Long story short, engine over reved, snapped two valves, three more valves flush with the retainers. I could use a little advice as to where to go from here.

-Thinking Toda springs AP2 retainers, but do I go with new OEM valves?
-If I do go aftermarket valves do I need to modify head?
-If I get a new Cam do I have to tune it? (will a mild cam no tune help any)

What I would like to do is keep it as track reliable as I can I.E. being able to do road course/autox/things of the like and have it be a safe performing engine that way I can build the rest as my driver experience increases... long term this will be a track vehicle with occasional meet attendance.

At a crossroad with plenty of time/money but not much knowledge, can I get some help from HT?

 

Most people just run stock cams w/full OEM AP2 valvetrain. No real need for camshafts as OEM are quiet aggressive.

 

Okay, I'll research that, I assume the can do just fine at 9k as opposed to 8k?

 

Yes, it will be fine. I've seen tons of guys running 500+whp (turbo) DD s2k's with the OEM AP2 valves/retainers/springs/etc in a AP1 head. GL with you're build.

 

Have you taken the engine apart yet? Broken valves usually rattle around damaging the Pistons, cylinder walls and frag the combustion chamber of the head....so if you're thinking you can just drop in some new valves, you are likely going to find buying a new long block easier and cheaper.

 

Off topic...but on topic

 

yeah the valves fused into the guides (by the luck of god) and the piston heads are fine, all this confirmed by snap-on's mini camera lol

 

LMAO, yeah thats pretty much it.

 

What about using the bisimoto retainers and valves? how are these compared to other aftermarket alternatives?

 

Well, Bisimoto has been designing and lab testing all of our valvetrain components to 14,000 rpm to insure integrity and reliability for the last 10 years. It all started with Bisi's personal race program for his race car and ended up leading to other applications such as the S2K

What is cool for the S2000, we do offer different springs rates depending on your applications needs.

For naturally aspirated setups with mild to semi-aggressive camshafts, spring rates are designed to of course prevent valve float, coil bind, and harmonic issue, however are not over sprung preventing horse power robbing tension.

I have seen issues with some other companies valve springs tensions being much greater than what is necessary and have actually reduce horse power by creating over excessive friction and binding.

For force induction setups or all motor with camshaft profiles over 0.510" lift, Bisimoto spring rates are designed to be higher. For force induction this will prevent valve float from boost pressures pressing behind the intake valve, which is one thing many do not take into consideration.

As for Bisimoto valves. They are designed to be lightweight and are manufactured from high grade stainless steel with a dished face to reduce mass. This will also assisting in preventing valve float and valve train harmonics at high rpms.

 

Thank you for the reply!

 

Your welcome. If you need any further advice, feel free to PM or give us a call at the office.