stroke me...
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From: West Palm Beach, FL
Originally Posted by jaxtcracer
this should be an interesting thread once brett gets his parts!
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Scikotics
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From: Minneapolis, MN
I think for most "typical" motors, 24m/s is about the upper limit for piston velocity. But that is more of a rule of thumb I believe.
At 7300 rpm you are flirting with 24m/s (if my quick calcs are correct). So if I were a race team, I wouldnt hessitate as much, since rebuilding a motor is no abnormal thing in racing. If it were my daily driver, I wouldnt attempt it, regardless of valvetrain.
Now, you can destroke a motor if you can find/make the parts. Doing that would allow a higher safe redline. The othe option is to weigh the pistons and rods, then figure their inertia at say, 23 m/s. Then find lighter components and run them up to the speed at which they will still be under that inertia number. But, there is also the items of oiling and spinning the crank at those speeds. If the block cant properly oil and cool itself properly at those rpm ranges, you are going to kill it anyway.
So the best answer is to do it on a motor you can afford to rebuild. If you do, let us know how long it lives that way
In other words, be the guinea pig!
Paul, I am guessing if it is a race team, they probably tear thier motor down fairly frequently, but if not, how long has it held together being run that fast?
At 7300 rpm you are flirting with 24m/s (if my quick calcs are correct). So if I were a race team, I wouldnt hessitate as much, since rebuilding a motor is no abnormal thing in racing. If it were my daily driver, I wouldnt attempt it, regardless of valvetrain.
Now, you can destroke a motor if you can find/make the parts. Doing that would allow a higher safe redline. The othe option is to weigh the pistons and rods, then figure their inertia at say, 23 m/s. Then find lighter components and run them up to the speed at which they will still be under that inertia number. But, there is also the items of oiling and spinning the crank at those speeds. If the block cant properly oil and cool itself properly at those rpm ranges, you are going to kill it anyway.
So the best answer is to do it on a motor you can afford to rebuild. If you do, let us know how long it lives that way
In other words, be the guinea pig! Paul, I am guessing if it is a race team, they probably tear thier motor down fairly frequently, but if not, how long has it held together being run that fast?
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From: Western NY
Originally Posted by engifineer
Paul, I am guessing if it is a race team, they probably tear thier motor down fairly frequently, but if not, how long has it held together being run that fast?
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Joined: Jul 2007
Posts: 3,773
From: West Palm Beach, FL
Originally Posted by engifineer
I think for most "typical" motors, 24m/s is about the upper limit for piston velocity. But that is more of a rule of thumb I believe.
At 7300 rpm you are flirting with 24m/s (if my quick calcs are correct). So if I were a race team, I wouldnt hessitate as much, since rebuilding a motor is no abnormal thing in racing. If it were my daily driver, I wouldnt attempt it, regardless of valvetrain.
Now, you can destroke a motor if you can find/make the parts. Doing that would allow a higher safe redline. The othe option is to weigh the pistons and rods, then figure their inertia at say, 23 m/s. Then find lighter components and run them up to the speed at which they will still be under that inertia number. But, there is also the items of oiling and spinning the crank at those speeds. If the block cant properly oil and cool itself properly at those rpm ranges, you are going to kill it anyway.
So the best answer is to do it on a motor you can afford to rebuild. If you do, let us know how long it lives that way In other words, be the guinea pig!
Paul, I am guessing if it is a race team, they probably tear thier motor down fairly frequently, but if not, how long has it held together being run that fast?
At 7300 rpm you are flirting with 24m/s (if my quick calcs are correct). So if I were a race team, I wouldnt hessitate as much, since rebuilding a motor is no abnormal thing in racing. If it were my daily driver, I wouldnt attempt it, regardless of valvetrain.
Now, you can destroke a motor if you can find/make the parts. Doing that would allow a higher safe redline. The othe option is to weigh the pistons and rods, then figure their inertia at say, 23 m/s. Then find lighter components and run them up to the speed at which they will still be under that inertia number. But, there is also the items of oiling and spinning the crank at those speeds. If the block cant properly oil and cool itself properly at those rpm ranges, you are going to kill it anyway.
So the best answer is to do it on a motor you can afford to rebuild. If you do, let us know how long it lives that way
In other words, be the guinea pig! Paul, I am guessing if it is a race team, they probably tear thier motor down fairly frequently, but if not, how long has it held together being run that fast?
just the answer i was looking for. i would think that 7500rpm would be pretty safe on a 96mm stroke, considering honda revs the k24 to 7300rpm on a 99mm stroke. now the gearing on the tc wont suck so bad.
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From: Lake Worth Florida
I'll be the test subject, I have my head ported (gasket matched) and a 5 angle valve job, other than that she's all original. I'm planing on pushing it as far as it'll go (hoping for 8500, but I won't settle for less than 7500).
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KingLou
Scion xA/xB 1st-Gen Drivetrain & Power
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Apr 20, 2005 12:27 AM
