Open Air Cleaner
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Open Air Cleaner
I have a base 1971 350ci with dual snorkel air cleaner assembly, what is the advantage of an open air cleaner assembly and which one would be best for my car.
Also can you tell me the correct size exhaust pipes.
Also can you tell me the correct size exhaust pipes.
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Approximately 1% power loss for every 10-degree (F) increase in inlet air temp. So, going from a system shown in Yadkin's photo above (providing, for example, 80-degree outside air into the carb) to an open element system providing 180-degree underhood air, you may see a 10% LOSS in power.
Had a 1976 L-82, 4-sp
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From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
180*F if you run electric fans pointing down. Mine are nowhere near that, Anyway, do the math. If it takes 50 hp to go down the road at 60 mph, I guess I lose 5 hp. Big deal.
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Last edited by HeadsU.P.; May 21, 2021 at 04:24 PM.
Le Mans Master
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From: Indiana
cold air kits air kits on a car that already has OEM cold air is a waste and often worse.. agreed..
i have learned that emissions or not (also driveability) my 79 was designed to intake 130f air winter or summer to maintain best ratio in normal driving. The secondary inlet is ambient air at full throttle.
pretty cool actually.. no way would i put an aftermarket cold air kit on an originally without it.. but would replace it with oem even a snorkel but that's me..
for sure the engine compartment is 170-200f.. compared to ambient and power is measurable...and cheap..
@Bikespace also added open element comparison
and @REELAV8R has a link too
Cold air cleaner Thermocouple experiments 79 L82 4m ac - CorvetteForum - Chevrolet Corvette Forum Discussion
i have learned that emissions or not (also driveability) my 79 was designed to intake 130f air winter or summer to maintain best ratio in normal driving. The secondary inlet is ambient air at full throttle.
pretty cool actually.. no way would i put an aftermarket cold air kit on an originally without it.. but would replace it with oem even a snorkel but that's me..
for sure the engine compartment is 170-200f.. compared to ambient and power is measurable...and cheap..
@Bikespace also added open element comparison
and @REELAV8R has a link too
Cold air cleaner Thermocouple experiments 79 L82 4m ac - CorvetteForum - Chevrolet Corvette Forum Discussion
Last edited by interpon; May 21, 2021 at 05:03 PM.
Melting Slicks
Joined: Nov 2010
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From: Michigan
Cold air on a stock heated manifold intake is not exactly ideal, more like cooler air for heat soaked engine compartments. Most older stock CAI were poorly design and as I said just for cooler than heat soaked air at stock power levels. Modern ones are supposedly much better and not much for the aftermarket to improve on but CAI are diy friendly, so $$$ to be made. In my opinion the factory CAI C3 setup is actually not bad, other than the small air filter. Even so dry EFI intakes are more effected by underhood temps(10deg 1%) because they don't have liquid(fuel) cooling.
You can cool things down as much as you can and make some more power BUT that's at WOT and driveability can suffer. Also you have to tune for cool and if the temp changes then your out of tune, helps if your self tuning EFI.
Lots of things in the aftermarket are not ideal but dictated by what sells vs what is actually best, bigger is better or at least that is what sells!
You can cool things down as much as you can and make some more power BUT that's at WOT and driveability can suffer. Also you have to tune for cool and if the temp changes then your out of tune, helps if your self tuning EFI.
Lots of things in the aftermarket are not ideal but dictated by what sells vs what is actually best, bigger is better or at least that is what sells!
Last edited by BOOT77; May 21, 2021 at 05:46 PM.
Had a 1976 L-82, 4-sp
Joined: Mar 2011
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From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
cold air kits air kits on a car that already has OEM cold air is a waste and often worse.. agreed..
i have learned that emissions or not (also driveability) my 79 was designed to intake 130f air winter or summer to maintain best ratio in normal driving. The secondary inlet is ambient air at full throttle.
pretty cool actually.. no way would i put an aftermarket cold air kit on an originally without it.. but would replace it with oem even a snorkel but that's me..
for sure the engine compartment is 170-200f.. compared to ambient and power is measurable...and cheap..
@Bikespace also added open element comparison
and @REELAV8R has a link too
Cold air cleaner Thermocouple experiments 79 L82 4m ac - CorvetteForum - Chevrolet Corvette Forum Discussion
i have learned that emissions or not (also driveability) my 79 was designed to intake 130f air winter or summer to maintain best ratio in normal driving. The secondary inlet is ambient air at full throttle.
pretty cool actually.. no way would i put an aftermarket cold air kit on an originally without it.. but would replace it with oem even a snorkel but that's me..
for sure the engine compartment is 170-200f.. compared to ambient and power is measurable...and cheap..
@Bikespace also added open element comparison
and @REELAV8R has a link too
Cold air cleaner Thermocouple experiments 79 L82 4m ac - CorvetteForum - Chevrolet Corvette Forum Discussion
Le Mans Master
Joined: Jun 2019
Posts: 7,650
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From: Indiana
Had a 1976 L-82, 4-sp
Joined: Mar 2011
Posts: 5,338
Likes: 1,213
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
No but another forum member did without rad seals and his temps were not that much above ambient. But some guys just like to believe what they want to believe for whatever reasons. Electric fans pointed downwards will increase underhood temps but thats a trade off for thinking electric fans are superior to an old school clutch fan.
Safety Car
Joined: Mar 2017
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From: Orlando Florida
Regardless of cold vs hot air and actual power, an open element will significantly increase motor sound at high throttle openings -- the entire reason it was popular in the 70's to flip the lid on Chevelles and Novas.
Had a 1976 L-82, 4-sp
Joined: Mar 2011
Posts: 5,338
Likes: 1,213
From: Some days your the dog and some days your the hydrant.
Royal Canadian Navy
And my 14"X4" high open air cleaner will suck in more air than any factory cai. Remember, more air plus more fuel equals more power. I'll take "hot" air over a restricted air flow cai anyday.