Any way to increase power cheaply, D155?

cam.man67 · May 8, 2017

The 385 I use for my hay mowing tractor is not a bad little machine, but for years I have gripes about how gutless it is on some of our hills. I ca t really find any info online about power mods for the D155 motor, was wondering if yall had any advice? Perhaps all it is is turning up the pump a bit?

MJ in the UK · May 8, 2017

The D155 is a short stroke engine. If you were this side of the pond I would be looking for a D179 long stroke version as the D179 engine in a 454 tractor was rated here in the UK at 52 horsepower. That is the only way you are going to get more horsepower. MJ

ih560 · May 8, 2017

You could turbocharge it and gain a decent amount of power.

BarnyardEngineering · May 8, 2017

(quoted from post at 05:29:40 05/08/17)
You could turbocharge it and gain a decent amount of power.

He asked about "cheaply." Neither a turbo nor a complete engine swap is a "cheap" solution, let alone an easy solution.

It's not a good idea to go mucking around with the screws inside your injector pump if:

A. you don't know what you're doing.
B. you don't have the proper tools and test equipment (i.e. a dyno) to make sure you did it right.

Just twisting screws can be expensive. It would be cheaper to just get a bigger tractor.

ih560 · May 8, 2017

A turbo is very cheap if you know how to do anything yourself and you don't have to pay someone to fab something or buy a kit. I could turbocharge that tractor for less than $500 including the cost of the turbocharger. I guess Cheap is relative though.

High Octane · May 8, 2017

Rering it, make sure the valve seats
are not ground under dropping psi
off. Two big issues that are common.

David G · May 8, 2017

If it puts out black smoke when pulling, then turning up fuel will do little/no good.

Poor cold starting could indicate low compression.

Blah sound, or excessive smoking could indicate slow timing.

Post more information.

ss55 · May 8, 2017

If the tractor is in good condition, you can probably trade it in on a larger tractor for less cost that modifying your present tractor.

kub6040 · May 8, 2017

I would put 1/2 gas into the fuel it will raise power cheaply, anything else will cost money.

the tractor vet · May 8, 2017

About all ya can due is do a tune up , like resetting valves check pump timing and advance on the pump make sure the air cleaner is clean and maybe a sight fuel increase , but keep in mind that when you start down the dark path of turning up the pump you create more heat and increase engine ware and shorten engine life . Your Little tractor can only do somuch . It comes down to you need a bigger tractor . Heck we need a bigger tractor also .

Any way to increase power cheaply, D155?

cam.man67

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MJ in the UK

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ih560

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BarnyardEngineering

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ih560

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High Octane

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David G

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ss55

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kub6040

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the tractor vet

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