[DeTomaso] SPC - Do headers affect scavenging in individual cylinders?

[Dave Londry]

In addition to equal length runs,  the F1 guys are said to taper 
everything by the individual cylinder.
Maybe a bit more noticeable when you're pulling 800HP from 150 ci at 
19000 revs though.
dave
6143

Ken Green wrote:
> I was looking at some headers and it occurred to me that the interaction of pulses in the collector might affect scavenging differently in individual cylinders.  While it might not produce a noticeable effect on HP, it might cause some cylinders to receive more fresh air than others.  That might not matter with a carb which mixes fuel and air based on the air flow, but with direct port EFI if the same amount of fuel is injected into each intake port, it seems like some cylinders could run lean?
>    
>   Might be an argument for equal length 180 degree headers on an EFI motor.
>    
>   Maybe use a second set of big injectors in a plenum that feeds all the cylinders?
>    
>   Maybe it's such a small effect that it doesn't matter?
>    
>   Ken
> _______________________________________________
>
> Detomaso Forum Managed by POCA
>
> Archive Search Engine Now Available at http://www.realbig.com/detomaso/
>
> DeTomaso mailing list
> DeTomaso at list.realbig.com
> http://list.realbig.com/mailman/listinfo/detomaso
>
>
>   

-- 
Dave Londry
Embedded Spaces Inc. (ESI)
davel at emspace.com

604 721 2278 cell
604 589 9183 phone/fax
Skype:embeddedspaces