Blowoff valves - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 15 (permalink) Old 02-01-2008, 09:00 PM Thread Starter
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Blowoff valves

I know on cars ( mustang's, camaro's) that have turbos on them run BOV's Y don't we? I know all about compressor surge and that it's good to have a bov on a car. But what about on a diesel truck. Hell cars most of the time only make 12-16 psi (talking street NOT the Strip) where we make 35-45 psi. So y don't we run them?:shrug:

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post #2 of 15 (permalink) Old 02-01-2008, 11:47 PM
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There is a few people producing them for diesel too...
http://www.bd-power.com/ram/product....boGuard&tt=ram

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post #3 of 15 (permalink) Old 02-02-2008, 09:51 PM
 
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I'm not really sure why they aren't more common :shrug: They are good to have but BD is about the only one who makes one and they are a little spendy
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post #4 of 15 (permalink) Old 02-03-2008, 03:43 AM
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Quote:
Originally Posted by Dual K20s
I'm not really sure why they aren't more common :shrug: They are good to have but BD is about the only one who makes one and they are a little spendy

They are not on diesel engines because diesel is not a throttle operated engine, another words no throttle body. a diesel engine meters fuel, while a gas engine meters air. Gas engines need the blow off valve to get rid of the exrta pressure between the turbo and the valvebody when it closes. Thats why there is no need for one on a diesel.
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post #5 of 15 (permalink) Old 02-03-2008, 01:49 PM
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Quote:
Originally Posted by Cumminsdude2001
They are not on diesel engines because diesel is not a throttle operated engine, another words no throttle body. a diesel engine meters fuel, while a gas engine meters air. Gas engines need the blow off valve to get rid of the exrta pressure between the turbo and the valvebody when it closes. Thats why there is no need for one on a diesel.
I don't think this is true...

Still in all either way gas or diesel you can get turbo barking. I'm capable of doing it with my stock turbo now with just a Edge Comp. Turbo barking is the rushing of air back out the intake of the turbo when the throttle is dropped quickly. This backwards rush is enough to break turbo shafts at enough boost pressure. At any rate turbo barking is not good for a turbo...

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post #6 of 15 (permalink) Old 02-04-2008, 02:05 AM
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Does anyone else make them for diesel trucks or will any bov work?

I have been looking for one because some say that the HX40 I just installed have problems snapping shafts and I don't want to buy another turbo.

I just don't want to spend $700 on one when all these ricer guys get them for around $200. However most that I have found are only adjustable up to 20 psi or so.

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post #7 of 15 (permalink) Old 02-04-2008, 04:01 AM
 
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Quote:
Originally Posted by Mopar1973Man
I don't think this is true...

Still in all either way gas or diesel you can get turbo barking. I'm capable of doing it with my stock turbo now with just a Edge Comp. Turbo barking is the rushing of air back out the intake of the turbo when the throttle is dropped quickly. This backwards rush is enough to break turbo shafts at enough boost pressure. At any rate turbo barking is not good for a turbo...

some one needs to tell this to Ford cause my f-550 does this all the time. :ford
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post #8 of 15 (permalink) Old 02-04-2008, 04:33 AM
 
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Quote:
Originally Posted by Cumminsdude2001
They are not on diesel engines because diesel is not a throttle operated engine, another words no throttle body. a diesel engine meters fuel, while a gas engine meters air. Gas engines need the blow off valve to get rid of the exrta pressure between the turbo and the valvebody when it closes. Thats why there is no need for one on a diesel.

Makes sense to me I believe we have a winner :
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post #9 of 15 (permalink) Old 02-04-2008, 04:36 AM
 
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Quote:
Originally Posted by iwannagofast
Does anyone else make them for diesel trucks or will any bov work?

I have been looking for one because some say that the HX40 I just installed have problems snapping shafts and I don't want to buy another turbo.

I just don't want to spend $700 on one when all these ricer guys get them for around $200. However most that I have found are only adjustable up to 20 psi or so.

I think it would be relatively simple to adapt one to any turboed engine with a little work
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post #10 of 15 (permalink) Old 02-04-2008, 05:00 AM
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Quote:
Originally Posted by Mopar1973Man
I don't think this is true...

Still in all either way gas or diesel you can get turbo barking. I'm capable of doing it with my stock turbo now with just a Edge Comp. Turbo barking is the rushing of air back out the intake of the turbo when the throttle is dropped quickly. This backwards rush is enough to break turbo shafts at enough boost pressure. At any rate turbo barking is not good for a turbo...

I am sure of that, i was just stating that because gas engines have throttle bodies there is all that pressure from the turbo pushing against it and something has to be there to relieve the pressure. The only time i have ever heard of a blowoff valve on a diesel was on a truck that was in proffesional drag racing or tractor pulling from what i have seen from videos and read articals. Never seen one in person on a diesel. I know when my cousin had his Eclips 4cyl 5spd. he had an aftermaerket blowoff valve that replaced the factory one, and i know he liked taking it up newengland dragway. Other than that i don't know what types of requirements they are needed on.
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