Max RPM's

   / Max RPM's #11  
John Deere use the 404 engine in a lot of different applications, and there were internal differences between the turbo and turbo and inter cooled and naturally aspired, some in the bearing and mounts and other internal structure

but they were taking a 90 hp naturally aspired engine and cranking with turbo and inter cooling to over 165 and have read up 200 hp, in some units

but that is a doubling of the Hp on a given set of cubic inches,

your talking about 3 hp (a cheap lawn mower in power increase), one I do not think you will hurt the engine, and two I really doubt if you will hardly notice the power increase,
about the most you will notice is the ground speed increases do to the extra RPMs,

look up in parts and see if they both use the same injectors or pump, that could be where the difference is,
on my old Rosa master pumps there is a way of adjusting the max rpm on the governor in the pump, but you need to know what your doing,

is the gear ratios the same in both tractors or is there a difference, as if you increase speed you will need more power to pull a given size implement,

(I would say while the warranty is in place I would not mess with it, as it may void the warranty when the warranty period is over, turbo that sucker and blow black smoke to your hearts content, spin the tread off the tires or what ever you want to do, but you mess with now and if some thing happens (any thing they would have cause to not warranty it.)
 
   / Max RPM's #12  
Once again a wealth of information available on this forum. I appreciate and thank everyone for the input. I do have a Grand L4240 HST cab model which I purchased new and now has 1900 trouble free hours on it. I purchased the B 2650 with a couple of reasons, 1. I wanted a backhoe..
2. I wanted a second smaller open station tractor to do some of the lighter duty jobs around the place. the 2650 has fit in just perfectly and taking some of the load off its bigger brother and saving some hours. I have no need to juice it up but I am curious,. as to what the possibilities might be.
As a retired veterinarian I took the oath "if you can do no good, do no harm" and I will apply it to my new B 2650, but it won't stop my curious mind investigating the possibilities. I certainly would not do anything at this time that might affect a warranty issue.
Doc Russell
 
   / Max RPM's #13  
I'd say it depends on who is tweaking the pump that day on the assembly line. Most assy. lines use color coded gauges for pass/fail criteria. If you get something in the green area out the door she goes. Green area has some margin to it so one can be on the low end of the range and another at the high.
 
   / Max RPM's #14  
As long as the valve train doesn't float and allow the valve train pieces smack together . Or worse yet allow a valve to be impacted by a piston. Most engines can rev almost to the float point without damage.
 

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