ColtonS3290

I have just bought some comp springs, 942-16 part number, but they cam with another set of spring along with the main ones, i dont think they are the damper spring cause there is already a flat wound spring inside the main spring,i have no idea where they go at all? the picture of them is on my album if you need to see what im talking about.

Starfury

Honestly, no idea. I'd call Comp Cams' tech support on Monday.

001mustang

Can use a scale to determine actual seat load, open load and spring rate. Not a bad idea to measure weight of lifters, pushrods and RA in case you want to estimate valve float rpm.

I like to do a rough hyd lifter bleed down check before installing lifters; I think COMP likes the lifters bleed down prior to install.

My flat tapet only uses 1 spring and 1 damper...you must roller lifters which uses an additional inner spring to control the extra mass and aggressive ramp.

Starfury

Comp says to soak the lifters in oil prior to install, but not to pump them up.

001mustang

I won't install any more hydraulic lifters w/o testing to make sure they bleed down consistently. Fast bleeders are power robbers, noise makers and no fun to change.

I agree to bleed down lifters before installation so cam starts spinning w/ reduced stress.

I like drill prime w/n moderation.

No idea why everybody soaks flat tappets overnight; makes sense to soak roller. Won't hurt to soak so why not.

Best to break in flat tappet w/ weak springs; no inner spring for sure. Can install inner spring before break in on roller cams from what i understand.
I would be tempted too overkill and break in roller w/o inner spring; probably a time waster.

mr_velocity

I'd be concerned about not having the proper seat pressure with rollers. The ramp rates are rather aggressive and you may not keep the roller on the cam. I guess if you kept the RPMs low it wouldn't be a problem but I'd actually be afraid of damaging something.

Starfury

Roller cams don't need a break in period. Both the cam and lifter rollers are made of steel rather than cast iron and are not prone to premature wear.

001mustang

yeah...absolutely.... don't wanna float the valves....pistons and valves need their personal space...

ColtonS3290

But no one knows what the smaller spring is for?

001mustang

inner spring for more power and more control.
verify u have correct springs for your system.
verify correct rate, installed ht, retainers, shims, cups, etc.