Will the Racer Walsh Cannon intake improve MPG?

[borlax]

I figured out the problem with my Weber 32/36, on the long sides between the casting seams it was raised up, like improper casting. So it leaked vacuum on those spots. I had it milled and that fixed it. My question now is will the Cannon intake manifold from Racer Walsh improve my MPG? I know it has a better flow and that's why I'm asking. If i was to buy it I would like to put a 1 inch spacer block between the carb and manifold. Thanks for any replies

Intake: http://www.racerwalsh.zoovy.com/product/RWA1118/manifold-canon.html

Spacer: http://www.lceperformance.com/LCE-Pro-Spiral-Spacer-1-Weber-Carb-Spacer-Kit-p/1033023.htm

 

[RonD]

In principle it could but.............it really depends on your driving habits.

In a carb setup the fuel is mixed with the air at the throttle plate, then travels down the intake to the valves, some of this air/fuel mix will end up on the sides of the intake not in the cylinders, and since the intake is always full of air/fuel mix, some will be in contact with the closed very hot intake valve's back side and will carbonize, so all this reduces MPG.

Longer intake will remove more air/fuel, more surface area, smoother sides in intake will reduce this, that is the point of port and polish, reduce the rough sides and less fuel is lost, but this is mainly done for power reasons.
This is where your driving habits come in, lol, gaining more power is a temptation to use it , and that will reduce MPG

Atomizing fuel sounds good, but isn't really a selling point, your carb should be doing that now, if it isn't then it is a carb issue, adding anything won't help that, fix the carb.
Air/fuel mix is a by weight, not a by volume mix, this is why "pre-vaporizing" fuel devices don't really work, it sounds good but laws of physics kick in and it falls on it's face.
This is why you can add more fuel to cold air, cold air is denser, heavier, so more fuel can be added(by volume) producing more power, warm air "rises" so is less dense, lighter, so less fuel can be added(by volume).

Your money might be better spent on fuel injection(EFI), often better power but always better MPG.
EFI has two upfront advantages, first is that the air/fuel mix is done at the intake valves, so intake itself isn't layered with air/fuel, and since air/fuel is not just sitting in the intake there is less chance of carbon build up on back of the intake valves.
Second and biggest MPG gain is that the fuel injectors can be shut off when coasting, when you take your foot off the gas pedal and RPMs are above 1,100 RPM the computer turns off the fuel injectors, then restarts them if you put your foot on the gas again or below 1,100 RPM to idle.
In a Carb set up fuel is flowing when engine is running, period, if you take your foot of the gas pedal, throttle plate closes, but air flow is still sucking fuel from the jets.
And you spend 1/2 the time accelerating and 1/2 the time decelerating, except in my town, I spend 1/4 time accelerating and 1/4 the time decelerating, and 1/2 my time sitting in TRAFFIC!!!!, lol.
Rant over, so EFI saves the most fuel by simply shutting off fuel when it isn't needed.

3rd benefit of EFI is real time air/fuel mix adjustments using sensors, although a well tuned carb can get as good an MPG level in real time mix, problem with carb is that you have to keep adjusting it to maintain the same MPG

 

[Kenneth S]

In principle it could but.............it really depends on your driving habits.

In a carb setup the fuel is mixed with the air at the throttle plate, then travels down the intake to the valves, some of this air/fuel mix will end up on the sides of the intake not in the cylinders, and since the intake is always full of air/fuel mix, some will be in contact with the closed very hot intake valve's back side and will carbonize, so all this reduces MPG.

Longer intake will remove more air/fuel, more surface area, smoother sides in intake will reduce this, that is the point of port and polish, reduce the rough sides and less fuel is lost, but this is mainly done for power reasons.
This is where your driving habits come in, lol, gaining more power is a temptation to use it , and that will reduce MPG

Atomizing fuel sounds good, but isn't really a selling point, your carb should be doing that now, if it isn't then it is a carb issue, adding anything won't help that, fix the carb.
Air/fuel mix is a by weight, not a by volume mix, this is why "pre-vaporizing" fuel devices don't really work, it sounds good but laws of physics kick in and it falls on it's face.
This is why you can add more fuel to cold air, cold air is denser, heavier, so more fuel can be added(by volume) producing more power, warm air "rises" so is less dense, lighter, so less fuel can be added(by volume).

Your money might be better spent on fuel injection(EFI), often better power but always better MPG.
EFI has two upfront advantages, first is that the air/fuel mix is done at the intake valves, so intake itself isn't layered with air/fuel, and since air/fuel is not just sitting in the intake there is less chance of carbon build up on back of the intake valves.
Second and biggest MPG gain is that the fuel injectors can be shut off when coasting, when you take your foot off the gas pedal and RPMs are above 1,100 RPM the computer turns off the fuel injectors, then restarts them if you put your foot on the gas again or below 1,100 RPM to idle.
In a Carb set up fuel is flowing when engine is running, period, if you take your foot of the gas pedal, throttle plate closes, but air flow is still sucking fuel from the jets.
And you spend 1/2 the time accelerating and 1/2 the time decelerating, except in my town, I spend 1/4 time accelerating and 1/4 the time decelerating, and 1/2 my time sitting in TRAFFIC!!!!, lol.
Rant over, so EFI saves the most fuel by simply shutting off fuel when it isn't needed.

3rd benefit of EFI is real time air/fuel mix adjustments using sensors, although a well tuned carb can get as good an MPG level in real time mix, problem with carb is that you have to keep adjusting it to maintain the same MPG

X2 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^

If you want to experiment (and have the cash to do it) adapting a Holley 350cfm 2bbl carb on it will give you more power, and mpg, but you have to take the time to tune the carb. My 86 supercab with a 2.3 I get 22mpg in the city, and up to 27mpg on the hwy with a 350 Holley 2bbl driving it by being real easy on the throttle.