CK series engine HP differences - tuning only

[Sawworcs]

I talked with a dealer and was told the CK2610 has the same engine block as the old ck35 (100 CI). They told me that the injection pump was detuned by using shims???

 

[RinconVTR]

I talked with a dealer and was told the CK2610 has the same engine block as the old ck35 (100 CI). They told me that the injection pump was detuned by using shims???

I believe its likely something that simple, the problem is confirmation. It would require someone finding the shims and experimenting. And then how do you measure the power difference?

It wont go over well if we get a verbal report of "I gained 10hp by removing a shim!". :irked::muttering::talktothehand:

 

[The Fred]

I believe its likely something that simple, the problem is confirmation. It would require someone finding the shims and experimenting. And then how do you measure the power difference?

It wont go over well if we get a verbal report of "I gained 10hp by removing a shim!". :irked::muttering::talktothehand:

It is a pump screw adjustment plain and simple. Power difference is measured in beers. Before I fixed mine I drank 4 beers mowing my lawn with a 72 inch rear discharge mower. Now I only need 3.

 

[Coyote machine]

It is a pump screw adjustment plain and simple. Power difference is measured in beers. Before I fixed mine I drank 4 beers mowing my lawn with a 72 inch rear discharge mower. Now I only need 3.

Actually the EPA downsized your yard while you reached for the 4th beer.

Why is nothing from the factory good enough for some of you guys? If you wanted more HP why not buy a bigger tractor at the get-go?!:confused2:

 

[Coyote machine]

RinconVTR, I've had the same question/idea for quite some time now also. My TYM T273 has the same engine as the T233 and T293 so I often wondered just "how" does that happen? 23hp from the 233, 27hp from the 273 and 29hp from the 293; all from the exact same engine! Go figure! But, to start blindly messing with fuel pumps, pressures, etc., etc., is very likely to swiftly cause $$ problems! Since I don't have any problem with my machine the way it is, why go messing around is my current thought. However, an honest answer is always appreciated. So I wonder how is this done. Greg

For comparison sake, my Yamaha 4 stroke gas 225 HP outboard comes in 225-300HP with 225 and 250HP also available, in the EXACT same displacement/weight category, IIRC. I wondered how that was possible when I bought my 225HP engine. If I'm not mistaken it is done via fuel injection tweaking in the computer; and believe me a six cylinder Yami 4 stroke is a complicated engine by any comparison to a diesel tractor engine. No slam intended here, just saying if it can be done on the outboard with all it's sensors, etc. up or down tuning a diesel should be a relative cakewalk for most manufacturers.

FWIW, here is a link to a description of how the engines make the various HP upticks through precise fuel metering, like what Fred alluded to in one of his posts.

"Introducing the next generation of Yamaha Offshore outboards.

Yamaha proudly announces the next generation of V6 Offshore four-stroke outboards, the F300, F250 and F225.

Highly evolved and perfectly adapted to the offshore marine environment. With their big bore 4.2 litre displacement, these engines are exceptionally powerful. Their big capacity has been matched with Yamaha’s Variable Camshaft Timing system that dramatically increases power and throttle response at low and mid range RPM. This allows Yamaha’s new 4.2 litre big-bore V6 Offshore Outboards to deliver awesome “out of the hole” performance and mid-range acceleration you have to feel to believe.

Class leading 4.2L capacity has been achieved by using a highly-advanced thermally-applied plasma fusion process on the cylinder walls. This is a feature, more commonly found on high performance sports cars, that makes Yamaha’s new V6 Offshore outboards like no other outboard motor ever made.

They have no conventional steel cylinder sleeves, yet the cylinder walls are 60% harder than steel. Sleeveless cylinders mean larger cylinder bores for increased displacement, resulting in more power and torque. This is all achieved without increasing the overall size of the engine.

It also results in better cooling properties and dramatically lighter weight. Amazing weight savings have been achieved on Yamaha’s new Offshore V6 range for maximum performance without sacrificing durability. In fact these motors are the lightest in their class by quite a margin.

All air entering the engine block of each Yamaha V6 Offshore outboard is routed through a single 75mm electronically-controlled throttle valve. Working in concert with the Precision Multi-Point Fuel Injection System, together they help ensure the precise amount of air and fuel necessary for optimum power and fuel efficiency.

Yamaha V6 Offshore outboards are compatible with Yamaha’s new electronic rigging system. Featuring a new 5” high-contrast, multi-engine, LCD display, new Electronic Controls, and new key switches and start/stop panels, this system offers more convenience, flexibility, and information than ever before."

 

[Gregster613]

Thanks for that information Coyote, That goes along with my original thought - it takes specialized equipment and tinkering to achieve "whatever" max output from an engine. Far, far beyond me. I was just curious as they all seem to be the exact same engine otherwise. I'm happy with mine as is, and believe like you - "If I wanted more power I should have bought a bigger tractor."
Thanks, Greg

 

[RinconVTR]

Why is nothing from the factory good enough for some of you guys? If you wanted more HP why not buy a bigger tractor at the get-go?!:confused2:

Oh come on now. This is human nature and you'll find it in EVERY internet forum for EVERYTHING with anything resembling a motor or engine.

Dont try to tell me that if you found out you could gain 10hp by removing a couple shims or doing what ever simple procedure...you would not attempt it.

 

[JimR]

Oh come on now. This is human nature and you'll find it in EVERY internet forum for EVERYTHING with anything resembling a motor or engine.

Dont try to tell me that if you found out you could gain 10hp by removing a couple shims or doing what ever simple procedure...you would not attempt it.

I just found this post after posting the same question about the NX series motors all having the same displacement, bore and stroke. My thought was a bigger cam and injector nozzle. I know that some Kohler motors us the same block and heads. The cam and carbs are bigger on them to increase horsepower. As for the comment on buying a bigger tractor for more HP, the NX's are all the same from what I read other than HP. They all use the same loaders and have the same lift capacity at the rear. So why not tune your 45HP up to a 60HP if the tune up is cheap enough. The only other thing I didn't check was the cooling capacity of the NX tractors.

 

[Amvcane]

I just found this post.... So why not tune your 45HP up to a 60HP if the tune up is cheap enough.....

I'm not against this if it is needed.
One negative is fuel consumption, some buyers who spend many hours in the field will consider gallons per hour burned at pto speed when purchasing a tractor.
In my case, I use my tractor for hobby gardening and property maintenance. I burned 7 gals. of fuel cleaning up the last snow storm we had in the NE and never ran out of HP. If I increased my hp from 34 to say 50hp, I would not have got the job done any faster. The snowblower has a maximum volume of snow it will move at pto speed and I was at that limit. More hp would only burn more fuel.
Still curious how to increase the hp...if I need it.

 

[JimR]

I'm not against this if it is needed.
One negative is fuel consumption, some buyers who spend many hours in the field will consider gallons per hour burned at pto speed when purchasing a tractor.
In my case, I use my tractor for hobby gardening and property maintenance. I burned 7 gals. of fuel cleaning up the last snow storm we had in the NE and never ran out of HP. If I increased my hp from 34 to say 50hp, I would not have got the job done any faster. The snowblower has a maximum volume of snow it will move at pto speed and I was at that limit. More hp would only burn more fuel.
Still curious how to increase the hp...if I need it.

Wouldn't it be nice to be able to detune and up the HP when needed by just plugging in a laptop.