Have any of you thought of ways to vent some of the heat outa there? Like louvered hoods, washers under the hood mounts, etc? Any attempts?

 

Yes i have,,i have a clean stock hood on right now,on
the other hood i cut and glass'ed on a NACA duct right
over the aircleaner,i have also made a NACA duct on
the left(passanger side)head light lid,,both function.
i also have done the junkyard thing for bolt on vents,
so far i've found that the 280z's have vents on the hoods that un bolt, even the turbo models. on a 1st gen.
the hood swings the other way, so washers i don't think
would help,an n/a engine doesn't even generate the underhood heat that a turbo engine generates,,but the
rotory engines produce some underhood heat, or is that
in the design of the car,,i wonder..

 

I've been driving around with a little Radio Shack indoor/outdoor thermometer. It's got a big LCD display, and a sensor at the end of 8 ft. of wire. I just have it laying on my seat, and have been measuring the temp at different spots in the engine, including inside the carb airhorn.
It's suprisingly low.

I will try to chart some #s at some point just for future reference, but unless you're super modded, I don't think you need to worry about a vent so much - -That is, concerning under-the-hood temps. However, if you're looking for increased airflow thru the radiator, that is a different story.

(I run a yaw carb w/ headers, and estimate between 150 and 160 HP. I shift frequently at 7K RPMs, and drive like a lunatic. I still have the stock crappy water cooled oil cooler, and I never go past the halfway mark on my gauge.)

 

http://www2.apex.net/users/patryn/79rx7.htm

mine is down towards the bottom. basically a simple heat release vent located right in front of the alternator to let the hot air through the radiator out. did it in about 10-15 min with an air powered cutting wheel. as you can tell, spare hood.

 

That looks pretty good, and being up front I guess you don't have to worry about getting any electrics wet.

 

i have driven in rain and washed the car. had no problems of water in the dizzy on my points or my electric. the vent is pretty low profile too so you don't stand out as a muscle car, etc. if you decide to do one i'll send you the measurements that i used for mine.

 

if you want to put a hole in your hood, make sure you do it in a LOW pressure area, not a high pressure area. Look at the flow chart for the FC to get an idea. Around where the hood and windshield come together is a HIGH pressure area. Don't put a heat exhaust port there. Put it somewhere else.

 

like where mine is?

 

Jeremy, I don't understand. Did you just bend the metal after cutting a slot or did you use a scoop or what? It looks really good, very subtle.

 

I agree with Sterling, underhood temperture is not that high. Even driving for hours in 100+ heat has never seen my gauge go past half way. If the temperature started to climb it would reflect a problem with the engine rather than the lack of air flow. Adding a scoop just makes the car look faster, in most cases it has the same impact as adding a turbo badge.

 

i just hand bent it down and tried to keep a smooth arc across. of course you have to hack the bracing out from under it.

 

I thought you were a freaking nut

 

wha who who, wha who who huhhuhhuhuhuuhuhhuh

 

I just dont understand the need for it, #1 you werent having overheating problems, #2 you ruint a hood you could have sold?

Dunno, we been kinda through this before

 

well no, it's not overheating, but, there is a LOT of heat under the hood if you've ever noticed ... couldn't hurt.

 

Obviouslu there is a lot of heat while the car is sitting still. Why not put your head under the hood when its doing 60mph. That would be a real cool.

 

depends on who's driving, lol. i look at it like this, my stock temp guage is sticky and not accurate and i autox. i did it to also give the higher pressure under the hood a release. the hood was free to me and an extra. also pulling heat from the bay will allow components to last longer and improve performance a bit as the carb will stay cooler thus the air coming in stays cooler. all in all its not a bad thing all though its not a necessity. you guys sure are **** about this. i like the looks of it too.