 fuel delivery differences (HP) |
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| 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. |
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| 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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| Mike Bellis |
Feb 2 2014, 02:10 PM
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#3
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Resident Electrician Group: Members Posts: 8,345 Joined: 22-June 09 From: Midlothian TX Member No.: 10,496 Region Association: None 
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QUOTE(McMark @ Feb 2 2014, 11:30 AM)  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... Great analogy! (IMG:style_emoticons/default/smilie_pokal.gif) |
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Posts in this topic
RonnieJ fuel delivery differences (HP) Feb 2 2014, 11:30 AM
brant not answering your question exactly
but its more a... Feb 2 2014, 11:41 AM
RonnieJ
not answering your question exactly
but its more ... Feb 2 2014, 01:06 PM brant
not answering your question exactly
but its more... Feb 2 2014, 01:55 PM McMark Assuming they could all be tuned perfectly, about ... Feb 2 2014, 12:33 PM ConeDodger
Assuming they could all be tuned perfectly, about... Feb 2 2014, 01:02 PM ChrisNPDrider
What will a stock 1.7 produce in H.P.with the fol... Feb 2 2014, 02:19 PM RonnieJ Thanks all for the lesson. Never can learn to much... Feb 2 2014, 02:20 PM bzettner
What will a stock 1.7 produce in H.P.with the fol... Feb 2 2014, 03:40 PM |
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