Air filter size vs power

[SP33DY]

Just another quick question to help me in my search for 300bhp.

Obviously we know Scoff stole his air filter from a oil tanker but for a modest 300bhp Whats the best size?

[rs250nut]

Just another quick question to help me in my search for 300bhp.

Obviously we know Scoff stole his air filter from a oil tanker but for a modest 300bhp Whats the best size?

Size in terms of surface area of the actual filter its self or the hose diameter? I would say that most aftermarket filters fitted to gtt's would flow 300hp these have a sive of around 54mm. Wrc cars make a tad over 300hp with a restrictor fitted.

[Mart]

Whats the best size?

The largest you can fit.

[SP33DY]

One group A cosworth filter in the post then :cool:

[markey b]

surely the 52mm pipe is a restriction, and a massive one and a half sized one shouldn't really make any difference?

i'd be more worried about where it goes as opposed to how big

[Chris Hebden]

The largest you can fit.

Do you not have to keep in mind dragging warm air into the inlet?

[Mart]

Of course, but I assumed Speedy would be aware of that already. Likewise for the location.

[Chris Hebden]

Out of interest, would sometimes fitting a smaller air filter (bigger than the inlet pipe so it wasnt a restriction) be better if it was sucking in colder air? I guess what i am trying to get across, is volume of air or temperature more important?

[Mart]

Both are important, but if it was one or the other (highly unlikely), you'd choose volume otherwise you'd be starving the engine of air.

[Chris Hebden]

Nice one, thanks!