View Full Version : Air vs. Liquid cooled

02-17-2004, 11:25 AM
Is liquid cooled that much better then air? If so, how much better. I was told that a liquid cooled engine will last twice as long as an air cooled one. Is that true? I am looking at a used liquid cooled Kabota with 1000 hrs on it. Its in great shape and has lots of new parts. This will basically be a back up mower so its not going to get huge hrs put on it. I ask because I am not familular with liquid cooling. Any imput would be great. Tim

02-17-2004, 11:52 AM
What i know vs the both the liquid will last longer becasue the engine is operating at a cooler tempeture. Also i hurd that when its hot out and the engine is hot it doesnt lack power as much?? Sort of like having your hydro pumps running at a cooler temp. Dont forget to keep the radiator screen clean!

02-17-2004, 02:05 PM
Liquid cooling keeps cylinder temperatures more even than air cooling, where the side that is getting airflow will be cool, and the side away from the airflow will be hotter. That means that the engine builders need to have greater tolerances to avoid a seizure when one side is closer to the piston than the other side. Liquid cooling also allows more power out of the same displacement, because it can transfer the additional heat that exploding more air and fuel results in. Liquid cooling does result in a durability gain simply because it can keep the temperature much more constant in a small range. However a very low stressed lawn mower engine is pretty durable anyway, and I wouldn't really worry either way.

I would worry if the engine has lots of new parts on it, and try to find out the reason and who carried out any work.

02-17-2004, 02:17 PM
I had the same debate and went with air cooled....Reason being a lot fewer things to go wrong out in the field....With liquid cooled the following could happen :
Burst hoses, leaking radiator, stuck thermostat, leaky water pump, break a belt to the waterpump....I run nothing but aircooled small equipment with the exception of my Jacobsen F 10 Mower but there wasn't a choice on that and
Possibly the Toro 580 D if I get it.


02-17-2004, 06:18 PM
Originally posted by timsjeep
I was told that a liquid cooled engine will last twice as long as an air cooled one. Is that true?
I know you'll get a few more hours out of the l/c, but twice as much is a bit too much I think. I once ask the same question and got told ± 300 hrs more on a l/c than on the same size a/c.

I also got told that you need to check how your l/c engine is placed or located on the frame. On some of these machines you have drive belts and pulleys directly underneath the radiator. They say when those belts come off the pulleys or break and disintegrate it might cause severe damage to the radiator which can incurr costly repairs. Which made sense to me.

It seems like it is something that can happen but nobody had expierenced that before.

Anybody know anything about this?


02-17-2004, 06:52 PM
liquid cooled will last longer. it was explained pretty good above by sgrprincees. but if you need the durability of a liquid cooled is up to you. a well taken care of a/c will last 3000 hrs more or less depending on alot of variables. l/c will go much longer than that. 4000 hours on a liquid cooled should be easy.

02-19-2004, 03:32 AM
Tims, I personally think the Kabota l/c is one of the best engines ever made. I have 3000 hours on mine and have never touched it. It is very smooth and quiet.

02-19-2004, 11:32 AM
Thanks for all the imput. I decided to go ahead an purchase the mower. Its a Walker MC with a 48" SD deck. The engine has 1055hrs on it but you would never know by looking at the machine. Its the 24.5 hp Kaboda gas L/C engine that really gets me excited. It just sounds good. Anyway, thanks for the help and I will post a few pics when I pick it up. Tim

02-19-2004, 03:05 PM
that kubota is barely broke in man! you'll get good service out of it i'm sure

02-19-2004, 05:28 PM
If you take good care of this engine, you will get tired og it before it breaks.

02-19-2004, 09:20 PM
a kubota engine is great and long as you service it properly you will get many hours out of it

02-20-2004, 12:05 AM
Well, here it is. Its a little dirty because it was snowing when I when I went to pick it up.

02-20-2004, 12:06 AM
And one last picture for ya.

Envy Lawn Service
02-21-2004, 04:34 AM
Once you have had time to try the new to you Walker out, please PM me and let me know what you think of those tires on it. I'm considering a set of those for my Z.