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post #1 of 13 (permalink) Old 02-25-05, 03:19 PM Thread Starter
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Ignition Timing

Just a quickie.....can I have some respones on where people set their ignition timing as a basic start....without the expense of dyno tuning, etc.
I realise it's not a simple and pointing at 6 deg & that's it....

thanks

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post #2 of 13 (permalink) Old 02-25-05, 03:34 PM
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Re: Ignition Timing

14 deg inital with 38deg total. Thats 14 on the balancer

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post #3 of 13 (permalink) Old 02-25-05, 05:13 PM
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Re: Ignition Timing

Quote:
Originally Posted by brenx
14 deg inital with 38deg total. Thats 14 on the balancer

Brenden
I dunno bout iron heads at those numbers but alloys easy. I just want some!

I run 32deg total in by 3000 on my 9-1 iron 2Vs and remember to take off the vac line to the dizz to set it.

Hey brenx hows the glide combo going?

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post #4 of 13 (permalink) Old 02-25-05, 06:51 PM
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Re: Ignition Timing

Slowly. I used to run the same timing with my 2V cast irons.

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post #5 of 13 (permalink) Old 02-25-05, 11:41 PM
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Re: Ignition Timing

10deg initial, 36deg total. Cast 2v's 4v valves. This is one of those personal preference questions.
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post #6 of 13 (permalink) Old 02-25-05, 11:47 PM
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Re: Ignition Timing

Cheers Brenx,

This is my first post. Have been reading for some time though.
Mechanic friends of mine have lot of bother running more than 6 deg. initial in modified engines now.

Do you run 14 deg. with 98 octane fuel or higher. Does the cam you run have a lot of overlap? They told me that engines with small overlap cams won't take a lot of initial advance.

Is this correct? Your car obviously goes hard so you must have sorted out fuel bothers.

Jock
p.s. I will be going through same situation with own car shortly. Thanks.
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post #7 of 13 (permalink) Old 02-26-05, 03:45 AM
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Re: Ignition Timing

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Originally Posted by jock
Cheers Brenx,

This is my first post. Have been reading for some time though.
Mechanic friends of mine have lot of bother running more than 6 deg. initial in modified engines now.

Do you run 14 deg. with 98 octane fuel or higher. Does the cam you run have a lot of overlap? They told me that engines with small overlap cams won't take a lot of initial advance.

Is this correct? Your car obviously goes hard so you must have sorted out fuel bothers.

Jock
p.s. I will be going through same situation with own car shortly. Thanks.
14 initial with premium (95) or 98 octane. with the cast irons. Cam's got 248@50. It's not what I call a massive or big cam. Still sorting issues to make it faster. Probably will always be sorting something. It's the nature of the beast (cars). With the alloys heads the ball game changed. I can now run 91 octane if need be but I still prefer not to.

Anything with around 230@50 upwards should be able to cope with 12-14 initial and 32->38 total running cast iron heads.

Brenden

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post #8 of 13 (permalink) Old 02-27-05, 02:12 AM
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Re: Ignition Timing

Quote:
Originally Posted by brenx
14 initial with premium (95) or 98 octane. with the cast irons. Cam's got 248@50. It's not what I call a massive or big cam. Still sorting issues to make it faster. Probably will always be sorting something. It's the nature of the beast (cars). With the alloys heads the ball game changed. I can now run 91 octane if need be but I still prefer not to.

Anything with around 230@50 upwards should be able to cope with 12-14 initial and 32->38 total running cast iron heads.

Brenden
For Jocks' benefit I am running AFD alloys with 11.4 : 1 compression and my dizzy has 20 deg mechanical advance only (no vacuum). Cam is 248 @ 50 and 605 lift and I only run 98 fuel

I can set it at up to 20 deg initial on the balancer - in fact the higher it is the happier it idles and it still pulls without pinging with 40 deg total,
BUT,
any more than 30 deg total and the power falls away.
So I have to set initial at 10 plus 20 in the dizzy = 30 total to make max power

Therefore, what brenx says doesn't hold true for my engine probably due to the high comp.

Ideally, I would like to have 20 initial and 30 total so dizzy needs to be regraphed with 10 deg mech adv

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post #9 of 13 (permalink) Old 02-27-05, 02:34 AM
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Re: Ignition Timing

As for mine 10.9:1 CR iron heads it likes 16 int and 20 mech totalling 36 no more
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post #10 of 13 (permalink) Old 02-27-05, 05:25 PM
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Re: Ignition Timing

20 initial and 36 total..

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