F20 engine
10-21-2006, 06:53 PM
#11
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Externally balanced engine is one which has an intentionally unbalanced counterweight in the flywheel and/or harmonic balancer designed to counter an unbalance in the crank/rods/piston assembly.
A good example is 454 big block Chevy. They could not get enough counterweight on the crank to cancel out the rods/pistons. So they left that out of balance, then cancelled that unbalance with an equal and opposite unbalance in the damper. 302 Ford also has this.
A good example is 454 big block Chevy. They could not get enough counterweight on the crank to cancel out the rods/pistons. So they left that out of balance, then cancelled that unbalance with an equal and opposite unbalance in the damper. 302 Ford also has this.
10-23-2006, 04:38 PM
#12
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well my celica doesnt have balance shafts and I been runnin race pulleys on it for about 2 years. its redline is slightly lower 8300 rpm. So I wonder if any bad could come from pulleys?
10-24-2006, 07:39 AM
#13
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www.proautosports.com has 3 s2k's motors, all with very long track lives, and all of them are running reduced weight crank pulleys. None of those cars are experiencing any issues...
I've spoken with them personally, and I feel it is safe to run lighter pulleys on my motor...the F20C5. I don't know how much is different as far as harmonics between my engine and the newer F22 motor, but as far as AP1's go, their testing and constant tracking of the cars is enough proof for me.
Feel free to argue, as I am no harmonics expert. The information provided from me is opinion, and any facts I expressed are 2nd hand in nature at best. Outside of forums, any modifications should be fully researched before attempted. Asking a bunch of anonymous forum talkers and basing your decisions solely on the provided feedback from unknown expertise is not wise.
I've spoken with them personally, and I feel it is safe to run lighter pulleys on my motor...the F20C5. I don't know how much is different as far as harmonics between my engine and the newer F22 motor, but as far as AP1's go, their testing and constant tracking of the cars is enough proof for me.
Feel free to argue, as I am no harmonics expert. The information provided from me is opinion, and any facts I expressed are 2nd hand in nature at best. Outside of forums, any modifications should be fully researched before attempted. Asking a bunch of anonymous forum talkers and basing your decisions solely on the provided feedback from unknown expertise is not wise.
10-30-2006, 02:26 AM
#14
Originally Posted by wildcardtrd,Oct 24 2006, 09:39 AM
www.proautosports.com has 3 s2k's motors, all with very long track lives, and all of them are running reduced weight crank pulleys. None of those cars are experiencing any issues...
I've spoken with them personally, and I feel it is safe to run lighter pulleys on my motor...the F20C5. I don't know how much is different as far as harmonics between my engine and the newer F22 motor, but as far as AP1's go, their testing and constant tracking of the cars is enough proof for me.
Feel free to argue, as I am no harmonics expert. The information provided from me is opinion, and any facts I expressed are 2nd hand in nature at best. Outside of forums, any modifications should be fully researched before attempted. Asking a bunch of anonymous forum talkers and basing your decisions solely on the provided feedback from unknown expertise is not wise.
I've spoken with them personally, and I feel it is safe to run lighter pulleys on my motor...the F20C5. I don't know how much is different as far as harmonics between my engine and the newer F22 motor, but as far as AP1's go, their testing and constant tracking of the cars is enough proof for me.
Feel free to argue, as I am no harmonics expert. The information provided from me is opinion, and any facts I expressed are 2nd hand in nature at best. Outside of forums, any modifications should be fully researched before attempted. Asking a bunch of anonymous forum talkers and basing your decisions solely on the provided feedback from unknown expertise is not wise.
10-30-2006, 03:45 AM
#15
[QUOTE=snakeeater,Oct 21 2006, 08:53 PM] Externally balanced engine is one which has an intentionally unbalanced counterweight in the flywheel and/or harmonic balancer designed to counter an unbalance in the crank/rods/piston assembly.
A good example is 454 big block Chevy.
A good example is 454 big block Chevy.
10-30-2006, 04:03 AM
#16
Originally Posted by S|2ocK,Oct 23 2006, 06:38 PM
well my celica doesnt have balance shafts and I been runnin race pulleys on it for about 2 years. its redline is slightly lower 8300 rpm. So I wonder if any bad could come from pulleys?
You can improve the performance by replacing the other pulleys, besides the crank pulley. There are lightened harmonic balancers (with crank pulley) available on the market. Fluid Dampr and ATI are two popular companies. ATI offers F20 dampeners on request.
10-30-2006, 11:25 AM
#17
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Originally Posted by slipstream444,Oct 30 2006, 07:45 AM
The bottom line is to ask yourself - is the longevity of your motor worth 5-8 BHP?
Read:
http://www.atiperformanceproducts.com/prod...amper_dinan.htm
Read:
http://www.atiperformanceproducts.com/prod...amper_dinan.htm
"For those interested in a more in depth and technical explanation of this topic, the reference book is Advanced Engine Technology, written by Heinz Heisler MSc,BSc,FIMI,MIRTE,MCIT."
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