fuel delivery differences (HP) |
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fuel delivery differences (HP) |
RonnieJ |
Feb 2 2014, 11:30 AM
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#1
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RonnieJ Group: Members Posts: 230 Joined: 16-June 03 From: Sterling Heights, Michigan Member No.: 829 Region Association: Upper MidWest |
What will a stock 1.7 produce in H.P.with the following.
Progressive 32/36 Weber 40's D-Jet F.I. |
McMark |
Feb 2 2014, 01:30 PM
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#2
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
Gasoline combustion is based on a critical mixture of oxygen and fuel. Too far in either direction (rich/lean) will drop off power. If you do the math, it's 14.7 parts air to 1 part fuel. But since engines aren't math problems, often WOT power pulls perform better around 12:1 or more. But in those cases it's technically incorrect to say that more fuel is making more power. More fuel is overcoming the inadequacy/irregularity of the intake and fuel delivery systems.
The real answer is one of those frustratingly vague responses. Peak horsepower is created with just enough fuel. No more. No less. A progressive single carb gives you one fuel adjustment for the whole motor. So it's wrong most of the time. Kind of like this... A dual carb setup give you one fuel adjustment per cylinder. So it's a little more right, more of the time. Kind of like this... A D-Jet fuel setup is even more right, even more of the time. Kind of like this... A modern, dyne tuned, digital fuel injection system with lots of fuel map resolution is going to be even more right. Kind of like this... |
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