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Impco 425 


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 Post subject: Impco 425
Posted: Tue Aug 16, 2011 12:44 pm 
Oompa Loompa

Age: 50

Posts: 31

Joined: 16th Sep 2009

Ride: Ford maverick 351

Location: Katherine
NT, Australia

Hi all,

Does everyone that has a 425 fitted to a V8 (351C) have a feed back system, is this the only way of getting reasonable economy, maybe more than 150km from 95lt usable..

The way I see it is if the AFR (16.5) is correct across the rev range all is good, wouldn't any feed back system not work or lean off the supply.

Just not sure how to improve economy. :|
 Post subject: Re: Impco 425
Posted: Tue Aug 16, 2011 8:00 pm 
Getting Side Ways

Posts: 6449

Joined: 11th Nov 2004

16.5:1 far to lean. Even more so if you are using a regular AFR meter that displays on the petrol scale.
I'm surprised you're not having major back fireing problems.

too lean will cause poor economy just as much as too rich

All a feedback system is going to do is aim for stoich at cruise.




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