How To Build The Perfect Bracket Engine For A Classic Chevy
-Alan Arnell
One of my day dreams is to build a Tri-Five Chevy Bracket Race Car. As a first bracket racer, I would choose the small block Chevy engine. What I ponder is what would be the best compression ration for my combination? What type of fuel would be necessary? Depending on the size of the combustion chamber, deck height and gasket thickness what type of piston compression ratio should I use, as my choices, as I believe, is 8.8 to 10.5:1. What would be the best combination? What are the general guideline or rules of thumb based 10.5:1 on camshaft overlap or some other factors?
This is what I found suggested for just what I am look for in a bracket race motor:
When choosing compression ratio, you can never have enough. That said, you want to run as much compression as you combination will tolerate. The higher compression ratios, you are able to extract more heat (power) out of given amount of fuel. The combustion efficiency goes up and with that comes the power. The rule of thumb based on overlap is don’t run a RV-type camshaft with 12.5:1 compression. The engine would be detonation-limited. As for combustion it is recommended to go with the most compression you can build with you components. Assuming that you are going to run a camshaft in the 220-240 duration range at 0.050-inch lift. This will work well with a 10.5:1 compression.
As for fuel it was suggested to start with 92-octane gas with a conservative amount of spark advance (28 degrees total). Keep advancing the spark and stop when detonation.is present to tune your engine.
A great combination could be a 350 ci small-block engine at 9.0:1, with dart 220 heads and a flat-topped camshaft that would have the potential to produce 500 hp on 92-octane fuel. Wit a Tri- Five ‘57 Chevy the ET / MPH computed from your vehicle weight of 3800 pounds and HP of 500 is 11.45 seconds and MPH of 118.01 MPH. That would be perfect for my first truly purpose built bracket racer. With a Turbo 400 and 4.10:1 rear gears I bet I would be a force to reckoned with on the ¼ mile local tracks if the ⅛ mile tracks as well!
A LINK to a ET-MPH Calculator
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