float level vs. rich & lean
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Fleet Mechanic
Joined: Nov 2004
Posts: 1,857
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From: Northern CA
float level vs. rich & lean
Could someone splain how float levels in a holley and a rich & lean condition exist. Correct me if I'm worng but, my understanding is that the fuel comes through the jets at the bottom of the bowl. And unless the bowl runs out of fuel, no lean condition could result, right? How could a high float setting result in a rich condition? I've read books that indicate how to set float levels, but have never read the result of an incorrect float adjustment.
Thanks in advance for the education,
gw
Thanks in advance for the education,
gw
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Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
A high float level will cause fuel to spill over into the vent and into the barrels causing it to flood. Too low will cause it to starve for fuel under high demand causing a lean condition.
The jets are near the bottom of the metering block. The jets regulate the maximun amount of fuel available to the booster venturi's. At an idle fuel flows thru the jets into the idle circuits which are regulated by the mixture adjusting screws on the sides of the metering block in the front.
Once at part throttle, when enough air is drawn into the barrels, the vacuum pulls fuel thru the boosters into the engine. Too big a jet and too much fuel is drawn in, too small a jet, and not enough fuel is available causing lean condition.
A ratio of 14 to 1 air to fuel is ideal for a basically stock engine. With forced induction such as a supercharger or turbo charger, under boost, around 12 to 1 air to fuel ratio is used to keep the cylinders cooler and reduce detonation.
The jets are near the bottom of the metering block. The jets regulate the maximun amount of fuel available to the booster venturi's. At an idle fuel flows thru the jets into the idle circuits which are regulated by the mixture adjusting screws on the sides of the metering block in the front.
Once at part throttle, when enough air is drawn into the barrels, the vacuum pulls fuel thru the boosters into the engine. Too big a jet and too much fuel is drawn in, too small a jet, and not enough fuel is available causing lean condition.
A ratio of 14 to 1 air to fuel is ideal for a basically stock engine. With forced induction such as a supercharger or turbo charger, under boost, around 12 to 1 air to fuel ratio is used to keep the cylinders cooler and reduce detonation.
