Lotus Europa Community

Lotus Europa Forums => Garage => Topic started by: Pete Gossett on Monday,September 24, 2012, 06:06:16 PM

Title: Carburetor sizing?
Post by: Pete Gossett on Monday,September 24, 2012, 06:06:16 PM

I've found the formulas to size carburetor CFM based off engine displacement & max RPM. For the Zetec at 7000rpm, that would be about 245CFM max. From what research I've found, Weber 45 DCOEs flow 400CFM each, which seems massively oversized for the engine?

I've not really heard found any problems from people with 45 DCOEs on a Zetec, other than the need for either the 152G model with 4-progression holes, or the 5-progression hole model. But is there a benefit to going that much larger?

Title: Re: Carburetor sizing?
Post by: LotusJoe on Tuesday,September 25, 2012, 12:00:54 PM

Pete, IIRC I have 40s. I will check.

Title: Re: Carburetor sizing?
Post by: LotusJoe on Tuesday,September 25, 2012, 12:40:52 PM

I was wrong. I'm using a pair of 45s.