Quote:
Originally Posted by Ecky
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?
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yeah, there is kind of two conversations going on at once here.
there is bore to stroke ratio. perception has always been longer stroke means more power at lower rpm, bigger bore means you can fit bigger valves for higher RPM horsepower.
Also, there is stroke to rod length. after doing a bunch of reading, smokey yunich used to believe longer rods are "free" power, but more modern theory is there is a perfect ratio. too long of a rod can lead to issues also, but too short of a rod really sucks.
it seems to me retarding the exhaust timing leads to better bottom end power and better gas mileage.