Hi Duane,

I initially modified a Bosch Super RO 9 868 as I had a bunch of them left over from tuneups of the engines I use here.

After noticing leakage between the semisphere that I'd fitted(a cutdown domed nail head)and the plug base, I hunted around in the garage and found a plug with a longer electrode, being the Champion V12YX. This alleviated the leakage as it allowed my semisphere to sit quite a bit higher off the plug base.

I could have trimmed down the outside diameter of the semisphere to reduce the leakage, but it was far quicker just to modify the longer electrode plug.

I'm not sure as to the resistor aspect. I never bothered looking at that, for I figured I'd just see what happened when modifying the actual plugs that I've been using, just to see if a difference could be observed.

These are just your average standard type spark plugs, not performance orientated or anything.

The tests conducted on the engine in the videos are done with 8mm silicon leads, just your typical off the shelf leads, nothing special.

That engine is well worn too(400K+klm), the only thing deviating away from standard is the distributor, which is a Chev type HEI, coil in cap style, modified at the factory to fit the type of engines we commonly use here in Australia.

The point to the whole exercise was only to determine if the gains stated by the inventor had merit.

Of course I can go further with it, but I fail to see what good that would do, given that I did see a marked increase in performance of the plug with my simple modification.

The temperature tests that are linked to that other post see a different engine being tested, same type of V8 engine, just 59 cubic inches larger in capacity, yet built for very high performance operation.

This engine uses 9mm Eagle silicon leads, which are just a bit better than a normal silicon lead. It also runs a big cap Bosch HEI distributor, which is standard apart from being regraphed to suit the camshaft and associated performance modifications. The coil is a standard HEI type oil filled 50-55,000 volt number, just the same as what you run on any HEI from the factory.

Since I've now fitted the Brisk HOR15LGS plugs to the high performance engine, my plan is to upgrade the leads to the Nology Hotwire leads, thereby gaining an even better spark output.

If you viewed the temperature reductions in the indexing tests, you will understand what I'm chasing here. Robert Krupa says he saw a 100 degree combustion chamber temperature drop, the tests I did clearly show that I'm getting down closer to where he got.

There is no way to duplicate what he did, not without the Firestorm plugs, but rather than wait for their release, I'm opting to go for the next best plug at this time, being the Brisk Premium LGS.

Clearly the temperatures dropped markedly by indexing the standard plugs, then dropped again when swapped out for the Brisks, so by going to the Nology leads, I expect to see another temperature reduction.

This will have to do until the Firestorms are made available.