[DeTomaso] Optimal Air Fuel Ratio Question
Doug Braun
doug at silicondesigns.com
Wed Jun 3 11:57:16 EDT 2009
Does anyone have a table or chart handy showing how many Holley jet sizes you should change per 1000ft of elevation change?
Doug Braun
-----Original Message-----
From: detomaso-bounces at realbig.com
[mailto:detomaso-bounces at realbig.com]On Behalf Of JDeRyke at aol.com
Sent: Tuesday, June 02, 2009 11:24 PM
To: scottcouchman at yahoo.com; detomaso at realbig.com
Subject: Re: [DeTomaso] Optimal Air Fuel Ratio Question
Additional thought: be very careful setting a carb up too close to the
stoichiometric ideal of 14.7:1. If you do this in L.A at 0 ft of altitude and
drive to Reno at 5000 ft, you'll be quite rich and will lose maybe 20% of the
engine's power due to lack of oxygen. So you rejet again, drive to Denver at
10,000 ft and you're again way-overrich and even further down on power.
Rejet once again and drive back to LA, where you burn a valve 'cause you're now
dangerously lean. Carbs outa-the-box are set rich 'cause they have no idea
where you live or where you're gonna go, and warranty returns depress
everyone.
One wonderful thing about EFI is their automatic barometric fuel/air
adjustment. Wish it had come along while carbs were being made.... J Deryke
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