I think if you get these motors on a scale ( and their transmissions ) you're going to find they are quite heavy. Much worse though they are very bulky, tall and so very complicated. I think what do is make better mileage possible by being able to run at slow speeds and lower power without the issues of a large displacement engine at high intake manifold vacuum.
These engines have 4 cylinders, but they are nothing like the old 4's in these cars from years ago in terms of size or weight. If anyone wants to get out a tape measure, I think my Ford 302 is smaller than these engines and not much different in weight - maybe lighter with the T5....
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To me the transmission is the car. It's what you have contact with the most and what gives you grief if the ratios or effort is wrong.
There is a lot of truth in what Carguy is saying here. The thing I remember most about driving my formula ford is how much fun it was to shift and how when you were getting it right you really felt you were with the program so to speak. Why is it so hard to get these parts for car transmissions?
Every motorcycle has a dog clutch transmission.
On my FF after the first year I never used the clutch, just the quickest lift possible - you apply pressure to the shifter, the lift happens and it just jumps to the next gear. You can feel the weight come off one tooth and feel the next tooth grab hold. They sell some of these parts for T5's but I think they are set up for drag racing and might not stay in gear in normal use...