Re: Re: Re: M piston size and turbo

Posted by Dr.EVIL on October 23, 2003 at 07:35:45 from (12.4.181.2):

In Reply to: Re: Re: M piston size and turbo posted by sod on October 22, 2003 at 22:37:22:

The intake ports are siamesed, meaning they split into two ports inside the head. This is O-K for a naturally asperated engine since the first cylinder starts the air/gas mixture moving into the first cylinder and when the intake valve closes the mixture is already moving and just diverts towards the other cylinder with the open intake valve. Under boost You exaggerate this situation and would have one cylinder getting more mixture than the other, making more power and making tuning a bear! It "MAY WORK" with the OEM firing order, but it would probably work better with it changed. In order to make the turbo fit I'm assuming your throwing the entire intake/exhaust manifold out and fabricating from scratch. I saw a 1939 to 1942 gasoline powered FARMALL M at a Super Stock tractor pull 30 yrs ago in Davenport, IA that was turbo-charged but I never saw the left side of the engine to see how He had it plumbed. He was still running the IHC Magneto. He also had PLENTY of power for the class He was pulling in! I also have a small picture with caption from a farm magazine from 25+ yrs ago about a Farmall H that was turbocharged. Gas engines really don't lend themselves to turbocharging. The pressurized fuel/air charge burns WAY too hot. And most people try to run way too much static compression. A good turbocharged gas engine needs to have 6 or 7 to 1 compression, REAL good gas, Best ignition possible, and then should be able to make 2, maybe 2-1/2 HP per cid. The trick is to run low compression with LOTS of boost. Even diesel engines run this way now.

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