Increasing Horsepower?

[Westonium]

I overclock and mod my PCs.
I tune and mod my cars (all of them).
And now I have a JD 4310 with a Yanmar engine and I'd like to consider reasonable ways to increase the output, say up to 20% higher than rated.

Somebody SOMEWHERE has to have tried this. Anyone?

 

[normde2001]

You might try boosting the ignition /forums/images/graemlins/wink.gif. I have a suspicion those Yanmar engineers knew what they were doing when they designed it.

 

[larso1]

It might be as simple as larger (flow rate) fuel injectors. I understand the only difference between my Iseki TS1610 (19-20 motor HP) and the Iseki TS1910 (22-23 HP) is the size (flow rate) of the injectors. That's close to a 20% difference. I would think the fuel inj. pump would be large enough since it already by-passes some of the fuel back to the tank.

Bill in CO

 

[thegreatrandini]

Just redline it. Then when she blows u can rebuild her anyway u want......Just kiddin ya. I think at a given RPM your going to get the same HP unless you rebuild your engine and change some ratios. You can increase fuel flow but that would only increase RPM's......Bore it out get bigger pistons, change your crank, cam etc.... And you get more HP.
Kioti uses a turbo charger. I have not looked into how that gives them 20% more HP....
Keep in mind that the rest of your tractor is designed for a given HP. You could overload your PTO or Transmision. Snap!!!!

 

[oliver28472]

For most Ag tractors farmers have historically just had the injection pump turned up. If there is a pump rebuilder close by they maybe could do that for you. There are some risks. Too much will probably burn a piston. Just curious but is your tractor weak on power? Most compacts lose traction first. If your tractor is under warranty just don't do it.

 

[Soundguy]

I've also heard that some shibaru engines have governor and fuel injector settings a tad higher on units that have only a couple/few hp differences.

Soundguy

 

[Westonium]

</font><font color="blue" class="small">( For most Ag tractors farmers have historically just had the injection pump turned up. If there is a pump rebuilder close by they maybe could do that for you. There are some risks. Too much will probably burn a piston. Just curious but is your tractor weak on power? Most compacts lose traction first. If your tractor is under warranty just don't do it. )</font>

You present a good argument for not doing it... but I'll still consider it.

For Example:
You'd think that those brains at Chevy knew what they were doing, but I can give any stock C5 corvette about 12HP at the wheels using a leatherman and 2 big zip ties (taking one side of the air box off). The intake inlet is way too restrictive. Now, that simple mod isn't 20%, but it is certainly noticeable.

The tractor certainly seems to lack power when cold. It takes a good while for it to build when it is cold outside - and that to me seems odd. Cars usually have excellent HP cold - the air is denser, etc.

Maybe it is more TORQUE that I am looking for.

I do need more traction, but I am already working on that. Specifically, I need chains for dealing with these hills on occasion, and might need fluid fill in the rears.

I wonder if anyone has used this same engine in a turbo-diesel application? Are there turbo-diesel Yanmars?

 

[chriswheeler]

Yes, some have turbos, but only a few of the larger ones.
Chris

 

[blackd]

Most diesel hotrodders start with adding fuel or lengthening the duration of the injectors pulse (usually to add fuel and timing.) Adding fuel increases HP & torque until it begins to have breathing problems. So the next step is to make it breath better. Higher flowing filter box and exhaust. This is 2nd hand info from hanging around the dieselstop (Ford) forum.

Warning, messing with diesel fuel/timing can cause increases in the Exhaust Gas Temperatures (EGTs.) High EGTs can burn valves, and on turbocharged engines eat turbin vanes. Diesels under load run hotter than gas engines at the exhaust valves. (I think!)

Another warning! Dieels can runaway and explode. They don't have spark or throttles to shut off. If they are getting air and fuel they will continue to run. Horror stories of diesels with leaking crankcase fumes getting into the intake with no way to limit. As the RPMs increased it spewed more fumes until BOOM.

 

[lens12]

The injection pump shop I use said they had some JD Yanmar injector pumps come in that the power module in the pumps wasn't up to specs. You might want to have a shop check yours.
Turning the fuel volumn up at the injector pump & torbo charging are the most common ways of increasing hp on diesel tractors. When these things are done it is even more important not to lug the engine. Lugging leads to higher exhaust temperatures & can lead to melted pistons. When we added a turbo to a tractor we installed a Pyrometer that measures exhaust temperatures. Older tractors transmissions & rear ends were over designed & could handle the extra hp. The newer tractors' transmissions & rear ends are designed more closely to the hp of the engine. I don't know how much extra hp they can handle

 

[oliver28472]

Gear or Hydro? I remember my uncle bought a JD new, let's say 15 years ago. It was an ag tractor with a JD engine, not a CUT. The next size up had an engine that was identical in every respect except for the fuel pump setting. He had it turned up to match the bigger tractor and never had any problem with it. So I'm not saying it's a big no-no, just don't over-do it.

 

[Villengineer]

Diesels, in general, have less power when they are cold. Remember that diesels are compression fired, not spark fired. The diesel and air "light-off" better when they are warm. Diesels rely on outside temp, the temp of the block, and sometimes glow plugs to warm the mix enough to fire. That's also why diesels use block heaters. I know a lot of diesels won't even start if they are cold enough. Ask any first time diesel pick-up truck owner on real cold morning who didn't know better and didn't read the manual. Gas engines' ignition systems provide an ultra hot source of ignition to fire off the mix and therefore, if their spark is hot enough, they can take advantage of the denser mix.
Oh yeah, adding fuel does add power, not just increase rpm. There is a limit of course as the fuel air ratio gets out of whack.

 

[thegreatrandini]

Yes, u could change your fuel to air mixture and burn a little hotter adding hp without increasing RPM. I guess that is how turbo chargers work. I think they blow more air in allowing fuel to burn easier and hotter? I stilll think if you want more hp you should buy a bigger tractor!!!!!

 

[blackd]

Awwww come on Great, what's the fun in buying bigger when you can risk trashingg what U already own and still have fun doing it?

 

[thegreatrandini]

My brother in law the farmer told me when I bought my Yanmar that "farmin is fun........for about 15 minutes". He was right. I only make modifacations that help with the work. Over powering a machine won't help me. I run a 6ft tiller(very gingerly) with a 26 hp tractor. It is too big for my tractor. If I beefed up the hp it would be a disaster waiting to happen......Makes more sense to modify the tiller or trade for a smaller one.....I really need a bigger heavier tractor with more hp to get the most out of a tiller that big.........

 

[YanmarFever]

Randy
If you want a smaller tiller the one you have is fine.
Just remove some of the teeth from the sides and it will be smaller ! just make it what ever size you want (poor mans adjustable tiller) /forums/images/graemlins/grin.gif
Ernie

 

[YanmarFever]

I agree with Randy
If it was me I would trade up to a bigger tractor. Why take chances & blow the engine . The $$ spent trying to rebuild it would buy a bigger one on a trade in.
just my o2
Ernie

 

[thegreatrandini]

I have been told that before but I have not tried it yet.. So far I have only tilled the wife small garden.. Takes 5 minutes.
I plan to really try it out grinding her up an arena. I may remove a couple sets of blades then....

 

[jltrent]

I have a JD5210 which is factory 45 pto hp. I had the fuel pump recalubrated up 10% at a diesel shop and it dynoed 53 hp after. This did help the tractor a lot, but it still didn't make it a powerhouse. When you have the fuel flow upped 10% you usually get more than a 10% gain in hp. I have about 1200 hard hours on it since and other than smoking a little more I don't believe it hurt it any.

 

[ChuckT]

When I was in High School (way too many years back) a diesel mechanic told me that the cheap way to up hp was to fit a new set of sleeves & pistons and since the sleeves are made from seamless tubing any shop could make them up.

I suggested this on another forum & nearly got my head bit-off (for impertinence?)

If I had the time & need to do it that's where I'd start.

Oh, by the way, I'm talking about 0.040 over size here NOT 1/2".

cvt