Go Back   The Ford Barn > General Discussion > Early V8 (1932-53)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 02-14-2021, 04:59 AM   #1
Ziggster
Senior Member
 
Join Date: Aug 2018
Location: Ottawa, ON
Posts: 840
Default 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
Attached Images
File Type: jpeg 6FDDFD51-5800-4D14-AB8B-A6DE833C0712.jpeg (139.9 KB, 68 views)
Ziggster is offline   Reply With Quote
Old 02-14-2021, 05:15 AM   #2
Mart
Senior Member
 
Mart's Avatar
 
Join Date: May 2010
Location: Solihull, England.
Posts: 8,732
Default 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.
Mart is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Old 02-14-2021, 06:59 AM   #3
WABOOM
Senior Member
 
WABOOM's Avatar
 
Join Date: Jun 2018
Location: Minnesota
Posts: 347
Default Re: Desaxe engine - Anyone heard about it?

The Mopar slant-6 had offset wrist pins.
WABOOM is offline   Reply With Quote
Old 02-14-2021, 08:54 AM   #4
Ziggster
Senior Member
 
Join Date: Aug 2018
Location: Ottawa, ON
Posts: 840
Default 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
Ziggster is offline   Reply With Quote
Old 02-14-2021, 12:52 PM   #5
GB SISSON
Senior Member
 
GB SISSON's Avatar
 
Join Date: Jan 2014
Location: Orcas Island Washington
Posts: 4,846
Default Re: Desaxe engine - Anyone heard about it?

Quote:
Originally Posted by WABOOM View Post
The Mopar slant-6 had offset wrist pins.

The 'leaning tower of power'.
__________________
Owner/Operator of 'Jailbar Ranch' on the side of Mt. Pickett. Current stable consists of 1946 1/2 ton pickup turned woodie wagon with FH V8, 1947 Tonner Pickup (red) mostly stock with exception of a cummins 6at turbo diesel, 1946 Tonner Pickup (green) with 226 cu in 6 cyl flathead, 1979 Toyota landcruiser wagon, completely encased in 1947 Ford Jailbar sheet metal. Ok, cornbinder rear fenders..... 'Rusty ol' floorboards, hot on their feet' (Alan Jackson)
GB SISSON is offline   Reply With Quote
Old 02-14-2021, 05:42 PM   #6
WABOOM
Senior Member
 
WABOOM's Avatar
 
Join Date: Jun 2018
Location: Minnesota
Posts: 347
Default Re: Desaxe engine - Anyone heard about it?

Sponsored Links (Register now to hide all advertisements)
^ yep!!!
WABOOM is offline   Reply With Quote
Old 02-15-2021, 01:06 AM   #7
40 Deluxe
Senior Member
 
Join Date: May 2010
Location: now Kuna, Idaho
Posts: 3,774
Default Re: Desaxe engine - Anyone heard about it?

Quote:
Originally Posted by WABOOM View Post
The Mopar slant-6 had offset wrist pins.
Most engines of the last 50 years or so do. That's one reason why most pistons have an arrow or notch to denote the forward side of the piston.
40 Deluxe is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 12:40 PM.