Dizzy Curves

[Anonymous]

In looking for a distributer for a US250/2502V engine I'm piecing together, I have seen plenty of eye candy and have no doubt I can find a nice billet electronic distributor and super duper coil with ten billion amps, but I haven't seen or heard anyone talk about their magic in regards to the advance curve. If I had a good distributor and took it to a dizzy guy and asked him to curve it. What figures would I give him? What's the hot ticket in Austrailia? Anyone out there with a distributor machine play with their dizzies?

 

[addo]

Many people here don't do much at all with ignitions. The Bosch electronic unit is pretty good and off a 250 the full advance comes in fairly quick anyhow.

Best bet is to model your engine on EA or DD programs. Note your shift point RPM; that's when you need full advance in by. I'd suggest you knock a couple of degrees off the recommended timing at this point unless you've got really good parameters for your head. A tiny controlled leak is also one way to reduce vacuum advance - if required.

Regards, Adam.

 

[Anonymous]

That's pretty wierd. I guess with all the new electronic ignitions and computer controlled spark and fuel systems, it's not as big as advantage as it used to be, but back in the day and that was a long time ago, pre-electronic ignition days, getting my distributer curved from a savy local race shop, gave me a huge advantage over my friends and street racing buddies. I kept it under my hat from all but my best friends. It seemed that a stock motor with a dialed in distributor and quadrajet was all it took to beat most comers with the exception of course from the guys with the fully built motors and cars. It seems a lot different now. Any kid with a few bucks can now buy a Mustang, drop in a super chip and they are down right fast. It seems hard to amagine it but back in the mid 70's it took a fully built race car and a very sharp mechanic to get in the 10 second range and that was when the street was full of big block power.
I think that's one of the reasons why a small Ford six has the appeal it does. It's gonna take all the tricks in the book to run with a new GT and then it's "I hope he hasn't changed the pulleys"...

 

[addo]

I know where you're coming from in terms of points dizzies.

The Bosch electronic unit is better than a DS-II, when both are stock form (this'll probably get me flamed). Not worlds better to the point where you'd spend $400 to adapt one if you were already running a DS, but still it is better. It's also integral to the dizzy so you don't have a separate box like with the DS-II.

I have been told by people with no vested interest either way, that the stock Bosch dizzy recurved, will see you right even into the nines.

Besides that, it's an external piece of the motor and most people don't really grasp it's function or versatility. Hence it gets overlooked in favour of fiddling with the carb. Or forgotten while the buildup is in progress, and the old unit just slapped back on as the budget runs dry.

People forget that one thing the points unit is excellent at, is sparking dependably under standard conditions. If only they were more used for initial startup on a new motor!

Cheers, Adam.

 

[Anonymous]

Got my 14892 cam last night, its nice .510 is plenty of lift for this cam and allows for a bit of wear. Only thing is it came with a large warning stating not to use bosch elect dizzy (.490 shaft) from latter falcons in early XC motors (.530) . I dont know what my Iron head crossflow is out of as it doesnt seem to have a serial number anywhere that anyone can make sence of.
The elect dizzy seems to fit very snuggly. How do you tell if its not a good fit and needs bushing?

 

[addo]

Get an XA or XB dizzy shaft and try stuffing that in the hole.

Once you have quantified that issue, order the correct Crow Distributor Gear. Ignore this at your peril!

 

[Anonymous]

That was a quick reply thanks.
I think I have the old dizzy from the 2V somewhere I think Ill try that shaft and see how I go.
Cheers Tim

 

[Anonymous]

Darn, I checked the bigger .530 shaft and it fits into my block. I guess Ill either have to change the shaft on the elect dizzy if this can be done or bush the block. How do they bush it when its is only .40 difference?

 

[addo]

I have run the smaller shaft, albeit with a stock 221 cam. I refuse to recommend this as I can't predict if it'll work for you or not.

Will PM you where to send the dizzy. You'll be spending another $200-400 depending on what gets done.

Adam.