Thread: machining for teflon valve seals

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You probably wouldn't run into rpm related harmonics problems with your installation, but you can when running single springs at elevated rpm levels.

Little brother runs a 500 cid DRCE engine in his 8.13 second Henry J drag racer.
Rpms are 6800 at launch and 9200 rpm when shifted. (4-speed Lenco.)

He ran single springs for a while and every run he broke one.

The breakage quit after he went to dual springs.
The inner spring - whether round wire or flat spring stock - act as vibration dampers and keep the main - outer - spring from doing weird things harmonics-wise and self destructing.

Originally Posted by C9x

You probably wouldn't run into rpm related harmonics problems with your installation, but you can when running single springs at elevated rpm levels.

Little brother runs a 500 cid DRCE engine in his 8.13 second Henry J drag racer.
Rpms are 6800 at launch and 9200 rpm when shifted. (4-speed Lenco.)

He ran single springs for a while and every run he broke one.

The breakage quit after he went to dual springs.
The inner spring - whether round wire or flat spring stock - act as vibration dampers and keep the main - outer - spring from doing weird things harmonics-wise and self destructing.

OH MY !!! SINGLE SPRINGS TRYING TO RUN 9,200 RPM'S ??? WHAT ??? CAN YOU SAY COIL BIND !!!

Originally Posted by erik erikson

OH MY !!! SINGLE SPRINGS TRYING TO RUN 9,200 RPM'S ??? WHAT ??? CAN YOU SAY COIL BIND !!!

And bent pushrods.

Originally Posted by erik erikson

OH MY !!! SINGLE SPRINGS TRYING TO RUN 9,200 RPM'S ??? WHAT ??? CAN YOU SAY COIL BIND !!!

Coil bind wasn't a problem.

Springs can do weird things when mechanically excited.
A good example may be a Slinky.
Hold it up so it's stretched out fairly well, strike it gently with a screwdriver or metal rod.
Take note of the oscillations produced.

It's especially interesting to press the upper end of the Slinky to your ear, strike it and listen to the jangling noises it makes.

High speed motion pictures have shown valve springs operated at high speeds do some weird things.
No small wonder they break.

Originally Posted by C9x

Coil bind wasn't a problem.

Springs can do weird things when mechanically excited.
A good example may be a Slinky.
Hold it up so it's stretched out fairly well, strike it gently with a screwdriver or metal rod.
Take note of the oscillations produced.

It's especially interesting to press the upper end of the Slinky to your ear, strike it and listen to the jangling noises it makes.

High speed motion pictures have shown valve springs operated at high speeds do some weird things.
No small wonder they break.

Sell crazy somewhere else.
We are all stocked up here.L.O.L.