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02-28-2011, 08:53 PM
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CC Member
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Join Date: May 2010
Location: charlotte nc,
nc
Cobra Make, Engine: contemporary #3072 , 390 big block, red no stripe
Posts: 18
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Not Ranked
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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02-28-2011, 09:09 PM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
who build the motor and was it dyno'ed?
around here we can get a car dyno'ed for $50 to $100.
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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02-28-2011, 09:14 PM
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CC Member
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Join Date: May 2010
Location: charlotte nc,
nc
Cobra Make, Engine: contemporary #3072 , 390 big block, red no stripe
Posts: 18
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Not Ranked
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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02-28-2011, 10:08 PM
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CC Member
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Join Date: Oct 2003
Location: Bainbridge Island,
WA
Cobra Make, Engine:
Posts: 709
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Not Ranked
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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03-01-2011, 03:51 AM
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Senior Club Cobra Member
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Join Date: May 2001
Location: Florence,
AL
Cobra Make, Engine: RCR GT 40 & 1966 Fairlane 390 5 speed
Posts: 4,511
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Not Ranked
As much as I dislike MSD, I would suggest you install a MSD for the rev limiter protection and set it at 5500.
Dwight
__________________
''Life's tough.....it's even tougher if you're stupid.'' ~ John Wayne
"Happiness Is A Belt-Fed Weapon"
life's goal should be; "to be smarter than inanimate objects"
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03-01-2011, 05:56 PM
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CC Member
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Join Date: May 2008
Location: Sacramento,Ca.,
Ca.
Cobra Make, Engine: Midstates (2001)
Posts: 1,724
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Not Ranked
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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03-01-2011, 09:18 PM
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CC Member
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Join Date: Nov 2000
Location: Flower Mound, TX,
tx
Cobra Make, Engine: Lonestar LS 427, Keith Craft 501,Toploader
Posts: 883
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Not Ranked
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.
__________________
" It ain't no big deal" 
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03-03-2011, 05:03 AM
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Senior Club Cobra Member
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Join Date: May 2007
Location: Mesa,
AZ
Cobra Make, Engine: Contemporary Classic, 428 FE CCX 3069
Posts: 7,506
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Not Ranked
About 6K is the limit for my 428 FE..
__________________
Dan in Arizona
CCX3209
"It's a great car and I love it, but it doesn't do 'SLOW' very well."
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03-03-2011, 06:10 AM
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Senior Club Cobra Member
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Join Date: Mar 2001
Location: Southern Connecticut,
CT
Cobra Make, Engine: SPF - 351W, 944 non-turbo
Posts: 2,105
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Not Ranked
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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03-03-2011, 08:09 AM
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CC Member
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Join Date: Aug 2010
Location: San Antonio Valley Ca,
ca
Cobra Make, Engine:
Posts: 1,275
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Not Ranked
Quote:
Originally Posted by Bob In Ct
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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