>The stock centrifugal-only Lucas in 67 1275s is set to 22° @ 1200 rpm and
>the centrifugal advance increases the advance from there. I used to have
>the Robert Bently book that gave total advance for the different
>distributors, but sadly I've lost it somewhere.
This is what mine (Bentley) has to say about advance degrees for Lucas 23D4
"Centrifugal only distributors".
0*-3* @ 600 rpm
6*-12* @ 1,000 rpm
11*-15* @ 2,000 rpm
22*-26* @ 5,200 rpm
28*-32* @ 7,000 rpm
I hope this helps.
dfox
>At 10:58 AM 3/29/98 -0500, you wrote:
>Ric,
>
>>I am using and Aldon Rally (I think) distributor. It appears to have
>>about 20 degrees of mechanical advance coming in by about 3500 RPM.
>>
>>I am trying to figure out where it needs to be for best power.
>>
>>Currently I have it set so at 1000 rpm it is at about 5 degrees BTDC.
>
>The stock centrifugal-only Lucas in 67 1275s is set to 22° @ 1200 rpm and
>the centrifugal advance increases the advance from there. I used to have
>the Robert Bently book that gave total advance for the different
>distributors, but sadly I've lost it somewhere. I suspect the total
>advance with the stock Lucas distributor is supposed to be much higher than
>the 5 + 20 = 25° total advance you are stating you have.
>
>If I was going to approach this problem myself, I would find out the
>centrifugal advance for the stock centrif-only Lucas and add this to the
>22° base and subtract a few degrees (for the timing spec being at an rpm
>where the centrifugal advance has already started to work). Then adjust
>the aftermarket distributor to this number (at an rpm where the advance is
>maxed). That should get it in the ball park as long as the advance curve
>is proper. It's trial and error after that.
>
>That's what I hate about aftermarket distributors. You'll never know for
>sure.
>
>Good luck,
>
>Les
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