My Itg filter is ten years old, maybe I should renew it although its still cleans up enough to be able to see the name. The sport sports a cone filter (K&N?). I wondered if any of you have any thoughts on this. Mogsport show an Itg in situe but Techniques no longer seem to recommend Itg. Hmmm. Meabh.

The comments below relates mopre to an injected 4/4 but some aspects are equally common to a plus 4 with injection.
There are a number of inter related issues here: the type of filter element itself ( eg paper, foam, ooiled cotton etc); the siting/packaging issues in terms of picking up a supply of cool dense and non turbulent air

In terms of filter element type, ITG have an excellent name for filtration and flow. I'm not knocking K&N or any of the other makes such as Green, Pipercross etc but in the end I went for an ITG ProFilter element- simply because not only did I get better technical feedback from them ( a very helpful guy there called Andy Jackson) but in all the test info I saw they came out best

The problem which is often found with a a cone filter/ airbox under a trad bonnet is where to site it so that it doesn't pick up warm, turbulent air from the block or the exhaust and to an extent, this is a compromise because the box has to fit into the bonnet space and configuration available

Some dealers reckon that the best place to site to avoid this is on the bulkhead

A way to deal with this same problem is to use a 'closed' induction kit such as the Venom, BMC etc as a way to keep the air in the filter body cool.

Another aspect of this same question is that, in many ways, with an injected car it is good to have the run between the filter box and the MAF sensor as short as possible and not to have the induction pipe into the filter from the air source too long either

I'm still looking at this in relation to my silvertop engine and so far am running an ITG element in the existing fliter housing until I work out exactly what I'm going to do in terms of repackaging the whole thing. My next step might be to stick with the ITG but use their Maxogen housing instead

G

PS if an oiled filter element- of whatever design- is used, it must only be oiled lightly. If it is over-oiled and this gets to the MAF sensor, it will send it haywire

I'm working on this particular problem at the moment...

OK.. I'm not running an injected engine however given I have single rail carbouration (Twin 45's) things won't be that far off.

There is a detailed thread at the following link which may be of use....

http://www.pistonheads.com/gassing/topic...20to%20Airbox??

Personally I'm looking for a positively charged cool air induction system.

Having got the engine re-built and into the 4/4 we spent Sat looking at the alignment of the cyl head in comparison to the inner wing edge and the bonnet.

Suffice to say we think we have worked out how to install a direct +ve charge N/A closed air intake system... as far as I know this would be first of type.... and takes queues from the Aero induction system... all be it in concept.

As far as ITG goes,,, I've also seen them come out top in flow tests when they have been objectively tested I would recommend them if you can fit them in.

It is worth doing a lot of research though as there is a lot about flow, +ve and -ve pressure characteristics that need to be thought of before making changes...

The owner of this car from USA at the Beaulieu Centenary meeting last summer would not declare what was under the bonnet and did not want to take the filters off either.

He seemed embarrassed that he had cut holes in the bonnet to allow his air filters to be on the outside?

Do you have a larger pic...

It looks like Siamesed intake manifold with a single SU on each?? would give this kind of external profile.

Sorry, I cropped a larger picture to get this one which is poor resolution if enlarged any more.

Do you know if it was a TR engined car at all.

Andrew,
I guess we're both singing the same song here- Bell's book on 'Tuning Four Stroke Engines'
regards,
G

Thanks for all the replies. I'll stay with the Itg which is mounted directly to the airflow meter in front of the tool box. What I am trying out is a large trunk which brings air from beside the radiator to an inch or so in front of the filter. It might be wishful thinking but if for example I place it behind the fan it certainly blasts air out. thanks again all of you. Meabh.

Isn't the potential problem with that the likelihood of creating a very turbulent air flow- and also the length of the 'runner' perhaps also moving the BHP curve down the rev band? Just a thought

G