Airbox options

[black_potato]

Hi,

The airfilter on my Griff is the foam piper cross tune type and is open to the engine bay as a result I expect inlet temps are higher that they should be.

Have a dig online I believe later Griff's and maybe mine were fitted with an airbox that was a bit rubbish quality wise.

With all that in mind is there a good solution out there?

TIA

Richard

[Classic Chim]

So the Griff one is not in front of the radiator then,,,, interesting.
Do you have a picture of your filter position.
You don’t get to look under many Griff bonnets these days

I good rule of thumb would be to go for a drive on a warm day and after some consistant speeds of say 50 mph pull over and quickly check the Plenum top and it should be pretty cold. It will start to heat up when cars stationary very quickly mind.

If it’s warm I think your right. You need more cold air flow.
Mine is stone cold when doing this little test but hot within minutes when stationary and a normal function of the Plenum that draws heat away from heads.

[black_potato]

I believe for the early Griff there was a simple heat shield, I could try that but as its open at the ends I expect its use will be limited.

[steve-V8s]

I have seen that arrangement on a Griff before but only on a early one. Later cars had an air box over a flat filter which sits in an oblong hole in the nose. It looks as if your car has the oblong hole under the filter. The box was held in place with a rather poor clamp down bracket arrangement so if your car has a threaded hole either end of the air hole then I guess it originally had the air box.

The main flaw with the original system as I see it is the pipe gets squeezed by the bonnet as per the witness mark in your picture. It is possible to cut two holes in the inner wing and duct the air from the filter to the pipe with less restriction. I did that and made a fibreglass duct to take the pipe at each end and glassed it all in place.

[Hedgehopper]

Your car appears to have a very non-standard air filter arrangement. Being a serp. engine I think it should have a fibreglass air filter box and panel filter as below. This arrangement, whist difficult to access, does mean that only cold air is drawn in to the plenum.








If you don't mind a non-standard appearance then a much better place would be to fit your cylindrical filter under the headlight where there is plenty of room.

[black_potato]

steve-V8s said:

I have seen that arrangement on a Griff before but only on a early one. Later cars had an air box over a flat filter which sits in an oblong hole in the nose. It looks as if your car has the oblong hole under the filter. The box was held in place with a rather poor clamp down bracket arrangement so if your car has a threaded hole either end of the air hole then I guess it originally had the air box.

The main flaw with the original system as I see it is the pipe gets squeezed by the bonnet as per the witness mark in your picture. It is possible to cut two holes in the inner wing and duct the air from the filter to the pipe with less restriction. I did that and made a fibreglass duct to take the pipe at each end and glassed it all in place.

Interesting..

Would you have any pics of the re routing you have done ?

[steve-V8s]

I don't have any pictures but was inspired by a mod done by V8racing on here to a customers car which looked very much like the picture above with the red pipe emerging from the wing. That car had if I remember correctly a cone filter on the end of the red pipe tucked somewhere behind the headlamp.

I preferred to use the original filter so cut two holes. One behind and one in front of the rad and spent a while forming an mdf buck which I could thread in one hole and out the other with a nice gentle curved surface to ease the airflow. With that done I then used it as a mould and made a fibreglass duct and glassed it all in place. Ran with that for while but did it differentially when the throttle bodies went on.

[black_potato]

Interesting pics hedgehopper.. thanks.

The short term option would seem to be to get the OEM airbox that I expect somebody has removed in the past. Longerterm I'm not adverse to modifying things to get a good solution so may look into that.

After the mod how easy is it to get to the filter to service/clean it?

[Hedgehopper]

black_potato said:

Interesting pics hedgehopper.. thanks.

Longerterm I'm not adverse to modifying things to get a good solution so may look into that.

After the mod how easy is it to get to the filter to service/clean it?

I haven't moved the air filter to the inner wing as yet, it's just an idea at the back of my mind for the future. If you have ever removed the windscreen washer bottle and mounting plate you will have seen the carbon cannister and how big it is. The n/s inner wing is empty except for the headlight pod which of course you would have to avoid. This mod would offer a shorter route with less bends and if designed carefully could be easier to access for cleaning.

Someone may already have done this, perhaps the owner of the car with the red spout pictured above?