Heat is the whole point. Assuming you are running the correct plug and its not shrouded, on a 2stroke there is no real performance difference from a head besides the compression benefit, which you can get from a stock head by sanding it down. Total opposite of a 4stroke, in which all the power is made in the head and cam.Is there a difference other than heat? Mr killa joule wonder
Not sure I agree either, but no worries - to each his own . IMO none of that is anything you would find on a chinagirl head, which is what I was limiting the thread to lol. All the chinagirl advertised heads are the same simple dome, tapered squish band with no performance benefit besides heat transfer and compression. There is no real R&D done on our parts because you would never recoup it selling them for $30 on ebay lol. Bet if you dyno'd a stock head and a fred head with the same cc's they would make identical power (unless it was on a combo that caused the stock head engine to overheat). I went with a Tomos head and shaped the squish band myself with an old piston and decked the head to proper squish distance and compression but none of that is a bolt-on thing you would get with an off the shelf chinagirl head...I don't have a dyno but I have personally tested CNC heads, stock heads, and moped heads and until compression and squish are changed there is no noticable performance difference IMO.Respectfully disagree. The heat reduction is great in after market heads, as is the increased compression, but that isn't where their superiority over a sanded stock head ends. You also see performance benefits through improved chamber design, hemi burn chamber for even spread of fire wall with squish band designed to reduce chance of detonation allowing higher comp. ratios and creates charge swirl for better combustion.
Add this to the fact that once the AM head is torqued it doesn't require constant re torquing, doesn't warp, lasts forever, and the crush ring extends to the chamber wall and the improvements over stock sanded heads are huge.
Agree to disagree. While there is most likely no R$D done for china girl there has been enough done on head design in general to make one superior in design to the stock crappers they come with. I agree that most of them have either to large of a squish ring or are improperly angled/shaped and it's a crap shoot getting one that does and shaping it yourself along with adjusting gap is the only way to optimize them. Also agree 99% is in pipe, jug, and carburetion. After all this I still believe in the Aftermarket VS sanded the aftremarket is the way to go. To reduce a stock head to the volume of a 6 cc head you would need to remove roughly .045" to .068" depending on the head you have as they come in quite a variety, and that is a lot of sanding along with moving the crush ring a lot farther into the cylinder.Not sure I agree either, but no worries - to each his own . IMO none of that is anything you would find on a chinagirl head, which is what I was limiting the thread to lol. All the chinagirl advertised heads are the same simple dome, tapered squish band with no performance benefit besides heat transfer and compression. There is no real R&D done on our parts because you would never recoup it selling them for $30 on ebay lol. Bet if you dyno'd a stock head and a fred head with the same cc's they would make identical power (unless it was on a combo that caused the stock head engine to overheat). I went with a Tomos head and shaped the squish band myself with an old piston and decked the head to proper squish distance and compression but none of that is a bolt-on thing you would get with an off the shelf chinagirl head...I don't have a dyno but I have personally tested CNC heads, stock heads, and moped heads and until compression and squish are changed there is no noticable performance difference IMO.
Tons of killer aftermarket 2stroke heads for motors like the AM6 and dirt bike motors with orings, better plug location, and proper squish bands but they won't just bolt to a chinagirl head.
Stock head is a warping prone piece of junk that runs hot, but from my experience makes the same power as a CNC head until you have enough compression and exhaust setup to cause overheating...the jug is still where 99% of the power is made
Is there a difference other than heat? Mr killa joule wonder