Some questions about Deere engines

[RollingsFarms]

I was curious why Deere uses a 5cyl in there 5065m and 5075m(formerly the 5225/5325). As far as I can tell theese are the only tractors that Deere puts these engines in. The 4cyl is used in the 5085m on up to through the 6D series, and maybe the 6030 premium tractors(not sure though)? Also Deere uses the 4cyl in some skid steers and their backhoe's.

The 5cyl replaced the old 2.9 3cyl that was used in some versions of the 5 series tractors(5200, 5300, 5400, 5210, 5310, 5220, 5320) and is currently being used in the 5E and 5D tractors. I've been told it was for emmisions purposes but if that were true why do they use them in the 5E and 5D series tractors?

The 5cyl just seems like a red headed step child to me. It's always made me wonder what the purpose of using an engine in only 2 models of tractors was. why not just use the 4cyl in all 5M tractors? seems like it would be cheaper to manufacture having to use the same engine in a tractor line.

I've been debating on buying a 5065m or 5075m in the future and just wanted to put this out there to see what others though or if anyone else had this on their mind too.

 

[dgl24087]

The 5 cyl. is also used in the 326, 328, and 332D skid steers.

 

[RollingsFarms]

oh ok, thanks for the info! i had browsed around on Deere's website and found it in some marine applications as well. still makes me wonder why the 4cyl isn't used in favor of the 5 cyl in the 5M series line.

 

[beenthere]

I don't know the specific answer, but I'll bet that JD knows why and its the best bet for the application.

Could be EPA rules, could be size/hp needs, etc.

 

[greasemonkeyok]

Not an engineer and not really responsive, but my experience with a 5 cylinder diesel Peugeot many years ago was positive. Good torque in the straight 5 design.

 

[SSdoxie]

More torque with less HP, better EPA emissions, & less vibration. This is same reasoning Ford used in 1998 when dropped the big 460 V8 is favor of the V10.

 

[AKfish]

I've been lookin' at different tractor models for just over a year. I need a bigger Hp platform to keep up with my hay work.

Like most folk's I have to balance a number of competing issues... existing implements, trailering and storage, machine options and capacities, economy of operation, and finally the price.

So, I started with the upper end of the 4000 machines and moved through the 5000 series up from the D's, E's to the M's.

Couple of things I noticed about the Deere powerplants. The 5-cylinder on the 65M and 75M is the same bore and stroke as the 4024T engine on the 4000 series tractors. Deere strapped another cylinder onto the block and called it good!

The 4.5 liter 4-cylinder engine in the 5085M is turboed but the boost is just 8psi.

Therefore, in order to meet the Tier III and Tier IV standards for emissions and overall efficiency of the 4.5l engine's Hp and torque production it would seem that a non-turbo configuration at the lower Hp levels (65-75) might make it a less suitable powerplant.

AKfish

 

[Zebrafive]

I am thinking it has to be either emmisions or "drivability" for lack of a better word.

Why go to the expense of designing a new engine? Unless the 3 cyl would be over taxed at this power level and the 4 cyl could not meet emmisions or was "doggy" or not fuel efficient at the lower HP level?

 

[AKfish]

I am thinking it has to be either emmisions or "drivability" for lack of a better word.

Why go to the expense of designing a new engine? Unless the 3 cyl would be over taxed at this power level and the 4 cyl could not meet emmisions or was "doggy" or not fuel efficient at the lower HP level?

Well... I think you answered the basis of my position. 75 Hp from the 179 cu. in. powerplant is likely at the upper limit and using it in a heavier chassis (with cab, too) tractor could shorten the "duty-cycle" for that powerplant. That's not a situation that JD wants for their "flagship" optioned tractor that is positioned for heavy duty applications with a long service life.

The 4.5L 4-cylinder powerplant turns out 85Hp while "yawning" with 8-9psi turbo boost. It's understood that turboing an engine also serves to "clean up" the emissions and fuel efficiency as well as increase power output. Dropping the turbo for a naturally aspirated engine for placement in the 65-75Hp range would likely "dirty" the emission's and make the engine fall out of the Tier III-IV rating's.

Check over the stat's here: TTL test reports/JD Deere

Good reading - and note that the 5 cyl. in the 75M is neck and neck with the torque output for the 85M!!

AKfish

 

[Zebrafive]

I see it has 1lb more torque! Turbo boost was 22psi. Wow! I was surprised they did not list boost for my 6415.