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Venting the bonnet for Trumpets
Topic Started: Jun 3 2008, 11:52 PM (461 Views)
sabajin
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sabajin
hello guys, let me start this topic by saying that most of my 4age 20v knoledge has came from here, but i have a concern and here it goes.

Ihave 85mm trumpets on my car with air filters. Now i have heard that the air that the trumpet sucks is most of the time hot hot hot. I want to get the most of hp gain with the trumpets so am thinking and been suggested by my mechanic with this ideas:

1. Venting the bonnet.
2. Making an aluminium floor for the trumpets
3. Use that heat wrap on the trumpets.

Will i get all the possible power with those upgrades since the air will be cold?

Thanks in advanced

:cheers:
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BZ-G
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aka Hyper Rev 4...
one suggestion that i can give you since i am also thinking of making cold air for my trumpets too but haven't got the time to do it is....

if you still have the old black box for the penlum, copy/trace the holes of the throttle bodies and bolt holes... and use those and make a aluminum box, something like a wide half cut drink bottle shape and make a scoop which is about 10cm wide and 5cm tall from the bottle and slowly decreasing it to 1cm outlet and curved like a inverted "S" shape so you can fit it where the rear strut brace bolts are and in between the bonnet and the rear fire wall... therefore the air is coming from the wiper area which is cold and of course the box and the inverted "S" shape is sealed from the box too...

hope you understand what i am trying to say... mind you this is my secret box for my trumpets...
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dub-levin
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Stage 6
if your using open trumpets (ie. no cover or filter) i wouldnt sujest using a vent. yes it will get the air in quicker and more of it. but it leave a much greater chance or letting in everything else. dirt water etc. if your gonna use a vent you might want to think about some kind of filter on the trumpets.
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devo
Stage 6
lads wat do yaz think of the trumpets i stil dont no wat to do about a cold air feed as dub fist said i dont want to get rid of the standard box as i be suckin up hot air iv seen these trumpets surely they suck up loads of cold air did yous notice any difference i heard the velocity stacks in the standard box ar good
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dub-levin
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Stage 6
JohnnyBZG
Jun 4 2008, 08:50 PM
Run the Trumpets , but don't cut any bonnet vents, use 3-5 washers stacked between the bolts and the rear bonnet hinges so that the bonnet is vented at the rear.- You'll need to place an air dam behind the trumpets though.

The hot air fed from the front of the engine will be sucked over the top of the engine and expelled from the nice gap you've just created. Suction is better for getting rid of hot air than pushing it -which is what a front bonnet vent will do straight into your inlets.... That's what the air dam is for... to stop the hot air getting to the trumpets
You then need to feed the trumpets with nice cold air, most likely from the original filterbox position by using some corrugated or even solid piping again creating velocity so that you get even air flow to the TBs... Why didn't Toyota rotate the engine by 180 degrees and put the exhaust mani at the back and the TBs at the front?

thats a fantastic idea.
dont see it done anymore. first used buy the USA mussel cars in the 50's and 60's.
creats an area of low pressure in the gap forcing air to be sucked in to fill it. you might even get more boost out of it that way.
or actualy if your going to fit a scoop. do tha muscel car rear facing scoop idea.

Posted Image

something like that but not so severe.
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DreadAngel
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Han Lue
Here is an idea that may or may not work...

If you want to get seriously anal and want to drain your cash =P Nor do I know if it will work...

Say you did vent your bonnet yeah? What about having a induction box that extends from the entire area of the venting then piping towards the trumpets and another box that surrounds the trumpets?

Just an idea but I know this works with my mates NSX who was inspired by the Super GT NSXs hahaha =P

If I find pictures I'll post it up
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kyleseo
Stage 5
JohnnyBZG
Jun 4 2008, 08:50 PM
Run the Trumpets , but don't cut any bonnet vents, use 3-5 washers stacked between the bolts and the rear bonnet hinges so that the bonnet is vented at the rear.- You'll need to place an air dam behind the trumpets though.

The hot air fed from the front of the engine will be sucked over the top of the engine and expelled from the nice gap you've just created. Suction is better for getting rid of hot air than pushing it -which is what a front bonnet vent will do straight into your inlets.... That's what the air dam is for... to stop the hot air getting to the trumpets
You then need to feed the trumpets with nice cold air, most likely from the original filterbox position by using some corrugated or even solid piping again creating velocity so that you get even air flow to the TBs... Why didn't Toyota rotate the engine by 180 degrees and put the exhaust mani at the back and the TBs at the front?


Not so true. The idea of the gap at the back of the bonnet was first designed to draw air in through that gap. If you use washers it doesnt have the same effect as the bonnet is not curved at the back. Using washers also raisies the sides of bonnet which means there is very little pressure difference to aid such an effect.

There has been various bits of research into gapping the bonnet and im as of yet to be convinced. There were some uni lads in the states that did an experiemnt with thermal imaging and found no change in temperature what so ever. There is another test that showed the temperature around the inlet to increase with the bonnet raised. The theory being that hot air doesn't actually cross that area usually, the bonnet up caused hot air to move into that area and the temp went up.

The Bernoulli (sp?) Effect will be less efficient with the bottom raised. i.e. air moving under the car at one pressure draws the different pressured air from the engine bay and out. Bonnet raised means smaller difference in pressure.
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