How To Fix Your Brand-New Ke Motorsport Electronic Distributor

[Twinky]

Those internals almost look exactly the same as the points type 5k dizzy.

[snot35]

Legendary work altezza, as always. I'm sure I'll refer to this as I sort my electronic dizzy.

[Oh-KE]

Very interesting... So do you think this lack of advance would also be happening in standard points type dizzys? Because i went to test my vac advance the other day and it worked when I sucked on it but I had to suck pretty damn hard to get it to move... maybe if i gave the springs a little tweak it would help??

 

Great write up...

 

Cheers

[altezzaclub]

but I had to suck pretty damn hard to get it to move

 

I've wondered about that, but I think its pretty normal. Most cars have 20"mercury on the manifold vac, but with a hot cam, SUs and small tappet gaps mine is only 10-12 at idle. So I think a stock setup on ported vac probably gets more vac advance at cruise throttle. I found the car needed more advance than 8deg when it was stock to really make it work, and the stock curve seems very flat compared to other cars. Maybe its all to do with emission control stuff.

 

Yeah, someone should try changing the springs in a stock Bosch setup and see if it improves it. The vac advance only exists when you have a throttle closed or close to that, so all acceleration is done on the mechanical curve only.

[GJM85]

I did actualy read this thread last night and decided to pull the dizzy back out.

Just to recap I removed the original heavy springs and swapped them with the 3k springs which felt far lighter. As Altezza may have discovered it caused the mechanical advance to max out to early and rpm gain becomes flat.

After reading this thread

I put one of the stronger springs back in and kept the spring with the elongated eye from the 3k dizzy. Now its like a 2 stage advance where early in you get a fast increase with the lightly sprung weight whilst the heavier spring prevents the weights from maxing out and gives a steadier increase in the top end.

[altezzaclub]

Well, if you have a flash timing light where you turn a dial to put the timing mark on TDC then read the advance off the dial, its very easy to generate an advance curve every 500rpm.

 

I wonder how many people are missing out on their best performance because their motor is running a slow curve.

[GJM85]

My old stewart warner tacho kicked the bucket the other day and needs to see a doctor so graphing the curve isnt going to be easy at the moment. Have you seen how much even a shit tacho is lately?

[orangeLJ]

For anyone who isn't too keen on messing around with springs and bob weights (I'm one of those silly enough to play with them myself haha, holden dizzies are a pain in the bum!)

 

http://www.performanceignition.com.au/home

 

Scorcher distributors do custom curved, standard style dizzys for a range of cars.

 

You send them your engine specs, revs etc etc and they curve the dizzy to suit your needs.

 

Costs a little more than doing it yourself (obviously) but is handy for those not willing or able to tackle DIY