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Author Topic: Power units???  (Read 1271 times)

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Offline NC Logger

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Power units???
« on: May 09, 2021, 11:07:36 PM »
Looking for advice on which power unit would better serve my needs? I'm looking to replace a 6 cylinder gas engine with either a 4-53 detroit or a 4-71, I prefer detroit simply because I have alot of experience with them. The unit will be pulling a 00 frick mill, just wondering if the 53 would do the job or should I just buy the 71 for the extra power?

Online nativewolf

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Re: Power units???
« Reply #1 on: May 10, 2021, 07:07:55 AM »
@moodnacreek another circle miller!
Liking Walnut

Online moodnacreek

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Re: Power units???
« Reply #2 on: May 10, 2021, 07:54:24 AM »
4-53's are loud and fast. Getting the mandrel speed down will require a small driver on the power unit and a larger than normal on the mill. A 3 or 4 71 would be much nicer as it will not have to scream or need a 36" shive on the mill.

Offline longtime lurker

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Re: Power units???
« Reply #3 on: May 10, 2021, 08:35:37 AM »
4-53's are loud and fast. Getting the mandrel speed down will require a small driver on the power unit and a larger than normal on the mill. A 3 or 4 71 would be much nicer as it will not have to scream or need a 36" shive on the mill.
^^^ what he said.
4-71's have a better selection of injectors available for industrial applications too. You'll be able to dial it right into the sweet spot between RPMs, torque and horsepower so it's loaded up at rim speed on your saw. N65's are just a default setting.
The quickest way to make a million dollars with a sawmill is to start with two million.

Offline NC Logger

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Re: Power units???
« Reply #4 on: May 10, 2021, 02:52:54 PM »
Good to know, 4-71 are fairly common around here.

Offline Osterman.r

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Re: Power units???
« Reply #5 on: September 19, 2021, 11:06:15 PM »
Lurker, what do you mean when you say ďn65ís are just a default settingĒ? Iím interested in using a 471 to run my lane mill.

Online moodnacreek

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Re: Power units???
« Reply #6 on: September 20, 2021, 08:40:18 AM »
The Lurker is talking about doing it right, that is fine tuning the fuel for the speed the engine has to pull the load at.  But don't let this stop you, the 4-71 is a good sawmill power unit.

Offline grabber green

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Re: Power units???
« Reply #7 on: September 21, 2021, 01:26:31 PM »
If you like detroits just get yourself a 6-71 for a power unit and don't look back. If 3 phase is available forget diesel and go electric.

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Re: Power units???
« Reply #8 on: September 21, 2021, 09:54:48 PM »
If you like detroits just get yourself a 6-71 for a power unit and don't look back. If 3 phase is available forget diesel and go electric.
Yes, that's right but alot of guys for alot of years do fine with the 4 and after all you have to pay for the fuel.

Offline Osterman.r

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Re: Power units???
« Reply #9 on: September 21, 2021, 10:22:03 PM »
Thank you mood, going to look at and most likely purchase a 4-71 next week. The cat d4400 is under powered to start with and really tired. From what Iíve seen and read, the 4-71 is reliable and plenty of power.

Offline grabber green

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Re: Power units???
« Reply #10 on: September 22, 2021, 06:11:49 AM »
4-71s work for sure ,I sawed with one for quiet a while and still have two of them for spares. A lot of other ways to power a mill work just fine to. But I sure like the extra power of my 6-71 that is hooked to my 0 frick . Didn't really notice that big of difference in fuel consumption. 

Offline jpassardi

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Re: Power units???
« Reply #11 on: September 22, 2021, 07:57:45 AM »
My excavator has a 471 and it runs flawless, starts very easy, oil stays very clean, no smoke.

Downside: Loud and not bashful on fuel. This and emissions are what killed the 2 stroke diesel.
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Online moodnacreek

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Re: Power units???
« Reply #12 on: September 22, 2021, 08:59:05 AM »
The complaint on the old 2 stroke [ jimmy's, Detroit's, screaming green's or Yamaha's ] is that rebuilds don't last and that seems very true. Probably not an issue unless you run full time production. They sure start good.

Offline grabber green

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Re: Power units???
« Reply #13 on: September 22, 2021, 09:38:38 AM »
Never heard that detroit rebuilds don't last. I've built a bunch of them over the years and never had a problem. Maybe those guys don't understand that just because they leak and burn oil it doesn't (most of the time) mean theres a problem . :)  If  you like clean ,quiet and pretty engines ,stay away from older detroits . If you like simple ,tough  ,loud and easy to work on ,53 and 71 series detroits are great.

Offline Osterman.r

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Re: Power units???
« Reply #14 on: September 25, 2021, 07:16:50 AM »
Success in picking up the Detroit last night. It has two stuck injectors, should have them freed up this afternoon.
 

 

 

Offline Osterman.r

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Re: Power units???
« Reply #15 on: September 27, 2021, 10:40:57 AM »
Itís a runner. Had two stuck injectors and a mud wasp nest in the blower. 

Offline handhewn

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Re: Power units???
« Reply #16 on: September 27, 2021, 11:15:30 AM »
I've got the 6-71 in my circle mill. I could not be happier with this engine.

Online moodnacreek

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Re: Power units???
« Reply #17 on: September 28, 2021, 08:13:31 PM »
Success in picking up the Detroit last night. It has two stuck injectors, should have them freed up this afternoon.(Image hidden from quote, click to view.)
 
(Image hidden from quote, click to view.)
 
(Image hidden from quote, click to view.)

That should have an honest 100+ h.p.  Good for you.


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