Quote:
Originally Posted by flatheadmurre
I´m not sure that many understand what low tension actually means...the only rings that has a tension spec is the oilrings...
Compression ring (first ring only) is forced against cylinderwall by compression and not by a set tension in it...
So if you go modern low tension you have to adress windage or oilcontrol will be the next issue in your new motor.
And if you go real narrow you need tight piston to ring fit...which means you need gasporting for the rings to work...
If resistance turning the engine over by hand would be reflected in horsepower gain it would be lovely...sadly that isn´t happening.
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I hear what you are saying, but drag is drag, no? If it takes 55 lbs to turn over one motor and 40 lbs another, you really don't think that extra 15 lbs. accounts for HP loss or inefficiencies?
Also, if modern rings weren't superior to cast iron, every major auto manufacture would have stuck with them for they are cheaper and easier to install.