Synlubes Posted September 2, 2002 Share Posted September 2, 2002 I have been reading the strings in this section about aero stuff etc. and have had this idea for some time and would like input! 1st, it`s an early model Z! 2nd, my idea was kinda set off after seeing these panels in the MSA catalog (pg.17 left bottom, Bomex frt. panels)(the one that expells air) 3nd, If I added some venting to the hood area just in frt of the radiator support member to exhaust air out the top side instead of having all that air go out under car, it seems this would work, or would it? I don`t know how the air flows over the hood at this area, wheather it would let air exit or try to suck air in at these vents? Vents would NOT be NACA type, just some slits(or something) cut in across the hood area. I have the 280 hood w/the vents and have made my own inspection lid vents, again tring to get as much air out of engine compartment and over top of car as possible, and will be adding some more venting to the hood (close to the back of hood, in between the stock vents) shortly! The car is used for HPDS and track events so all these ideas are ment to work at speed, cooling engine compartment and tring to keep some of the air from going under car! I have an extension to the air dam to block air that`s used for track events to lessin the air going under car (at frt.) I`m not an engineer, just have some ideas! Quote Link to comment Share on other sites More sharing options...
280Zone Posted September 2, 2002 Share Posted September 2, 2002 I have been thinking along those same lines, I have a 75 so I don't have the stock hood vents. I am fabricating some forward vents on my hood about where you are talking about. I haven't had the car on the road with them in yet but just thought I'd share. Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 2, 2002 Author Share Posted September 2, 2002 hey 280Zone, You could easily install the "stock vents" in your hood! I`m ready to start this project, just need to know how the air acts at this area on the hood! Quote Link to comment Share on other sites More sharing options...
ZROSSA Posted September 3, 2002 Share Posted September 3, 2002 There was a wicked thread about this about a year ago. Try to find it. It has input from people who do this kind of thing for a living. Sorry cant remember any name. In the end you want the air exit in a low pressure area. Tape lots of peices of string all over your hood and drive at say 60 mph. Where the string is lifting up is a low pressure area. You could just save the trouble and make a hood like Terry O's. Cheers Douglas Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Author Share Posted September 3, 2002 Thanks ZROSSA, The car is a track car not a street car, this is the kind of testing I need to do BUT can`t aford more tickets!!! I went thru all threads in this section just last nite, I shuold of bookmark it! (always think of these things after the fact)! HOW can I find threads from last year? Yea, Terry`s car is sweet! Mine is not quite that modified! Quote Link to comment Share on other sites More sharing options...
280Zone Posted September 3, 2002 Share Posted September 3, 2002 Sure, I could add the stock vents but what fun would that be? : ) Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Author Share Posted September 3, 2002 Your right!!! Get creative I`m going to use the cowl panel(between hood and windshied)(the large center section) in bewteen the 2 stock vents in my hood for aditional venting! I used the 2 smaller sections of that same panel for my inspection lid vents! I ran the slits long way, they look quite nice even though the hood vents slits are different! Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Author Share Posted September 3, 2002 OK, I went back in time and found some of the threads you may have been talking about! " Last week I mentioned that an old Z racer I know had seen aero data for the 240Z that showed a low pressure area above the hood in the first several feet from the leading edge. I'm looking for any detailed info on that phenomenon for the 240Z that anyone might have - especially what the pressure profile along the hood is, and how it might vary across the width of the hood." Can anybody varify this, I don`t want to add more air into this area? Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Author Share Posted September 3, 2002 Should there be any lips/deflecters at the leading edge of the openings of vent wholes/slots to make air flow over(to keep air from being sucked in)? Quote Link to comment Share on other sites More sharing options...
ZROSSA Posted September 3, 2002 Share Posted September 3, 2002 Doug, That wasnt the one I was thinking about but a good one never the less. I cant find it. You have got the idea anyway. It sound like the first couple of feet on the z are in low presure due to the lip forcing the air else where. This would imply that adding a little dam in this area really wouldnt help. What you need to do is seal the back of the radiator to the vent you make in this dead zone on the hood. The air the has to go there then. Air flow will speed up and your car will run cooler. Then you can think about limiting the amount of air you let in there in the first place. Douglas Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 3, 2002 Author Share Posted September 3, 2002 Hey ZROSSA, These vents will be in frt of the radiator, not behind! I`m not able to direct air from behind ratiator other than with the vents I have in the hood. And yes the grill opening will be reduced also! Thats part of the big picture! Quote Link to comment Share on other sites More sharing options...
BQR280Z Posted September 12, 2002 Share Posted September 12, 2002 I am building a 76 280 with a Holley 4bbl. I needed hood clearance for the carb, since I added a 1" insulator block and a 1/2" NOS plate. Since the under hood supports on a Z are all peripheral, I cut the hood 4" from each side and 4" across the back. Then welded 1/8" rod around the openings and raised the hood 2" at the rear edge, and forward 16" from the back edge. Basically creating a cowl hood. I welded in diamond grating, to keep the punks from messing with my motor. It looks nasty, not on the road yet, but soon. Maybe some blue neon lights in the engine bay, just to keep my motor company. Bill Quote Link to comment Share on other sites More sharing options...
BayAreaZT Posted September 13, 2002 Share Posted September 13, 2002 The Porsche 911GT2 has vents just in front of the hood. I don't know if the pressure profile is similar to the Z though. If you can get nice laminar flow over the front of the hood and turbulent higher pressure air below the vent then the air will extract. Maybe a vortex generator below the vents will work. Quote Link to comment Share on other sites More sharing options...
Guest Anonymous Posted September 13, 2002 Share Posted September 13, 2002 Here's some info to help you guys work out your designs... http://www.zccw.org/Tech/Body/09-97EarlyZAerodynamics.html Quote Link to comment Share on other sites More sharing options...
Synlubes Posted September 13, 2002 Author Share Posted September 13, 2002 Thanks for the link Jumbo240z I have searched alot, but have not come acrossed that one! There has been some amount of conflicting info in some articles, I just need to do some testing on the frt 1.5 feet of hood to see what happens up there! Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.