Valve float questions
Alright guys, got a few questions for y'all. I know this setup is not ideal, meaning I'm not surprised it's floating the valves, but I would think that with the given setup, it wouldn't float until around 7k. Here's the setup:
Comp Cams Magnum 286H-10 (hydraulic flat tappet) .490/.490 236/236 @.050dur, 286/286adv. 110LSA, 106ICL, Exhaust Closes 30ATDC, Exh. Opens 70BBDC, Intake Opens 35BTDC, Int. Closes 70ABDC.
The Cam calls for these springs:
Top: OD 1.065 ID .650
Bottom: OD 1.240 ID .825
Seat Load 110 @1.700
Open Load 292 @1.175
Coil Bind 1.115
I bought a set of patriot aluminum heads back in '08 (yeah, I know) and I used the springs furnished with the heads which are:
Max. Valve Spring Lift: 0.575''
Spring Pressure Closed: 115 lbs. @ 1.800''
Spring Pressure Open: 310 lbs. @ 1.225''
Which is over both open and closed spring pressure recommended, but for whatever reason, I'm getting some pretty nasty valve float starting at around 6k, and it's basically a rev limiter and hangs around 6,500 which is normally where I shift any way. Could this be a problem due to the apparent installed height issues the heads may have? I've read up that the installed height on these heads can be an issue, but this was on a big block forum, on BBC heads.
Anyway, I floated them pretty good today, and I'm wondering if there's any danger running it the way it is, basically what I'm asking is 1) given the valve timing events, is it possible to kiss the valves to the pistons, if I already haven't, and could it possibly eat a valve? and 2) Is this more of a problem with the heads do you think, or simply because it's a heavy hydraulic lifter? I know the ramps on the cam also effect how the valves act/float etc... But I've heard the ramps are "lazy" on the Magnum series, but I don't know that much about cams. I want to go to the track this weekend, but I don't want to go home with a hurt motor. I plan to go LS over the winter break, but would like to maintain drivability until then.
The Deck height is .015" Distance in the hole, and a .025" gasket, so .040" quench, if that gives you an idea of how close the valves are to the piston.
Sorry for the long read, I just wanted to give y'all all of the info, I know it helps. One last thing... I see guys running stock LS hydraulic roller lifters on some pretty aggressive cams, with $60.00 ebay china springs, and they spin to 7k with 15-20lbs of boost with absolutely no float. What gives?
Thanks in advance!
The only Mustang I'd ever own is a Fender.
'68 333" Camaro
'14 5.0 Mustang