125/130 HP Lycoming GPU

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Whitebear
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125/130 HP Lycoming GPU

Postby Whitebear » Tue Feb 23, 2010 3:26 pm

I had a new friend who has been lurking call me today about his engines. He has a couple of Lycoming 125/130? HP GPU engines. One in parts and the other on a boat and running but needing a partial rebuild.

The question is, are parts still available for these engines. I remember seeing some years back and they ran ok for what they were. Does anyone specialize in these engines, parts or rebuilds, or even just factual info?

Is this basically an 0-290 in GPU dress? I have heard the 290 is the V1 version and the GPU is the V2 version, but thats hear say for me.

Any info and contact info would be welcome.

Scotty
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MYDIXIEWRECKED
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Re: 125/130 HP Lycoming GPU

Postby MYDIXIEWRECKED » Tue Feb 23, 2010 4:20 pm

I used to have one way back. I think most of the parts will interchange like the cylinders etc. Not sure of all the internals, but I think they are the same. Cases as you know are different. Mine were cut down to allow for an aircraft flywheel.
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Re: 125/130 HP Lycoming GPU

Postby boobidges » Tue Feb 23, 2010 9:32 pm

they share the same cylinders as the 0-290d(hydraulic lifter engine) and the 0-435(190hp 6cylinder).the gpu is looks the same.but because this is a basicly obsolete series of engines no one makes parts for them.so whats out there is very pricey.like over $200 a hole for rings i was recently told.there might be an automotive crossover but i don't know it.the gpu is commonly converted to hydraulic by drilling the base of the case and tapping it for fittings.then you can bore the holes like a continental gpu to accept bigger jugs(0-320 or 0-480).you can really tie up some money and time in these things.

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Re: 125/130 HP Lycoming GPU

Postby Whitebear » Tue Feb 23, 2010 9:38 pm

SO what are all the Tri-Pacer folks doing about overhauls these days? the o-290 was their stock in trade. Are they in the same bag....... kinda SOL, so to speak? Are they all buying an STC for a different engine? Which ones?

Thanks boobidges
Scotty
"The Constitution is not so the government can restrain the people, it is so the people can restrain the government." Patrick Henry
The government cannot give anything --
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Re: 125/130 HP Lycoming GPU

Postby twister69z » Tue Feb 23, 2010 10:40 pm

Most are going to the 150 / O-320 The rings are being made for the O-290 3 ring pistons , readily available . I machined the crankcases to accept aircraft flywheel and starter.(Must be done when split , or it is a pain in the rear ) Yes the automotive rings work if the pistons are cut for the rings in a ring lathe. 4 7/8 bore Most rings are cast so they work great in chrome applications. The cylinders can be machined for 1/2 valves , or use the 7/16 O-235 L2C valve, Bearings are currently made ,camshafts are no problem to grind, tappets are common,I personally would modify the conn. rods for the higher torque bolts. The crankshaft is another story.. The flange is much thinner than the aircraft counterpart, I have seen many of these crack and break. The repair that works the best is to add a support flange to the crankshaft,It is put behind the flange then the bushings are pulled through the flange.This adds the support to the radius of the flange.The ground power cases can NOT be modified to use hydraulic lifters , the case is a splash oil case to lubricate the lifters.Keeping your valve clearances in spec is very important or the valve will pound the seat into the head. A 1 barrel Holley carburetor with a manual choke is the perfect carb for this engine. I would also install the second magneto in the accy. case.Any other questions ask on this thread.
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Re: 125/130 HP Lycoming GPU

Postby MARMON77 » Sun Feb 28, 2010 8:33 am

Hey Twister, can you give me some contact info. on where to get the rings for the 0290, mine is in need of some. Runs great ,I'm just going through alot of oil. Thanks. Mark

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Re: 125/130 HP Lycoming GPU

Postby pirate » Sun Feb 28, 2010 9:01 am

Hey Twister, can you give me some contact info. on where to get the rings for the 0290, mine is in need of some.


You might try Lew Ingle in Inverness. He's fairly close to you. 352-344-1934
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Re: 125/130 HP Lycoming GPU

Postby twister69z » Sun Feb 28, 2010 9:06 am

402 456 7432 Evenings is best.
If you don't have time to do it right the first time ,
Where are you going to get the time to do it a second time?

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Re: 125/130 HP Lycoming GPU

Postby cleaningoutthegarage » Sat Nov 18, 2017 11:42 am

I have a Lycoming 0290 Crankshaft GPU - How much do they sell for?
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