Engine type/geometry

[radiatedmocha27]

My first real question is despite the tweaks I have done to it still not sure if these engines are any good.

Most importantly my second question is what type of geometry is this engine and what type of parts am I going to be looking at on terms of compatibility for high horsepower output claims that it's rated for six horsepower maximum at 6,000 RPM, realistically I would like to run that up into the double digits compared to a phantom 85 how much horsepower do those things make and would it be difficult to exceed that number?

 

[ImpulseRocket]

A Phantom 85 V3 completely stock makes 5hp at 9500rpm and with the reeds delted and a standard piston they make almost 6hp. I think their power figures are a bit... optimistic for that engine. In theory it might make 4hp, but in reality it probably makes about 3hp. The real party trick of Saw based designs like the Phantom and Avenger is the low rpm torque. The Phantom peaks over 5ft-lbs at 3500rpm, the avenger is almost exactly the same. Saw designs are almost perfect for motorized bikes because of this.

Could you make that engine make more power and RPM? Sure you can. With the right port work anything is possible.

 

[radiatedmocha27]

A Phantom 85 V3 completely stock makes 5hp at 9500rpm and with the reeds delted and a standard piston they make almost 6hp. I think their power figures are a bit... optimistic for that engine. In theory it might make 4hp, but in reality it probably makes about 3hp. The real party trick of Saw based designs like the Phantom and Avenger is the low rpm torque. The Phantom peaks over 5ft-lbs at 3500rpm, the avenger is almost exactly the same. Saw designs are almost perfect for motorized bikes because of this.

Could you make that engine make more power and RPM? Sure you can. With the right port work anything is possible.

I never really trust the power figures but I do know what makes a fat bit of torque and I have checked the bore and stroke on it and it is indeed a true 100cc which I was excited to figure out but realistically I would like to make double digits with this thing I'm not necessarily concerned about if it's safe, do you know if it's related to the YD100 in any way or is that a different configuration such as block geometry? The configuration of the motor and the family that it's in is my number one concern because that tends to be the limiting factor on what type of parts are acceptable for it though I'm not really afraid to Frankenstein the thing together I would like to have a reliable starting point though

 

[ImpulseRocket]

I never really trust the power figures but I do know what makes a fat bit of torque and I have checked the bore and stroke on it and it is indeed a true 100cc which I was excited to figure out but realistically I would like to make double digits with this thing I'm not necessarily concerned about if it's safe, do you know if it's related to the YD100 in any way or is that a different configuration such as block geometry? The configuration of the motor and the family that it's in is my number one concern because that tends to be the limiting factor on what type of parts are acceptable for it though I'm not really afraid to Frankenstein the thing together I would like to have a reliable starting point though

Without more detailed pictures and measurements I couldn't begin to tell you anything about that particular engine. Judging by the 49mm bore, I would assume it is not a YD100 based engine, but a big bore version of an "80" style engine.

 

[radiatedmocha27]

Without more detailed pictures and measurements I couldn't begin to tell you anything about that particular engine. Judging by the 49mm bore, I would assume it is not a YD100 based engine, but a big bore version of an "80" style engine.

What kind of measurements would you need to figure out what family of engines that it's related to?

 

[ImpulseRocket]

What kind of measurements would you need to figure out what family of engines that it's related to?

Head stud spacing mainly. YD/LD 100 engines are 50mm square spaced.

 

[radiatedmocha27]

Head stud spacing mainly. YD/LD 100 engines are 50mm square spaced.

It's 45mm

 

[GW's Motorized]

I highly doubt that engine makes what it claims

 

[Chainlube]

It's 45mm

That sounds like your basic 66cc to me. Across the bore will be 47mm.

 

[radiatedmocha27]

That sounds like your basic 66cc to me. Across the bore will be 47mm.

49mm bore and 40.2mm stroke