Speedway’s Valve Train Components

[Tim Ayers]

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.

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.

[flatheadmurre]

Originally Posted by Tim Ayers

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.

You gain HP or rather loose less...
But friction from compression ring will just show running the engine...not turning over by hand.
And what kind of power increase in % do you think it will gain for you ?
Older rings ain´t easier in any way...other way around since you need break-in which means the driver can fail doing it correct...and manufacturer gets a warranty claim.
Question is more where the money is best spent on a street engine.

[Tim Ayers]

Originally Posted by flatheadmurre

You gain HP or rather loose less...
But friction from compression ring will just show running the engine...not turning over by hand.
And what kind of power increase in % do you think it will gain for you ?
Older rings ain´t easier in any way...other way around since you need break-in which means the driver can fail doing it correct...and manufacturer gets a warranty claim.
Question is more where the money is best spent on a street engine.

5% here, 5% there all starts to add up to real numbers. If I'm dumping a ton of money and time into an engine, I want the biggest bang for my buck I can get. Every component was thought out how it will work, as a whole, with the other components.