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Hi There, I'm interested in this. Please send me any links or references you may have.

You could consider developing a board that packages the small coil and HT lead all built in. Then you just plug in the CDI and connect the Hall lead and the spark plug lead to the engine.

Good one! I like the original mini relay packaging, neat! All the bench tests I did here were impressive and I could stretch the spark about 1" and still push 18,000 spark per minute on the lathe. So I thought what the heck for giggles lets hook it up to one side of our 9 cylinder radial's...

Can someone confirm that modern coil over plug ignition systems as seen on bikes and cars today are using a transistorized ketering or CDI triggers? I'd imagine those tiny coils above each plug would be CDI?

I once had a 60s VW beetle that had a piston with a broken top piston ring that was in two pieces, probably from detonation. Anyway it ran like this for many years and I would never have known until the day I rebuilt the engine and found it like this. So even though the ring was broken in two...

No no, I too did calculate the fully expanded gap before milling it. There was a formula for calculating the wide open gap back in the SIC. days. But as I said earlier IMO, with in reason, the wide open gap is not all that important. What is much more important is that the ring's final OD is...

I personally would not bother with the staggered gap nor the non uniform ring section. Way too complicated for what you need and to be frank I doubt would offer you any noticeable advantage. I would say that any piston ring of about 1-1.2 mm in width with any sprung gap that closes fully when...

Yes you are missing it. The gap I'm referring to is not the closed gap ie not the gap when the ring is compressed and in the cylinder bore, no no but rather the fully sprung open gap ie the gap the ring would have when outside the cylinder. When the ring is in the bore the gap is near zero...

Interestingly watching the Hastings promo video below I can see that the professionals also first machine the gap to width then finish turn / grind the OD, ID and faces. They do not appear to split, spread and heat treat the rings to form the gap.

This method is similar, but rather than making a slotted tube. I just make one ring blank at a time and then mill the gap into each ring blank individually. Also the tapered sleeve I use for closing the individual ring gap prior to clamping, I feel is going to do a better job of closing the...

Yes that's correct the turning mandrel would hold one ring at a time, well mine did. Once the ring is in the turning mandrel you can imagine how quickly it would be to get the OD to finish size. You could of course have the turning mandrel hold more than one ring at a time just so long as you...

My fellow Aussie, bluejets, You have stumbled into my thread, where I discuss making rings cold, using no heat treatment. It's not a poll! Seeing as you mentioned it, I wonder how much more beer I can buy from what I saved not having to purchase an oven? But at least I fixed your ignition...

There is no doubt the Trimble method has made good working rings in the past and yes I recall there was a special tool used to hold all the rings accurately while being heat treated. And it would want to as those tiny parts would go bananas with distortion otherwise. The splitting process used...

The Trimble heat treat (hot) method uses a spreader of a certain size to form the desired gap, If using my adopted (cold) method you would still use the same gap only you would machine the gap, this is done BEFORE the rings are finished. The end result will be the same, well not really as using...

TIP: With the gap held completely shut you turn the rings to bore size. This will see the ring have zero gap when the ring is installed into the cylinder. That's fine leave it at zero! Because a small clearance gap will soon open up with just the slightest of wear on the first run. This is...

Hi Branislav, yes of course the ring will spring back to the normal wide open gap state. Because the gap was physically machined in when the ring was complete and relaxed so to close the machined gap requires force. In the rings relaxed state the gap is wide open. Where as IMO the less...

To be frank, any aluminium material that turns well will work just fine for shop pistons. I made my pistons from 6061-T6 bar and they have given me no troubles and I have run this engine hard, the engine is 25 years old. I can recall there was a cylinder bore to piston OD ratio I used for...

I just posted this thread on how I made my piston rings, using no heat or ovens, so with the absence of any heat treatment, you will have zero distortion. I have not seen this method discussed before, take a look. I certainly worked for me...

G'day guys, I thought I would share my method of making piston rings, I have not heard this technique discussed in any the forums, but then again I don't get out much, so it very well may have been. In 97' I designed and built my own 7 cylinder radial, the heads were inspired by the Hodgson...

MORE INFO: Hi all, well I can 100% confirm that , as I suspected there are indeed variations of this so called 4 PIN 12 VDC CDI. So far I have received two of these units from two separate eBay suppliers. The units are packaged the same but each performed differently. These differences below...