Roll call factory class boats
07-30-2015 | 11:39 AM
#61
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The Illustrious One
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From: Internationally Famous
07-30-2015 | 12:02 PM
#62
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From: bel air, md
07-30-2015 | 12:31 PM
#63
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From: Fort Lauderdale, Florida
DISPLACEMENT: *Maximum 510 CID, with a 4” stroke crankshaft only.* Crankshaft throws must be in accordance * with OEM specifications.
COMPRESSION RATIO: Maximum compression ratio of 9.0:1.*
CAM: *Any hydraulic roller cam *with *a *maximum intake lift of .610 inch and exhaust lift of .632 inch measured at the valve with zero lash is the only cam allowed, with an OEM stock gear timing chain, no belt driven timing chain systems are allowed.* Variable cam timing not allowed. * * **
BLOCK: Chevrolet designed blocks, with their OEM specifications, NO MODIFICATIONS, manufactured by *General Motors, World Products and Dart must be approved by Stinson **
MATERIALS: *Crankshaft, Flywheel, connecting rods, pushrods, and wrist pins must be made of steel, Titanium or other materials are not allowed
HEADS: The approved cylinder head is the Dart Pro I Head, Part Number*19100010*M (bare head) or 19100112M (complete head with valves and springs) with their stock OEM specifications, no modifications allowed. 1.7 ratio rocker arms on stud mounted rocker arm shafts only. The head serial numbers must remain on the head and may not be defaced or altered.* The Stock Mercury 525 OEM Head with it’s OEM specifications and no modifications may be used. **
INTAKE MANIFOLD: Any stock cast intake manifold with a Holly Carburetor 4150 style (size) base may be used. No fabricated or tunnel ram type manifolds may be used. Intakes may be port matched up to 1 ½ inches to match cylinder heads. Carburetor spacers or adapters are NOT ALLOWED.
INDUCTION SYSTEM: *One Holley carburetor 4150 style(size) only is allowed.* Naturally aspirated only, no forced induction allowed.
LUBRICATION (ENGINE): *External oil pumps or dry sump systems are not allowed. * * * **
IGNITION SYSTEM: *Engines are required to use the MSD Digital or Analog Ignition system limited to 5800 RPMs. Crank triggers and belt drive ignitions are not allowed.
ENGINES ARE REQUIRED TO HAVE THE IGNITION SYSTEM LIMITED TO 5800 RPMS AND HAVE A G2X DATA LOGGER INSTALLED and maintained to Monitor the RPM level during the race.* The RPM level during the entire race must be verifiable on the Data Logger*
Thoughts
COMPRESSION RATIO: Maximum compression ratio of 9.0:1.*
CAM: *Any hydraulic roller cam *with *a *maximum intake lift of .610 inch and exhaust lift of .632 inch measured at the valve with zero lash is the only cam allowed, with an OEM stock gear timing chain, no belt driven timing chain systems are allowed.* Variable cam timing not allowed. * * **
BLOCK: Chevrolet designed blocks, with their OEM specifications, NO MODIFICATIONS, manufactured by *General Motors, World Products and Dart must be approved by Stinson **
MATERIALS: *Crankshaft, Flywheel, connecting rods, pushrods, and wrist pins must be made of steel, Titanium or other materials are not allowed
HEADS: The approved cylinder head is the Dart Pro I Head, Part Number*19100010*M (bare head) or 19100112M (complete head with valves and springs) with their stock OEM specifications, no modifications allowed. 1.7 ratio rocker arms on stud mounted rocker arm shafts only. The head serial numbers must remain on the head and may not be defaced or altered.* The Stock Mercury 525 OEM Head with it’s OEM specifications and no modifications may be used. **
INTAKE MANIFOLD: Any stock cast intake manifold with a Holly Carburetor 4150 style (size) base may be used. No fabricated or tunnel ram type manifolds may be used. Intakes may be port matched up to 1 ½ inches to match cylinder heads. Carburetor spacers or adapters are NOT ALLOWED.
INDUCTION SYSTEM: *One Holley carburetor 4150 style(size) only is allowed.* Naturally aspirated only, no forced induction allowed.
LUBRICATION (ENGINE): *External oil pumps or dry sump systems are not allowed. * * * **
IGNITION SYSTEM: *Engines are required to use the MSD Digital or Analog Ignition system limited to 5800 RPMs. Crank triggers and belt drive ignitions are not allowed.
ENGINES ARE REQUIRED TO HAVE THE IGNITION SYSTEM LIMITED TO 5800 RPMS AND HAVE A G2X DATA LOGGER INSTALLED and maintained to Monitor the RPM level during the race.* The RPM level during the entire race must be verifiable on the Data Logger*
Thoughts
07-30-2015 | 12:45 PM
#65
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From: bel air, md
So the Sbi motor. Started putting together the parts to build one for the super vee. Then it got interesting. This is what came up. Ned a cam with .610/.632 lift measured at the valve. Answer, really who's gonna be able to measure that at the retainer with a hydraulic lifter. Ohhhh, nobody. Want some smaller journals on the cam for less friction to make more power. Sure why not. How much? Depends, can build two motors to that spec. One will make about 50 hp more than the other. One is cheap, one won't be cheap. Those there rules need to be amended quickly. What was explained to me was that there's a whole Lotta holes I'm those specs. How much do you wanna spend.
07-30-2015 | 12:54 PM
#66
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From: Fort Lauderdale, Florida
Yup, started a conversation with my engine builder at 60 percent battery on my phone. He hadn't even got close to finishing what combination he would throw in that motor and my phone needed the charger plugged in. It was an interesting afternoon. And all within spec.
07-30-2015 | 01:01 PM
#67
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From: bel air, md
Yup, started a conversation with my engine builder at 60 percent battery on my phone. He hadn't even got close to finishing what combination he would throw in that motor and my phone needed the charger plugged in. It was an interesting afternoon. And all within spec.
07-30-2015 | 06:26 PM
#68
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From: Wenham, Ma
Assuming one would have stock heads , no more than 32 timing and pump gas I doubt anyone will get huge differences . With a carb , that is . You still need the boat to go fast and to do that it has to stay together.I would say there should be a drive rule. No super duty Imco or others. The drive in my opinion is the big equalizer. The more juice you put through it , the more it scatters .
Last edited by bwd; 07-30-2015 at 06:29 PM.
07-30-2015 | 06:30 PM
#69
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From: Florida
Being that it's a spec class there should also be a parity rule. If someone spends all the big money building a motor for no reason the inspectors can mandate les rpm or a restrictor plate and all that time and money was wasted. I think Sean's like idea is to build engines for competitive racing at an inexpensive price the goal is to save money not spend 40,000 on a motor
07-30-2015 | 06:47 PM
#70
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From: Wenham, Ma
Being that it's a spec class there should also be a parity rule. If someone spends all the big money building a motor for no reason the inspectors can mandate les rpm or a restrictor plate and all that time and money was wasted. I think Sean's like idea is to build engines for competitive racing at an inexpensive price the goal is to save money not spend 40,000 on a motor
