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Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: MonzaJPD61 ()
Date: May 19, 2017 06:43PM

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?

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: MattNall ()
Date: May 19, 2017 06:50PM

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?





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

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: MonzaJPD61 ()
Date: May 19, 2017 07:30PM

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

Hence my post

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: MattNall ()
Date: May 19, 2017 07:33PM

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





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

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: Wagon Master ()
Date: May 20, 2017 06:26AM

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

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: TomW ()
Date: May 20, 2017 09:12AM

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.

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: MattNall ()
Date: May 20, 2017 09:37AM

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!





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.

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: MonzaJPD61 ()
Date: May 20, 2017 10:40AM

Thanks for the comments everyone

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: MonzaJPD61 ()
Date: May 20, 2017 05:49PM

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

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: TomW ()
Date: May 20, 2017 06:25PM

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 . . . .

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Re: Ignition Timing - 61 Super Turbo Air 98 HP
Posted by: kmart356 ()
Date: May 21, 2017 07:09AM

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.

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