griffith air intake
Discussion
I am starting a new project on my griff which will involve blocking off most of the area that is seen when the bonnet is closed, ie, the gap between the front egde of the bonnet and the underside of the front of the car body, the area where you can see the top of the radiator and fans.
so, will this have any detremental effects on anything?
the fans blowing the hot air from the radiator are below the line of the bonnet and therefor blow air into the engine area, but could it have any effect on air flow when travelling at speed, such as a build up of air under the bonnet causing the front end to become light?
thoughts appreciated.
so, will this have any detremental effects on anything?
the fans blowing the hot air from the radiator are below the line of the bonnet and therefor blow air into the engine area, but could it have any effect on air flow when travelling at speed, such as a build up of air under the bonnet causing the front end to become light?
thoughts appreciated.
Yep. The underside is where the most of the air that flows through the rad is sourced. The gap at the front is also very useful at sucking air from the rad and under bonnet and thus help prevent pressure building under the car and causing lift. If anything I would make the gaps bigger!
shpub said:
Yep. The underside is where the most of the air that flows through the rad is sourced. The gap at the front is also very useful at sucking air from the rad and under bonnet and thus help prevent pressure building under the car and causing lift. If anything I would make the gaps bigger!
hi steve, not sure if we are on the same wavelenght, the gap I am on about could only be made bigger by shortening the length of the bonnet, as the area I am looking at is the gap seen from above the car with the bonnet in the closed position, where you can just see the top of the rad when looking forwards from the rear of the bonnet.these things are so damned hard to explain!
When you look at it most of the radiator is below the front edge of the bonnet. You would think that fast moving air coming through the rad either form forward motion or the fans would be directed over the top of the engine. I've noticed that at rest with the fans running most of the air seems to come out through the wheel arches.
eff eff said:
When you look at it most of the radiator is below the front edge of the bonnet. You would think that fast moving air coming through the rad either form forward motion or the fans would be directed over the top of the engine. I've noticed that at rest with the fans running most of the air seems to come out through the wheel arches.
The area above that slot is just about the lowest pressure area on the whole car. It's ideal to use this to pull air out from behind the radiator, increasing flow through the radiator and reducing front end lift. More or less a case of the bigger the better, but even a small slot is very much worth having. The last thing you want to do is try to seal this off.cheers for the info guys, Ive spent a while over christmas looking at ways of changing the induction system, one of these being to feed the plenum directly from the front of the car in a straight line into a forward facing plenum.
as I found out yesterday though, to allow clearance for the bonnet front lip when opening and closing the bonnet would push any air ducting down so far that it would cover nearly half of the radiator fans, so no go there, and also even with a modified set of manifolds and y piece, the air flow would be heated up to much by the exhaust temperatures.
funny the things we get up to with time on our hands
still not completely ruled it out though.
as I found out yesterday though, to allow clearance for the bonnet front lip when opening and closing the bonnet would push any air ducting down so far that it would cover nearly half of the radiator fans, so no go there, and also even with a modified set of manifolds and y piece, the air flow would be heated up to much by the exhaust temperatures.
funny the things we get up to with time on our hands
still not completely ruled it out though.
GreenV8S said:
eff eff said:
When you look at it most of the radiator is below the front edge of the bonnet. You would think that fast moving air coming through the rad either form forward motion or the fans would be directed over the top of the engine. I've noticed that at rest with the fans running most of the air seems to come out through the wheel arches.
The area above that slot is just about the lowest pressure area on the whole car. It's ideal to use this to pull air out from behind the radiator, increasing flow through the radiator and reducing front end lift. More or less a case of the bigger the better, but even a small slot is very much worth having. The last thing you want to do is try to seal this off.eff eff said:
I can see that working if the air in the engine bay was static but its not, doesn't that mean that the air stream has to reverse to get out? A lot of cars intake air in that area and Jags, Astons and many others vent futher back on the bonnet. I wonder if that vent is more about not having to match a difficult shut line like the front of the doors than the most efficient vent.
There is a huge pressure differential across there and the air will have no problems nipping round corners etc. I can't say why TVR left/put that gap there, but I can say that it is in the ideal place to extract hot air from the engine bay and will improve cooling flow through the rad and reduce front end lift. Rather than sealing it, your efforts would be better spent increasing the size of the vent.eff eff said:
So then I guess you could close it as long as you provide some venting like the slots on the Tamora bonnet.
You could close off that gap and then add extra vents to replace it, but I can't imagine why you would want to. The only reason I can see is cosmetic, in which case vents are probably going to ruin any perceived improvements from closing the slot off. As you can probably tell, the whole idea strikes me as a big backwards step. But it takes all sorts. No doubt there are people who think I've ruined my V8S by cutting it about, and to be honest that doesn't bother me at all; at the end of the day the owner's opinion is the only one that matters.
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