turbo/raising redline/floating valves

[iceiso]

aight, i got a couple more questions...

1. Is it a good idea to raise redline on a turbocharged motor? vs NA?
2. What is a floating valve?
3. What parts do you need to upgrade to prevent it?
4. What is the process of actually raising the redline? (ie. hondata tuning and what to do)

thanks!

[killah_xft]

unless you plan to reinforce the rods/pistons and basically every moving part in your engine I would suggest not going above the factory redline. you can, but your engine has a higher fail rate once you break the redline. More than likely one of the tie rods would snap off and dangle off the crankshaft and go through your oilpan on one of it's revs. Floating Valve is a valve that never closes from _--_ to ___ the floating valve never makes a complete seal thus the intake and exhale of the motor is pretty powerless (robbing you of power, and unexploded gases), which is why you should replace the valvesprings, and possibly the valves, and have them well oiled, and properly seated. if you do want to raise the redline, you should get a higer rated tachometer and just hook that up instead of your stock meter. ones rated up to 10,000 rpm you can buy at any auto store. but I reccomend you don't go too high above the factory rev limit, you risk blowing your engine. and after a certain point you raising the redline on a turbocharged motor the turbo will loose effectiveness the higher the rev range.. because the compressor fan can only spin so fast to drive the intake fan... higher revs will allow you a better shift change, and lower your times, but only to an extent.

good luck, anyone want to fill in on what I missed, and possibly something I said wrong?

[Neutrino]

to add to what kilah said be very afraid of floating valves....it can actually damage your engine.....it happens at very high rpm because the valvespring rates are not up to the job of pushing the valve fast enough back up....it can result in the camshaft lobes losing the contact with the valves


to compensate get some lightweight valves and high rate valvesprings



also the bottom end its important.....get lightweight but strong rods and balance the crackshaft....lighweight pistonts can help too