Triples with trumpets

I took the 'sox' off the trumpets today and took it for a blat and it actually seemed to run better however common sense says that there needs to be some sort of filtering for the carbs...any ideas.  It is still a little sluggish in the 1500-200 rpm range but I'll wait until I can put the air correctors in and see if this changes.  Just interested in how others 'filter' their carbs.

Rev.

You've seen my cold air box made out of an RB30 cover, well i'm doing a Version II. Wanna try my old one when im done with it? It will have the backing plate, front cover and a pod filter with it.

The 'sox' on my L20 were worth 4 hp when they were taken off on the dyno, so let's say 6 hp on a good L28, small price to pay on a road car. An airbox, in theroy, should work better, so well worth a try.

i measured the area across the trumpet and went on the search for some,,,, would you believe it ,, tea strainers , cut the handles off and mounted them between the trumpet and the carby body you wouldnt know they were there, tho it did make the motor run a bit richer, and so took them out, havnt ran  anything as far as a filter for 15 years , problem with socks is they can catch fire when the carbs spit back, i used to smear a film of grease on the inside of the trumpet worked well , air box is the way too go

Thanks guys, looks like airbox it is then!

So if you run an airbox like this you guys run trumpets and thats it? What about bugs and stuff getting in the air intake?

Len Brennan runs a perspex airbox without filters on his race car, he has had this setup for 12yrs without any problems. Anything on the end of the trumpets creates extra turbulence at the trumpet face and this affects airflow, so the best setup would be something like scoota's. But, You may struggle with a cold air box Rev due to the length of yours, as I've read the minimum clearace required at trumpet mouth is 1 inch, any less and flow is restricted.

I took the 'sox' off the trumpets today and took it for a blat and it actually seemed to run better however common sense says that there needs to be some sort of filtering for the carbs...any ideas.  It is still a little sluggish in the 1500-200 rpm range but I'll wait until I can put the air correctors in and see if this changes.  Just interested in how others 'filter' their carbs.

Rev.

This is actually pretty common, expecially if you have unifilter type foam socks with oil in them.  Often they are supplied with way too much oil in the foam, which chokes the airflow a lot more than you'd think.  If yours seem really oily, you can try washing the oil out of them, and re-oiling with just a very small amount of oil, and that should improve things a bit. 

Remember though, that a filter by its nature is a restriction, and you'll almost always gain a small amount of horsepower by removing it.  I prefer having them though... I'm not on a racing budget, so prefer not to take the chance on something getting sucked in.

Also interesting can be the effect of an airbox - I was running little motorcycle (paper element) air filters on my throttle bodies in the Alfa while I made the airboxes (V6, one either side).  Before the airboxes, it tended to abruptly accelerate HARD from 3000 rpms, and keep pulling, but with the airbox it softened that feeling of 'coming on cam' and pushed it back maybe 500rpm?  The flipside was it also seemed to increase the lowdown torque, which may have just given the illusion of less power at 3000.....