GM powered Generator

pat sublett · Jun 5, 2017

I have a new 30KW generator with a 4 cylinder GM industrial engine. It is set up for Natural gas. Of course it has all the EPA crap on it and is certified for natural gas only. It has an ECM on it that controlls the timing and fuel mix. Any advise on converting to run on LP vapor?

Phil9N3667 · Jun 5, 2017

Know any HVAC technicians worth their salt? Main thing on smaller 'carbureted' engines was changing an orifice, prolly different here. You can go online, probly find someone who's done the same thing.

David G · Jun 5, 2017

Is it injection or carburetor?

Billy Shafer · Jun 5, 2017

Give me the model and serial number. Who made it. I can find out more information.On the old systems of that size. You flipped the regulator over and removed the pressure spring.Then made the fuel adjustment. I would think it would be the same on the new units.

Billy Shafer · Jun 5, 2017

NG/LP units don't use a carb or injectors. They use what is called a mixer.

pat sublett · Jun 5, 2017

 Vortec 3.0L Specification Focus
Type: 3.0L I4
Displacement: 181 cid (2966.59 cc)
Engine Orientation: Longitudinal
Compression Ratio: 10.5:1 (LW6), 9.2:1 (LMX, High CR)
8.3:1 (LMX, Low CR)
Valve Configuration: Pushrod Actuated Overhead Valves
(2 valves per cylinder)
Assembly Site: Toluca, Mexico
Valve Lifters: Hydraulic Flat Tappet
Firing Order: 1 - 3 - 4 - 2
Bore x Stroke: 101.60 x 91.44 mm
Bore Center: 112.26 mm
Bore Area: 324.29 cm?
Fuel System: MPFI Capable (LMX)
N/A (LW6)
Fuel Type: LMX: Gasoline (MPFI Capable)
LW6: Propane, Natural Gas
Horsepower:
94 hp (70 kW) @ 3200 rpm (MPFI: Gasoline (LMX))
Low CR
93 hp (69 kW) @ 3.0L rpm (MPFI: Gasoline (LMX))
High CR
73 hp (54 kW) @ 2200 rpm (Natural Gas: (LW6))
64 hp (48 kW) @ 1800 rpm (Propane: (LW6

JD Dave · Jun 5, 2017

You will probably need a conversion kit. That's what you do with Kohlers if you want to switch from natural to LP or vice-versa. Talk to the parts guy at the dealer.

Ted in NE-OH · Jun 5, 2017

Talk to your LP dealer they may do it for free as they want your business.

pat sublett · Jun 5, 2017

The regulator that came on it is a feedback type with vacium lines going to the mixer, out-put was 3.5 in water colmn. I put a high volume regulator between the existing regulator and mixer, turned it over and removed the spring with a resulting -.5 WC. It starts quick & runs smooth but I get a rich fuel code on the ecm readout. I have not been able to try it load yet.

Billy Shafer · Jun 5, 2017

Engine shows it can run on propane. Need to know who made the generator. So I can look up the control system

pat sublett · Jun 6, 2017

Central Maine Diesel

Billy Shafer · Jun 7, 2017

I sent in a request for information on ECM specs. Nothing back yet. Did some checking on the company. Results were not good. I will let you know what I find out.

GM powered Generator

pat sublett

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Phil9N3667

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David G

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Billy Shafer

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Billy Shafer

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pat sublett

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JD Dave

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Ted in NE-OH

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pat sublett

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Billy Shafer

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pat sublett

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Billy Shafer

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