Billet Head

[Quinc]

Also please do like Cool did with the banshee head/domes and put a notch on the dome that lines up with the head so it wont spin when tightening or loosening plugs.

 

[Jyzmbe]

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.

Just run cooling in head first.


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[waxhead]

Also please do like Cool did with the banshee head/domes and put a notch on the dome that lines up with the head so it wont spin when tightening or loosening plugs.

View attachment 422524

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 dealt with. Your ideas are vey valuable to me please keep them coming

 

[800750]

I have no problem spending $20 a plug if the dome shape you are talking about has a performance advantage. I've never seen a 2 stroke dome shaped like that and for that simple reason I want one now.

 

[Sparkplug]

How many people have bought your manifold. And head pipe. The sane amount are gonna buy your head.

Guys like me with 2 skis. A flat and surf. Aren't gonna buy a no name head for their 1100 flat water. And I'm not bringing 200 dollars in plugs to surf cause freshwater guys don't know what fouling plugs is.

Not sure if your trying to make money. Or gain clout. But your gonna lose money if you make any t or x based head with a Unicorn plug. 10 yrs from now half the people running x or t motors won't. The people that run them now aren't gonna benefit enough from going to your more efficient design and gaining 1/8th of a hp. At least I wouldn't. And I buy all the one off jet ski stuff. Bought your stuff just cause


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[mikidymac]

It’s funny that the people that bitch about the sport dying and no aftermarket support are the same ones that come up with every reason a new product shouldn’t be made.
Keep innovating Wax and bringing new products to the ones willing to support your hard work.

Obviously the people that think there’s no money in it and no demand are not in touch with reality. Have you seen the prices of used skis and parts this last year and all the suppliers that sold out of products. Skis are big at the moment.

 

[waxhead]

How many people have bought your manifold. And head pipe. The sane amount are gonna buy your head.

Guys like me with 2 skis. A flat and surf. Aren't gonna buy a no name head for their 1100 flat water. And I'm not bringing 200 dollars in plugs to surf cause freshwater guys don't know what fouling plugs is.

Not sure if your trying to make money. Or gain clout. But your gonna lose money if you make any t or x based head with a Unicorn plug. 10 yrs from now half the people running x or t motors won't. The people that run them now aren't gonna benefit enough from going to your more efficient design and gaining 1/8th of a hp. At least I wouldn't. And I buy all the one off jet ski stuff. Bought your stuff just cause


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Thanks for you feedback

 

[waxhead]

It’s funny that the people that bitch about the sport dying and no aftermarket support are the same ones that come up with every reason a new product shouldn’t be made.
Keep innovating Wax and bringing new products to the ones willing to support your hard work.

Obviously the people that think there’s no money in it and no demand are not in touch with reality. Have you seen the prices of used skis and parts this last year and all the suppliers that sold out of products. Skis are big at the moment.

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

 

[WFO Speedracer]

It’s funny that the people that bitch about the sport dying and no aftermarket support are the same ones that come up with every reason a new product shouldn’t be made.
Keep innovating Wax and bringing new products to the ones willing to support your hard work.

Obviously the people that think there’s no money in it and no demand are not in touch with reality. Have you seen the prices of used skis and parts this last year and all the suppliers that sold out of products. Skis are big at the moment.

It doesn't matter anyway the people that spend money don't bitch , the people that bitch don't spend money, who said that I did.

 

[te4250]

Out of curiosity how much gain did you see doing this in the kart? How much is the deviation between the Yamaha piston profile and the ada dome profile along the squish band?
I like what @Storbeck said about moving the retaining o ring to the major diameter, could also skip both and tighten up the fit so the domes are a hand press in, size your headshell slightly under ada so the domes are still backwards compatable despite any variation in ada’s bores, or even could groove your headshell for the upper retaining o ring instead of the dome

 

[waxhead]

Out of curiosity how much gain did you see doing this in the kart? How much is the deviation between the Yamaha piston profile and the ada dome profile along the squish band?
I like what @Storbeck said about moving the retaining o ring to the major diameter, could also skip both and tighten up the fit so the domes are a hand press in, size your headshell slightly under ada so the domes are still backwards compatable despite any variation in ada’s bores, or even could groove your headshell for the upper retaining o ring instead of the dome

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

 

[Quinc]

If that translates to 8hp+ on a 701 sign me up for 2.

 

[waxhead]

If that translates to 8hp+ on a 701 sign me up for 2.

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 they did try and get the spark plug closer to the piston

 

[Storbeck]

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 they did try and get the spark plug closer to the piston

Did the change in combustion chamber shape allow (or require) lower timing advance?

Assuming the 250 motor was already at a pretty high state of development, that sounds like an awesome gain.

 

[waxhead]

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

 

[bored&stroked]

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, or where your ignition system is unreliable and you need to be able to switch to a completely different ignition system to keep the ski going

Don't forget Mercedes-Benz and Porsches for emissions before they figured out how to make a really efficient burn in the cylinder.

 

[bored&stroked]

Also to add, if I can afford a $50 set of sparkplugs, I'm probably not running a 701/760 motor. So the big motor guys who spends thousands will probably be all for it because they will pay for power, everyone else probably won't.

 

[OtherDonnieGuy]

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

Just to pick your brain, What kind of loss would there be just leaving the spark plug like that, and not fully enter the chamber? Only reason I ask is I'm thinking of how many times I have had to use the wrong plug in a pinch, ES in stock heads and HS with aftermarket, and can't tell a bit of difference.

 

[waxhead]

Im not sure on a dyno as to how much you would lose leaving it like that. Its not something you would dyno. The plug position is not the only thing in the head that makes a difference. Its just one of them.

 

[aboarder]

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

Having worked at a shop that modded motorcross, karts and sleds, I'm blown away by that number. 4 hp on a 250cc by just changing dome shape is huge. Watching the master at work in the shop, and seeing the numbers on the dyno with each mod gives you a real appreciation for what it takes and how much power that really is.

That said, I have a stock head that was modded by Group K. It has a similar design, and this finally explains why my motor seems to pull so much harder than others that have the ADA. I thought it must be because of the awesome job of mild case porting I did in my garage. I never really looked at the dome shape on the ADA's until now.

If you decide to make a new head altogether that doesn't have interchangeable domes with the ADA head, you will have the market. I think people would be willing to buy the new head shell that says WAX. Every time someone with an ADA head opens their hood on the beach, others will know they're lacking. I'd rather have a superior design that doesn't compromise on performance or strength, and not have to spend that much on plugs when there's a $5 pair on the shelf that could have worked. I would buy the expensive ones if I have to, but I know it would upset me every time I went to buy a set lol. I know people don't want to spend the money up front, but it would cost less in the end.

Plus, why would you want to have your superior product hidden under the ADA logo?