16 more HP from the same size engine?

[wolc123]

I can hear the turbo plain as day on my 4120 and so can anyone else who knows what one sounds like. I like the sound. My nieghbor has a 4720 and it's sound is virtually identical. I have never listened to a 4320 or 4520 but I cant imagine them sounding any different. You can really hear it wind up when you pump the foot throttle. One thing that is distinctive on these engines is that they are significantly louder at idle than comparable hp naturally aspirated Yanmars used on smaller series, but not much if any louder at PTO rpm where most work is actually done.

 

[RollingsFarms]

I can hear the turbo plain as day on my 4120 and so can anyone else who knows what one sounds like. I like the sound. My nieghbor has a 4720 and it's sound is virtually identical. I have never listened to a 4320 or 4520 but I cant imagine them sounding any different. You can really hear it wind up when you pump the foot throttle. One thing that is distinctive on these engines is that they are significantly louder at idle than comparable hp naturally aspirated Yanmars used on smaller series, but not much if any louder at PTO rpm where most work is actually done.

i know how they sound, i guess that's why i'm wondering why i'm not hearing mine. i can hear them plain as day on larger tractors(100hp +). even at idle you can hear them. i've listened to all 4020 series tractors, both in person, and videos on youtube and can't hear it at all. i've heard the turbo on 5025(now the 5M series) pretty good, although not as noticible as on those 100+ hp tractors i mentioned earlier. even tractors comparable in size to mine (kubota M5040/6040 for example) isn't noticible.

 

[usmc5595]

i know how they sound, i guess that's why i'm wondering why i'm not hearing mine. i can hear them plain as day on larger tractors(100hp +). even at idle you can hear them. i've listened to all 4020 series tractors, both in person, and videos on youtube and can't hear it at all. i've heard the turbo on 5025(now the 5M series) pretty good, although not as noticible as on those 100+ hp tractors i mentioned earlier. even tractors comparable in size to mine (kubota M5040/6040 for example) isn't noticible.

I have a 5103 and do not hear mine either. I also have a 5.9 cummins turbo diesel, I definitely hear it. However cummins/dodge goes to great lengths to make it not hearable. Maybe that is what happens w/ JD. My cummins had baffles and air veins inside the air tubs to make it quiet, but it also restricts flow and power.

I am gong to check mine out, I don't want to turn the pumps up or change injectors but it would be nice to free up some HP and left it run better and be even more fuel efficient. Any ideas on how to do that?

 

[RollingsFarms]

I have a 5103 and do not hear mine either. I also have a 5.9 cummins turbo diesel, I definitely hear it. However cummins/dodge goes to great lengths to make it not hearable. Maybe that is what happens w/ JD. My cummins had baffles and air veins inside the air tubs to make it quiet, but it also restricts flow and power.

I am gong to check mine out, I don't want to turn the pumps up or change injectors but it would be nice to free up some HP and left it run better and be even more fuel efficient. Any ideas on how to do that?

i didn't know that about the 5.9. i usually hear the turbo very well on diesel pickups, even the new ones that are supposed to be so quiet.

 

[Reg]

Same engine block (base casting) does not equate to "Same Engine".

There was and still is a VAST difference between the various incarnations of the Chev 350 "small block".

LOTS of alternatives with heads, cams, carburation, ignition, fuel injection (& programming/mapping), exhausts, turbos, etc.

 

[SpudHauler]

Take it to the extreme. Drag racers take an everyday 350 chevy engine producing around 250 hp and turn them into 1000 hp giant killers.

But: They rebuild them every weekend.

As stated earlier, more hp, more wear, more maintenance, more cost, less hrs between rebuilds.

Find the happy medium and you have a winner!

 

[MBDiagMan]

The dynamics of a diesel engine are quite different than a gas engine. A gas engine draws air AND fuel into the cylinders while a diesel only draws air and then at the critical moment, fuel is injected. You can make more power in most ANY diesel by injecting MORE fuel. The trick is that the more fuel you inject, the more air must be drawn in for proper stoichiometrics(proper flame and combustion temperature.)

In the old days (of which I am plenty old enough to have experience with) the truckers would have people "turn up" their engines which basically meant more fuel injected. This made lots more power but caused EXTREMELY accelerated engine wear. This was done in a black market sort of way because the truck didn't belong to the driver, but the driver got paid by the mile.

SO, with the same size engine, the turbo boost can be increased with a proper proportional increase of fuel being injected without causing excessive combustion chamber heat. It will put more stress on the bottom end of the engine, but when done by the factory, their testing will indicate how much the bottom end can take without undue stress.

 

[om21braz]

Back to the original question regarding the Deere engines, if my memory serves me correctly, at least some of the difference in power comes from boost. I believe the 4120 should max. out @ 7 psi where the 4720 should go 14psi before opening the wastegate. Others here have previously noted the turbo part# being the same for 4120/4320 and a different part for 4520/4720.

 

[MBDiagMan]

I have lots of diesel engine experience, but not specifically with the engine in question. Depending on the particular injection/turbo system employed on these engines, changing the turbo alone might very well not give you the power increase you expect.

As I tried to explain, increasing the FUEL is what adds the power. To increase fuel delivery without toasting the engine, you also must add the correct amount of air, in this case in the form of boost.

It's also possible that the turbo's might even be the same, but a wastegate is used and that's where the change would be made.

You need someone with very good familiarity with this engine family to give you the EXACT correct information for this modification or you could be asking for at best a disappointment and at worst a toasted engine.

Hope this helps and keep us informed. This is a very interesting subject.

 

[Dargo]

Interesting. I looked up my JD engine, the John Deere PowerTech 4045 engine. In a 5425 that engine puts out 81 engine hp. Move all the way up to the JD 5105 (newer model and model numbers) and it has the same John Deere PowerTech 4045 engine but puts out 105 engine hp. That's 23 more hp from the same engine from the factory. I say "from the factory" because there's all sorts of hp you can get out of a modded diesel which may, or may not, be reliable and durable.

I suppose it sort of makes me feel good that my tractor, a JD 5525, is sort of in the middle and puts out 91 engine hp. Apparently JD feels that the same engine will take at least 14 more hp. Besides, I honestly didn't know how many tractors JD puts their PowerTech 4045 engine in. Maybe it's one of their good workhorse engines? (with fingers crossed). Anyway, with that 4045 engine the factory power output ranges by 23 hp.