Spec. is 13 deg BTDC, runs well at ~18 deg BTDC, which is at the edge of the graduated scale. Seems high too me, but runs better the more I advance it; thus far. Have not advanced further...experience...advice?

1 Are you running 90 octane plus fuel?

2 how good are your ears? Can you hear "Ping" Do you know what pinging sounds like?

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MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

1 No
2 Hearing is fine, I know what pinging is, what causes it and what it sounds like

Hence my post

Then run it...say at 16!! Error on the safe side!! ggg

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MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo

I advance mine to where it will just barely ping on the lowest grade gas I can find, under the worst conditions. Then I run mid grade. Only use my timing light on the run-in test stand.

'64 Monza Coupe 140 4 speed
'61 700 Lakewood 95 4 speed
'69 Monza Convert. 140 Auto.

Been aircooled since 1973
Northwest Ohio

My 1962 Monza 102/4 (similar Engine) also "likes" more advanced timing than the stock 13 degrees. It runs "OK" at 13 degrees, but much better at 17-18 degrees.
However, I always run 93-Octane Sunoco.

I'd suggest running 93-Octane gas, advance timing to run good and listen carefully for pinging.

And please Remember....the Human ear cannot hear "light pinging" which just takes longer to do damage...

I recurve my distributor's mechanical advance...

1 so I can set initial at 12-14 BTDC at idle...this allows a low rpm smooth idle and easy starts.

I then run mechanical advance starting at 800-900 rpm to to add 20-22 deg. Crank advance by 2400 rpm. [ 10-11 distributor ]

I dimple the end of the VA cannister to keep VA from pulling in below 12 inches hG. This way it only works at highway cruise normally.

If you have a Tach... you'll see 90% of driving is between 2000 - 3000 rpm!

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MODERATOR
Sea Mountain, between Charleston Harbor and Coos Bay! SW Oregon Coast
Click HERE for My Website...Click HERE for My TechPages!
..............................110-PG.................................................Webered-Turbo




Edited 1 time(s). Last edit at 05/20/2017 09:40AM by MattNall.

Thanks for the comments everyone

Going from 51 to 52 jets may have helped avoid detonation (pre-ignition pinging) too.

Assuming you're running the "new" 10% Ethanol/Gas, I recommend you:

1. Lower your Carb Float Setting
("new" gas is lower density than the "old/1960s" gas and can cause flooding)
and
2. Increase the Choke Vacuum Break opening
("new" gas makes it start rich so you need more air).

Just my $0.02 of experience with my 1962 102HP . . . .

MonzaJPD61 Wrote:
-------------------------------------------------------
> Going from 51 to 52 jets may have helped avoid detonation (pre-ignition pinging) too.

Also running 52 jets in the '63 Monza 102hp. 14* BTDC and no knock so far in 97deg FL sunshine.