Try this in Excel

CCs HP per CC Atmo Boost Approxomate BHP

1994*0.00472807*(14.7+14.7)=277.1764947
1994*0.00472807*(14.7+15.7)=286.6042667

That's
CC=Cubic Centimeters of displacement
HP per CC=How efficient you engine is
Atmo=Atmospheric Pressure in PSI
Boost=Well, boost (in PSI)

If you've made engine changes, you can see how much your efficiency has increased with some algebra and rolling road data. Or project what will happen with more boost. Or more displacement. Or less boost for that matter.

The base efficiency number of 0.00472807 is faily high, representing an engine with close to 100% Volumentric Efficiency. Not sure about Thermodynamic Efficiency - perhaps 15%? Exhaust gas temperatures are 750-800 degrees Centigrade, after all.

 

Come on Soren, that's common knowledge!

Stef.

 

LOL Stef!

Richard

 

so if you go for a 2.2 stroker kit will you retain that same engine efficiency ? if not what does it depend on ?


[This message has been edited by Sam Elassar (edited 22 April 2001).]

 

Hi Sam,

Your engine efficiency should be very similar.

The key to the stoker kit would be to keep the "squish" area unaltered. BPM has a very good reputation by all accounts and I can't imagine that they would make a mistake there.

Are you considering getting the stroker kit? What else have you done? There are less expensive ways to see 30HP (depending upon how much you've already done of course).

Soren

 

hi soren
a stroker kit maybe on the menu if my engine blow up and i have rebuild it kinda thing. right now i have a my99 uk car with
full decat
vf23
link ecu running 1.25bar
the car was dynoed at 280bhp and 280lb/ft

and hopefully funds permitting i should be getting a FMIC in the next month or so.
how about your self ?

how about your self

 

Hi Sam,

Here's me: