04-20-2010, 10:01 AM #1
hou many are running 9000 RPM now???
yes i like to know how many people are running 9000 RPM know and what was or is the problem ?
04-20-2010, 12:17 PM #2
04-20-2010, 12:23 PM #3
04-20-2010, 12:30 PM #4
- Join Date
- Sep 2007
- Lexington, Ky
Even an OEM bottom end should handle 9k RPM's fine. Lightened pistons, and a crank re-balanced for them would ensure such. The main issue with running 9k + RPM's is the valvetrain. I'm fairly certain most people running a 9k redline have changed nothing more than running lightened(Ferrea) valves and a performance/Riva valvetrain kit. I wouldn't run oem springs with just lightened retainers though. Nor would I run a 51 (06+) cam. You'll have less chance of floating a valve with a 28/29 cam as the ramp rate is less aggressive.
04-20-2010, 12:37 PM #5
04-20-2010, 06:47 PM #6
Better using a good RR cam, and porting to suit, then the torque really comes out of the engine.
Got a 9k+ in my 'Doo.
I think the bottom of the motor is as strong as, just the top is roumored to be iffi at this kind of RPM.
Like R88 says, meke sure it is a fresh motor, it eliminates all doubt.
04-20-2010, 07:04 PM #7
I'm running 9100 ECU on my conversion
04-20-2010, 08:57 PM #8
04-20-2010, 09:57 PM #9
04-20-2010, 10:29 PM #10
Ran a motor for over a year and 100+ hours with a 9200 ECU without issue. Pump was always propped to be right against the limiter to squeeze out every last bit of boost all the time. Ski was run very hard every weekend and raced evry chance I got. Only internal engine mod was a Riva valvetrain upgrade. Unfortunatly the motor was an 08 and it fell victim to the soft rings they had. Nothing happened other then fuel started getting in the oil. Pistons, bearings looked like brand new. I've had to rebuild 5 of these 08 motors with the same problem and only one other had a 9k ECU.
It has more to do with the tune then the rpms IMO. My ski ran an ET Extreme most of the time making 17+ at 9k and a Race charger after that making 20psi at 9100.
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