Things I'm doing to improve boost (pics)

[B_K]

1500 cfm -  that is awesome amount of air moving through the motor. Hate to think how much pollution those things belch out. 

Talk to Don Fairchild about that! He can make run as clean or cleaner than a stock 60 series or Cum a part!
  BK 

[Geoff]

The only pollution I worry about is smoke, and stinky exhaust.

--Geoff

[Scott & Heather]

Good idea and yes i will do that. Along with a turbo blanket for the hot side and exhaust wrap. I just test drove it and it runs really good. I'm happy with the mods so far. Haven't measured the boost yet. But I'm still running hot. She keeps flirting with 200°F not even towing my truck. I don't know what gives. I'm going to have ken turn down my fueling a bit and I'll have to pull a radiator and look inside to see if it's getting buildup.


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[sledhead]

having the power is nice but not if it blows up . I would turn down the power until you figure  out the the black smoke and the heat build up

how does it sound on the road at speed with the new exhaust ?

dave

[luvrbus]

Have you pulled the cover on the water pump and checked the impeller on the pump they do wear,you need to find out what temperature your transmission is running at too it can increase the heat in the engine

[bevans6]

An 8V-92 pumps 851 cubic feet of volume at 2000 rpm (fun with math!).  Take some away for overlap on the valves and the intake slots, add some back for the blower and the turbo, 1500 cfm (measured at some rated pressure drop, of course), is still probably around double what it actually pumps.  The difference is so it has the headroom to perform well, and still perform well after a year or two of running.

[luvrbus]

It could be his fuel also the 8v92 doesn't like the bio blend fuel they seem to run hot and loose power with any blend over 5% Loves stations are the worst

[Scott & Heather]

Dave, it sounds amazing. I've run straight exhaust before and this actually sounds way way nicer. Like a mellow slightly aggressive but very large sounding exhaust note. Hard to describe but I'm very pleased. No noticeable increase of noise inside and just has a great sound. I'm thrilled with it.

Cliff, I haven't done this because it appeared the water pump had been replaced when I bought the coach two years ago. The plastic cover was a good indicator. (Didn't have the metal bolted plate). But I'll do this anyway just to be sure. Your thoughts about the tranny intrigue me. I have a feeling my Allison is dumping too much heat into the coolant. Can I actually install a separate cooler for just the trans fluid and eliminate the coolant/trans fluid heat exchanger altogether?


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[Geoff]

Dave, it sounds amazing. I've run straight exhaust before and this actually sounds way way nicer. Like a mellow slightly aggressive but very large sounding exhaust note. Hard to describe but I'm very pleased. No noticeable increase of noise inside and just has a great sound. I'm thrilled with it.

Cliff, I haven't done this because it appeared the water pump had been replaced when I bought the coach two years ago. The plastic cover was a good indicator. (Didn't have the metal bolted plate). But I'll do this anyway just to be sure. Your thoughts about the tranny intrigue me. I have a feeling my Allison is dumping too much heat into the coolant. Can I actually install a separate cooler for just the trans fluid and eliminate the coolant/trans fluid heat exchanger altogether?


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Some bus nuts have installed a large transmission fluid radiator with a fan and brought temperatures​ down.

--Geoff

[Iceni John]

Some bus nuts have installed a large transmission fluid radiator with a fan and brought temperatures​ down.

--Geoff

I was one of them, along with Tom C who gave me the idea first!   I (we?) use the Thermal Dynamics DB-00341DC cooler, installed after the torque converter but before the engine's heat exchanger.   This cooler has 1" inlet and outlet, and I reused my old Kysor Alarmstat 195-degree temperature switch to turn on the fan when the fluid reaches that temperature.   I also have an override switch to run the fan all the time, and I reused one of my old Cole-Hersee solenoids to provide power to the motor.   After having essentially replaced my entire cooling system, I don't know how much difference this cooler makes to the engine temperature, but other folk say it drops their coolant temp by a few degrees.   When I drive out to the high desert tomorrow for our annual Crownaholics get-together I'll try turning the fan on and off from the front as I'm driving, to see what difference the fan itself makes to the transmission and coolant temps.   I mounted the cooler under the bus, behind the driver-side rear wheels at an angle so it catches the air flowing under the bus, but protected from stones thrown up from the tires  -  it's not the ideal o0cation, but it seems to work well enough there.

Tom and I bought ours from that outfit in Florida that trades under several different names, but the same cooler is also on eBay for almost $200 less than I paid!

John

[luvrbus]

I have a air to oil cooler for a Allison but is a monster in size that we removed from a Eagle it is 25in X 36in with 1 inch tubing if you can find a mounting place I'll make you a deal on it

[Scott & Heather]

Cliff, I'll be doing some measuring on Sunday and connect with you about that....what causes an Allison to run warm or hot? Shifts fine, trans fluid is fine. Is there a fluid or additive that can help it run cooler? Thanks for the ideas Geoff and John too. I think I'll be adding this. With some new exhaust parts, some new hoses, new intake and filter and a little bit of paint, the engine compartment is starting to feel more livable. I might add a bedroom in there. At least my guests will stay warm:



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[lostagain]

Scott, your transmission likely runs at normal temperatures: 180 cruising on the flat, and well above 200 under heavy load (210, 220). You don't have a transmission oil temp gauge? The problem is that the bus cooling system has to deal with that, and shedding the engine heat as well. So an auxiliary transmission cooler can help. I say "can", because my PO had one just inside the pax side engine side door. One day it started leaking so I removed it. Didn't make any difference, so I never fixed it or reinstalled it. I guess it wasn't getting enough air to be effective. If you install one, make sure it is big enough, and gets lots of air from a good location, and efficient fans.

JC

[luvrbus]

Scott,fluid level is culprit most of the time it will run warmer low or high on fluid level.I find most running hot are overfilled because owners don't know how to check the fluid level   

[Scott & Heather]

Ok do tell what is the proper procedure? Check while idling right? Like a car?


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