Floorman279

iTrader: (11)

its our aussie friend making a joke about his screename.

Che70velle

iTrader: (6)

I wouldn’t be a bit surprised if Lance (IGN-1A) had his hands in the development of the ABS system back in the day. I’m being serious. He’s a ridiculously smart guy who has an impressive family history of automotive inventions.

IGN-1A

Hi "70" thanks.
My "joke" was an "automatic" way to Brake (damage) to Valve Train.
MOST here offer little advice about Valve Seat Pressure Requirement.
MANY here ask for advice about Oil Pressure.
The HYD Roller Lifter has an internal piston that is moved by Oil Pressure.
Thus Oil Pressure affects the Valve Seat Pressure Requirement
So I ask again, What is your Seat Pressure?
Valve Bounce will destroy (drop) the valve.
Lance, a Legal American

Sm0kie

this is the beehives PSI Valve Springs – Beehive Springs – LS 1511 ML

• SPRING O.D. 1.290″
• OUTER ID 0.630″
• SEAT PRESSURE 130 lbs @ 1.800″
• OPEN PRESSURE 370 lbs @ 1.175″
• RATE lbs/in. 384.0″
• MAX LIFT 0.625″
• COIL BIND 1.100″

this is the dual springs

This is all I know about the springs ,
Valve Seals Spring specs are as follows:
•155 lbs @ 1.780"
•380 lbs @ 1.180"
•400 lbs @ 1.130
•Coil bind @ 1.070"



I know a little bit about engines but I do not know what seat pressure actually means. I belive it is the pressure that the valve seats have from the springs.

Che70velle

iTrader: (6)

Sm0kie, seat pressure is the rated pressure of the valvespring while the spring (valve) is at rest, installed on the head. Example here using your notes, the beehives have 130psi of spring pressure at 1.800” installed spring height. That means if you took that valvespring and put it in a spring press, it would measure 130psi rated pressure, compressed to 1.800”. The valve is on the seat, so that’s why it’s referred to as seat pressure. The springs are obviously set up at 1.800” installed height. You can adjust seat pressure by shimming under the springs, changing retainers, or even changing locks and retainers as a pair. Seat pressures and open pressures (often referred to as Over the Nose Pressure) are set up according to camshaft lobe intensity. A super fast opening lobe that also closes fast will need more seat pressure often, to keep the valve from bouncing on the seat. Rpm plays a big role also, as does rocker duration.

Sm0kie

Thanks that makes more sense. I was thinking valve Set at 1.800 “ might mean they are too long and cools hit the piston. My only other thing is what safe RPM I can run. I think eith a fast 92 and BTR shaft mount rocker mounts I should be able to make power to 7k if the springs are up too be task