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Forum Index : Other Stuff : 6 cylinder engine balance
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| isochronic Guru  Joined: 21/01/2012 Location: AustraliaPosts: 689 |
???? just a thought bubble - If a six cylinder in-line engine has good mechanical balance - will it run on 3 cylinders with the other 3 not firing ? Can they then be used for other things like compressing etc ed - My family had an old Toyota Crown six. The engine was so smooth at idle it was hard to tell if it was running or not, prompting ghastly noises from the starter motor trying an unneeded restart (and even worse from the driver with three-on-the-tree  ) |
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| Boppa Guru Joined: 08/11/2016 Location: AustraliaPosts: 814 |
Not sure about the 6 (yeah those old crown motors were tough as guts werent they, had a 69 crown 6, 3 speed with electric overdrive, it was the limo of the toyota fleet, even had volume and tuning from the back seat!) I know the 2 cylinder conversion has been done many times to vw flat fours, where 2 cylinders run as the motor, and the other two are used as a air compressor, but never seen a six done I spose if you had one running, you could try pulling the appropriate sparkplug leads off and see how it ran??? |
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| George65 Guru Joined: 18/09/2017 Location: AustraliaPosts: 308 |
Kubota and yanmar do a lot of 3 Cyl Diesels. Cant be too bad to balance unless they have inbuilt balance shafts or counterweights in the flywheel. Tell you this much, My listerioid single Cylinder is a jackhammer. Thing is so badly balanced I can't run it unless it is well and truly secured to a concrete slab and even then it tears free after a while. Have to get to pulling the flywheels and balancing it one day.... or just get a better engine and be done with it. |
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| Warpspeed Guru Joined: 09/08/2007 Location: AustraliaPosts: 4406 |
Should work, but you will probably need to keep the original cylinder head for the compressor half of the engine. A much better bet might be a V6 of some description. That would give you much more freedom to adapt a proper "flat" compressor valve plate with reed valves for the compressor half. Cheers, Tony. |
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Gizmo Admin Group  Joined: 05/06/2004 Location: AustraliaPosts: 5078 |
A 4, 6 or 8 can run with a few cylinders down, the resulting vibration will depend on how the missing "bangs" are located in the full sequence. A 4 cylinder with a firing order of 1342 could run happily at 1_4_, or _3_2. At high RPM it will run smooth, but lower rpm will have some vibration. A 6 cylinder would be better, and a V8 would barely have a rough idle. Back in our youth, a mate of mine had a Holden Gemini with the little 1.6L 4 cylinder. It was stuffed, rings gone, and would constantly foul one plug. So he took out the rockers for that cylinder, figured it would save fuel as a 3 cylinder, no point sucking in air/fuel if its not going to fire. It was rough around town, firing miss bang bang bang. On the highway the vibration was ok. A month later a 2nd cylinder needed the same treatment, out came the rockers. His firing order was miss miss bang bang! That was bad, car was shaking itself to pieces, but he drove it like that for another month until he had the money to rebuild it. Glenn The best time to plant a tree was twenty years ago, the second best time is right now. JAQ |
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| isochronic Guru Joined: 21/01/2012 Location: AustraliaPosts: 689 |
There are net descriptions of "linear generators" - so the idea was, put three into the three blank cylinders - conserving the same masses should retain good balance and the whole should be vibration free. Output would be 3phase, I guess 50 Hz at 3000 rpm. Don't know if permanent magnets are ok with constant SHM stress though. (Mainly an idea for an old engine reuse  ) |
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