[DML] Re: Intercooler

["Nick" <nicholden@xxxxxxxxx>]

Thanks for the calculations! They confirm what i also thought, that 
the 4x6 barrel is right on it's limits. I have gone this far with 
the engine and it seems a shame to start cutting corners now. 
I am going to swap the 4x6 barrel for the 6x8 which will flow 970 
cfm at 7psi. 

It just means a bit of clever pipe work but it can be done.

I will post a pic once it's done.

Cheers, Nick






Well, yeah...

Assuming a perfect system (HA!)

Engine is 2849cc 4-stroke, meaning it draws half its capacity every 
revolution

So 5000 x 2849 x 0.5 / 1000 = 7122.5 l/min

(which according to www.onlineconversion.com)

= 251.5 cf/min

Now that's at a pressure of 1 bar (atmosphere) and you are talking 
about 
7psi (14.7psi = 1bar) = 0.48bar of boost

so that's 1.48 x 251 = 371 cfm at 7psi of boost (and what fantastic 
swapping of units I must admit!)

- I'm not sure I'm right about the flow under boost but it seems to 
makes sense to me!

I'd go bigger because the PRV can safely be revved to 6500rpm if the 
breathing's good.

Martin









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