When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
The '74 I just got is missing the cowl induction parts on the hood. I do have the air cleaner assy. with seal etc.
Im looking at volunteer products catalog and it consists of 3 parts, the flapper valve and retainers and the solenoid. Solenoid means to me that is electrical, but I was under the impression it was a vacuum system?
Yes! It is and electric solenoid.
A switch on the accelerator pedal sends 12 volts to it when you floor it.
Thanks, I didn't see any kind of wiring on the hood that's why I asked.
I just received the factory assembly manual, I'll check in there for the harness routing.
There should be a wire that runs from the front of the hood to the back
that plugs in the wiring by the headlights.
Here are photo of my 73 hood with the wiring running to the
cover were the electric solenoid is located.
According to my '73 service manual, the hood vent is opened via solenoid when the switch is triggered by the gas pedal. This is just to reinforce what others have said.
(Also, when I get home I'm going to have to check to see that I still have a wire going to said solenoid... I don't recall seeing it. Thanks for the pic, donnie.)
Also, not intending to hijack the conversation, but why does the cold air induction need to be closed at all? wouldn't that just help the engine efficiency? Pm's welcome, if this is considered a hijacking.
There should be a wire that runs from the front of the hood to the back
that plugs in the wiring by the headlights.
Here are photo of my 73 hood with the wiring running to the
cover were the electric solenoid is located.
Donnie
Excellent, I'll hunt for the missing wires etc. when I get home. Thank you
Mine is just totally missing, but it would need to be installed to take effect of the cold air. Without the carrier it can't seal the system to the outside duct. Just more things to buy
Excellent, I'll hunt for the missing wires etc. when I get home. Thank you
I just remove mine, leaving it always open. I have all the under hood parts you are more than welcome to what I have, just pay the postage. Just let me know . Brent
I just remove mine, leaving it always open. I have all the under hood parts you are more than welcome to what I have, just pay the postage. Just let me know . Brent
When I modified my L-88 style hood for ram air recently I used my water manometer to check vacuums or pressures at various locations. I was shocked to find there was actually a vacuum at the base of my windshield. Pressure didn't start happening until my probe was 1/2 way up my windshield so I assume the L-88 style hood with it's dome causes that. If the hood was flatter there might be pressure at the base of the windshield. So I modified it to get the air intake at the front of the hood right in front of the radiator.
When I modified my L-88 style hood for ram air recently I used my water manometer to check vacuums or pressures at various locations. I was shocked to find there was actually a vacuum at the base of my windshield. Pressure didn't start happening until my probe was 1/2 way up my windshield so I assume the L-88 style hood with it's dome causes that. If the hood was flatter there might be pressure at the base of the windshield. So I modified it to get the air intake at the front of the hood right in front of the radiator.
i'd like to see pictures of this modified l88 hood.
It doesn't NEED to ever be closed or even installed but it's nice to have all the gadgets working.
Yeah, I can understand that. The thought occurred to me that using a completely sealed air filter shroud would force all of the inducted air to come through the hood. I don't know if there would be a great enough cross-section to insure good flow, but it would seem to a novice like me that cold air intake would be preferable for engine efficiency.
I guess the question is *why* do they have a solenoid closing off the vent?
Also, I looked at my hood, and the cable was running along side the insulation, so as far as I know, my solenoid is operable.
Thanks as always for the information
Last edited by heirloomvette73; 11-13-2015 at 12:54 PM.
Yeah, I can understand that. The thought occurred to me that using a completely sealed air filter shroud would force all of the inducted air to come through the hood. I don't know if there would be a great enough cross-section to insure good flow, but it would seem to a novice like me that cold air intake would be preferable for engine efficiency.
I guess the question is *why* do they have a solenoid closing off the vent?
Also, I looked at my hood, and the cable was running along side the insulation, so as far as I know, my solenoid is operable.
Thanks as always for the information
Most likely to force intake air through "snorkles" on air cleaner and heat stove pipe during cold start and warm up. Emissions compliance was accomplished in a lot of strange ways before computers and electronic fuel injection. Chip.
Most likely to force intake air through "snorkles" on air cleaner and heat stove pipe during cold start and warm up. Emissions compliance was accomplished in a lot of strange ways before computers and electronic fuel injection. Chip.
I was wondering about "cold start" and warm up. I think you might be on to something there. Seems that I recall reading somewhere about a thermostat controlling the radiator fan, such that the fan would be off until a certain temperature was reached.
Emissions? The only thing a Corvette emits is sheer joy, as far as I'm concerned.
Well, I guess in light of that info I'll keep the solenoid and let it do it's thing.
11-11-2015, 10:45 AM
Cowl Induction
