Max RPM's?????

[POS Dakota]

Originally Posted by thahemp

I always figured the valvetrain would be the first to fail on a street pushrod motor. Kinda neat that it'll keep up with 7000+. It must be lighter than i thought it was.

light is good.

And valvetrain failure is almost always the springs, or the lifter that was mismatched with the spring.

I prefer beehive springs in my engines. They've worked out very well for me. the smaller retainer and less weight of the spring give a lot more valve control. And they don't resonate because the varying coil diameter cancels out resonation.

Every watch something like this?

[thahemp]

Originally Posted by POS Dakota

light is good.

And valvetrain failure is almost always the springs, or the lifter that was mismatched with the spring.

I prefer beehive springs in my engines. They've worked out very well for me. the smaller retainer and less weight of the spring give a lot more valve control. And they don't resonate because the varying coil diameter cancels out resonation.

Every watch something like this?

Yeah. Doesn't GM put beehive springs in stock?

[POS Dakota]

Yep, but they are really marginal. Either way they do the job for the car in factory form.

[thahemp]

The reason they are marginal has nothing to do with beehive springs (not that you were saying it was POS). Non-linear springs address a completely different failure point than what causes stock springs to fail.

A linear spring has a resonant frequency. A beehive spring is just a spring with a non-linear compression rate. It keeps the valvetrain from loping itself apart at whatever resonant frequency the spring happens to be. Tesla claimed he could bring a building down with a tiny device using this concept. Same applies to your motor.

Titanium is about 45% lighter than steel. Hollow titanium valves should give you a significant RPM capability increase. It's easier to hold a lightweight valvetrain against a cam lobe at high RPM without slapping back against the seat, or floating your valves. If you bought heads with hollow titanium valves, then you need to put a cam in your car that takes advantage of the money you already spent.

[thahemp]

Originally Posted by litle88

The reason he's asking is cause he has titanium intake valves on the heads he purchased.

I don't recall his cam or if he change it BUT his heads will flow a lot and valve train will be light. So we'll see where his setup peaks at. The will make power down low because of the mid lift flows. Can't wait to see some of his results today.

POS I agree I love it to hear guys going a Lil against the grain in the name of powa!

I went and picked this post out because I'm kinda stoked to see what is possible by taking as much weight out of the valvetrain as possible too. The only advantage to dual overhead cams is no valvetrain (per se). I like the idea of big displacement while closing the valvetrain gap on the Ford guys.