Hello Guys, lately i have been having issues on the drag car bending exhaust valves even after one-two events, and I am curious what valves are you people using
on their high Hp cars 1000+ whp.
I have tried both the Ferrea Competition Plus valves and Supertech Inconel.
The only way they survive if i go very rich on the tune and hence reduce the egts temperatures but obviously power suffers.

 

did u try oem valves?

 

contact 4piston about your issue

 

Are you shutting down as soon as your run is over? Not letting run for a bit after run... Or on the limiter too much?

 

No we actually go back to the pits with engine started so to let her cool slowly and i dont think she stays on the limiter much more than necessary.
I am sure that burnout and launch does not help the situation!!!
What sort of EGTs are you running on top end .......and sorry i forgot to mention that i am on E85R fuel

 

Its been so long that i can't remember if mine are 6000's or comp plus. I think i run comp plus ferrea on the exhaust and 6000 on the intake. I also ceramic coat them through Coatings M.D.

 

We have been running the Ferrea Comp Plus valves with no issues (K20 engine). No EGT sensors, but we target 12.0:1-11.8:1 AFRs at WOT. Pump E85, 42 psi, over 1000hp, best pass yet 8.93@167.

 

i'm curious to what rods and pistons you are running?. Could be a piston to valve clearance issue.