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Old 04-28-2006, 01:44 PM   #11
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Honda's vtec-e eliminates 4

Honda's vtec-e eliminates 4 of the 8 intake valves on a 16 valve 4 cylinder, I don't see why you couldn't just grind off a few lobes to do this to any other engine. I mean, there would be obvious flow issues and such, *shrug* I'm not smart enough to say at this point.
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Old 04-28-2006, 05:09 PM   #12
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Or you could remove half of

Or you could remove half of the rocker arms. Oh yea, I remember, that was a stupid idea.
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Old 04-29-2006, 02:57 PM   #13
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Re: The consensus seems to be

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Originally Posted by Sludgy
I'm still worried that friction in the deactivated cyclinders would be too great to see fuel economy gain. Piston rings are the biggest source of drag in the engine. What about removing the piston rings in the deactivated cyclinders, but leaving in the rods and pistons?
Actually, this depends on the cylinders sealing well. It turns into an air spring, and with a modern design is pretty efficient. If there are no rings, it will continually force air past the piston, loosing a lot of energy.

I think the cam grinding idea is pretty good. The honda VTEC-e's do have a little lift on the non-working intake to prevent fuel pooling. I bet there are cam profiles that are more efficient even in a working cylinder. For example, the Prius has that special cycle where the exhaust is longer than the intake.

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Old 04-29-2006, 02:59 PM   #14
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It is true that the 4 intake

It is true that the 4 intake valves are not completely shut off, I didn't know that until about a month ago, but it makes complete sense. There are lots of people that do custom cam grinds for everything. It's just a matter of testing it out and see if it works, I guess.
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Old 04-29-2006, 03:44 PM   #15
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Re: The consensus seems to be

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For example, the Prius has that special cycle where the exhaust is longer than the intake.
That would be called the Atkinson Cycle, although some argue that it is more appropriately called the Miller cycle.
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Old 05-10-2006, 06:40 AM   #16
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Eureka! I've been interested

Eureka! I've been interested m interested in building a two cylinder car. Converting an inline four isn't terribly practical because of balance problems. But a boxer engine would work super, since the cylinders fire evenly, and piston inertia tends to cancel.

I found a company that converts VW 4 cylinder engines into 2 cylinder engines for airplane/ultralight usage. I'll wager that if this engine was installed in an old Kharman Ghia, you could get 70-80 mpg.

I wonder if there is one on Ebay.
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Old 05-10-2006, 06:40 AM   #17
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Forgot the

Forgot the link....

http://www.greatplainsas.com/schalfvw.html
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Old 05-11-2006, 06:43 AM   #18
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Re: Forgot the

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Originally Posted by Sludgy
Forgot the link....

http://www.greatplainsas.com/schalfvw.html
That's pretty neat...If you used the full case option, you could probably bolt it in the stock location of anything that takes a VW engne!
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Old 05-11-2006, 02:37 PM   #19
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this was being done over 20 years ago.

check ou the link. - Brad
http://www.motherearthnews.com/library/1979_July_August/Convert_Your_V_8_to_A_V_4

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