Quote:
Originally Posted by Henry Schmidt
70.4x100 is a cool high revving oversquare engine. They are commonly found in the likes of Formula 1 cars, two-stroke racing engines and anything else where you want to rev the engine up to produce power. They keep piston speed down which helps reliability by putting less force into things like your crankshaft and connecting rods. In general, these engines will produce more horsepower than torque and require gearing to take advantage of their top end pull.
We built a 66x100 engine a few years back that saw rpm close to 9000.
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I wili NOT make a 66X100 raceengine!
But yes, I love an engine that revs free and fast! And, even though it sounds weird, I like that it does't have too much torque (TOO much)
This is simply because I like to use the engine fully, without it going at ridiculous speed.... And although I would like to use it on a trackday once in a while, I am NOT a race driver! And it's going to run mostly on the street! Does that make sense?
Something completely different, I have set myself a goal with this engine, which goes directly against what I am in the process of building. For this time I will fight hard to get the engine to go as far on the liter as possible!
This might sound weird, but I simply can't help it! and tune over the top ... It's my core hobby, and my cars always get too wild for the street. (my hair is starting to turn gray)
and in my eyes, tuning for better fuel economy is also a kind of tuning ...
I have already bought a WebCam 21/21 for my project, but now my engine is getting too big and rev-depending for it, I think ... Sigh
But am I to use a cam with bigger overlap, then I will have serious problems reaching my goal...
