Exhaust soot

[Charles Moore]

I'd like to put some bikes on a bike rack on the back of my bus . But the exhaust fumes get all over everything back there and I don't want the bikes to get covered in that exhaust soot .

Any way to clean up the exhaust? I've tried some fuel system cleaners and I think that has helped but has not eliminated the problem .

What about re-routing the exhaust so it comes out the side behind the rear wheel?
Think that would help?

Thank you!

 

[Booyah45828]

A turbo would help solve that problem for you

Rerouting the exhaust out the side and into the airstream passing by the bus would help too. There's a big dead zone of air that follows behind a large object, like a bus, when it goes through the air. Which is why the soot seems to hover back there and get all over the back end.

 

[rhkcommander]

More air or less fuel will do it. Booyah is spot on too

 

[IDIBRONCO]

A Hypermax smoke puff eliminator would probably help too.

 

[Dane Rickford]

I believe Mel @Agnem ( Conestoga Diesel Injection ) sells the smoke puff eliminators as well

 

[hesutton]

Even better, a turbo with a smoke puff limiter.

Heath

 

[Charles Moore]

Yeah a turbo would be nice!
I might have to hunt for a crashed truck or van with a turbo IDI and swap that over.

Id never heard of the smoke puff limiter before. Thanks for the recommendation!
I'll have to look into that

 

[IDIBRONCO]

I don't know much about a SPL. From what I understand, it's mostly for lower RPM operation. It may not do much if you are at highway speeds and use more throttle to get up a steep grade. I may be wrong on that one though.

 

[Shadetreemechanic]

New air filter is a first step if its been a while.

 

[Booyah45828]

I've never seen a smoke puff limiter for an NA diesel. All the ones I've seen are boost referenced and are therefore for turbo engines to cut back on fueling until sufficient boost is made.

Truthfully, if you're producing that much soot NA, You should just turn the pump down a flat at a time until it clears up.

 

[IDIBRONCO]

I've never seen a smoke puff limiter for an NA diesel. All the ones I've seen are boost referenced and are therefore for turbo engines to cut back on fueling until sufficient boost is made.

Well I learned something today.

 

[Charles Moore]

I've never seen a smoke puff limiter for an NA diesel. All the ones I've seen are boost referenced and are therefore for turbo engines to cut back on fueling until sufficient boost is made.

Truthfully, if you're producing that much soot NA, You should just turn the pump down a flat at a time until it clears up.

Thanks! I got the exhaust done for $40.

But how would I turn the pump down?

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[Dane Rickford]

Here is a link to a write up on how to mess with the fueling:https://www.oilburners.net/threads/turning-up-a-db2-injection-pump.59187/
Just instead of turning the fuel screw clockwise, turn it counterclockwise to turn the fuel down

 

[Charles Moore]

Here is a link to a write up on how to mess with the fueling:https://www.oilburners.net/threads/turning-up-a-db2-injection-pump.59187/
Just instead of turning the fuel screw clockwise, turn it counterclockwise to turn the fuel down

Cool thanks. That doesn't look too bad.

Any reason not to turn it down a notch or two? Seems like it would lean it out too much and heat things up .

 

[chillman88]

Cool thanks. That doesn't look too bad.

Any reason not to turn it down a notch or two? Seems like it would lean it out too much and heat things up .

Diesel engines don't work like that. Turning it down just limits the available fuel. These are always unrestricted air and RPM is controlled by the amount of fuel injected, unlike a gas engine where the air is metered relative to the fuel.