SBC 406 For Sale!
01-18-2010, 03:46 PM
#53
Burning Brakes
Member Since: May 2009
Location: Tucson AZ
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St. Jude Donor '12
Is it a flat tappet or roller cam or something else?
I'm narrowed down to this motor or 486 big block also for sale on here. Opinions on which might be a better choice are welcome via email or PM. FWIW I intend to also buy a supercharger kit as well. I think with this motor, different cam and lower compression pistons may be needed. The big block is 2 bolt and cast crank - but it IS a big block (right??
).
Last edited by RobbSalzmann; 01-18-2010 at 08:37 PM.
01-19-2010, 12:40 AM
#54
Melting Slicks
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Member Since: Sep 2006
Location: Rockford Illinois
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I'm a little confused by this part... but I'm no expert on camshafts.
Is it a flat tappet or roller cam or something else?
I'm narrowed down to this motor or 486 big block also for sale on here. Opinions on which might be a better choice are welcome via email or PM. FWIW I intend to also buy a supercharger kit as well. I think with this motor, different cam and lower compression pistons may be needed. The big block is 2 bolt and cast crank - but it IS a big block (right??).
Is it a flat tappet or roller cam or something else?
I'm narrowed down to this motor or 486 big block also for sale on here. Opinions on which might be a better choice are welcome via email or PM. FWIW I intend to also buy a supercharger kit as well. I think with this motor, different cam and lower compression pistons may be needed. The big block is 2 bolt and cast crank - but it IS a big block (right??
).Its a hydraulic flat tappet. You would need lower compression since this motor is 11:5.1. since the motor was decked to give more compression.
01-19-2010, 08:10 AM
#55
Racer
This is a Small Block , You will need a much lower starting /static compression for a Blower unless you use Alcohol...
Final compression ratios above 12.4 to 1 are not recommended for use with "premium pump gasoline." The higher the final compression ratio the higher the octane rating of the gasoline must be in order to help prevent detonation and serious engine damage.
Final Compression Ratio (FCR) = (Boost / 14.7) + 1) x CR
Boost = Maximum Boost
14.7 = Psi. at Sea Level
CR = Engine Static Compression Ratio
Altitude plays an important role in determining compression ratios. If the altitude in the area where the vehicle is driven is significantly higher than sea level then the compression ratios will vary. To determine the effects of the altitude on a calculated compression ratio use the following formula:
Correct Compression Ratio = FCR minus [(altitude/1000) x 0.2]
Final compression ratios above 12.4 to 1 are not recommended for use with "premium pump gasoline." The higher the final compression ratio the higher the octane rating of the gasoline must be in order to help prevent detonation and serious engine damage.
Final Compression Ratio (FCR) = (Boost / 14.7) + 1) x CR
Boost = Maximum Boost
14.7 = Psi. at Sea Level
CR = Engine Static Compression Ratio
Altitude plays an important role in determining compression ratios. If the altitude in the area where the vehicle is driven is significantly higher than sea level then the compression ratios will vary. To determine the effects of the altitude on a calculated compression ratio use the following formula:
Correct Compression Ratio = FCR minus [(altitude/1000) x 0.2]
Last edited by Rmorgan&11; 01-19-2010 at 08:16 AM.
01-19-2010, 08:14 AM
#56
Racer
02-02-2010, 01:21 PM
#60
Race Director
