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Yes we ended up pulling back on the timing up top. The reason being the extra turbulence from a proper squish band makes the fuel/air burn faster. But by your question I know that you know a more efficient chamber requires less advance

Yeah it’s a fair amount huh. People really misunderstand how much is waiting in there engines with a modern combustion chamber. Everyone out there is running leaded fuel combustion chambers. Have a look at a stock Yamaha head and you will see they have a better chamber, it’s not ideal but...

Good ideas thanks. It was worth 4hp on a 250 cc kart engine

Thank you, your feedback is appreciated and just making cool stuff is fun enough. it great to be doing this

Thanks for you feedback

Ski build up looks awesome

The only reason it should spin is from a lack of crush on the head. I have put in crush on this head so this will not be an issue. I feel like I’m shutting your ideas down a little. Please don’t think I’m doing it on purpose you are simply saying things that I have been thinking about and...

Yeah I would rather make it slightly smaller to allow more cooling on it but cracked domes are never fun so this is a compromise.

Here you can see the issue I am having. Trying to get the spark plug low enough

Hahaha. Most definitely not

To further expand on this question, you are now taking the ignition point away from the centre of the chamber which is the very thing i am trying to make better. twin plugs are great for planes where you cant swim them in, Snow mobiles where you cant afford to be stuck out and eaten by a bear...

Not so much issues. They do what they are made to do just fine. Combustion chamber shape design has long since moved on from what they are offering now. PLus the added bonus of a decent programable ignition you can write a curve to run with your combustion chamber shape

Yeah I understand what you are saying. its hard to make stuff look different than most other heads out there as the same basic structure has to be kept.

Yeah I understand that bit, its about the bling bling no the go go.

Its not a case of them wanting to buy ada domes its a case of me being able to sell my domes to ada owners. There is not enough of a market to make heads with no compatibility now a days.

No dual plugs always results in a hp loss

It was going to be Iridium. but I think i may have it sorted, I will just run a very narrow cs oring on the top.

NO your not but there is plenty of people out there who do strange stuff

Everything you are saying is very valuable to me and I really appreciate any feedback or ideas

All these things we are trying to avoicd of course, " cracking domes" Where did the tpe domes crack