However, I have recently noticed several cars (including Vicarage restorations) fitted instead with 'short ram pipes' that have a kind of spherical grating to presumably act as a filter. These are being sold by Burlen who are the SU supplier.
Does anyone know of these, and how they compare to the traditional air trumpets in performance?
PS I tried to upload an image but it didn't want to.
Mercedes A45 AMG
Mercedes AMG GLC43
My car had 2" carbs from new, it was built by Jaguar for a racing driver, and has several other non-standard features.
When I bought it nearly 10 years ago, the previous owner had used circular wads of felt to give some sort of filtration, but my research discovered that in racing the air trumpets would not usually be covered at all. I found out that CMC were fitting foam 'socks' to cars they restored with open air intakes to filter out grit, etc. in daily driving, so bought a pair myself.
I was just wondering if the perforated chrome "shower heads" I have now started to see on some cars would be any better.
Thanks for your interest.
I have had a look on the Burlen website and all I can see are trumpets fitted with a mesh domed cover, these do not provide any effective air filtration.
There is not a lot of room in a MK 2 between the wings and the carburettors. However it may be possible to use the same system that Aston Martin used on it's DB4,5 and 6 cars, This was a rectangular air duct bolted to the carburettors but with trumpets fitted inside the air duct. This was then connected to a remote air cleaner using a flexible duct hose.
They also show K and N pancake type filters which is another option?
Trumpets, if of suitable radius at the flare, do aid breathing. Mesh covers, of any flavour, ruin breathing and don't filter! The amount of debris ingested by an engine without filters is quite terrifying, and forms an excellent grinding paste when mixed with fluids in an engine. In the 'old days' of Cosworth DFVs in F1 an unfiltered engine would lose around 50hp after one race due to wear caused by such muck.
The large circular paper cleaners, as fitted to 3.4 Mk2s etc, breathe well and are excellent filters. They also silence the intake effectively.
Due to limited space there's not a lot on the market that will do as good a job as the standard fitment, so you'll probably need to use stub stacks (short, radiused thingies like miniature trumpets) inside a plenum fed by a remote filter.
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