Mowing, full throttle or half?

[IthacaJeff 151]

This from a Husqvarna tractor operators manual (YTH 2046 -- Kawasaki engine I think):

 

 

TO USE THROTTLE CONTROL - D (See Fig.5)

Always operate engine at full speed (fast).

CAUTION: Always stop tractor completely, as described above, before leaving the operator's position; to empty grass catcher, etc.

 

Operating engine at less than full speed (fast) reduces engines operating efficiency.

Full speed (fast) offers the best bagging and mower performance.

 

 

My Kohler magnum 10 in my 310-8 and the K341 in my 416-8 are always WOT.

[km3h 543]

As we all know, men do not read manuals. The only time they look at them is after something breaks or their wife reads it to them.

[km3h 543]

 Duplicate sorry.

Edited September 6, 2014 by km3h

[Catmanii 36]

As we all know, men do not read manuals. The only time they look at them is after something breaks or their wife reads it to them.

My John Deere walk behind mower solved this problem. It does not have a trrottle, when started it goes wide open and that's that.

[Desko 610]

I always run at full rpm and I've heard (never believed it) running at WOT actually uses less fuel than idling or any other throttle positions but I don't know how much of that is true (probably none)

[wh500special 2,249]

I like red's comments about the governed speed and the optimized timing and tuning that manufacturers probably build into their 3600 rpm engines.

I used to think of a governor as something that just prohibited excessive over speeding. Then eventually learned they function to keep the engine at a preset speed (most cases 3600 rpm) adding or reducing throttle as needed. They are a proportional control feedback device, not just something to limit top end (although they do that function too).

Fixed speed engines have fixed speed governors. Generators, pumps, push mowers. Our tractors have variable speed governors that try to hold whatever rpm we select regardless of load. Red's comments remind me that these gov's are probably also tuned to work best over a smaller range which would most likely be the rated rpm for the engines rated power.

They can and do work at other speeds, but you can bet the design team picked spring constants and set gains and deadbands based on operating closest to rated speed.

Interesting stuff.

[Jasen 10]

Sooooo..... What's the best oil to use? LOL

[Racinbob 11,726]

[pacer 3,175]

Sooooo..... What's the best oil to use? LOL

 

Its good you asked about oils -- listed below are 649 posts covering this topic :eek:

 

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[Jasen 10]

LOL I'm not really asking. Just stirring the hornets nest. I know what oil to use.

[clem 28]

Just don't use too much, right?

[Jasen 10]

Actually it was my mother who used too much oil and killed the poor innocent John Deere. When I asked how much oil she put in it, she said, until it was full!

[Jasen 10]

She said, it turned over slow. She thought the battery was weak. So she hooked up the charger, turned it on high, started cranking, and SNAP! That was it!

[Geno 1,929]

And there folks is the LOL for the day!       

[Wheel-N-It 2,971]

Part of me thinks the oil technology is so advanced now its not necessary to run wot all the time, but I still like to do it to hear those flathead Kohlers produce power

[JC 1965 1,532]

Could you give me more info on how you up sized the pto pulley ? What size did you up size to ? I assume you had to go to a longer belt, if so what size ? Any info you can give me would be appreciated. I would like to do this also if it isn't to complicated. Thanks !![/quote

I don't have any pictures with me now, but if you search for my thread on my 74 c-160 restore, there are a few pictures and a description. I've been using an original belt but the mule drive is pretty tight to the axle. So far it hasn't caused any problems but when it's replaced I'll get one a bit longer.

 

Here is the link to my earlier thread on the upgrades I did to my 160

 

PM Sent !!

[Geno 1,929]

Part of me thinks the oil technology is so advanced now its not necessary to run wot all the time, but I still like to do it to hear those flathead Kohlers produce power

 

There's something new, oil technology has come a very long way.  No, let's not talk about oil. 

[Molon_Labe 731]

There's something new, oil technology has come a very long way.  No, let's not talk about oil. 

 

Don't we all use 30 wt. non-detergent?

[Jasen 10]

I use 80-90w from the dollar store. It was on sale for $.99 a quart! Just kiddin.

[Geno 1,929]

 

[km3h 543]

I go to the local service station and steal the oil out of their recovery tank. I like the black color and it is thicker than the new stuff. Same with the oil filters. They come with oil already in them so I don't need to put so much in. And it is multi viscosity too.

[Geno 1,929]

I have about 300+ gallons of used stuff around, you can have all you want.  

[km3h 543]

Do I get free shipping or are you going to deliver when you get around this area picking more Horses?

[Geno 1,929]

Delivery available.  The trailer is always empty on the way there, wherever there is. 

[Jasen 10]

I thought about switching over to vegetable oil. The deep fryer is going to need an oil change soon and I'd hate to see the oil go to waste!