John Deere 3320

[RoyJackson]

Once again Roy has the answer. Turbo on the 3320!!!

No...I just pointed out the engines in the 3320 and 3520 were different. I would not turbo an engine. As long as one is conservative and realistic, probably no harm. It's very tempting to go overboard and damage or reduce the longevity of the engine.
I'm pretty happy with my 27 gross engine HP, 24.5 at the PTO. For my 2.5 acres and a field I mow occasionally, it's plenty. Runs the 5' cutter and 5" rated chipper quite well (no bogging).
I am considering a 4300 or 3320, but that's for the reverser transmission (and more gears).

Spudland Dave is right though...one casting can produce a number of different engines. None of us know if the same casting is used for the 3320 and 3520 (might see a part number cast into the blocks, if anyone wants to look...that would confirm it).
Also, these engines are used in applications other then for tractors. Some of you may see more then one oil filler cap, for example.

 

[dieselalles]

Ditto on what Roy said. When I bought my 3320, I couldn't justify to myself the extra $$$ for a 3520 which has 2 more horsepower. Even the 3720 would be hard for me to justify with only 4 more HP. It's obvious that the turbo on both the 3520 and 3720 is very restricted. Back in my earlier farming days, the difference between turbocharged and non-turbocharged models was around 25-30%. You could definitely tell the 25% difference between a JD 4020 and a JD 4320. I guess I would have to be cutting it pretty close to see what advantage the extra 2 ponies would offer between the 3520 and 3320.

 

[Spudland_Dave]

Ditto on what Roy said. When I bought my 3320, I couldn't justify to myself the extra $$$ for a 3520 which has 2 more horsepower.

Which specs were you looking at? the 3520 has 5hp more...

3320 @ 32.8 engine HP: Product Specification for 3320 Compact Tractor (32.5 hp)

3520 @ 37.1 Engine HP: Product Specification for 3520 Compact Tractor (37.1 hp)

Add to that the 35 & 37 have less displacement and I'd say the turbo isnt so "restricted".....

 

[mfreund]

Easiest way to find out if it's the same engine is to look over the tractors' specs and see if it's the same Yanmar engine. The 3320 engine is the Yanmar 3TNV88, the 3520 is the Yanmar 3TNV84T. The 3320 engine has 100 cubic inch displacement naturally aspirated and the 3520's engine is 91.5 c.i.d. and turboed.
FYI, the 3520 and 3720 do use the same engine.

I was pointing out if you HAD to have more power, there could be a way to add a turbo to the larger displacement engine. Me? i would use it as is.

 

[Nuru]

Ditto on what Roy said. When I bought my 3320, I couldn't justify to myself the extra $$$ for a 3520 which has 2 more horsepower. Even the 3720 would be hard for me to justify with only 4 more HP. It's obvious that the turbo on both the 3520 and 3720 is very restricted. Back in my earlier farming days, the difference between turbocharged and non-turbocharged models was around 25-30%. You could definitely tell the 25% difference between a JD 4020 and a JD 4320. I guess I would have to be cutting it pretty close to see what advantage the extra 2 ponies would offer between the 3520 and 3320.

The extra 5 hp is good for me on hot days when I am mowing up my steep slopes (15 - 25%) with full AC going. I had a 4310 and it would sometimes labor a bit depending on the height of the grass and the size of the mower.
With the Cab, AC, my MMM, I think the 5 HP is definitely useful in preventing the tractor's engine from working too hard. My price delta was not significant at all either. (less than $2k). i was thinking 3720, but the $4k+ I decided to use on future implements.

 

[Nuru]

I was pointing out if you HAD to have more power, there could be a way to add a turbo to the larger displacement engine. Me? i would use it as is.

You can but wouldn't the cost and potential engine damage risk be a bit too much vs. trading up??