it from a big truck dealer. It will always be cheaper then from a bus dealer. Good Luck, TomC

[luvrbus]

The DD Engineering Bulletin # 39 dated Sept 1987 revision 2 states a 6 inch for a 8v92TA, 5 inch is for a 6v92TA,8v71n/a and the 8v71T fwiw

[muldoonman]

Boys would it be better on engine with straight exhaust and let her rip on A 8V92TA?

PS,
I like to be noticed!   

[Van]

Boy howdy, wouldn't be cool to put 5" fish tails ( no muffler of course ) on and let er' Rip.

[luvrbus]

The 8v92TA is really not all that loud without a muffler you can hear the turbo more tho, but the N/A 71 are very loud

[Nineforever]

Does any one have a part number for after market muffler for 8v92T  its factory 5 inch    looks the same as a 8v71 n but its diffrent inside back pressure is diffrent

[luvrbus]

I think you will find if that is the original muffler it will be a Nelson not a Donaldson so check out the Nelson then cross it over as a Nelson is a high $$$ muffler you won't buy one for 200 bucks like a Donaldson take your measurements and go to www.unitedmuffler.com they will have one

[TomC]

When I bought my first truck with a 8V-92TA, it had a single 5" up exhaust. Course it only had 9A90 and rated at 435hp. Pushing a 500hp, I could see using 6" exhaust-but-6" really gets expensive. Good Luck, TomC

[belfert]

Nelson was the only one who still made my particular muffler.  It was either pay $350 for a Nelson or over $1000 to MCI for something they probably bought from Nelson.  Walker used to make the muffler also, but they discontinued it.  The same muffler is also used on several Navistar trucks so I'm surprised so few make it.  I used the Navistar part numbers too, but that didn't help.

[shelled]

Back in the 1960's with the turbocharged Corvairs, we found that the turbo reduced the need for a muffler by 90% so a resonator was all you really need behind a turbo.

e3

[luvrbus]

Some things DD done never made any sense to me like the 8v92TA has 2-1/2 exhaust manifolds they want a 6 in exhaust then the 8v71N/A has 3in exhaust manifolds they want a 5in exhaust the DD way but it works     

[bevans6]

On a turbo engine you have smaller primary tubes (the manifolds up to the turbo) to keep the velocity of the exhaust gas high.  After the turbo you want as low a restriction as possible hence the larger diameter.  On a natural engine you just want low restriction everywhere, so you go big from the head.  My 8V-71NA had 4" off the manifold but the turbo version was 3" up to the turbo.

Brian