[alfa] Re: Quadra flow and horsepower

[NortonMarg@xxxxxxx]

In a message dated 10/8/03 1:25:15 PM Pacific Daylight Time, 
owner-alfa-digest@domain.elided writes:


> The original claim of "average 7 horsepower increase over the stock Alfa 
> air
> filter", according to the Alfa Ricambi manual, has always been questioned.
> The theoretical increase in flow is offset by the hotter engine bay air at
> the intake, as opposed to the fresh cool air rammed into the spica airbox.
> The solution?  K&N filters for the Spica box.  Proven beneficial?  I think
> not.
> 

John Norman has a dyno list for state of tune, 
stage 1. 1974 - 2000 Spica fuel injection, stock exhaust system, 9.2 CR (head 
cut .020), porting, polishing and valve work, 45mm oversize in-let valves, 
stock cams (105.20), stock air cleaner, 74 ex-system
stage 2. same as stage 1 with Euro cams (105.48)
stage 3. same as stage 1 with 11mm (lift) Pittatore cams
stage 4. same as stage 1 with oversize throttle
stage 5. same as stage 1 with Shankle Quadra flo airbox
stage 6. same as stage 1, with high performance F.I. pump

           Stock     1           2          3           4          5          
 6

3500      86        89         88        85         89        86         88
4000      98         100       99        95         100       98        100
4500      108      116       114       110       115      117       119
5000      118      126       127       131       130      134       140
5500      116      130       135       139       142      146       154
6000      110      128       136       142       147      150       159      
6500                              127      143       146       155       162  
   
7000                                                                  143     
 152

Unless you do a lot of other engine work and change cams, it probably doesn't 
matter.
Stevan Thomas
73 Berlina (with a lot of head work and 10:1 pistons)
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