Timing drives me crazy.....

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    Author Topic: Timing drives me crazy.....  (Read 5104 times)

    Offline brasil

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    Re: Timing drives me crazy.....
    « Reply #30 on: July 06, 2016 - 03:11:02 PM »
    I limited  the advance,,,down to 10 deg...   but 10 deg is still too much...  and less ? Does it make sence to look for
    2-4 deg.?? Don´t know...but I think it is a waste of time...

    I think the CR is too high....Unfortunatly...I don´t konw...what they did with engine..when they rebuild the engine...in North Carolina..  ( perhaps they wanted to make a real Richard Petty Racer out of him ?? )
    Flat Top pistons...  milled X Heads... HP Manifolds  71 Intake...  more than 180 PSI comression on each Cylinder...
    unknown cam...  that need a huge number of timing @ idle...  and a carb that needs to be "upjetted" from 095 /1940
    to 098 /1966 ....

    if there were some signs of dripping oil...or something    I had a reason to pull the heads and the cam  just for knowing....  what `s going on....

    Greetings Juergen
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    Offline Strawdawg

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    Re: Timing drives me crazy.....
    « Reply #31 on: July 06, 2016 - 03:31:56 PM »
    well, 5 degs is better than 0 degs, :D  but who knows if it will work-have to try it and see....or go up a notch on the cruise fuel.

    sometimes, more can be better :)  I have found that many cars of this generation cruise best around 13.5-1 because fuel distribution is not as even as with port injection.  All it takes is one lean cylinder to get a little rattle.

    I don't recall what you said about AF so you may be there already
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    Offline brasil

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    Re: Timing drives me crazy.....
    « Reply #32 on: July 06, 2016 - 05:23:13 PM »
    Thank you strawdawg...

    i will go up  with the Fuel ratio tomorrow...  and then hook up the VC again...   who knows..? the Idea is right..
    I will keep you informed ..about the progress

    Greetings Juergen
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    Offline 734406pk

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    Re: Timing drives me crazy.....
    « Reply #33 on: July 07, 2016 - 09:30:22 PM »
    Quote from: brasil on July 06, 2016 - 03:11:02 PM
    I limited  the advance,,,down to 10 deg...   but 10 deg is still too much...  and less ? Does it make sence to look for
    2-4 deg.?? Don´t know...but I think it is a waste of time...

    I think the CR is too high....Unfortunatly...I don´t konw...what they did with engine..when they rebuild the engine...in North Carolina..  ( perhaps they wanted to make a real Richard Petty Racer out of him ?? )
    Flat Top pistons...  milled X Heads... HP Manifolds  71 Intake...  more than 180 PSI comression on each Cylinder...
    unknown cam...  that need a huge number of timing @ idle...  and a carb that needs to be "upjetted" from 095 /1940
    to 098 /1966 ....

    if there were some signs of dripping oil...or something    I had a reason to pull the heads and the cam  just for knowing....  what `s going on....

    Greetings Juergen

    You may need to eliminate vacuum advance altogether if you have pinging at cruise. Most high compression engines use centrifugal only, 36 or so degrees all in... Can you get fuel with a higher octane rating or use an additive to increase the same?
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    1973 Challenger 440 6 pack auto 3.91 rear
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    1995 Kawasaki ZX1100E & still alive

    Offline cudabob496

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    Re: Timing drives me crazy.....
    « Reply #34 on: July 08, 2016 - 12:44:03 AM »
    I ditched my vac advance. Gave better throttle response.
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    72 Cuda, owned 25 years. 496, with ported Stage VI heads, .625 in solid roller, 254/258 at .050, 3500 stall, 3.91 rear. 850 Holley DP, Reverse manual valve body.

    1999 Trans Am, LS1, heads, cam, headers, stall, etc! Love to surprise the rice rockets with this one. They seem so confident, then it's "what the heck just happened?"

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    Offline brasil

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    Re: Timing drives me crazy.....
    « Reply #35 on: July 09, 2016 - 05:27:04 PM »
     :working:

    Result.....   No more pinging  :ylsuper:

    What did I do ??...   I just slowed down the Timing Curve...  and changed the advance... @ Idle I have now 10 deg BTDC..24 deg advance ...  and....  14 deg from the VC....   
    AFR while cruising....14.5   WOT 11.8     Idle  around 13....

    Thank you all for your advises and help !!

    Greetinge Juergen
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    Offline Strawdawg

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    Re: Timing drives me crazy.....
    « Reply #36 on: July 09, 2016 - 10:12:07 PM »
    Good news  :jumping:
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