Why aren't car carburetors more like those of lawnmowers?

Question

and all small engines...you can start a lawn tractor up dead cold and instantly take off and go mowing...you don't have to wait for it to warm up. and there's never any adjustment needed on those...why can't car carburetors be this easy?

Answer 1

The older ones were. Oil companies made sure the best carbs were kept out of distribution. The older asperated carbs were very reliable. All parts were brass and aluminum and they never really gave any problems. You could change asperator tubes to change the mixture or fuel type. Older tractors had asperator kits to burn oil rather than gas. Poor farmers would burn used motor oil in their tractors after starting them on gas. I prefer the Webers because of the simplicity and availability. If I had my choice, though, I would go with a fully asperated carb rather than a venturie type carb to get better economy and to burn different fuels. I feel your pain.

Answer 2

It has to do with your carburetor on your car. It is more an art than a science to tune a car's carburetor. There are air bleeds, idle air screws, power valves, boosters, accelerator pumps, etc. This is to deal with the constant acceleration and deceleration that a car has to do that a lawnmower does not, but they play a part in your car's starting. The main difference is in accelerator pumps. All cars have them and very few lawnmowerd do. If your car didn't have one, it would stumble when you mashed the gas, and then slowly, gradually accelerate. A lawnmower carb is a straight piece of pipe with a throttle blade and a fuel needle in it. They can run at a constant speed just fine. The carburetors that were put on cars that resembled mower carbs was the Stromberg 97s, and they quit them in the 1940's.
Two strokes (most weed eaters and chainsaws) light better than four strokes (cars and virtually all lawnmowers are four strokes), because they have combustion every time the piston goes to the top, while a four stroke has combustion half the time. You know you have a two stroke if you mix oil with the gas.
Air cooled engines tend to be harder to start than gas engines. The block needs to expand more, so the clearaces are looser on the piston and rings, which creates lower compression.
Lastly, there is far more to starting than carburetors. There is ignition timing, compression, fuel pump prime, starter strength, etc.
And if you have a quadrajet on your car - forget it. They will never work right.

Answer 3

are there still cars with carburetors? I thought they were all fuel injected by now. A car carburetor is/was much more complicated than a lawn mower's to adjust to different engine rpm's and sudden bursts of speed.

Answer 4

a lawn mower normally works at one speed or revs.
a car has to accelerate and it takes more of the engine to get a heavy vehical moving.
that's why you need a carb. who adjusts to that.
and it's not necessary to warm up a car for "half an hour"
just don't rev it up to much for the first 3-5 mins.

Answer 5

uncomplicated suggestions relatively; yet lawnmower technologies is plenty nearer to Fifties motorcycles than todays automobiles. Or yesterdays for that rely! It won't ever be time wasted nevertheless.

Answer 6

I've always ben able to do all those things with my carburetted car. It's hard on the bearings & pistons though. Same with lawn mowers.

Answer 7

these are not high tech space ships that can go at a moment's notice. we have the technolgy to make a car but make it go from 40 below to all warmed up is beond us cause you aliens have been too busy with the asse probes. now cut that out and give us the tech we need to make it happen or else we will make your space ships have to be warmed up like our old cars

Answer 8

most lawn mowers are air-cooled two stroke engines... most cars are liquid cooled four stroke engines.... air cooled engines need little to no warming up

Answer 9

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