Freestyle Affordable Power......... It's COMING

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waxhead

wannabe backflipper
Location
gold coast
Im glad to see you have finally released it. I remember talking with you about it a few years ago now. I have seen only part of the work that's gone into this cylinder and your going to be happy people. Some out side the box thinking to overcome the 62t short falls.
Would love to get a chance to build port one of these engnes
 
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waxhead

wannabe backflipper
Location
gold coast
The other interesting thing is the triple exhaust port. As I am sure you all know or pretend to know its about getting the pressure low enough after the exhaust port opens so the transfers can do there work. If you don't have enough pressure drop you will get a stalling of the flow in the transfers and then all the momentum has to be got again when the pressure drops. Big no no and a huge loss of power. This is why blow down is so important and its hard to get it with out getting some strange sounding port timings. This is why we all went to big exhaust ports and if you have a look at some of the aftermarket cylinders you will see that the port is very big ti try and drop pressure the down side is when the piston comes its a lottery if it going up the bore or out the exhaust. very hard on the ring and you will start losing power the second you start it up its gradual enough so you don't notice but its happening. the best way to do this is to divide the port ie bridge port or aux ports as in this cylinder Aux ports make more power ( fact) reason enough not to worry about the bridge port, oh they are more reliable as well. So now you can use decent timing to get the power you want with awesome blow down timing. The curve transfer loop is plain awesome, not new on a two stroke at all but certainly new to a 62t that's for sure. Going on what I see I would say this engine has the highest power potential of any 62t based cylinder I have seen to date and not by a small margin. Good effort you have stepped up the game
 
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waxhead

wannabe backflipper
Location
gold coast
Bobert540 said:
Just curious, seeing that the cylinder is cast, do you think the cylinder will handle 190+psi without a girdle head? Especially the 10mm...
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I know this is along way back but i just saw this thread. Cnc cylinders are crap (fact) look at the transfers and what they have had to do to the angles to get them to be able to be manufacutred on a cnc machine. Huge compromise. They have had to square them all up as they cant get the curve they want. Cast is by far better. Dont believe me look at all the honda and aprillia race bike engines that made 54 hp out of a 125. If cnc was good they would have done that. They didn't because they couldn't get the curve in the transfers they wanted. Not trying to cause a fight but seriously cnc cylinder have set the development back a long way. Give me cast dasa over a billet one any-day. But if your after bling bling then all good go cnc
 
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Bobert540

Bobert540

Site Supporter
Location
Rockford,MI
waxhead said:
I know this is along way back but i just saw this thread. Cnc cylinders are crap (fact) look at the transfers and what they have had to do to the angles to get them to be able to be manufacutred on a cnc machine. Huge compromise. They have had to square them all up as they cant get the curve they want. Cast is by far better. Dont believe me look at all the honda and aprillia race bike engines that made 54 hp out of a 125. If cnc was good they would have done that. They didn't because they couldn't get the curve in the transfers they wanted. Not trying to cause a fight but seriously cnc cylinder have set the development back a long way. Give me cast dasa over a billet one any-day. But if your after bling bling then all good go cnc
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Thanks for the info, I wasn't trying to argue billet vs cast. Just an inquiring mind.
 
LegDragger64

LegDragger64

X
Cylinder does have some similarities to the Aprillia 250 Honda killer . The two guys that developed it , Jan Theil and Frits Overmars are on forums telling everything about it . www.Pit-lane.biz/t117-gp125-all-that-you-wanted-to-know-onpaprika-rsa-125 That is a french forum but most of the thread is in english .
Frits Overmars is also on the www.kiwibiker.co.nz competition section , bucket forum , ESE Works engine thread . He comes in around page 350 . Best 2 stroke reading ever .
 
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kevbo

kevbo

Location
dfw
waxhead said:
That would be so dependent on who builds the engine the porting spec squish etc etc. Kinda hard to answer that question I would be expecting
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Its not a very relevant question here. I expect that it will be a good bolt on part that will make its owners happy. Im just curious about how much the narrow bore spacing and case passages affect bmep at higher rpms compared to an engine designed for more displacement from the start.
 
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waxhead

wannabe backflipper
Location
gold coast
Of course if you are starting with an engine designed to make bigger power from the start then your going to get better results that stands to reason. as long as you have the 118 centres its always going to be a compromise. However this is the best design I have seen to work with this compromise. As most people already have the stuff tto work with a 62t setup then it makes sense to use that.
 
masterblaster

masterblaster

X-H2
Got some more testing time on the 10 mill,its unreal the power its making even without the power valves.Explosive power is a under statement. Once we get the perfect dome profile and and get powervalves in the next prototype...its really going to be unreal. More testing on the SS later this week.
 
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