Scott Speirer wrote:

Just writing to say that I haven't been ignoring the responses to questions I had on "matching
a turbo to the 13BT".  I've just been busy at work lately.

Paul, thanks for the info and performance graph from the mecanair brochure.  A picture - or
graph - is worth a thousand words.  And thanks, Jeff and Hans, for info from your experience
with turbos..

By the way, I called the people at Spearco to ask about pressure drop through their
intercoolers.  For core assembly 2-235, which includes one 2-180 intercooler, the pressure drop
at 400 cfm flow rate and input pressure of 19.7 psi absolute is only 3/4 psi.  Not bad at all.
I did forget to ask what the exchange efficiency is, though ... kind of important.  May call
them again to ask that.

Scott

Also ask them what the pressure drop is the other way. Or better yet: What is the
cooling air flow rate through the intercooler per square inch or per square foot when
the pressure difference is only 0.08 psi? That is about the pressure difference
across the
core  you will get in a 80% efficient diffuser inlet duct from dynamic pressure alone
at 80 MPH climb speed. At 100 MPH you will get only about 0.15 psi.
Putting those pressures in terms of inches of water they are about
2 inches or about 4 inches of water respectively. Not much. I would 
settle for the velocity of the air coming out the back side at 80 and 100 MPH
when mounted in a typical duct. We need the same type info on rads.

Paul Lamar
 
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