i have an f22 head with bisimoto titanium valve springs and retainers. the camshaft is a level 2 with skunk2 cam gear. What rpm can i top off the limit safely at? or maximum? keep in the mind the bottom is stock. i was thinking 7200 or 8000. what do you guys think?
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rev limit for built f22 head
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Your best bet would be to ask Bisimoto what their springs are rated at.
However, with that valvespring setup... I would think that your bottom end (assuming that it's stock) would be in trouble long before your head is. If your bottom end is stock, I wouldn't rev higher than the stock redline. You definitely don't want to put a piston into that semi-built head of yours.
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Correct. Your crank shaft has more to do with the redline of your motor than your camshafts do. If you try to spin it faster than what it is designed to do, you'll cause some serious damage. I know from talking to Julio at Bisimoto that he has an F22A stroker crank that may be able to be customized to your goals.
What intrigues me is why you went with a Skunk2 Cam Gear? Didn't even know they made such for an F22A. I imagine Bisi would have gotten you his for cheaper?'94 JDM H22A: 178whp 146wtq
Originally posted by deevergoteIf you say double dutch rudder, i'm banning you...
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Have you done any research? The level 2 powerband is advertised to max out by 5900 RPM. Your statements are unrealistic.
In my experience, if you wish to obtain anything near 100K miles of engine durability, I would not aim more than 7000 RPM on stock block. Use a quality engine oil. The lower the mileage on the stock block the better and with proper maintenance history.
The camshaft is the major contributor in determining your RPM powerband, but the block geometry can be a limiting factor if your camshaft is capable of more RPM. The engine components should be designed or chosen to work together toward a common goal.Last edited by HondaFan81; 09-06-2011, 02:51 PM.
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Originally posted by Joey GT-R View PostCorrect. Your crank shaft has more to do with the redline of your motor than your camshafts do. If you try to spin it faster than what it is designed to do, you'll cause some serious damage. I know from talking to Julio at Bisimoto that he has an F22A stroker crank that may be able to be customized to your goals.
What intrigues me is why you went with a Skunk2 Cam Gear? Didn't even know they made such for an F22A. I imagine Bisi would have gotten you his for cheaper?Originally posted by Mishakol129Do not disrespect my intelligence. I am the smartest person I know : )
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Joey, the head does play a role in rev limits. Valve float can occur when you rev too high. Of course, his upgraded valve springs make that a non-issue.
Originally posted by HondaFan81 View PostHave you done any research? The level 2 powerband is advertised to max out by 5900 RPM. Your statements are unrealistic.
What you really need to do is figure out where your engine's powerband is. Find where the power really begins, and then find where it drops off. Figure out where you need to shift up high so that the next gear will start in the powerband. That will determine your maximum necessary RPM. This can be done on a dyno, or by trial and error on a track. Start low, and work your way up. You don't need to rev to the moon... especially if you're not making any significant power up high anyway.
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Originally posted by deevergote View PostJoey, the head does play a role in rev limits. Valve float can occur when you rev too high. Of course, his upgraded valve springs make that a non-issue.
That's the most important thing to consider, right there. How high do you NEED to rev? If 5900 is where the Stage 2 camshaft stops really making power, you don't need to rev much higher than that... and that is safely within the engine's limits (not that it isn't still a strain on the internal parts, but the engine was designed to rev that high, at least!)'94 JDM H22A: 178whp 146wtq
Originally posted by deevergoteIf you say double dutch rudder, i'm banning you...
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Originally posted by wed3k View Postwith bisimoto's spring pressures, id rev it past 8k. hell ive done that on my stock valvetrain on accident.
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Originally posted by mjsstanley View PostYou have to remember that its not only about valvetrain but also the block as Deev stated . If he spends a lot of money on the valvetrain and then throw a rod because his block is stock and can't handle the power the head can , his head work will just be a waste after a piston goes through it .
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