How high can you consistantly spin a stock 13b without damage?
How high can you consistantly spin a stock 13b without damage?
Eventually the water pump will cavitate but for short bursts, there is no limit.
I have heard the accessories are the limit. Electric water pump, run of the battery... it could get interesting. Someone has to have explored the outer limits of these. I suspect porting for super high RPMs might be an issue.
The stationary gear will fail first, barring any overheating issues. I don't own one, but I've heard 9000rpm as kind of a roadrace redline.
I would never have guessed the accessories would be a problem.
Wonder if it would help the stationary gear or the rest of the internals to have a good dampener on it.
I have heard that for a stock engine with accessories 8500 was safe and at around 9-10K the eccentric shaft starts to flex with rather bad consequences. I don't remember where I read it. I kept my 200K miles 12A under 7500.
The accessories are the weak-link, but the engines generally stop making power well before 9k.
rotard wrote: The accessories are the weak-link, but the engines generally stop making power well before 9k.
Sounds like a good reason for a peripheral port to me 
Toyman01 wrote: I have heard that for a stock engine with accessories 8500 was safe and at around 9-10K the eccentric shaft starts to flex with rather bad consequences.
What he said
My old boss and I ran into problems with the alternator from high revs...granted, this was on a well-worn 12A. The car was pretty well doomed anyway, so we were off-roading it in an old cherry orchard owned by the grandmother of a friend and got high-centered on a stump. He was driving and figured that more revs was the way to get unstuck (kinda makes sense, doesn't it?) but the rear wheels were mostly off the ground. The alternator pulley was actually what first gave up the ghost. YMMV
I used to carry 9300 rpm in 4th gear down the front straight at Road Atlanta in my RX-3 built to ITA specs(ISC built motor with 4.8 rear gear) rather than shift into fifth gear and immediately shift back to fourth for turn one. My good laps were 1:32 flats with the Dip. We werent allowed to run underdrive pulleys in those days so it was the accessories that gave up the ghost first.
Its not just rotaries that give you accessory problems, either. 7400 rpm in a Neon means no power steering belt, and alternators are expendable too. Stock crank pulley on a Neon is huge.
I fried a couple alternators in my SHO.
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