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Matt Shaff's Engine Shop / Re: Spark Plug indexing
« on: March 29, 2013, 05:19:28 AM »
Looks like my last post killed this thread. Dead!Dead! Dead!
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On the South West Junior Fuel Association website, Jon Hansen posted some interesting thoughts on engine temperature for Jr Fuel engines. The posting was a while back but you may want to go check that out. Sounds like you have a pretty honking 355 there George. What is your car weight?
I will have to index the plugs on my deal because I'm shooting for a max compression piston dome. But I would index anyway. Why not? If you don't do it, the guy in the next lane will. All it costs is some time.
George it may not be too rich . How hot are you getting it? and how much dose the temp increase durring a run?
George:
If you have no interference problems now, I doubt that indexing would provide any improvement.
In the old days when we ran stock 461 castings on a small block, we had to index.
It was typical to angle mill those heads .125" to .150".
This brought the spark plug right to the deck. I found that if you indexed 180* from the normal - meaning you
pointed the ground strap up, the combustion chamber could "see" the spark plug.
I believe your Dart heads have the spark plug slightly higher than the old Chevy castings and you dont have to cut them so much.
By the number posted in your personal box, your little small block hauls ass!
Tell us more about your combo. Whats it run in the quarter mile?
Matt
I want to. I have been window shopping some, looking at a new chassis and some older chassis. I can't do it this year but am hoping money will be there next year to start on a budget built. Thinking to start running a small block maybe like a 388 crate motor, until money allows for a better engine.
Ben