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Intake exhaust manifold more

grandpa Love

grandpa Love

Well-known Member
great answers and discussion on the topic below. I learned a bunch. Thanks to all who added to it. One thing I didn't see covered, some of our tractors will fire up and you can take off driving em. A couple of them really like to warm up a bit before moving, if you try to move they splutter and die. Why?
 
I think it's mostly fuel mixture, that why fuel injection works so well, the mixture changes as the engines warm up. On older airplanes there were manual controls for fuel mixture and manifold heat. When I was pretty young I put a Briggs washing machine engine on my bicycle, and had a big handle on the needle valve, rich for acceleration, lean for speed, all the way to about 16 mph!
 
A lot of times it is due to the mixture just being a little richer on those.

My MH44 was always cold blooded, it had a tall manifold, that took a long time to warm up.
 
I believe the airplane reference spawned the term ?Balls to the wall? referring to shoving the knobs of the sticks to the firewall. Not to be confused with ? running balls out? which was the result of adding throttle and making the old governor balls run out from the centrifugal force. Your BS bicycle sounds like every Maytag engine I?ve seen.
 
Probably just a little lean on the low speed needle.
My Jub and 860 do that when temp is cool. A little choke and idle for 30 seconds and they are fine. Just have to let the intake manifold warm up a little.
 
It is not uncommon to open the mixtures up 1/4 turn in the cold months.

Some idle mixtures are open to rich and some are air bleeds, open to lean.
 
(quoted from post at 19:36:27 10/22/19) It is not uncommon to open the mixtures up 1/4 turn in the cold months.

Exactly......I have to open up the high speed jet a little on my WD in the winter.......if I'm workin' her pretty hard, I may have to screw the jet back in for a little.
Click to expand...
 
That's a good question.

And why do some engines start so well, and others are unpredictable?

I've never had anything with a gas engine that started as well as the TO35 Ferguson. It can sit for months, turn on the gas, a very quick choke, bump the starter, and it's good to go!

One big difference is the manifold design. The "siamese" manifolds work best for cold starting. They have the intake and exhaust cast together or bolted together so there is direct exhaust heat transfer to the intake. That is a good thing for cold starts, gets the vaporization process going as soon as the fire lights.

Something I've never understood is how drastic a difference, and methods used, to start a diesel.
 
"Diesel combustion talk tonight?"

Sure! They remain somewhat of a mystery to me, never studied a lot of theory on them, just know a little of the basics of how it works.
 
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