.609 lift with .600 lift springs?
11-23-2002, 02:03 PM
#1
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.609 lift with .600 lift springs?
A friend of mine has a '00 TA and he is in the middle of a head and cam swap. Will he be alright for a while running a cam with .609 lift and springs that say they max out at .600?
EDIT: MTI told him they were the springs to use
EDIT: MTI told him they were the springs to use
11-23-2002, 06:00 PM
#3
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Mike- It's Griffins. He is getting 2.05/1.60 valves with a 7 angle valve job. I think it is overkill for a stock bottom end but he says in the not too far future he will be getting a stroker kit.
11-23-2002, 09:45 PM
#4
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The only way to know if they will be ok is to set them up with the desired installed height, check for coil bind. You can set them up taller than the specified installed height, but you will lose some preasure at that height! New springs might be the safer choice!
Check out the link below for some info that may help you guys out.
http://www.cranecams.com/morvtfaq.htm
Check out the link below for some info that may help you guys out.
http://www.cranecams.com/morvtfaq.htm
11-23-2002, 10:42 PM
#5
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If the spring is installed at the recommended height then the .600" max lift means they have .060" clearance between the coils at max lift. Going to .609" lift reduces that minimum clearance of .060". Although you won't get coil bind, it's not good for the springs.
Install the spring at least +.009 higher than the recommended install height. This usually means cutting the spring pocket down, using longer valves or using special keepers (valve locks) that position the retainer higher on the valve.
The higher install height will reduce the amount of closed spring pressure and could cause valve float but I doubt .009" will make a huge difference.
Make sure the valve guides are cut down for the extra lift or the bottom of the spring retainers will hit the top of the guides.
Install the spring at least +.009 higher than the recommended install height. This usually means cutting the spring pocket down, using longer valves or using special keepers (valve locks) that position the retainer higher on the valve.
The higher install height will reduce the amount of closed spring pressure and could cause valve float but I doubt .009" will make a huge difference.
Make sure the valve guides are cut down for the extra lift or the bottom of the spring retainers will hit the top of the guides.
11-24-2002, 01:40 AM
#6
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The reduction in seated height will give you less seated pressure which as you said will not help. I think the best solution here is to go with better springs. Hell they are under $100, that's better than replacing bent valves later.
BTW what springs are they?
Bret
BTW what springs are they?
Bret
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