Exhaust for 4106

[eddieboy]

I just bought a 1962 PD-4106 this year and I am in desperate need of some exhaust information.  My bus only had the manifolds and 1 piece of pipe coming off the front (fore) of the engine.  I need some pics or specs on what parts I need to buy in order to put a safe exhaust on this beast.  If anyone can help, I would greatly appreciate it.  eddieboy PD-4106-1475

[roadrunnertex]

You need to call Luke at U S Coach 1-888-262-2434.
I bet he will have what you need.
jlv

[baker4106]

Luke is where I got what I needed to build my own system.   You need the crossover pipe to start

[Busted Knuckle]

Need to get FL Cliff to chime in on this! He has built his from scratch and has a good source for parts! I can't remember which model bus Cliff has, but it is a GM and should be close! FWIW   BK 

[uncle ned]

Now is the time to think of a turbo. talk to don about a wastegate turbo.

ned

[TomC]

I would highly recommend you NOT install a stock system. The stock 4106 system on the 8V-71 used a single 3" outlet that stuffed up the engine-made for quiet, but would only accommodate the 256hp that originally the engine was rated for.  What I have on my turboed 8V-71 is a single 5" coming out of the turbo to a Donaldson 5" in and out-with both inlet and outlet on the same end-turbo muffler.  When you look inside, it just has a single baffle between the right and left side.  It flows very well and puts out a nice tone-not too loud.  If I remember right it is 26" long and 18" wide oval.  Good Luck, TomC

[JohnEd]

Uncle Ned,

I am not asking you to estimate for Don.  Do you have a ball park cost for the turbo and the plumbing?

Thanks,

John

[TomC]

I had Don turbo my engine.  Before taking it to Don's I had a custom air to air intercooler made for in front of the radiator (102" wide bus with about 10" of space between the side of the bus and the radiator).  First thing Don did was to pop out one of my pistons to see what rings it had-since it is a transit, it had the tighter transit style rings that will take mild turbo boost.  Then he installed an early Series 60 turbo with waste gate set at about 15psi.  Also changed the injectors from brown tag N65 to 9G75; installed fuel modulator (keeps the rack from opening until turbo boost is up-otherwise lots of black smoke at start up); installed the bypass valve on the blower; new oil pump drive.  It runs great, but had a heating problem. So after the conversion, I installed a bigger radiator with 15 misters; turbo muffler; bigger air cleaner; auxiliary transmission cooler with thermostatically operated fan.  I can pull hills gently in over 95 weather, if below 90, all is fine.  With all modifications both Don and I did, it cost $11,000 (had the V730 overhauled also for an additional $6,000).  Now virtually everything in the engine compartment is new, rebuilt or overhauled-which I like, and the bus performs extremely well.  If you just had a smoke turbo put on without the air to air intercooler keeping the same injectors, it would cost probably less than half.  Good Luck, TomC

[JohnEd]

Tom,

Thanks!  I guess that puts the turbo and plumbing at about $5K.

Thanks again,

John

[HB of CJ]

Yeah, same answers.  You have an opportunity, not a exhaust project.  How about designing your own "hi efficiency DUEL BIG PIPE exhaust system" incorporating both minimal mufflers, perhaps two (2) spark arrestors...and...space/future potential to mount some particulate filtures?  Them smog boys they is a commin". 

The reasons I'm suggesting have already been answered by others.  It's my understanding the stock exhaust on a 4106 (which I drove years ago) is very restrictive and sounds only so-so.  You now have a chance to build up YOUR OWN system which will help your Detroit a little and....sounds soossss boss/max/radical/cool! 

[TomC]

I wouldn't plan on a particulate trap retrofit on any 2 stroke engines.  They burn oil (just naturally) and are too dirty for the particulate trap to take care of.  You'd be either emptying it or running a regeneration cycle way to often on the engines (like everyday).  Good Luck, TomC

[GM0406]

Whenever you go to pipe city, you better be prepared for tight turns and no room!  Here is what they did with my coach to get the muffler out of the way.  Bill T. 1963 1406 1860

[GM0406]

Another pic showing more.

[GM0406]

The bumper is extended back.  Bill

[gm4106]

Mine is 5 inch in on top and 5 inch out on bottom. Donaldson muffler part Number m090595 $103.29 at Truck Pro
Very happy nice sound