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Post by flipflopoo1oo on Mar 26, 2014 20:39:17 GMT -6
After using a vacuum advance and only the best spring controlled weights to aid in hooking up with less horses for a few feet in order to be able to floor the car while sideways and it moving, I addressed the potential of hotter fire and more fuel! While burning twice the fuel that most use all night just in a 20 lap race with the plugs still snow white, I figured out that hotter fire allows for a boost in horses if you can put enough fuel in to match! Sure we wasted a few parts getting to that point but the horses was out of the gate! You can't turn back after being hooked and everyone is looking for the Nitrous on the car! Intakes were pulled! Fuels were sent off for testing! Tachs were disconnected! A stock GM module and coil with a tan cap and rotor that puts out more than you can believe! More than we could buy! A 10 degrees block on both vacuum and weights giving a 20 degrees advance total was used! Bench testing on 12 volts it would jump from pin to pin with out any plug wires on the cap easily! Test yours and it most likely just clicks inside or jumps to ground at the coil! Getting it to the plugs does require a good set of tan parts and wires to say the least! A Rocket 350 GM OLDS coil from a early year with a .080 plug gap was used! Jets must be changed before hot lapping and a constant check on the wet oil of at-least 3 threads on number 3 cylinder to keep from going lean and melting plugs, head gaskets or burning the block and heads in three laps! Proceed with caution as not to be shocked or trampled in the process of these extra horses! Set the timing with the engine at 5,000 rpms without vacuum hooked up! Be sure to use a live vacuum port or it will not fall back to the weights while on the throttle! I run no power valve in my carbs ( blocked and up 5 jet sizes more, 83-86s on a two barrel) and a cool 150 degrees engine temps to allow more air to flow as well! Work your way up on timing and fuel to get more horses with the extra fire power! No racing fuel used, just 93 pump gas! Hope you find more than you expected and then some!
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Post by Krooser on Mar 27, 2014 23:00:46 GMT -6
So you are saying use vacuum advance with a total advance of 20 degrees?
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Post by flipflopoo1oo on Mar 28, 2014 8:33:14 GMT -6
Nope just 10 degrees and 10 with the weights! They sell adjustable ones as well as a number of different options of stock ones with different springs to work at different amounts of vacuum! A quick spot welded stop will work if cooled quickly! Half the travel is close as most stock ones have a 20 degree range! A machined Allen screw if half is ground off the top will work with a lock washer and thin nut will fit to limit the weights in the hole under the cap! Notching the cap may be required and even a flat side ground to get 6-10 deg. weight advance! The springs weights and vacuum amounts can be tuned to the change per RPMs desired in the shop! Vacuum is live but lost when throttle is open lowering the timing and horses, as the RPMs comes up in a few car lengths you have the horses back and the car has picked up enough speed as not to loose traction to handle more horses! Having no power valve to cut the fuel back with vacuum gained at high RPMs or when lifting it pulls more fuel into the engine to cool off the pistons that were just a bit lean for 3 seconds giving quite a boost with the extra timing applied as not to over fuel the engine but not too crisp for acceleration! You have to read the number of wet oily threads on number three plug to see if correct! A top lube is recommended to help from leaning out! It is tricky but the horses used and gained will give you a boost in corner speed, higher revs with out getting tight, and better drive down the straights and the last few seconds is like nitrous! It is a full package if you can grasp this! Do not do one part only as to ruining a engine! More fuel will be needed at the jets! Check out my HEI post to go with this! Don't be limited by timing as you now crank at 28 degrees, you can bump it on up with enough fuel to 57 degrees as long as it cranks good! It takes a bit more time to get this much fuel to start burning correctly and be still in time at 38 degrees burn timing! A new, hotter, and longer burn adds a boost! This works best with lower compression! Check out ways to better cool for more air flow to go with the extra fuel! Ask anything about this until we get it done! Baby steps are fine as to saving a engine and A/C plugs a must as to melt and miss first!
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