Pontiac - Street No question too basic here!

          
 
 
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Old 11-22-2020, 10:38 PM
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73LeMans 73LeMans is offline
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Join Date: Mar 2002
Location: Berkley, MA
Posts: 893
Default Crank trigger on the street?

Street? Race? Not sure where the line is any more..... Maybe wrong section, but here goes -

Looking to run a crank trigger on my 463 and wondering if the risk outweighs the reward. Curious your thoughts.

The reason this is raised here is this this combination will see mostly street miles - track maybe 2x year.

12.5:1 C.R.
KRE Dports by Dave @ SD - 335int/230exh
Solid Roller - Duration @.050 is 272/280 degrees
TH400 - 4.10 gears
3800 stall converter


Here are the drawbacks I can see
- Hard start
- MPG
- Detonation potential

Starting -Since I'm cranking the engine first and adding power to the ignition after, I no longer consider starting to be a concern.

MPG - The mileage may suffer because I'm not optimizing my timing curve below 3000 rpm, but I don't think I'll see any measurable difference. With 4.10s, 3800 stall converter and an advance curve, I barely saw 8 mpg running 20 degrees initial and 29 total all in by 3000rpm. Can it get much worse being only a 9 degree difference?

Detonation - This is the big question and I'm wondering how concerned I should be. I have no timing control devices. I'll have 29 degrees of advance all the time. My cooling system is up to the task, but I'm afraid I wont be able to detect detonation because I can barely hear conversations, much less pinging over the exhaust of that car.

Thoughts?

__________________
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Mark S
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Who needs nice and pretty, when you can have mean and nasty?
KRE Aluminum headed 463CID 73 LeMans. Used to run 10.6x @ 124.55. 3700lbs
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So much for 2020...shootin for 9s in 2021...and in 2022 apparently.....and 2023....and 2024.....and 2025.....who am I kidding? there will be no 9s with this engine!
>>My 73 Build thread
 


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