Draw-through pressure relief valve question
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- Posts: 22
- Joined: Sat Sep 15, 2007 6:32 am
Draw-through pressure relief valve question
Hello
So. I have a draw through turbo system, which is controlled with a waste gate.
Now, I was thinking about boost, and safety... And show ponying. I thought fitting a pressure relief valve set to whatever the maximum boost my engine can cope with minus a little, for two reasons:
1) In the event my wastegate fails, I don't go overboost.
2) For drag strip, it would be a quick way of changing my boost without messing around with the wastegate. Simply disconnect the actuator hose, block it, and let the relief valve vent when I hit max boost.
So, obviously, being draw through, this means I will be venting air and fuel once at max boost. I figured, dump that into the exhaust and let it blow out the back. Add to that a spark plug, and we have a bit of a party going on at the back.
A few things... My setup is a junkyard "for a giggle" type thing. A 4-1 header into a Garret T3 bolted to an uprated 1600, locked timing, and an upright smoke stack (it's in a Volksrod).
Were I to do this, I can't envisage that I would trigger a manifold detonation, but what are your thoughts? I'm thinking of the spark plug as a bit of showponying for the drag strip (who doesn't like fire coming from an exhaust?), yes I know I should go FI, I should go blowthrough, I should should should do this that and the other... But I'm not.
A recipe for a biiiig ka-boom, do we think?
So. I have a draw through turbo system, which is controlled with a waste gate.
Now, I was thinking about boost, and safety... And show ponying. I thought fitting a pressure relief valve set to whatever the maximum boost my engine can cope with minus a little, for two reasons:
1) In the event my wastegate fails, I don't go overboost.
2) For drag strip, it would be a quick way of changing my boost without messing around with the wastegate. Simply disconnect the actuator hose, block it, and let the relief valve vent when I hit max boost.
So, obviously, being draw through, this means I will be venting air and fuel once at max boost. I figured, dump that into the exhaust and let it blow out the back. Add to that a spark plug, and we have a bit of a party going on at the back.
A few things... My setup is a junkyard "for a giggle" type thing. A 4-1 header into a Garret T3 bolted to an uprated 1600, locked timing, and an upright smoke stack (it's in a Volksrod).
Were I to do this, I can't envisage that I would trigger a manifold detonation, but what are your thoughts? I'm thinking of the spark plug as a bit of showponying for the drag strip (who doesn't like fire coming from an exhaust?), yes I know I should go FI, I should go blowthrough, I should should should do this that and the other... But I'm not.
A recipe for a biiiig ka-boom, do we think?
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- Posts: 3146
- Joined: Mon Jul 24, 2006 3:11 pm
Re: Draw-through pressure relief valve question
Boom
your new name will be: Blow a-part Dave
your new name will be: Blow a-part Dave
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- Posts: 22
- Joined: Sat Sep 15, 2007 6:32 am
Re: Draw-through pressure relief valve question
Would it though? I have in mind something akin to the old lighter and deoderant / flammable gas thing. If venting into the exhaust... would the gas flow prevent it igniting backwards into the manifold? I actually expect I would get a series of pops, bangs and the odd livk of flame from the exhaust rather than a flame thrower... i am guessing no one has been dumb enpugh to try yet?
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Re: Draw-through pressure relief valve question
I can't begin to tell what a bad idea this is...
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- Joined: Sat Sep 15, 2007 6:32 am
Re: Draw-through pressure relief valve question
I wish someone would! lol!
Though I get it, huge risk, and it's actually not like a deodorant can since the contents of the can do not mix with oxygen until it leaves the nozzle. Air/fuel mix is already at the correct mixture and pressurised, so I thinking about it, it would probably set the whole lot alight even with a check valve. But still... It was a thought and something no one seems to really "know" what would happen...
Though I get it, huge risk, and it's actually not like a deodorant can since the contents of the can do not mix with oxygen until it leaves the nozzle. Air/fuel mix is already at the correct mixture and pressurised, so I thinking about it, it would probably set the whole lot alight even with a check valve. But still... It was a thought and something no one seems to really "know" what would happen...
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- Joined: Mon Jul 17, 2006 12:01 pm
Re: Draw-through pressure relief valve question
Fire comes to mind plus maybe inbreeding causing serious brain damage . LOL
- Piledriver
- Moderator
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Re: Draw-through pressure relief valve question
You go first.
Take good videos, from a safe distance of course.
Take good videos, from a safe distance of course.
Addendum to Newtons first law:
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
zero vehicles on jackstands, square gets a fresh 090 and 1911, cabby gets a blower.
EZ3.6 Vanagon after that.(mounted, needs everything finished) then Creamsicle.
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- Joined: Sat Sep 15, 2007 6:32 am
Re: Draw-through pressure relief valve question
Hahaha - were it not for the fact that I have absolutely no way of testing it without being in the car, I would be tempted to see what happens.
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Re: Draw-through pressure relief valve question
I definitely would not recommend what you are trying to do but it would be cool at night !!! If I was going to even try this I would probably use a stainless Fogger NOS nozzle upwind and a spark plug downwind of the exhaust flow. I would use a stainless hard line to connect to a remote fuel solenoid to isolate heat and maybe not burn your car to the ground. If you do it post a night time video of it. I love crazy people, LOL
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Re: Draw-through pressure relief valve question
Hahaha I sure will. I don't want to just inject fuel into the exhaust though, it was more of a way of dealing with the blow off from the air/fuel mix if I were to use a dump valve or similar to quickly swap between street and strip pressures.
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- Posts: 22
- Joined: Sat Sep 15, 2007 6:32 am
Re: Draw-through pressure relief valve question
... Maybe I should bolt the steup to a stock 1600 and see what it does... That way if I kaboom it, I don't explode my good engine.
- woodsbuggy1
- Posts: 820
- Joined: Sun Feb 20, 2011 5:15 pm
Re: Draw-through pressure relief valve question
I think that the only safe way to do this would be to route it back to the turbo exhaust outlet.
Best of Luck
Kenric
Best of Luck
Kenric
Good quality is getting harder and harder to find.
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- Joined: Mon Jul 24, 2006 3:11 pm
Re: Draw-through pressure relief valve question
I have a so-so wastegate I can sell you it goes bang bang
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- Joined: Fri Feb 08, 2013 11:48 am
Re: Draw-through pressure relief valve question
What about a MBC = Manuel boost controller, they are cheap
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