14 replies to this topic

[darkcat]

Morning all

I'm just trying to set up the ignition timing on a 1380, and need to get a baseline static timing curve. 

 

In the form:
 

Idle (1000rpm) - 8 deg BTDC

.....

.....

max advance at? and how much?

 

 

or a graph... any format really!!

 

[KernowCooper]

Faqs curves for the Aldon yellow and Red, max advance used to be 34degs but depending on CR and fuel could be as low as 28degs

[Spider]

Hmmm sorry, maybe I'm being picky (and should shut up?) but static is stationary and to get a curve it has to move (or spin). Sorry, I don't mean to be-little at all, just get the terminology squared away!

 

Ideally, to sort what characteristics - curve - the dissy should have to suit your engine, it really needs a dyno session as the engine is no longer standard, so we can look it up in a book.

 

You could do as KC (above) suggest, it will work OK, but you may not get the best possible from your 1380.

[jaydee]

I think he means the baseline curve with no vacuum advance

That is (in a standard non leccy dizzy) called mechanical advance curve

 

by the way Static timing is a different thing, and by static timing you usually refer to a way of setting timing

[Spider]

It maybe helpful to also read this FAQ

 

http://www.theminifo...d-distributors/

[darkcat]

Yes what im after is the baseline timing with no vac.

Sorry to the terminology police!

[carbon]

Need a lot more info before even making the wildest guess:

- CR

- cam

- other modifications

- fuel octane

 

As Kernow Cooper says the total advance for normally aspirated could be anywhere between 28 and 34 degrees, depending on cam, CR, and fuel octane.

[timmy850]

I've got a "dial back" timing light which means you only need the TDC line on the flywheel.

 

If you want 30 degrees advance at 4000 rpm you set the timing light to 30 degrees and hold the engine at 4000rpm and then line up the timing marks. 

 

You could also use this to hold the engine at various revs (1000, 2000, 3000, 4000) and record the advance to work out the mechanical advance curve. Normally it's all advanced by 4000rpm.

 

Alternatively you can buy a Accuspark Blackbox and disable the mechanical advance, and have it all programmed by the unit.

http://www.accuspark...uk/Blackbox.htm

 

There is an Aussie thread on them here

http://www.ausmini.c...php?f=2&t=83483

Edited by timmy850, 08 July 2015 - 12:58 AM.

[darkcat]

Timmy, I'm going to have to assume you didnt read or understand the question, I am already running programmable ignition, and am looking for a baseline curve to program into it. 

As for spec:
1380, ported standard head, kent 276 cam, CR assumed approx 10:1, 

[Spider]

 I am already running programmable ignition, and am looking for a baseline curve to program into it. 

As for spec:
1380, ported standard head, kent 276 cam, CR assumed approx 10:1, 

 

Sorry mate, but in all fairness, I don't think any of us knew that.

 

In that case, here's a post from Dave in FAQ on the Aldons. I'd suggest (as Dave did in another way) kicking off with something along the lines of the Yellow.

[darkcat]

True, i didnt actually mention that, probably should have, but still a vague curve is all im after

 

[Spider]

Bhahaha,,,, sorry, I forgot the link in my last - DOH!!

 

http://www.theminifo...advance-curves/

[Ethel]

See if you can google up some megajolt maps.

[Mini Manannán]

 

 

There is an Aussie thread on them here

http://www.ausmini.c...php?f=2&t=83483

 

A mighty fine read there Timmy, almost all way over my head mind

[carbon]

Timmy, I'm going to have to assume you didnt read or understand the question, I am already running programmable ignition, and am looking for a baseline curve to program into it. 

As for spec:
1380, ported standard head, kent 276 cam, CR assumed approx 10:1, 

 

Fuel octane?

 

Would be wary about assuming CR, and have you run a compression test?