I think I solved my overheating issues for $65

[neoneddy]

TLDR - Turns out, getting as much of the hot air out of the engine and engine bay is important to keep the engine cool.

Let's start with a little history.   When I bought my bus it had a muffler in the academic sense, the bottom was rusted out horribly.  So I replaced it, but never got an exhaust tip for it, I figured it wasn't a big deal because the original didn't have one.  What I didn't realize was my new muffler had the muffler ports at the same level, the OEM one had the exhaust opening lower.   Long story short, my original rusted muffler output exhaust lower than my new one, my new one pushed more exhaust into the engine bay by being high up. 

I should've known as my engine continued to get more and more soot on it, and  on my radiators , somehow the swirling air / exhaust was getting into my radiators.

So this spring I cleaned the radiators out, and managed to get this exhaust tip on there https://amzn.to/2LHCMje I had to rotate the muffler some, but it's working like a champ now.

I took it out for a good run, it was up to 70 or so here in Minnie, my engine temp never got much above 140 with the shutters open (I turned off the air to the shutter stat like usual in the summer).  I eventually turned the shutters back on and we got it up to operating temp.   The engine bay was so much cooler than when I ran in March without the exhaust tip.  So much of the exhaust was getting caught in the under belly of the engine bay, and getting pushed anywhere around there, anywhere but out like it should have been.

Thanks for reading this far,  I'll do my best to update this when we're pulling the van up a hill in 90+ temps later this year.

[MagnoliaBus]

Did you install it straight down or at an angle so that it dont blow too much dust ?

[neoneddy]

I angled it out like a gentleman, mostly so I could better see if I'm making black smoke or not, or any other color while driving.  I didn't think about the dust.

[edvanland]

on my 8V92 in a MCI 7 fought heat for years and even after I put a large truck radiator on the back still had to watch my heat. In Dec last year took the muffler off and put a 5" resonator with one 90 degree turn then out the side behind the tag axle. What a difference, less smoke when you start up, less soot on the back of the bus and towed, and less heat.
ED

[neoneddy]

Yeah some guys here said "Ah just run a straight pipe" when I was doing mine.  I thought "Na, I want to be courteous to my neighbors  at home, at the campground, on the road, etc" ... ignorance was bliss, there is no hiding a 2 stroke behind a muffler.   I just might run it straight if that doesn't  completely fix it.

[edvanland]

With the resonator it makes about the same amount of noise.

[chessie4905]

It probably would from 40 feet away.🙉

[Jim Eh.]

Yeah some guys here said "Ah just run a straight pipe" when I was doing mine.  I thought "Na, I want to be courteous to my neighbors  at home, at the campground, on the road, etc" ... ignorance was bliss, there is no hiding a 2 stroke behind a muffler.   I just might run it straight if that doesn't  completely fix it.

That just may free up your exhaust flow but restrict the places you can travel.