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914World.com _ 914World Garage _ carb timing

Posted by: ruddyboys Jun 20 2005, 12:27 PM

Reading an article on the bird board it says timing for a carbed engine should be 34 degrees @ 3200RPM? Is this right or should I stay with 27 degrees @3500RPM.

Posted by: ArtechnikA Jun 20 2005, 12:36 PM

"a" carbed engine ?

what *kind* of carbed engine?

i know of some for which that'd be too much, others for which it'd be too little.

cam? compression? octane rating?

Posted by: tat2dphreak Jun 20 2005, 12:41 PM

I *THINK* 34 is optimum, BUT IIRC, there is no way to acheive this without a Mallory dizzy, I think the 009 tops out at 28(or so) and the 050 stops at like 31...

my numbers may be a bit off, but you see the problem.

Posted by: Mueller Jun 20 2005, 12:50 PM

QUOTE (tat2dphreak @ Jun 20 2005, 11:41 AM)
I *THINK* 34 is optimum, BUT IIRC, there is no way to acheive this without a Mallory dizzy, I think the 009 tops out at 28(or so) and the 050 stops at like 31...

my numbers may be a bit off, but you see the problem.

huh???? a dizzy tops out at whatever spec you want it to depending on the base numbers...try it at 27° first, then move it up until you loose power or start to ping/heat up.

you can run 50° advance with a stock dizzy if you want, but it'll be hard to start the car

Posted by: tat2dphreak Jun 20 2005, 01:20 PM

QUOTE (Mueller @ Jun 20 2005, 01:50 PM)

QUOTE (tat2dphreak @ Jun 20 2005, 11:41 AM)
I *THINK* 34 is optimum, BUT IIRC, there is no way to acheive this without a Mallory dizzy, I think the 009 tops out at 28(or so) and the 050 stops at like 31...

my numbers may be a bit off, but you see the problem.

huh???? a dizzy tops out at whatever spec you want it to depending on the base numbers...try it at 27° first, then move it up until you loose power or start to ping/heat up.

you can run 50° advance with a stock dizzy if you want, but it'll be hard to start the car

maybe I misunderstood, but Jake was saying that peak advance on a 009 and 050 are quite lower than the advnce curve needed for carbs

I dunno... maybe the Jake will see this and rescue me on this one... and clarify?

Posted by: Mueller Jun 20 2005, 01:28 PM

you are correct in the "advance curve" might be less...

see these 2 examples:

if you set the dizzy to have 10° at idle and it swings 17° you have a total of 27°

now if you set it at 17° idle, you could get a max advance of 34°...the car will be harder to start at 17° static timing

Posted by: tat2dphreak Jun 20 2005, 01:40 PM

QUOTE (Mueller @ Jun 20 2005, 02:28 PM)
you are correct in the "advance curve" might be less...

see these 2 examples:

if you set the dizzy to have 10° at idle and it swings 17° you have a total of 27°

now if you set it at 17° idle, you could get a max advance of 34°...the car will be harder to start at 17° static timing

ok, I see, you were talking static timing and I was saying total advance...