TR230 cam, what valve springs?
#21
10 Second Club
iTrader: (10)
If you have a straight spring(not beehive) on there now then you will need to get a set of stock or titanium retainers to fit the 918's. But personally I would use a dual spring to help stabilize the valvetrain with the heavier rockers. If you go the 918 route I would recommend getting some shims to set the install height .050" from coil bind to maximize spring pressure. BTW - The higher spring pressure does not decrease HP because there is always a spring closing and opening at the same time and the pressure of the closing spring will assist in the opening the other. That is a common valvespring myth.
#23
John,
Could you look at these two manley springs and tell me which one would be better.
the .600 lift spring is 150/355
the .650 lift spring is 150/375
http://www.manleyperformance.com/nic...vetrain.shtml#
Thanks for the help.
#25
TECH Senior Member
iTrader: (8)
If you have a straight spring(not beehive) on there now then you will need to get a set of stock or titanium retainers to fit the 918's. But personally I would use a dual spring to help stabilize the valvetrain with the heavier rockers. If you go the 918 route I would recommend getting some shims to set the install height .050" from coil bind to maximize spring pressure. BTW - The higher spring pressure does not decrease HP because there is always a spring closing and opening at the same time and the pressure of the closing spring will assist in the opening the other. That is a common valvespring myth.
I tend to agree with this or at least 1518's. If that cam made power past 6500 I would say duals for sure.....
#27
TECH Senior Member
iTrader: (8)
I realize that but those HS rockers are heavier and require more spring to control. Not sure about agressive the ramp rates of your cam are but that has an effect on valve control too. But as long as TR knows you are running HS RR's and say it is ok I would be good with it though. Those guys do this everyday...
#34
LSX Mechanic
iTrader: (89)
I installed more sets of 918's the past 2 years than I can remember, and I've yet to have one failure. Comp did have a bad batch 4-5 YEARS ago, but most spring breakages I see are user/installer error.
That being said, if you can get away with a beehive do it. Less weight on the valvetrain is a good thing. The TR230 will run on a single spring properly set up for at least 25,000-30,000 miles without the need to replace springs.
That being said, if you can get away with a beehive do it. Less weight on the valvetrain is a good thing. The TR230 will run on a single spring properly set up for at least 25,000-30,000 miles without the need to replace springs.