Scat 4340 cranks - what RPM do you turn?

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Scat 4340 cranks - what RPM do you turn?

Post  busta on April 15th 2013, 8:31 am

Just wondering what sort of RPM you spin your 4340 cranks to. I have a 4.5" here ready to go into a new engine and curious what guys are spinning them to.

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Re: Scat 4340 cranks - what RPM do you turn?

Post  bigblok2000ranger on April 15th 2013, 8:45 am

Had my 4.300" to 7800 couple times in my 523 expiementing with shift points. 7400 was best with that deal for me.
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Re: Scat 4340 cranks - what RPM do you turn?

Post  dfree383 on April 15th 2013, 8:51 am

My 4.300 when it was a 528 7500, its in a 572 and will be seeing 7200ish in the next build.

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Re: Scat 4340 cranks - what RPM do you turn?

Post  richter69 on April 15th 2013, 9:05 am

4.3, been 7900 a time or two, goes 7600 on a regular basis.



rpm would matter more about the valvetrain than the crank IMO
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Re: Scat 4340 cranks - what RPM do you turn?

Post  Barney on April 15th 2013, 10:20 am

4.5 shift it at 7800.
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Re: Scat 4340 cranks - what RPM do you turn?

Post  bbf-falcon on April 15th 2013, 3:08 pm

To answer your ?.imo a Scat 4340 will be fine in the mid 7k range for quite a few passes,but anything higher than that (8k or higher) for a substantial duration,I would go a custom billet piece.jmo

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Re: Scat 4340 cranks - what RPM do you turn?

Post  BradB on April 15th 2013, 6:01 pm

8000+ rpm, pulling truck app. Not sayin its wise but its done on a regular basis. Hell, we were going 7500-8000 with the cast scats. Ya do what ya can with what ya got sometimes even if It's risky.

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Re: Scat 4340 cranks - what RPM do you turn?

Post  richter69 on April 15th 2013, 7:13 pm

we shift our 3" stroke deal at 8400, its been over 9000 a few times...... Wink
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Re: Scat 4340 cranks - what RPM do you turn?

Post  John Myrick on April 15th 2013, 7:32 pm

Been 6900 bouncing off the limiter with a 4.5"
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Re: Scat 4340 cranks - what RPM do you turn?

Post  Lem Evans on April 15th 2013, 8:10 pm

BradB wrote:8000+ rpm, pulling truck app. Not sayin its wise but its done on a regular basis. Hell, we were going 7500-8000 with the cast scats. Ya do what ya can with what ya got sometimes even if It's risky.

The truck pull guys are king when it comes to the rpm thing Smile

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Re: Scat 4340 cranks - what RPM do you turn?

Post  IDT-572 on April 15th 2013, 10:00 pm

A short stroke BBF 4340 crank wont be your problem when turning high rpm, but everything tied to it may be suspect............... Twisted Evil
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Re: Scat 4340 cranks - what RPM do you turn?

Post  hienergy557 on April 15th 2013, 10:11 pm

Mine has a 4.5" crank, 7200 R.P.M at the finish line.
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Re: Scat 4340 cranks - what RPM do you turn?

Post  Frank Merkl on April 16th 2013, 1:14 am

we spin 8700-9300 but the bottle will do that!
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with a 2200 gr bobweight
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