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redline?
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http://www.clubcobra.com/forums/contemporary-classic-forums/109400-redline.html)
| seeda |
02-28-2011 07:53 PM |
redline?
cant seem to get a good feel for the max rpm for my 390 big block. I was wondering what was a safe rev limit.
thanks too all.
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| Dwight |
02-28-2011 08:09 PM |
who build the motor and was it dyno'ed?
around here we can get a car dyno'ed for $50 to $100.
Dwight
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| seeda |
02-28-2011 08:14 PM |
the car was built out in vegas in the mid 80s. its a 390 thats been bored .030 over. hi pro intake with 750 pumper. tach has not worked since day one and is now fixed. I just drove it hard and by feel. I got all the bugs out this winter and dont want to float a valve.
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| Zoom This |
02-28-2011 09:08 PM |
Sounds like a "mystery motor" to me. Not knowing anything about the build OR builder I wouldn't take any unknown past 5000-5500 rpm on a good day. Most any big block is comfortable at 5500-6000 rpm for max HP. Good luck.
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| Dwight |
03-01-2011 02:51 AM |
As much as I dislike MSD, I would suggest you install a MSD for the rev limiter protection and set it at 5500.
Dwight
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| rustyBob |
03-01-2011 04:56 PM |
My 390 has cast pistons and i have turned it to 6k with no problems (yet) and its 10 years old.....
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| Tim Brewer |
03-01-2011 08:18 PM |
I think to properly find the rev limit of any engine, it would be a good idea to have it dynoed to see where the power starts to drop off. So, a little before the power drops would be the rev limit.
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| Danr55 |
03-03-2011 04:03 AM |
About 6K is the limit for my 428 FE..
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| Bob In Ct |
03-03-2011 05:10 AM |
Remember, at 6,000 RPM those pistons are going up and down 100 times per second. Is there a need to go any faster?
Bob
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| redmt |
03-03-2011 07:09 AM |
Quote:
Originally Posted by Bob In Ct
(Post 1113372)
Remember, at 6,000 RPM those pistons are going up and down 100 times per second. Is there a need to go any faster?
Bob
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Back in the late 70's and early 80's we were very heavy in truck and tractor pulling. I used to build various configurations of FE's from 390-432 inches and spin them up around 9000 rpm +. When they made the "big noise" the results were catastrophic. When these engines went south you were lucky to salvage the intake manifold. I had 1 motor with lifters jammed behind the flywheel. I wouldn't spin one with stock type components any higher that 5500 or how much $$ you can afford to spend, or whichever comes first. |
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