Quote:
Originally Posted by SeventyOne
Why do you say the Black springs are too light? To me that curve seems to be what you need for a stockish build. You'd have 16 initial timing and ~20 mechanical advance. Depending on what RPM this maxes out at (hopefully you get around 36* at 3000rpm.)
If you get pinging drop your initial timing to 14 and total advance will be 34. You can also mix/match the springs. IE one black and one silver to get somewhere in the middle between the two curves.
Lastly I'd hook your distributor up to full manifold vacuum. It will help immensely with the sluggishness you are experiencing and the engine will run cooler. Not to mention you can lower the initial to help with starting but still get the advanced timing right away to be more in the right torque range.
You may need an adjustable vacuum canister to dial in how much max timing the vacuum can adds at cruise. Run as much timing as you can during cruise without inducing pinging.
One more thing. I ran a Progression Ignition HEI for awhile and it was super awesome to be able to set my own timing tables from my phone (connected with bluetooth) without having to mess with any springs or weights at all. It's pricier that a standard HEI unit but so worth it.
https://progressionignition.com/ |
Thanks for the reply and info. The black springs were coming in at 900 RPM, below the idle RPM I had set at the time and I could only get 12 degrees mechanical at 2200 RPM, not 20 as shown on the chart. Maybe the black/silver combo will get me more at a little higher RPM since I’ve since reduced idle to 850, but it doesn’t seem like enough.
I’ve read a lot of debate on ported versus manifold vacuum. I know by going to manifold I could reduce initial, but wouldn’t that defeat my quest for more total?
The Progression looks like a nice unit and would no doubt be fun to play with. However I’d rather not spend hundreds on a distributor right now and besides, I’m having too much fun learning and playing with the old-school analog one I already have.
Thanks again.
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