"Venting" L88 hood???
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
I would love to speak with one of those guys who knows the dynamics to that hood. I would love to work with him to design a way to get the hot air out and more cold air in. I have an L88 with no air box, so the pressure difference at the windshield is no big deal to me.
Melting Slicks
Joined: Feb 2001
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From: TEXAS - you mean there are other states?
I got my L-88 hood for $330 from the GM dealer ... in 1976 
I see the vent only working during low speeds or while in traffic. Since hot air rises, this sounds like a good idea. It seems like it would have little affect on the temp of 'cold' air at rear of hood. Even if it did - what differential? Certainly venting 300? degree heat would be better than keeping it. Also, how much of that vented hot air would actually enter the back of the hood - its not like it channeled or piped directly into the back of the hood. The cold air intake is sealed and intentionally so to prevent this extremely hot air from entering the carb. If you are travelling at x speed, I would assume the vented hot air would be even less of a problem.
Aerodynmaics would be cool to see - hey - maybe it would roll off to the sides due to the hood design??
Some negatives might be Rain/Road water and debris can drip/drain onto engine. Or when washing, water could pour onto hot engine.
I see the vent only working during low speeds or while in traffic. Since hot air rises, this sounds like a good idea. It seems like it would have little affect on the temp of 'cold' air at rear of hood. Even if it did - what differential? Certainly venting 300? degree heat would be better than keeping it. Also, how much of that vented hot air would actually enter the back of the hood - its not like it channeled or piped directly into the back of the hood. The cold air intake is sealed and intentionally so to prevent this extremely hot air from entering the carb. If you are travelling at x speed, I would assume the vented hot air would be even less of a problem.
Aerodynmaics would be cool to see - hey - maybe it would roll off to the sides due to the hood design??
Some negatives might be Rain/Road water and debris can drip/drain onto engine. Or when washing, water could pour onto hot engine.
Last edited by kaiserbud; Jan 21, 2007 at 08:28 PM. Reason: changed the word crap to debris
Melting Slicks
Joined: Feb 2001
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From: TEXAS - you mean there are other states?
I am really starting to see how sealing your car is so advantageous to cool your car.
Last edited by kaiserbud; Jan 21, 2007 at 08:29 PM.
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
........................................ . Whereas without the sealed cold air chamber, air is flowing right on through and OUT the back of the hood - most likely not in. Also - the air filter is open all the way around on the carb when using an L-88 FResh Air Package Hood - not just towards the back/distributor.......
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From: Paducah KY
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All of this was hashed out several times over the past few years. Below is a link to a good discussion. Happy reading.
Thread on Aerodynamics
Thread on Aerodynamics
Team Owner
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From: Columbia Missouri
You lost me on the last sentence there. I'm not sure what you're getting at. Regardless of whether you have an airbox or not, the pressure at the windshield base works the same to induce cold air into the scoop (and the air filter if it's open at all towards the distributor).
But I don't have any scoop. The engine is sealed from the outside when considering the hood. No opening at the front or back, sealed all the way around. The pressure at the base of the windshield makes no difference because it's not gonna have anything to do with what air goes into the motor. I was thinking if I cut a vent into the dip in the hood, it might suck hot air out. Others say that affects what air is sucked into the bay for the engine at the cowl, but I don't have a cowl opening.
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
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Team Owner
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From: Columbia Missouri
Team Owner
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From: Columbia Missouri
I laid it on the car to test fit it when I got it, and was wondering if I were going to use the stock style hood sealing kit because the back wasn't open like I was expecting.
Was it laid incorrectly?
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From: Paducah KY
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Dave
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No, you have to cut out the back for air to get in at the cowl. They do not cut them when they are made in case you want to have the forward air entry like the later cars come with, where it draws air over the radiator to ducting to the carb.
Team Owner
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From: Columbia Missouri
Good I was beginning to think I was a little crazy.
Melting Slicks
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From: TEXAS - you mean there are other states?
- but I wouldn't say it is cold air inductionDurango Boy - I have seen the L-88's with the closed rear area.
Last edited by kaiserbud; Jan 22, 2007 at 09:52 PM. Reason: spelling
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From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun.
I hear what you are saying .... but is that cold air induction - or just turbulance that brings air into the rear of the engine compartment and down the front of the firewall? Sure - its better than closed hood temperatures - but I wouldn't say it is cold air induction
Durango Boy - I have seen the L-88's with the closed rear area.
- but I wouldn't say it is cold air inductionDurango Boy - I have seen the L-88's with the closed rear area.
Melting Slicks
Joined: Feb 2001
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From: TEXAS - you mean there are other states?
the LT-1 hood had no vents - just chrome inserts for looks in those two areas. As for a door for the L-88 hood - there is none I am aware of - they are always open at the rear htat tunnel into the sealed area around the carb
Burning Brakes
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From: Paducah Ky
When I get my car back together I am going to test the cold air induction theory by temporarily installing a thermistor temp sensor inside the air breather. I will seal the rear of the hood and check temp then run again with it open and compare the results. It will probably be a month from now but I will post the results