Dual hood vents
 

I was wondering if anyone could answer this stupid question.


I just got a 78 with dual hood vents and the left one has a cover panel bolted to the bottom of it, the right one is free flowing. i was wondering why this is being that the left side of the engine compartment with the intake/exhaust manifolds would stand to have a greater need for improved cooling then the right side where the vent sits over the spark plugs and fusible links, whcih doesnt make sense with water dripping down on them.
I was curious if maybe both sides came covered from the factory and the right one was removed for some reason, and also is it a good idea to remove the panel from the left side for improved air flow or is the cover panel there for a good reason?


BlaZed

Re: Dual hood vents
 

its so the air box doesnt get water in it and rust out

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver

Re: Dual hood vents
 

Air box? The 280Z has an aluminum intake manifold, and that doesn't usually rust. I think they came both un covered from the factory and someone put a cover on one side for some reason. Maybe for winter driving. I would take it off and leave both sides open. If you think any of the electronics on the right side are getting wet, you can put the cover on that side or try to fabricate a plastic cover for your electrical components.

http://www.zipcon.net/bleach/pages/zcar/zlogo.jpg

Re: Dual hood vents
 

it has the driver's side vent open to help cool the turbo...which gets a hell of a lot hotter than the exhaust does lol

Re: Dual hood vents
 

I have the exact same setup in my 78Z and it doesn't have a turbo or anything. I suspect this is the way it came from the factory. I have left mine on with no ill effects.

Anyone else have a reason for this configuration?

Re: Dual hood vents
 

That's what he was saying. The driver's side (left side) has a plate underneather the vent that prevents air from cooling that side. That is why I suggested he remove that plate.

Also, this is not a turbo ZX or a 240Z. It is a 280Z. Please read what the buy posted originally.

http://www.zipcon.net/bleach/pages/zcar/zlogo.jpg

Re: Dual hood vents
 

Wrong..... all vented cars come i with the cover on that side ...... and one reson is to stop water around the induction area .... im thinking 260Z though .... in '76 on we got 260Z 2+2's with vented bonnets, so thats what i was talking about when i said airbox....injectors then i suppose .. not much else under there ...

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver

Re: Dual hood vents
 

The dual vents were added to combat overheating probs/fuel perculation in the FI Z's (north america)

The drivers side is originally covered.. to protect electronics, and to have a matched look (cosmetics)

Remove it.. I did.. funny part is on hot days in stop and go traffic,. the heat distorts the drivers vision.hehe

No worrys about taking it off..

Re: Dual hood vents
 

I removed mine years ago it was just doing nothing and there have been no ill effects. Well the heat distortion ting but who cares really

Have you Zeen me Lately.

Re: Dual hood vents
 

I see a few people suggesting removing it with no ill effects. Is there any advantage to removing it?

Re: Dual hood vents
 

better cooling

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver

Re: Dual hood vents
 

Ok, so you got the vents in 1976, while in the US and Canada it was the 77+ Z's. I'm not sure on the early 280zx, but my 1982 280zx (turbo style hoods) has a very large air duct on the left side that is completly open. No shields. There is a shield inside the engine compartment that deflects air away from the brake cylinders and down toward the exhaust. That makes good sense though, to help draw the air down around the exahust and out under the car. The right side has the smaller vent as you know. It is open underneath (no plates) but doesn't look like it has much use. The only thing that gets a little wet is one side of the battery. The ZX engine compartment is wider, and therefore the electroncis along the side are pretty far away from any openings.

My triangular strut tower bar is right below the large vent. You can see it easily there when the hood is closed. It probably blocks some of the air flow, but I'm running an N/A motor.

https://www.zdriver.com/rides/spec/p..._994541134.jpg

http://www.zipcon.net/bleach/pages/zcar/zlogo.jpg

Re: Dual hood vents
 

in our cars battery and brake cylinders are swapped around .. along with stearing etc ... lot more room on out cars .. dont have the steering right near exhaust and everything ..

72 240Z restoring
72 240Z RB25DET Conversion
78 260Z 2+2 Daily Driver