If his car isn't overheating, its not practical.grimbo wrote:turn it around and make it functional then maybe yes. On my Sierra I cut 5 x 40mm holes on the back of the bonnet to help aid cooling when it had the 5K in and it made a marked difference. Mind you, you couldn't see them from the front of the car so didn't look dicky and an added benefit was it helped keep the windscreen defrosted in cold weather
and you still get all the benefits of airflow.
I'd say someone is having a lend of you there.NIK wrote:I put one on once to fit the engine and used a nissan patrol scoop. Now I have a different engine and Im stuck with a dicky scoop that I regret doing it dosnt seem to effect cooling either way round. I was thinking of getting rid of it and doing what Grimbo suggested but talking to a hot rodder he,s seen a guys engine blow and were does the oil go? Straight out the back covered the windscreen and the guy crashed and died. Just a story I was told but made me think. Maybe swift?? style small rectangular ones either side just behind the radiator infront of the engine would help cooling.
Just my thoughts.
Nik
I beg to differ, I think cowl induction scoops take benifit of low pressure zones created by there design and by having the air filter in this low pressure zone the engine sucks are more effectively. I doub't there would be a build up of pressure from a cowl scoop even on a almost verticle style windscreen like the sierras. I think the desired affect with cowl scoops and no drop in plate for a air filter is to have air flow through the radiator grill and out the top for freely instead of hitting the firewall and being forced to go down under the car. Just my opinion.want33s wrote:A bonnet scoop is usually fitted to allow more air into the engine.
Wether the scoop faces forwards or backwards makes little difference to airflow.
If you face it forwards you have more wind resistance and a sharp edge to potentially get defected for.
If you face it rearwards you won't have a wind resistance issue
No matter how big a rear facing scoop is it WILL NOT extract heat OUT of the engine bay, as you are driving, air hitting the windscreen builds a high pressure zone. this high pressure zone pushes the air into the back of the scoop. This is called COWL INDUCTION. Just like all those big american muscle cars of the 70's.
I suggest you try searching "Cowl induction" [Google perhaps] so you have some idea of what you are talking about before you embarrass yourself further.GRPABT1 wrote:
I beg to differ, I think cowl induction scoops take benifit[sic] of low pressure zones {???}created by there[sic] design and by having the air filter in this low pressure zone the engine sucks are[sic] more effectively. I doub't[sic] there would be a build up of pressure from a cowl scoop even on a[sic] almost verticle[sic] style windscreen like the sierras. I think the desired affect with cowl scoops and no drop in plate for a[sic] air filter is to have air flow through the radiator grill[sic] and out the top for freely instead of hitting the firewall and being forced to go down under the car. Just my opinion.
On the other hand I would love a high mount intercooler with a drop in plate and a combo scoop that forces air down into a drop in plate and out the top of the bonnet through cowl scoop.
ahem...want33s wrote:I suggest you try searching "Cowl induction" [Google perhaps] so you have some idea of what you are talking about before you embarrass yourself further.GRPABT1 wrote:
I beg to differ, I think cowl induction scoops take benifit[sic] of low pressure zones {???}created by there[sic] design and by having the air filter in this low pressure zone the engine sucks are[sic] more effectively. I doub't[sic] there would be a build up of pressure from a cowl scoop even on a[sic] almost verticle[sic] style windscreen like the sierras. I think the desired affect with cowl scoops and no drop in plate for a[sic] air filter is to have air flow through the radiator grill[sic] and out the top for freely instead of hitting the firewall and being forced to go down under the car. Just my opinion.
On the other hand I would love a high mount intercooler with a drop in plate and a combo scoop that forces air down into a drop in plate and out the top of the bonnet through cowl scoop.
I'm not embarassed mate, I said it was my opinion not solid gold facts. I will do that google search though and also ask some drag racers opinions. I'll post what I find out.want33s wrote:I suggest you try searching "Cowl induction" [Google perhaps] so you have some idea of what you are talking about before you embarrass yourself further.GRPABT1 wrote:
I beg to differ, I think cowl induction scoops take benifit[sic] of low pressure zones {???}created by there[sic] design and by having the air filter in this low pressure zone the engine sucks are[sic] more effectively. I doub't[sic] there would be a build up of pressure from a cowl scoop even on a[sic] almost verticle[sic] style windscreen like the sierras. I think the desired affect with cowl scoops and no drop in plate for a[sic] air filter is to have air flow through the radiator grill[sic] and out the top for freely instead of hitting the firewall and being forced to go down under the car. Just my opinion.
On the other hand I would love a high mount intercooler with a drop in plate and a combo scoop that forces air down into a drop in plate and out the top of the bonnet through cowl scoop.
By the looks of where it might go all this "Cowl" induction talk wont mean a thing. It would be to far forward to be effected by the windscreen. It would just create a vacuum behind it and suck out hot air. (bit like this thread at the momentcjdeane10 wrote:Heres how it would look - mounted backwards. Probably the best option, and i believe it looks better as it follows the lines of the bonnet better:
)
How did you manage to find totally contradictory statements?GRPABT1 wrote:A quick google came up with these answers:
"The Cowl works better for getting more air, but it too is not a pressure builder like a couple of snorkels in the grill.
There is one thing that you need to be careful of with these cowl hoods. If the carb is not sealed to the hood right, then you can get turbulence in the engine compartment that will actually pull gas out of the carb. You really want an air cleaner made for the cowl hood to seal the hood and the air cleaner to force air in, and not all around the outside. I have heard cars pop really badly because of this turbulence pulling gas out."
"The cowl induction hood is not a new idea and it actually works. That's why NASCAR uses them in their Winston Cup Cars. As the air passes over the opening, it creates a vacuum of cold air over the windshield. This allows the hot air from inside the engine compartment to escape letting the engine breathe cooler air and therefore running stronger and longer."
And yes it does appear the general opinion is it's most affective as close as possible to the windscreen.
Geez you're a hard one to please aren't you? Do your own google search and you'll find them too, there isn't alot on there actually.want33s wrote:How did you manage to find totally contradictory statements?GRPABT1 wrote:A quick google came up with these answers:
"The Cowl works better for getting more air, but it too is not a pressure builder like a couple of snorkels in the grill.
There is one thing that you need to be careful of with these cowl hoods. If the carb is not sealed to the hood right, then you can get turbulence in the engine compartment that will actually pull gas out of the carb. You really want an air cleaner made for the cowl hood to seal the hood and the air cleaner to force air in, and not all around the outside. I have heard cars pop really badly because of this turbulence pulling gas out."
"The cowl induction hood is not a new idea and it actually works. That's why NASCAR uses them in their Winston Cup Cars. As the air passes over the opening, it creates a vacuum of cold air over the windshield. This allows the hot air from inside the engine compartment to escape letting the engine breathe cooler air and therefore running stronger and longer."
And yes it does appear the general opinion is it's most affective as close as possible to the windscreen.
Why don't you quote your sources?
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