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Improvised oscilloscope probe for Automotive ignition analysis.

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Johnny10:
If you are helping to solve the engine mystery than you should have something to bring to the table.
An engine misfire is a symptom of a problem with Fuel, Spark or Compression.
You seem to have fixed your sites on Spark, yet after completely changing the ignition system you still have misfire.
This is a distributor type ignition, besides the electricity flowing to the spark plugs there are also mechanical issues to be addressed.

I hadn't realized that this Grey Motor has cult status in the Australian Racing world.

You should be able to find lots of information about every aspect of this engine.
Actually in the short time I researched the engine I found tons of information.
This engine was tuned for performance over quite a number of years.

I enjoyed acquiring the knowledge and collecting and building all the tools to know what was really happening in my engine.

I was never much for parts changing as a repair technique.

You are on an adventure, good luck, get in there get your hands dirty.






joeqsmith:

--- Quote from: Jim-0000 on January 09, 2019, 03:18:33 am ---Also, the missfire was there with the first (or original) engine in the car when it was first acquired. So, much more than ignition components have been swapped. I might have already mentioned this, but the triple 11/2 SU carbs were swapped for a single (forgot the brand) carb and a new manifold fabricated out of two, all in an attempt to fix this miss fire.
The engine was swapped as this one was being modified extensively for performance and the original one was being used meanwhile.

--- End quote ---

Would be funny if the fuel pump or the cell was the problem.   Maybe all their high load testing is at the track instead of on the dyno and there's no baffles in the cell.  Maybe they are pumping air...  Maybe the pickup in the cell doesn't stay where the fuel is...

I had similar problems with oil.  It tough to keep fluids where you want them.  After several baffle and pickup designs I sorted it out....  With data logging...  (Add fuel pressure to that list as well)

Jim-0000:

--- Quote from: joeqsmith on January 09, 2019, 06:00:38 pm ---.............................
Would be funny if the fuel pump or the cell was the problem.   Maybe all their high load testing is at the track instead of on the dyno and there's no baffles in the cell.  Maybe they are pumping air...  Maybe the pickup in the cell doesn't stay where the fuel is...
..............................

--- End quote ---

What is the "cell"? Is that what we would call the tank? I assume it is. This car is fitted with a tank designed specially for racing.
The car has been on the dyno twice. The same symptoms occur there as on the track.
I don't know how fuel flow is, or could be, data logged.
Thanks for the post.

Jim-0000:

--- Quote from: Johnny10 on January 09, 2019, 01:43:19 pm ---If you are helping to solve the engine mystery than you should have something to bring to the table..................
--- End quote ---

I mentioned in an earlier post that I have been suggesting that solid core plug wires should be fitted to replace the common type suppression leads on the car (core type unknown), for some weeks now. There has been resistance and all of it is not in the car! (pun intended).
Somewhat reluctantly, the owners have ordered a set of solid cored ones as described above.
Also, I now have arranged the loan of an oscilloscope and suitable probes with which to do an ignition analysis should the new leads not solve the problem.
I don't have anything else to "bring to the table".
Meanwhile, the owners brother is talking about the problem still being induction related. Even though two very different carburettors and manifolds have been fitted and tried.
But for all I know, he may be on the right track as I am out of my experience and skill range here.


--- Quote ---............................. yet after completely changing the ignition system ..........................

--- End quote ---

Not quite. See above.

Thanks for your encouragement.

joeqsmith:

--- Quote from: Jim-0000 on January 09, 2019, 08:39:43 pm ---
--- Quote from: joeqsmith on January 09, 2019, 06:00:38 pm ---.............................
Would be funny if the fuel pump or the cell was the problem.   Maybe all their high load testing is at the track instead of on the dyno and there's no baffles in the cell.  Maybe they are pumping air...  Maybe the pickup in the cell doesn't stay where the fuel is...
..............................

--- End quote ---

What is the "cell"? Is that what we would call the tank? I assume it is. This car is fitted with a tank designed specially for racing.
The car has been on the dyno twice. The same symptoms occur there as on the track.
I don't know how fuel flow is, or could be, data logged.
Thanks for the post.

--- End quote ---

Yes, the tank that holds the fuel.   
https://www.onallcylinders.com/2013/03/25/monday-mailbag-fuel-cells-vs-fuel-tanks/

To record the pressure I just put a sensor right in the fuel distribution block.   

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