wildwestsydney

One nice thing about COP is you lose a big mechanical hunk, the distributor. Solid state electronics are far better then theit mechanical counter-part.

hacker-pschorr

There are a few out there who have produced engines that will benefit from COP.

When you reach this level, maybe then you will see the benefit.

Brett928S2

Hi

Whom and to what benefit...??

I repeat...the purpose of coils/plugs is to produce a good/perfect spark....nothing else...we already have that, so I can think of no circumstances where COP will improve anything apart from a little space where the twin dizzies are ..and even then you need extra space for the COPs....

I will also repeat....I am using B9ECS....these are VERY hard plugs to run...3 grades colder than normal for a 928...no supercharged or turboed car needs plugs as cold as this....and they run perfectly well (using Nitrous) with normal twin dizzy/coils....

If I really thought there was anything to be gained I would use COP ...or a Magneto...but there truly is not.

All the best Brett

BC

You are free to think that. Just don't disagree with others actively like below, because outside of your "belief" you are wrong.
You are mixing your opinion with facts again. What you have above is an opinion, not a fact.

hacker-pschorr

I am still waiting for him to explain why his 928 has a 35% drivetrain loss to the rear wheels.

largecar379

Electromotive has COP.

Carl Fausett is one of their distributors.

contact him for details.





--Russ

ExKiwi

There are other reasons apart from good/perfect spark to consider COP.

No more plug leads = higher reliability especially in humid/damp climates.

No distributor = higher reliability PLUS better timing accuracy/repeatability.

No distributor = no rotor arm to replace when worn.

No more high tension cables/connections coursing around the top of the engine, so no chance of someone getting a humungous belt from a spark plug lead while working on a running engine.

No more misfiring from wet HT parts.

Less rubber parts to degrade in hot climates.

Less radio frequency interference.

Anything i missed?

hacker-pschorr

His comprehension?

Brett928S2

Hi

You must be the dimmest person on this board....

Space saving from COP ...yes sort of.....

POINTS + CONDENSER = GOOD SPARK AT CORRECT TIME

ELECTRONIC DISTRIBUTOR + COIL = GOOD SPARK AT CORRECT TIME

TWIN DISTRIBUTOR + TWIN COILS = GOOD SPARK AT CORRECT TIME

MAGNETO + COIL = GOOD SPARK AT CORRECT TIME

COP = GOOD SPARK AT CORRECT TIME


If you are too dim to believe me, and I HAVE worked on ALL of the above...ask John Speake.....

OR instead of insulting me, try and explain EXACTLY what electrical/timing advantages a COP system has.....which you are going to find difficult as it has none bar space saving.....

All the best Brett

dr bob

Brett--

COP technology offers more exact ignition timing, since all the plug wires are now the same length. There's a significant reactive component in plug wires, especially in resistor wires needed for good radio interference suppression. The benefit is probably not noticeable on a street motor, but it makes a big difference when the RPM's get higher. Think about having unequal length manifold runners or header tubes, and consider that having different length plug wires has the same effect on the ignition pulse going to the plugs.

andy-gts

I think you are all saying the same thing, cool idea trying to advance the technology of the 928. I just wish I had an engine that could take advantage of the COP.
andy

Brett928S2

Hi

I see your point but unfortunately its not correct...when I started using Nitrous and spark strength became VERY important to me, I measured at the plugs with standard leads and with a new set of Nology leads.

The two sets had no appreciable difference and the shorter leads had no difference to the longer ones....

I was quite impressed on how our original leads performed after 20 years, and only really changed to the Nology ones because they were brand new.

I realise that COP has no appreciable lead length, but until I see some figures that give me an idea that there is ANY advantage to them, I will give them a miss....they are not cheap either....

But I am always willing to listen and learn so if anyone can show me the actual figures showing any advantage to them ...... ???

All the best Brett

Alan

I actually mainly agree with Brett here.

Unless you are going to install a significantly more complex spark controller - there aren't a lot of benefits to be had and its quite a lot of work to even get back to where you are now.

Allowing for the fact that the install will be a one-off enthusiast modification - I think we have to discount any reliability benefit - not because you will mess it up - but there are always unforseen issues and without the benefit of a big R&D organization & prototype trial & error - you find these on the road while driving...

Any better accuracy in spark timing is dependant on the accuracy & adjustment of the posiition sensing methods used (if new) and if the EZK is used its in a different configuration to how it was designed.

COP can provide some new means to position the spark per cylinder and on a well engineered & debugged platform can provide many of the before mentioned benefits - however on a retrofit much is different...

If you aren't going into it with plans to extract major benefit of the new features - why go into it at all?

If so what do you plan to gain out of this in terms of engine management features?... since if done less than perfectly - it could make you car significantly less reliable.

Alan

123quattro

One other nice benefit is the wide range of spark timing you can run when you dump the distributor. Especially with turbo cars where very retarded timing can be beneficial. On my Audi my timing map has a 100 degree crank angle spread on it. You can't run nearly that large of a window with a distributor. That, and you can run very powerful coils and not need to worry about spark jump on the rotor.

hacker-pschorr

This coming from the guy who claims not a dyno in europe can handle the power his car is making.
On top of that the dyno that was posted during early testing you clamined a 35% drivetrian loss to give you 500rwhp.
As a bonus, where are those pictures of the nitrous bottles bolted to the balsa wood that makes up the rear seats?

Yup, I'm the dim one.


Good luck, and please do not die in your high speed attempt.