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Old April 25th, 2006, 12:50 PM
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George Kase
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Info on part time 4Cyl from D-90 V8?

Just curious if anyone has researched this possibility for saving fuel where you would "turn off" half the cylinders when you don't need power? I would guess you would need to create your own fuel injection controller (something like Mega Squirt)...anyone thought at all about this?
George
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Old April 25th, 2006, 01:09 PM
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Unfortunately, it's basically going to give you no benefit with the valvetrain design on most engines not designed for that system. Since the valvetrain will still be functioning normally, you will have all of the compression drag in the cylinders that are without fuel. On all the other Displacement On Demand engines out there, they use different methods to force open all of the valves in the cylinders that are shut off, and this eliminates almost all of that drag. The end result will most likely be too little power to even maintain speed, my guess that you would see 50hp or less total output from the engine if you're lucky.

-Hans
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Old April 25th, 2006, 01:11 PM
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Peter Sherman
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Caddy tried that a long time ago didn't work then.
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Old April 25th, 2006, 01:13 PM
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Yep, the 8-6-4 Caddy is considered one of the worst engines ever pawned off on the public.

-Hans
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Old April 25th, 2006, 06:42 PM
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Peter Sherman
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Hans let us not forget the dreaded 350 diesel.she was a gem as well
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Old April 25th, 2006, 08:13 PM
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I was building onto an Oldsmobile dealership the first winter after those 350 diesels came out. Even in the mild Tulsa winters they were hauling in the dead ones as fast as the tow trucks could pick 'em up.

Didn't the 8/6/4 Cadillac come out at the same time?
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Old April 25th, 2006, 09:50 PM
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Never dealt with the 350 Diesels. The 8-6-4 was 1983-1984 I think.

-Hans
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Old April 26th, 2006, 09:05 AM
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While the Olds diesel engines were a huge bust. The blocks are very strong and are sought after for building gas race engines. They're known as DX-350 block in the Oldsmobile community. If you couldn't tell my other car is an Oldsmobile.
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