horsepower again???

Hey folks,
i'm real thick headed on this HP thing...
Kinda in the market for a bigger tractor and am confused on the HP....

IHC tractors, 4 tractors (models) have the same motor and transmission but have 34, 35, 40, and 45 HP.

How's that work?

Dave

I'm not an IH man and dont know the specific 4 models you are thinking but JD used a 404 engine from the 4230 to the 4630 which ranged from 100-150 HP. Some had a turbocharger, some a turbo and intercooler, and different fuel injection.

Check the Parts Catalog if you want to know if they used the same parts.

Has to do with RPM's heads pistons timing carbs cams

amen . RPMS, injection Pumps werre only difference with CASE 188 diesel was used in 3 models , cranking out anywhere fron 35in the 430 to 50 +in the 630

It's not that difficult, Dave...really.

Back in the '62-'69 era, Chevy offered the 327 V8 in various horsepower ratings from around 250 all the way to 375 HP. The differences were in the fuel system [2 barrel/4 barrel/fuel injection], compression ratios [via piston domes, cylinder head combustion chamber sizes], valve sizes in the heads, and camshaft profiles [lift/duration].

If you can wrap your mind around what the Chevy V8's were in the various horsepower ratings, envisioning similar variables in tractor engines shouldn't be difficult, either.

I think that part of the HP rating are the marketing plan. If you notice that the 3000 series Deeres have mostly the same motor, the 1.5 Liter 3 cylinder. The 4000 series Deeres mostly have the 2.4 Liter 4 cylinder Deere engine. (but there are several models of each with the same engine) Kinda confusing Huh? Think of it this way, if you have a lot of property like more then 20 acres then get a 50hp machine. The full hydrostatic transmission is priceless IMO. I have a New deere 2000 series, 1 pedal is forward and 1 pedal is reverse. (no gear shifting unless hi to low)

Ford did the same thing with their 6 cyl,401 cu. in. engine. Naturally aspirated, turbocharged, Bigger pump and injectors, then intercooled. Used it in several models.

Same engine, or same DISPLACEMENT? Any engine, diesel or gasoline, can be made to produce almost any horsepower. The tradeoff is longevity and (sometimes) fuel consumption. I once had a 140 HP Evinrude, for which I purchased the factory service manuals. Going through the parts list, I found that EVERY part in the 140 Evinrude is IDENTICAL to the 120, except for the carburetor throttle body. I'm pretty sure the jets were even the same.

Same basic chassis.They may add a couple of extra
clutch disks or use a larger dia axle on the higher
HP versions.
The manufacture will just vary the fuel injection
rate and maybe add a turbo on the larger sizes.
.

Interesting Question . sorry I have no answer, but do these tractors have same height wheel, and drive tires?
(could change ratio to ground)

Could the gears be different inside the transmissions ?

Don"t the German versions have a faster road gear than ours ?

2000 and 3000 Ford gassers had identical 157 ci engines yet one was rated for 33 hp and the other rated 37. They governed the 3000 about 200 rpm faster and maybe changed the jetting in the carbs.

(quoted from post at 16:48:26 07/11/10) Same basic chassis.They may add a couple of extra
clutch disks or use a larger dia axle on the higher
HP versions.
The manufacture will just vary the fuel injection
rate and maybe add a turbo on the larger sizes.
.

Click to expand...

All are the same setup (optic) but the tractors are a little different.
Guess my reason for asking was if everything is the same, could I get the 35HP one and get 45 out of it from an adjustment.

Not a big deal though, tractors are starting to get a little cheaper in that range and smaller ones like mine are getting more expensive. Just have to find a shot to put the wife into hybernation until I can buy/sell and even things out.

Dave

Going by what you've got, and where you want to get to, I'd suspect that upgrading to a larger tractor would be the more practical approach! It seems to me that under 50HP tractors are more in demand, and command a higher price per HP than 50 t0 75HP tractors do! I haven't heard of many that "turn the smoke screw up" on under 100HP tractors, but it seems to be more common on the over 100 HP tractors. From what I've read in your various posts, I would speculate that a tractor with loader in the range of 50 PTO HP would work well for you!
JMHO, HTH, Dave (also)

(quoted from post at 11:06:37 07/12/10)
Going by what you've got, and where you want to get to, I'd suspect that upgrading to a larger tractor would be the more practical approach! It seems to me that under 50HP tractors are more in demand, and command a higher price per HP than 50 t0 75HP tractors do! I haven't heard of many that "turn the smoke screw up" on under 100HP tractors, but it seems to be more common on the over 100 HP tractors. From what I've read in your various posts, I would speculate that a tractor with loader in the range of 50 PTO HP would work well for you!
JMHO, HTH, Dave (also)

Click to expand...

I hate to part with my little tractor but will keep looking. Really hate to get anything bigger because of the fruit trees on the pastures.


Dave

(quoted from post at 14:57:22 07/12/10)
I hate to part with my little tractor but will keep looking. Really hate to get anything bigger because of the fruit trees on the pastures.


Dave

Click to expand...

Well, I see your dilemma! Maybe you could twist the smoke screw a little, but keep in mind that it will probably shorten the life span of the engine, if not the whole tractor!
Again, JMHO, Dave

(quoted from post at 12:14:00 07/12/10)

(quoted from post at 14:57:22 07/12/10)
I hate to part with my little tractor but will keep looking. Really hate to get anything bigger because of the fruit trees on the pastures.


Dave

Click to expand...

Well, I see your dilemma! Maybe you could twist the smoke screw a little, but keep in mind that it will probably shorten the life span of the engine, if not the whole tractor!
Again, JMHO, Dave

Click to expand...

I'm not smart enough to start turning screws :roll: Gonna give mine another shot with the drum mower next week. If it swings it OK, I'll prolly just put a couple hundred into prettying mine up and keep it. Know what I have then.

Dave

You don't say which models you're looking at, but I found this document on the Case-IH site. The Farmall 40, 45, 55 and 60 models all share a 135 cid engine. But their engines are rated at 40, 45, 55 and 60 horsepower respectively. What gives?

First, note that the 55 and 60 have turbocharged engines. So they really don't have the "same" engine as the naturally aspirated versions, even if the engine internals are identical. The turbo'ed engines may have different pistons and camshaft from the NA, you'd have to compare parts lists to know for certain.

Next, note that the 50 and 60 are rated at 2800 rpm, while the 45 is rated at 2600 and the 55 at 2700 rpm. Remember that power is simply the product of torque times rpm, so if you turn an engine faster it makes more horsepower assuming the torque is constant. Again, there may or may not be internal differences in the engines.

The last thing I noted is the PTO horsepower. Taking the 45 versus 50 as examples, the 45 is rated at 35 PTO hp while the 50 is rated at 40. So either the gearing is different for the PTO (which would make the 50 turn faster engine rpm at 550 PTO rpm), or the 50 is putting out more torque at the same rpm as the 45.

Which to buy? Unless you have an application (such as plowing) where horsepower is important, buying a less powerful tractor is probably the way to go. You're getting the "same" tractor for less money.
Farmall Compact Tractor Specs