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kyle7713

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Posts posted by kyle7713

  1. Posted · Report reply

    Max, you're misunderstanding how vac advance works. You can't replace it with centrifugal and, the way it works when connected to manifold vac is exactly what your engine wants.

    Yes, fuel pressure can have an effect as well, but it isn't huge.

     

    Danno, the reason the 351W heads may not help is because the might have larger chambers, which would lower compression a bit, and more compression is better for fuel economy. You mentioned that the engine has been rebuilt- do you know what pistons were used ? Some of the replacement pistons have a shorter pin height and thus lower the compression- which hurts power and economy. Your engine may also have been built with the wrong timing chain set. Back in the early 70s the OEMs were trying to reduce HC emissions at idle, so they made new timing sets that had the camshaft retarded 4-6 degrees, which burned lots of extra fuel and cost power and economy. They also had ported vac advance, which is also a mistake to use. manifold just plain works better.

     

    You can look at the sparkplugs and see if the mixture is too rich or not. LSG

     

     

     

    Great info!

     

    I heard about the timing chains being off off a little after i built my engine, especially true with the double roller chains. Might be able to free up some horses and not hurt my fuel economy.

     

    Plug reading is a HUGE HELP, that what i used to turning my car.

     

    Here is the site i used http://www.4secondsflat.com/Spark_plug_reading.html

  2. Posted · Report reply

    Hooking up vacuum advance to manifold is defeating the purpose of vacuum advance. It gives you full advance at idle, you might as well just do that centrifugally. Also, if you have a big cam and an automatic, it pulls out timing when you put the car in gear, and that is the opposite of what you want.

     

    i know its not how you normally should hook it up but for my case it works and works well

  5. Posted · Report reply

    I have always wondered about the timing with my 302. You said you had custom grond weights, what were they adjusted for? A certain advance at a certain speed?

     

    yes i ground the center section of the weights to allow for more or less total timing (every engine reacts a little differently) and have timing come it smoothly till maxing out at 2800 rpm, i offset my high initial timing and total timing set up with the greatest vacuum advance sweep i could get to prevent knocking while giving great cruising efficiency. ooo the many many long night i spent researching combustion and thermodynamic theories to figure this stuff out

  6. Posted · Report reply

    I'm building my car with the same engine and trans and would love to know what you did to get that. 2 thumbs up. :tt1:

     

    Sorry for not answering i was slammed with finals. I have a HEI distributor that took a long time to set up just right with custom ground weights, 195 thermostat, edolbrock 1406 carb yjats been internally polished/deburred and tuned by the plugs/feel in 1000 rpm increments, performer intake, fmx has shift kit hooked up to a very tight tq converter.

     

    lots of trial and error on this on, since in my daily driver i have had plenty of time to play with it lol still chirps the tires shifting into 2nd

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