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someonestolecc
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someonestolecc Grand Master

someonestolecc

Posted
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For some of the people in this post who didn't get what I was saying-

- it's not a fault. all buses do it of certain make(s) do it.

- i didn't say it was necessarily a bov used for turbos. it is air escaping so it's "blowing off" in some form or another. personally i think it's the door/brake pneumatics.

- it hurt my ear and I want to sue the government (not serious) so what would i do? why isn't this noise pollution? (does anyone know if it's just accepted or 'enshrined' in law somewhere?)

Thanks :(

... ps.

Can anyone tell me where to get one of these bus BOV's? and is there an adaptor to fit them to my laser turbo?

SIK WLEH BROTEC comes to the rescue.. PM me for a good price.

FATGTS-R Experienced

FATGTS-R

Posted
Posted

You sure thats an exhaust brake?

Not saying your wrong but I drive trucks and have not seen one set up like that before. I have only ever seen the butterfly flap in the exhaust pipe and the Jake brakes which hold the valves shut for the engine braking. How does that one work.

In relation to to BOV noise, as mentioned its the pneumatic release from the air brakes and in a bus situation from the airbag suspension as well. Sometimes when there stopped on a slope you see a bus rocking forward and backwards as the airbags try to level themselves.

I look at the engine setups on our trucks all the time and I have no friggin idea whats going on. One engine has an internal wastegate along with an external gate as well that seems to vent back to the inlet manifold?

And on the inlet piping they have multiple pressure actuators that I have not a clue what they do, when they open/close and what for.

Freddy Kruger Mentor

Freddy Kruger

Posted
Posted

couldnt they suppress it something? it shouldnt need to be that loud...

it real bad in a loading bay, the truck reverses in and the brakes squeels a little before it stops, then PPPPSSSSSSHHHHH!!!!! and you nugget your pants :/

GTRgeoff Grand Master

GTRgeoff

Posted
Posted

Yep, that's an exhaust brake. A Jake brake uses oil pressure to the hydraulic lash adjusters which cracks the exhaust valve on the compression stroke preventing the compression ignition combustion (no spark plugs) from completing so it "brakes" the engine.

Don't be afraid big rig and bus noobs, the noises won't hurt you. :P

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

Its can also be height adjustment

Thats air driven aswell (esentially air bags i think).

SOme super new buses can change ride height depending on passenger load.

They too can be noisy. Not as loud as the compressor veniting though

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