CBR600F-T

I dont know whether to take the blanking plates off my two bonnet vents (UK MY99), they seem easy enough, but why plate them off in the first place?
Also, rather than an IC shield, would it not be easier for me to just put some mesh under the main scoop to stop IC debris damage??

Flame suit on in readiness so do your worst

Andy........ if you dont ask you`ll never know.

[Edited by CBR600F-T - 6/3/2003 12:37:26 AM]

RICH WILD

Hi,

The vents are merely replicas of the WRC cars vents which geniunely are open to the air, so you can take the backing plates out in dry weather. In rain, you'd be wise to put them back in.

Pop Quiz. Why would the WRC teams have open vents if they offered no benefit?

Anything that reduces underbonnet temps is a good thing, especially in this sort of weather. More so, if you have an induction kit.

Cheers

Rich


[Edited by RICH WILD - 6/3/2003 8:42:06 AM]

Arron

Andy,
Think about the mesh on the underside of the scoop, if you get a lot of debris in there it might be a git to get out.

Just thinking.

[Edited by Arron - 6/3/2003 8:48:16 AM]

Brun

One bonnet vent is over the battery and one is over the air filter (bad, if you have induction)
I assume you are looking to decrease under bonnet temps?
If you have induction, this has proved to be a bad idea as the vents will draw hot air straight past the filter.
As for the mesh - why not

Was that bad?

CBR600F-T

thanks Brun, very gentle no Im very standard at the moment (except wheels). have scepticism about induction so panels all the way. (maybe remove one plate only?)

Andy

taylor

What's the point in removing either blanking plate? The only thing you'll gain is water and dirt into the engine bay.

Waste of time if you ask me.

Hanslow

Depends if you want the mesh to stop things going through the scoop onto it, or if you want to stop mechanics leaning on it or using it as a bolt tray (not that they ever do of course )

You can make one yourself for a couple of quid and a trip to Homebase

Foot_Tapper

Mesh idea seems ok to me. Good bit of lateral thinking.

Leslie

I was recently told that the backing plates will still allow air past them and out through the vents.

Les.

Brun

Hot air right past the filter.
I can't remember who did it, but someone did some test using a temp probe and temps around the filter increased by a significant amount IIRC.

ozzy

If you want to protect the IC with some mesh, then make your own. Don't go spending £60 on one of the manufactured ones.

The only question I would have is 'what's the ratio between IC efficiency and the size of the mesh' You obviously want the holes small enough to stop debris, but large enough not to interrupt the airflow much.

The WRC cars use them, but the engine layout is diffrent to your bog standard MY99 car. Removing them no doubt works for them, but I guess they design around that fact. I can't see them being too bothered if it's reliable day-to-day with them removed as they just need to make it to the next service interval between stages.

If you looked at how a bird flies, would you just cover your arms in feathers and start flapping?

The standard air filter is covered in plastic, so won't get wet. Your biggest problem would be the MAF's electrical connection and the battery on the passenger side getting soaked.

Stefan

Jay m A

iTrader: (2)

The WRC cars have FMICs and probably an oil cooler there too, so alot more hot air is coming into the engine bay, I guess the vents help get it out.

So the road cars don't need them (or its a bad thing WRT battery) we just have them to look like the rally car. Funny since the rally car keeps the bonnet scoop to look like the road car...

StickyMicky

what came 1st, the rally car or the road car?

ozzy

At a guess I'd say the road car came first (Nov 1992 saw the first Impreza). IIRC Subaru used to rally the Legacy before then and didn't move to the Impreza until 1993.

Can't find a very early pic of an Impreza to tell if the bonnet vents were there already.

Again if I had to take a guess, they introduced them with the WRC Impreza and brought the 'look' across to the road car. That's usually what happens.

Stefan

jameswrx

iTrader: (4)

When sitting in traffic I can see that more hot air will be drawn past the filter, obviously hot air rises and goes past the air filter while it makes it's way out of the vent.

When on the move though, surely air speed and flow(from car speed) will over power the 'hot air rising' effect and there will be greater airspeed than the rest of the engine bay, as air rushes past the filter and out the vent.

Something like my HKS filter is so thin, it will cool down quickly too. Thats why I run without the vent in now.

Discuss

Turbo_Steve

Of course, you could always modify the blanking plate, with a spacer with one side cut out...for example the back.....which will suck air from that direction...nowhere near the airfilter.....e.g. the nice hot airspace next to the turbo?

barge

I have both mine open.

when in stationary traffic you can see the heat haze coming from them

Brun

..........i would assume that due to Group A regs at the time, the road car would require the vents in order for the rally cars to be allowed them

R19KET

I think you'll find that the WRC vents are used in a very different way to ours. IIRC, the rad', and IC are seperated from the engine bay, and vent out the bonnet vents.

I've run without the blanking plates for as long as I can rememeber, with just a deflector protecting the filter. Never had a problem, nore has anyone else I know.

Mark.

rb5037

I've just had an idea, if you remove the vent plate over the battery then a car theif will thank you.....
How easy is it going to be to cut the battery cable now and turn off the alarm? Unless the alarm has a backup battery.
Just a thought

Adam