Thread: Bbc hp est
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Old 10-03-2012, 04:34 AM
  #28  
roadkill2
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RACING JUNKIE
 
Join Date: Jan 2012
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Originally Posted by ejm
first pull on this motor not really wanting to turn more than7500 but it pulled it all the way down at the end
Based on what I know about "Truck Pulling", which is almost exactly nothing, I'm gonna say you're pretty close to doing what you wanted to do . . Based on the video and the quoted post. Looks like tuning is what you're after . .

On the timing thing. Locking out your mechanical advance and running a set timing number is to maintain a specific ignition tme when you narrow the power band and run the engine within a specific parameter . . If you need a specific timing curve, again, I'd recommend a MSD 735A (If I remember the model number correctly) where you can adjust your timing curves up and down during a run . . and they're exact.

If your EGT is above about 1250, y'might fatten it up a little and definitely, if you choose to bump the timing you should fatten it up. (Advance leans the engine out)

On the glowing headers . . back in the day, if you had a Fuel car with Zoomies, when the glow was down to where the curl started, it was "just Right", as the baby bear said . . . any farther out and you were either heating the engine too long or it was too lean . . . What's your engine temp when you get to the end of the run?

Dunno about leaving harder. I've found with our car, we can leave a lot softer (4750plus/minus) and get really hard leaves that're a lot easier on drive lines than the old 5500 rpm launches. And we "Throttle into" the launch rather than hammer the driveline and tires . . (1.35 60' times) and we use all the tire with no spin, even on late day or greasy track conditions . . But we're drag racing, not pulling . . There's a difference, I'm sure . .

And we're still 'spearmintin' so I'm certainly not the last word . .
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