Author Topic: 1115 build  (Read 495 times)

38ac

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Re: 1115 build
« Reply #15 on: March 01, 2019, 11:17:31 AM »
You can absolutely throttle the engine back. Under light loadings it will save a bit of fuel but the bigger issue is noise.  A 1115 up against the stops is one obnoxious sob.  My set up runs just under 1800 rpm. The larger ones like the 1115 are equipped with balance shafts and you should keep the RPM above the gear rattle stage.  Also keep in mind that the injection timing is set for factory RPM thus long hours at heavy  loadings and reduced RPM would benefit from retarding  the timing a bit.
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Willw

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Re: 1115 build
« Reply #16 on: March 01, 2019, 01:36:40 PM »
Hello all, can anyone please measure the diameter of the 1115 flywheel?

Has anyone tried driving the gen-head off the engine flywheel rim like we do with the Listeroids?

I am trying to get a rough idea of the size pulley that would be needed for the alternator in order to reduce engine operating RPM.

I don't have a Chinese horizontal yet, but I've been drooling over the 1130's on Alibaba.com and I hope to have two along with some spares by the time my birthday rolls around.

I figure I could reduce the RPM on that monster and still run most anything in the house.

Tanman

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Re: 1115 build
« Reply #17 on: March 02, 2019, 05:27:19 PM »
So I'm still stuck between a 7.5kw and 10kw head, either one would be plenty of power for me. If they are both rated at their respective power at 1800rpm, would it be better to pony up for the 10kw and run it at 1400-1500rpm (with WI and timing adjustment) if my main goal for this build is longevity? Also, here are some pics of the engine fresh out of the crate and mounted to a dolly for working on and moving around.
Hatz 1B40
Chinese 1115
96 Suburban 6.5 turbo

38ac

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Re: 1115 build
« Reply #18 on: March 02, 2019, 06:20:21 PM »
I run a 15KW on mine.  Don't need that many and the engine wouldn't pull it if I did. The extra capacity does two things for you. It helps start motor loads such as water pumps or A/C units and you have more amps available to either 110 volt branch circuit when wired for 220 operation which saves on load management.
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mike90045

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Re: 1115 build
« Reply #19 on: March 02, 2019, 09:15:50 PM »
At some point, windage looses from the huge fan in the 20kw head becomes more of a load then your electrical.   I'd only go up 1 size from your engine
 I've a 6/1 which pairs to a 3Kw, but I went with a 5kw, to be able to manage unbalanced loads a bit better, and not run the windings smoking hot.   If I went to a 7.5kw it would still generate the 3kw my engine can produce, but now I'm running a bigger fan, moving more air, and maybe the engine can only pull 2.7kw
 I'm just pulling number out of the sky here, but the alternator cooling fan is NOT a negligible load, I think 1 step up is enough unless you have a special need.

Tanman

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Re: 1115 build
« Reply #20 on: March 03, 2019, 04:26:48 AM »
Any recommendations on ST head suppliers? Also, 38AC where did you get your pulley for the st side of your 1115 setup?
« Last Edit: March 03, 2019, 04:28:38 AM by Tanman »
Hatz 1B40
Chinese 1115
96 Suburban 6.5 turbo

38ac

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Re: 1115 build
« Reply #21 on: March 03, 2019, 01:05:08 PM »
I purchase bits like that on ebay, seems there is always somebody on there with my needs for give away prices. Figure out what diameter you need and how many grooves, and include QD bushing in your search. Then search for a bushing by type, SD,SH etc, and by your shaft size in MM.
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38ac

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Re: 1115 build
« Reply #22 on: March 03, 2019, 01:11:09 PM »
Mike , you may be right a out the fan but my gut tells me different.  The fan on my st15 is it only 2" larger than my st5. I suspect that the power requirement at 1800 RPM is fractional. Again, nothing but my intuition with no facts to back it up.
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