View Single Post
Old 01-22-2012, 08:21 PM   #21 (permalink)
Ecky
Master EcoModder
 
Ecky's Avatar
 
Join Date: Dec 2011
Location: New Zealand
Posts: 5,019

ND Miata - '15 Mazda MX-5 Special Package
90 day: 40.51 mpg (US)
Thanks: 2,873
Thanked 2,515 Times in 1,555 Posts
Quote:
Originally Posted by Old Mechanic View Post
Always a trade off in reciprocating engines. Longer rods and longer stroke generally give you more torque at lower RPM, but also increase reciprocating mass which will reduce efficiency.

I think the 225 Chrysler slant 6 had a 3.5 inch bore and a 4.5 inch stroke.

regards
Mech
After some reading, I'm guessing the reason the Slant 6 was a... well, Slant 6, was so they could make it extremely undersquare to develop a lot of torque at low RPM, efficiently, but also have long enough rods that the rod:stroke ratio wasn't too poor (and thus causing excess friction, and bending rods all the time), yet still fit under the hood?

  Reply With Quote