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Showing results 1 to 25 of 175
Search took 0.03 seconds. Search: Posts Made By: Fred Winterburn
Forum: Porsche 911 Technical Forum 01-10-2023, 12:47 PM
Replies: 36
Views: 3,923
Posted By Fred Winterburn
The primary reason that CDI delivers more power...

The primary reason that CDI delivers more power is because the current and voltage are much closer to being in phase than with an inductive system. With CDI, the current is leading somewhat, and with...
Forum: Porsche 911 Technical Forum 12-24-2022, 08:39 AM
Replies: 36
Views: 3,923
Posted By Fred Winterburn
The bitumen or tar filling of the older Bosch...

The bitumen or tar filling of the older Bosch coils seems to last well in moderate to hot climates, but not so well in climates that experience really cold temperatures. At least that's been my...
Forum: 911 Engine Rebuilding Forum 03-27-2022, 10:58 AM
Replies: 52
Views: 7,476
Posted By Fred Winterburn
I don't have the particulars or Bob's design, but...

I don't have the particulars or Bob's design, but he is not using the Bosch design for his dual output CDIs. All I know(or think I know from some correspondence) is that he uses power supplies with a...
Forum: Porsche 911 Technical Forum 12-10-2021, 04:24 AM
Replies: 50
Views: 10,476
Posted By Fred Winterburn
11000 rpm on a V8 is one heck of a spark rate...

11000 rpm on a V8 is one heck of a spark rate (733 sparks/second). I would have expected a different design, but with a small discharge capacitor and special coil it could work, or perhaps it...
Forum: Porsche 911 Technical Forum 12-09-2021, 04:31 AM
Replies: 50
Views: 10,476
Posted By Fred Winterburn
Jonny, If you ever get a schematic of the Lucas...

Jonny, If you ever get a schematic of the Lucas CDI, I would be interested in seeing how they went about it, just for curiosity's sake. That's the company that at one time stated they would never...
Forum: Porsche 911 Technical Forum 10-21-2021, 04:03 AM
Replies: 28
Views: 10,516
Posted By Fred Winterburn
Good work tracking that down. Short of a...

Good work tracking that down. Short of a lightning strike right on the car, I really don't see that shielding is necessary to prevent spurious triggering of the CDI. I wonder what test scenario or...
Forum: Porsche 911 Technical Forum 06-11-2021, 04:36 AM
Replies: 15
Views: 1,323
Posted By Fred Winterburn
I could have described it better too. I should...

I could have described it better too. I should have stated that the slope of the secondary voltage rise remains unchanged even after the plug fires. While the spark voltage is dropping after the plug...
Forum: Porsche 911 Technical Forum 06-11-2021, 03:35 AM
Replies: 15
Views: 1,323
Posted By Fred Winterburn
Except that it doesn't with CDI. I believe the...

Except that it doesn't with CDI. I believe the overshoot on the secondary with CDI is due to leakage inductances which can't be gotten rid of entirely. Turn up the scope intensity and watch the...
Forum: 911 Engine Rebuilding Forum 05-22-2021, 05:20 AM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
Certainly the main reason must be cost versus...

Certainly the main reason must be cost versus reward. COP solves several of the problems which CDI solved first with distributor systems, but it can't solve all of them completely (IMO). With regard...
Forum: 911 Engine Rebuilding Forum 05-21-2021, 04:37 PM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
I really wanted to make a few corrections, but...

I really wanted to make a few corrections, but this time I couldn't:). I would like to know the absolute reason why CDI is not used in a COP system anymore (other than Saabs older system). The slew...
Forum: 911 Engine Rebuilding Forum 05-17-2021, 01:53 PM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
Mark (or Wayne?), Testing or experimenting; all...

Mark (or Wayne?), Testing or experimenting; all semantics to me. That wording was not intended to be insulting, although having worked in nuclear for years, I know our bosses did not like it if...
Forum: 911 Engine Rebuilding Forum 05-17-2021, 08:06 AM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
Neil, Torque, Yes, but one can't mention...

Neil, Torque, Yes, but one can't mention everything. This morning I had a short discussion with the fellow that gained 20% in mpg on his Healey. I mentioned that I'd bet that with full combustion...
Forum: 911 Engine Rebuilding Forum 05-17-2021, 05:10 AM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
Jeff, I could go on forever. I have never...

Jeff,

I could go on forever. I have never tested an M&W CDI. I certainly agree with M&W on mJ outputs as those numbers are almost meaningless unless the whole package is considered. My R&D...
Forum: 911 Engine Rebuilding Forum 05-16-2021, 03:55 AM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
M&W (please, do you have a name?). Once again...

M&W (please, do you have a name?). Once again with regard to spark plug life, that is a function of CDI power. Too much spark power past a threshold causes excessive erosion of conventional spark...
Forum: Porsche 911 Technical Forum 05-14-2021, 05:36 PM
Replies: 15
Views: 2,079
Posted By Fred Winterburn
Sorry, I do not own a Porsche, but I do know that...

Sorry, I do not own a Porsche, but I do know that old style Bosch platinum plug is a misfire waiting to happen. I would also stay away from Champion resistor spark plugs as the resistors used to be...
Forum: 911 Engine Rebuilding Forum 05-14-2021, 04:45 PM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
Let's keep it technical shall we? Over and out....

Let's keep it technical shall we? Over and out. Fred
Forum: 911 Engine Rebuilding Forum 05-14-2021, 03:46 AM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
I find that very interesting and can only assume...

I find that very interesting and can only assume you have not done the same type of experiments or looked for the same things. To have contrary findings would mean your experimentation was done with...
Forum: 911 Engine Rebuilding Forum 05-13-2021, 02:23 PM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
A few corrections. CDI doesn't necessarily erode...

A few corrections. CDI doesn't necessarily erode spark plugs at a higher rate. Mine erodes them at a lower rate than the Kettering system when used with a conventional inductive coil (which is what...
Forum: 911 Engine Rebuilding Forum 05-13-2021, 02:10 PM
Replies: 41
Views: 16,956
Posted By Fred Winterburn
Want to know the difference? Read my account of...

Want to know the difference? Read my account of the experiment from a few years ago. Erase from your mind what you may have read before. Furthermore, a CDI does not need high voltage to outperform an...
Forum: Porsche 911 Technical Forum 05-12-2021, 05:23 PM
Replies: 15
Views: 2,079
Posted By Fred Winterburn
Yes, They are the worst spark plugs ever and...

Yes,
They are the worst spark plugs ever and thank goodness they aren't made any more, at least I think that style is no longer made. The platinum is flush with the insulator and burns away leaving...
Forum: Porsche 911 Technical Forum 05-10-2021, 06:40 AM
Replies: 50
Views: 2,971
Posted By Fred Winterburn
Thanks John, Got it! Fred

Thanks John, Got it! Fred
Forum: Porsche 911 Technical Forum 05-10-2021, 04:23 AM
Replies: 50
Views: 2,971
Posted By Fred Winterburn
Still, I'm completely confused. What is the...

Still, I'm completely confused. What is the purpose of the extra HT wires? Output to what? What else could possibly need high voltage other than the spark plugs. There are easier and lower voltage...
Forum: Porsche 911 Technical Forum 05-09-2021, 06:30 PM
Replies: 50
Views: 2,971
Posted By Fred Winterburn
No, but I see low voltage stuff too close to high...

No, but I see low voltage stuff too close to high voltage stuff. If that is fibre optic, then not such a problem, but perhaps you could elaborate? Guessing is not a game I enjoy. Fred

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Forum: Porsche 911 Technical Forum 05-09-2021, 03:18 PM
Replies: 50
Views: 2,971
Posted By Fred Winterburn
I think the perfect ignition system is going to...

I think the perfect ignition system is going to take the input of several designers with different approaches that reach a compromise that fits all criteria and engine builds, but in the end is...
Forum: 911 Engine Rebuilding Forum 05-07-2021, 02:50 PM
Replies: 244
Views: 25,020
Posted By Fred Winterburn
Believe me when I say it was an educated guess...

Believe me when I say it was an educated guess that this was Ashlock's work. The simplicity and layout of the board, for the work it has to do was the clue. You've partnered with a good man. Fred
Showing results 1 to 25 of 175
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