MSNZ and rearward facing bonnet vents

[Adoom]

This is really a question for Leon, but any input all good.

I want a vent in my bonnet to let EXTREME!! turbo heat OUT.
Schedule A says a backwards facing vents need to be suitably baffled to prevent the escape of fluids.(So it doesnt go on the window I guess...)
Can someone explain to me this baffling? and how can I baffle it without defeating the purpose of the vent?

[strx7]

that is a million $$$ question right there........

the bottom line is, it all comes down to whomever is doing the scrutineering

[RunningRich]

Interesting as the backwards vents on ST205's are not "baffled".

How do you "baffle" a vent without blocking it??

Above the turbo a ST205 has a large grill. I get huge rushes of steam out of it when going through a puddle.

[Adoom]

Interesting as the backwards vents on ST205's are not "baffled".

How do you "baffle" a vent without blocking it??

Above the turbo a ST205 has a large grill. I get huge rushes of steam out of it when going through a puddle.

Oh yeh. Factory fitted backwards facing bonnet vents are exempt.
Extra/new/aftermarket ones have to be baffled.
I don't have the exact wording. I'm at work, the MSNZ manual is at home.

[d1 mule]

whenever there is anal scrutineers just puit some tape oner it then take it off just before racing, many a drift competetior do it

[B1NZ]

whenever there is anal scrutineers just puit some tape oner it then take it off just before racing, many a drift competetior do it

Good way to get banned from any motor sport if you get caught, Rules are there for a reason, mostly to protect you and any other competitors, Scrutineers are "Anal" for your safety, If they let things go like that and something happens - It makes it harder to get permits for the venue etc again

[Leon]

Ignoring at least one post in here ...

I'd suggest the easy option, fine metal mesh.

OR, just don't have your bonnet vents facing rearward

[RomanV]

Can someone explain to me this baffling? and how can I baffle it without defeating the purpose of the vent?

Are you baffled as to how to go about this?

Well the idea is to obviously stop oil/coolant/etc obscuring your vision if something sprays out of the engine bay.

So just a simple S bend type setup in the path of flow should do it?

Something that will stop a spray of fluids but still let air through...

[Eddy1612]

whenever there is anal scrutineers just puit some tape oner it then take it off just before racing, many a drift competetior do it

Good way to get banned from any motor sport if you get caught, Rules are there for a reason, mostly to protect you and any other competitors, Scrutineers are "Anal" for your safety, If they let things go like that and something happens - It makes it harder to get permits for the venue etc again

some just be anal to be anal

[Adoom]

whenever there is anal scrutineers just puit some tape oner it then take it off just before racing, many a drift competetior do it

Ummm on the track is where I need the heat venting the most.....
It doesnt really get very hot just commuting.

[Adoom]

Ignoring at least one post in here ...

I'd suggest the easy option, fine metal mesh.

OR, just don't have your bonnet vents facing rearward

How will mesh stop the exit of fluids?
Well I could have upwards facing vents but its the same as rearwards.... If it faces forwards im going to get air coming in, not heat going out.

[Adoom]

Can someone explain to me this baffling? and how can I baffle it without defeating the purpose of the vent?

Are you baffled as to how to go about this?

Well the idea is to obviously stop oil/coolant/etc obscuring your vision if something sprays out of the engine bay.

So just a simple S bend type setup in the path of flow should do it?

Something that will stop a spray of fluids but still let air through...

I was thinking of something similar. But before I go and do it, does Mr EX msnz Leon think that it is an acceptable solution that will pass scrutineering?

[Stott69]

I work as a hvac appretice and use lots of different types of filters, i would gess you could use something that would catch everything while keeping air flow to a max. you would need to clean it regulary to keep performace up tho

[Leon]

How will mesh stop the exit of fluids?
Well I could have upwards facing vents but its the same as rearwards.... If it faces forwards im going to get air coming in, not heat going out.

The baffles or mesh aren't about stopping the fluid, otherwise you'd be allowed no holes in the bonnet at all. It's about giving you a gnats cock of warning that the radiator pipe has split so you can get on the anchors before the antifreeze hits the screen and you then drive totally blind.

So, turns out the rule isn't there just to be anal, it's so when people do a mod to their car, it builds a little bit of safety margin into it.

Pretty much stuck with accepting factory set ups unfortunately.

I've watched a car get pulled off the grid on the race track for doing the "tape up then pull off the tape" idea as suggested earlier. He then got to go home for the rest of the day. Not one of his more intelligent ideas.

[Adoom]

Yeh? Nah?

[~SlideWays~]

Best diagram ever... but the weight from the fan motor etc would defeat the purpose of the FG bonnet.

If air is blowing IN to the engine bay via a front facing vent, I'd have thought the air would get sucked out under the car, much like factory plastic covers were designed to do.

[KinLoud]

I've seen a couple of solutions to this problem...
- vents pointed towards the side of the bonnet so any fluids would end up down the side of the car (hopefully)
- can't remember number 2 solution ... will make it up later

For your turbo vent problem... is the problem...
- hot air?
- radiant heat?

Is stuff...
- melting
- breaking
- power loss?

-In a rwd starlet??
-Whats getting hot? (apart from the turbo)
-Insulate turbo as you really want to keep the heat in the turbo = turbo will be more efficient (holistic interpretation of efficiency)
-more heat shielding than you already have, to stop stuff melting if that is your problem

Make an air duct that points directly at the turbo to cool it.



Ken
Auck
021 408 863

[~SlideWays~]

Heh where did you get the pic?

[Adoom]

Heh where did you get the pic?

There are a few places he could have got it from.

[Adoom]

I've seen a couple of solutions to this problem...
- vents pointed towards the side of the bonnet so any fluids would end up down the side of the car (hopefully)
- can't remember number 2 solution ... will make it up later

For your turbo vent problem... is the problem...
- hot air?
- radiant heat?

Is stuff...
- melting
- breaking
- power loss?

-In a rwd starlet??
-Whats getting hot? (apart from the turbo)
-Insulate turbo as you really want to keep the heat in the turbo = turbo will be more efficient (holistic interpretation of efficiency)
-more heat shielding than you already have, to stop stuff melting if that is your problem

Make an air duct that points directly at the turbo to cool it.



Ken
Auck
021 408 863

HEY LOOK!! ITS MY SHADOW!!
Hmmmmm. Its more radiant heat I guess. You could cook stuff in there after a few laps. Really I guess what I want to do is lower the air pressure under the bonnet so I get more flow through the radiator.
Air is only going to flow through vents if there is a pressure difference on one side. Air will go from high to low pressure areas. If you lower the pressure under the bonnet there will be more of a difference to the high pressure in front of the radiator/IC so you get more air flow.
Autospeed did some testing in one of their articles using different shapes of undertray.