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What's the difference between an Impco 225 and 425?? 

 

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 Post subject: What's the difference between an Impco 225 and 425??
Posted: Thu Oct 06, 2005 4:59 pm 
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I'l looking at upgrading all the under-bonnet components of my LPG setup and can't really find out the difference. Some places are quoting for the 225 saying that it flows the same and say that's all I'll need, others say they can't even get a 425 to fit... Whereas another place is quoting nearly the same price to fit the 425.

Somebody who knows about this stuff please help!!!

 

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Posted: Thu Oct 06, 2005 5:55 pm 
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I think fuzion knows a bit about the impco gas setups
try giving him a pm?

 

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Posted: Fri Oct 07, 2005 8:49 pm 
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Cheers mate. I'll give it a shot...

 

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Posted: Wed Oct 12, 2005 10:23 pm 
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The numbers reflect flow capacity.
Sizing table (rough);

IMPCO Max.
Model CFM
125 202
175 210
200 276
225 329
300A-1, -20 348
300A-50, -70 432
425 460



225 will provide more accurate tuning & drivability at the expense of power on a 5L or larger NA engine.

425 will reduce the power less compared to the 225, but will not be quite as drivable.


I have a 6 cyl running 6 PSI, and the 225 mixer drops the MAX power level, but a 425 wont physically fit on my engine layout :-((

On a late model engine you should be using an electronically controlled
LPG metering system.

Dave
ENG-TEK
Diesel Performance Centre[/url]
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Posted: Thu Oct 13, 2005 12:44 am 
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Thanks mate. That's pretty much the info I was given... I've gone for the 225 as there was going to be issues fitting the 425. The 225 itself is a much bigger unit than the el cheapo (4 cylinder sized) unit that the previous owner had fitted. Can't wait to give it a burl...

 

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