"Keen "to replace V6 with inline Gas engines

ROBERTSUNRUS wrote:

Golden_HVAC wrote:
I think that the Ecoboost will stay V6 and not go inline.

Ford is making a inline 3 and 4 Ecoboost, and we keep hoping they will make a 302 V8 Ecoboost. This would make a great engine for the F-250/350 trucks in the 5 ton to 7 ton GVWR class.

The "Problem" with V6 is they only have 4 main bearings. Inline 6 has 7 main bearings, and thus can be smoother running.

When GM decided to make the 4.3L V8 using a 350" 90 degree block, but only 6 cylinders long, it would run rough. This is because it was still 90 degrees between the cylinders. When they changed to a 60 degree V6, then it ran smooth, because it would fire every 120 degrees, not 90, 180, 90, 90, 180, 90,

The inline 3 cylinder 1L Ecoboost is proving especially popular. Making about 100 HP, it is used in a wide range of European cars, and even a few American cars.

The F-150's are being equipped with both the new 2.7L V6 Ecoboost at about 325 HP, and the 3.5L Ecoboost at 365 HP.

Have fun!

Fred.

:) Hi, the reason the inline six has seven main bearings is because the have one rod between the mains. The V-6 has shared crank throws and has two rods per throw, so only four mains needed/possible. Some early inline sixes were made with only four mains.

90 degree V-6's are odd fire and rough running, but torque'y. Later models were made into even fire by off setting the throws on the crank shaft. This made them like 60 degree V-6's in a 90 degree block.

Quite right. I've found both my 90 degree V6's I have, very torquey. One a Buick 3800, the other a Chevy 4300 have lot's of low and mid range punch. Also the Buick is very smooth and the Chevy became smooth, after initial break in of 2500-3000 miles.

The Buick 3800 is very torque rich for it's displacement. It has surprising acceleration , considering it's a large, older 6 passenger
sedan.