Need Valvespring Shimming Experts..
#1
Need Valvespring Shimming Experts..
I have a 408ci motor with this cam in it and I am running twin turbos.. 224/230 .609/.604 114LSA +2 (Comp XFI lobes).. I am running Patriot Gold Extreme dual valvesprings in my AFR225 heads...
Install Height: 1.800"
Max. Valve Spring Lift: 0.660"
Spring Pressure Closed: 155 lbs. @ 1.800"
Spring Pressure Open: 410 lbs. @ 1.140"
Coil Bind: 1.090"
Retainer Material: Titanium
My question is what is the safe MAXIMUM seat pressure I can run with this spring? I am guessing somewhere around .045 and what would that bring my seat pressure up too? I hear high boost applications running around 180 to 200lbs of seat pressure..
Install Height: 1.800"
Max. Valve Spring Lift: 0.660"
Spring Pressure Closed: 155 lbs. @ 1.800"
Spring Pressure Open: 410 lbs. @ 1.140"
Coil Bind: 1.090"
Retainer Material: Titanium
My question is what is the safe MAXIMUM seat pressure I can run with this spring? I am guessing somewhere around .045 and what would that bring my seat pressure up too? I hear high boost applications running around 180 to 200lbs of seat pressure..
#6
TECH Fanatic
iTrader: (3)
Join Date: May 2003
Location: Lake Anna, VA/ Fairmont, WV
Posts: 1,795
Likes: 0
Received 0 Likes
on
0 Posts
That's alot of seat pressure for hyd roller lifters when shimmed but necessary for the setup. What lifters are you running?
#14
TECH Addict
iTrader: (11)
Valve float is when open spring pressure is insufficient to control valve motion as the valve progresses from open, past peak lift, and starts to close.
Valve spring harmonics play a large part in the equation and must me taken into account when assembling a valve train for an engine combination.
#16
12 Second Club
iTrader: (4)
Actually, insufficient closed spring pressure manifests as 'valve bounce' when the spring can't control the valve closing event.
Valve float is when open spring pressure is insufficient to control valve motion as the valve progresses from open, past peak lift, and starts to close.
Valve spring harmonics play a large part in the equation and must me taken into account when assembling a valve train for an engine combination.
Valve float is when open spring pressure is insufficient to control valve motion as the valve progresses from open, past peak lift, and starts to close.
Valve spring harmonics play a large part in the equation and must me taken into account when assembling a valve train for an engine combination.
To me valve bounce is a system that cant control the closing of the valve and it bounces on the closing ramp. I think its also been coined vavle float at the same time. Like how everyone call facial tissue "Kleenex", they seem to term anything that is an out of control system "Float"
Your term for float, I call lofting.
Not saying Im right or anyone is wrong, this is just what I see typically.
#17
TECH Addict
iTrader: (11)
I think its a terminology thing myself. I just dont know that everyone agrees with terms.
To me valve bounce is a system that cant control the closing of the valve and it bounces on the closing ramp. I think its also been coined vavle float at the same time. Like how everyone call facial tissue "Kleenex", they seem to term anything that is an out of control system "Float"
To me valve bounce is a system that cant control the closing of the valve and it bounces on the closing ramp. I think its also been coined vavle float at the same time. Like how everyone call facial tissue "Kleenex", they seem to term anything that is an out of control system "Float"
Lofting is a very common characteristic of many agressive cam lobes. The difference between valve loft and valve float is that valve loft is controlled and valve float is uncontrolled.