Drivetrain Why no BOV
#1
Why no BOV
So why is there no BOV on the SC motor??? Having always owned a turbo car and missing my old hks ssqv from my twincharged unit, I set out to see why roots style SC's have no bov... I've been told because there is no backpressure from a SC so there is no reason for one... they are used with prochargers.... belt driven... I just like the sound, reguardless of the need! haha... But once the air is in the "charge pipe", ie... SC horns and IC... that area is under load correct? One the SC stop's spinning, the air stops... but it does not stop instantaniously so there is still pressure in the lines yes? Who will justify with me that we need a M45 BOV
#2
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So why is there no BOV on the SC motor??? Having always owned a turbo car and missing my old hks ssqv from my twincharged unit, I set out to see why roots style SC's have no bov... I've been told because there is no backpressure from a SC so there is no reason for one... they are used with prochargers.... belt driven... I just like the sound, reguardless of the need! haha... But once the air is in the "charge pipe", ie... SC horns and IC... that area is under load correct? One the SC stop's spinning, the air stops... but it does not stop instantaniously so there is still pressure in the lines yes? Who will justify with me that we need a M45 BOV
Last edited by Guest; 05-24-2008 at 10:24 PM.
#3
The simple explanation is that the blower comes after the throttle body, and that the blower is linked directly to the engine, because of those you dont get the sudden pressure spikes associated with rapid on off throttle application like you do in turbo cars, hence no need for a BOV.
There was a thread about this about a week ago, try and dig that up.
There was a thread about this about a week ago, try and dig that up.
#4
My understanding was that unlike a turbo, where it actually stops making boost and has to respool on shifts, a positive displacement blower still makes boost, thus it's better to recirculate it than blow it to atmosphere. I'm not very well versed on blow off valves, never been into them.
This is mainly a boring Sat night and me looking for a reason to put a BOV on my M45 or if it would even work...
#5
The simple explanation is that the blower comes after the throttle body, and that the blower is linked directly to the engine, because of those you dont get the sudden pressure spikes associated with rapid on off throttle application like you do in turbo cars, hence no need for a BOV.
There was a thread about this about a week ago, try and dig that up.
There was a thread about this about a week ago, try and dig that up.
#7
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I don't know much about how they work or why to fit one. There are tons of people that have asked over the years though and there's lots of good info.
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#9
#10
With the advances of the market now tho, i dont know what i should do, go back to TC, or a differnet route... full boost at 2200rpms was very nice tho!! 24lbs is crazy in a mini...
#12
#13
Here you go:
https://www.northamericanmotoring.co...Blow+off+valve
Typing in "Blow off valve" into search also yielded about 2 pages of results.
I will send you pic or to of the Angel eyes in a PM.
https://www.northamericanmotoring.co...Blow+off+valve
Typing in "Blow off valve" into search also yielded about 2 pages of results.
I will send you pic or to of the Angel eyes in a PM.
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