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02-14-2021, 04:59 AM | #1 |
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Desaxe engine - Anyone heard about it?
Came across this wiki article about desaxe engines, and they mention Henry Ford used this principle. I recall reading some stuff about the pistons centres being slightly offset with that of the crank (0.14” - according to pic), but from what I can recall, no one had a good reason why. Perhaps this principal explains why it was done so. Seems to becoming back into vogue.
https://en.wikipedia.org/wiki/Desaxe |
02-14-2021, 05:15 AM | #2 |
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Re: Desaxe engine - Anyone heard about it?
OK. I'll have a stab at it.
Imagine the load on the piston wall during the power stroke. The downward push on the piston will generate a sideways thrust on the cylinder wall. Consider, for this discussion the power stroke as a "heavy" load. Now consider the compression stroke. The action of the crank pushing the piston up the bore and compressing the charge also applies a thrust force to the cylinder wall, on the opposite side. Consider this, in comparison to the power stroke to be a "light" load. To reduce the heavier load on the power stroke, reducing the con rod angularity can help. How do you do that? You offset the crank towards the thrust side on the power stroke. You increase the thrust load on the compression stroke but it is still nowhere near the load on the power stroke, but you have balanced them better and reduced friction on the power stroke. Less friction means more power. End of lesson. This is off the top of my head and how I have rationalised it for myself. Mart. |
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02-14-2021, 06:59 AM | #3 |
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Re: Desaxe engine - Anyone heard about it?
The Mopar slant-6 had offset wrist pins.
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02-14-2021, 08:54 AM | #4 |
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Re: Desaxe engine - Anyone heard about it?
After a bit more digging, I came across this old thread. Very detailed explanation on page 3.
https://www.jalopyjournal.com/forum/....457580/page-3 |
02-14-2021, 12:52 PM | #5 |
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Re: Desaxe engine - Anyone heard about it?
The 'leaning tower of power'.
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02-14-2021, 05:42 PM | #6 |
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Re: Desaxe engine - Anyone heard about it?
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02-15-2021, 01:06 AM | #7 |
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Re: Desaxe engine - Anyone heard about it?
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