Do you have a link to it?
BEST CARBURETOR FOR STREET OR TRACK?
- Thread starter Hysteric
- Start date
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Wouldn't that just be running the correct air fuel mixture based off of an engines needs,
Not richer ?
Assuming everything else is correct
Nope. Just because you give a cylinder the correct AFR doesn't mean the AFR is evenly spread through out that cylinder at time of ignition. Quantity of fuel (AFR) and quality of fuel mixture (Distribution) are different worlds. As a matter of fact AFR between cylinders can vary greatly even though the carb meters the fuel correctly for a given AFR.
A smaller carb will actually improve distribution because it increases vaporization and the greater the gaseous state the better it follows the intake tract and into the cylinders. Large droplets don't turn corners and end up on the walls.
Dale Davies
Well-Known Member
No. There was a magazine article years ago. Just search Smokeys Hot Air Engine or
Smokey's Adabiatic engine.
Top paragraph yes agreed.
Okay, I forgot this thread was about street engines.
Carry on lol
Dale Davies
Well-Known Member
This relates to the difference between quantity and quality. Homogenous air fuel mix in the cylinders is what is required. Smokey spoke of this concerning the hot air engine.
Conventional thought is that cool air is required to prevent detonation. In his hot air engine the intake air was heated in two stages. He used a turbocharger as a one way valve so the heated air could not back up in the intake and to homogenize the air/fuel. The compressor blades slice the air/fuel into small bits to mix lean and rich portions. Exiting the homogenizer the intake manifold was heated by exhaust to bring the temperatute up to 450°F, which is required to vapourize all fractions in the fuel. The homogenous mixture in the cylinder does not have the tendency to detonation. What allows detonation is a lean bit of air/fuel on the far side of the combustion chamber from the spark plug. As the flame travels the temperature and pressure rise. A lean mixtute has a lower auto ignition temperature than stoichiometric or a bit rich.
The essence of what Smokey related.
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That's very interesting, why aren't racers doing this now?
one Thermoquad for Racing
one Thermoquad for street
one Thermoquad for street
Lol, you're a true Mopar guy
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Dale Davies
Well-Known Member
Time, experience or knowledge.
Here is another thought; David Vizard Powertec 10, Ep 120.
MILO
Well-Known Member
Im still a carter AVS guy alwase treated me good easy to rejet if needed or adjust street or strip the way to go
There are, Larry Widmer will sell you a race engine with 21 to 1 comp.
Not CID limitation but more of a HP limitation. The carb can only flow so much air and fuel. So let’s just pretend a 650 cfm carb is only good to 450hp. Be it a tiny high reving engine or a low rpm big block that both make the same HP, but at different rpm’s.
It’s that simple…. But it’s just not that simple.
Love a good AVS, excellent carb.
I can build my own engine, no need to buy one.
My choice of engine I'm not sure 21 to 1 is physically possible though lol
Forget that a carb has to mix fuel for one second, think of it like exhaust, you want the header big enough that it don't restrict exhaust flow but not much bigger where it hurts velocity, same with Fuel Injection throttle body don't want any restriction. The only difference with a carb is you need some restriction for it to do it's job but no more. But a street vs a racing car the job it required to do is different, more restriction beyond enough for the carb to do what you want is just killing power for no reason, trick is to find the sweet spot. Good thing carbs can work over a wide range of engines and for most close enough is good enough.
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