Wes,
and I have photo and video proof of that incident.
Tom, sweet!
Tom, sweet!
-
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Archive through May 04, 2012
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cmwkrill
Well-known member
- Joined
- Apr 8, 2012
- Messages
- 213
- displayname
- Charles Matthew Wayne Krill
Don't those K series engines need some kind of backpressure on the exhaust? I was thinking about straight piping mine, but a little red warning flag is going off in my head.. It would probably be louder than HE** too. although, that's kind of the point.
CHARLES - The "engines need backpressure in the exhaust" is an urban legend, and like most urban ledgends, it's false. Yes, there may be a few cases where an engine with a muffler makes more HP than one without, But were the carb settings adjusted for the freer breathing exhaust? I doubt it, or the ignition timing? Doubt that too.
Engines operate by burning fuel & air in the cylinder to heat air so it expands and builds pressure that forces the piston down and create torque by way of the connecting rod & crankshaft. If there's pressure left in the cylinder the engine can't take as much fuel/air in the next time so can't build as much heat, or cylinder pressure, therefore less torque, less HP.
There are things you have to be careful of when running a straight pipe, the in rush of cool air when you shut the engine off can cool the exhaust valve too quick and cause warping, which is bad because it can't seal in the new fuel/air mixture. Mufflers help delay that in rush of cool air, help hold heat in the engine. So a long cool down period is needed when the engine is worked hard, plus some way to stop or slow the cold air from getting in the exhaust.
I've had a straight pipe on my K321 for 5-6 yrs, run it about 160 hours, yes it's loud.... and like you say.... That's kinda the point!
Hearing protection is advised. I wear headphones connected to my AM/FM/Cassette deck when I run the 72 w/K321. I don't have any neighbors close to my house, so the little added noise isn't a problem.
Engines operate by burning fuel & air in the cylinder to heat air so it expands and builds pressure that forces the piston down and create torque by way of the connecting rod & crankshaft. If there's pressure left in the cylinder the engine can't take as much fuel/air in the next time so can't build as much heat, or cylinder pressure, therefore less torque, less HP.
There are things you have to be careful of when running a straight pipe, the in rush of cool air when you shut the engine off can cool the exhaust valve too quick and cause warping, which is bad because it can't seal in the new fuel/air mixture. Mufflers help delay that in rush of cool air, help hold heat in the engine. So a long cool down period is needed when the engine is worked hard, plus some way to stop or slow the cold air from getting in the exhaust.
I've had a straight pipe on my K321 for 5-6 yrs, run it about 160 hours, yes it's loud.... and like you say.... That's kinda the point!
Hearing protection is advised. I wear headphones connected to my AM/FM/Cassette deck when I run the 72 w/K321. I don't have any neighbors close to my house, so the little added noise isn't a problem.
Hello all, new member here. Thought I would share a couple pics of my cubs, and a little background. About 13 years ago my dad gave me a 77 1000 series. I mowed with it every year, it always ran beautiful, but the chassis was starting to show it's age. A freind gave me his 78 which was in excellent shape, but had engine problems. So I parked them together and started tearing intu them. I wound up switching engines, and a few other things and now my 78 runs great. So good that since I got it done, my lovely wife now hops on it and mows while I'm at work. I dont get any seat time! Now my 77 is going to be parked at my dads cub graveyard, as a complete parts tractor. After I finished, I realized how much fun I've had messing with these little tractors, I thought I would join a forum, so here I am. Thanks for having me everyone, this is a wonderful site.
Richard,
Welcome to the forum. You will be putting that second tractor back in operation if you stick around here for long.
I like the quote in your profile. I didn't know ol' Ben was so smart.
You can resize pictures in Windows easily. Just right click and pick "resize" off of the menu.
Welcome to the forum. You will be putting that second tractor back in operation if you stick around here for long.
I like the quote in your profile. I didn't know ol' Ben was so smart.
You can resize pictures in Windows easily. Just right click and pick "resize" off of the menu.
Thanks. Just a little operator malfunction
I'll get it eventually. Ken, I believe you are right, I've got a lead on 2 more wide frames, and a few more attachements! Presently I'm in the middle of gutting an old farmhouse, rebuilding completley, moving out of my present home and garage. Turning the old pole barn intu an insulated garage, some tlc for a jeep that desperatly needs it, and yeah 3 acres to get in mowable shape. Needless to say, computer time is in short supply these days. Busy, aren't we all. I'm really looking forward to be able to use and enjoy a few of these cubs, instead of buying a nice new ($$$$) mower, I would prefer to do it with a tractor I can work on, and we all have to agree, is pretty neat to boot.
Your not gonna believe this!
We just had a guy sign up with the last name (Cubeta).
And he's legit!
We just had a guy sign up with the last name (Cubeta).
And he's legit!
Having trouble posting pictures. I am using my new kindle fire and I cannot find an app that allows me to RESIZE photos the right way so I can just tell it to make photo under 100 KB of memory . Does it also need to be under 640x480 size?
Thanks.......Ed.
Thanks.......Ed.
sblunier
Well-known member
- Joined
- Aug 4, 2006
- Messages
- 4,829
- displayname
- Steve Blunier "Mr. Plow" (Central IL)
Denny,
I'm sure you know who I was talking with...but I will 100% assure you it was in the context of stock engines and CI flywheels...hence the warning.
Those 200 rpm's may or may not make a difference...but when you plow like we do, I'll take them!!
Also, I woudl never consider running a tired engine quite that stout.....and would never reinstall a damaged flywheel (ouch!!!)
I'm sure you know who I was talking with...but I will 100% assure you it was in the context of stock engines and CI flywheels...hence the warning.
Those 200 rpm's may or may not make a difference...but when you plow like we do, I'll take them!!
Also, I woudl never consider running a tired engine quite that stout.....and would never reinstall a damaged flywheel (ouch!!!)
Ok, here she is home for the first time, ain't she PURDY'!
Picked it up yesterday (5 hours of driving) for $200, which I thought was a good price. She is missing the gas tank assembly, the motor was loose and the driveshaft drift pin broken (at flywheel flange). It looks like a replacement engine which is getting no spark but turns over with compression. Also missing was the carb' and air cleaner assembly. The rear spins freely too even with the bypass valves up (took them off and freed them up). You can spin the driveshaft by hand at the rear and nothing happens.
So needless to say it has some real issues. But it does seem like it has real nice paint and stickers like it was always garage kept. I like the hydro lift option. The 1250 I had years ago didn't have that. Seems like a well built machine.
Picked it up yesterday (5 hours of driving) for $200, which I thought was a good price. She is missing the gas tank assembly, the motor was loose and the driveshaft drift pin broken (at flywheel flange). It looks like a replacement engine which is getting no spark but turns over with compression. Also missing was the carb' and air cleaner assembly. The rear spins freely too even with the bypass valves up (took them off and freed them up). You can spin the driveshaft by hand at the rear and nothing happens.
So needless to say it has some real issues. But it does seem like it has real nice paint and stickers like it was always garage kept. I like the hydro lift option. The 1250 I had years ago didn't have that. Seems like a well built machine.
