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Post by xyshannen on Nov 27, 2014 6:49:08 GMT -5
ccr They do make 4 valve heads, They just do not make very many cams. In all my research I've done I have only ever seen the cam that comes with the 4 valve head available. That's not to say there are not more options, just there are not as many and if there are more they are hard to find. The info I'm giving is from a gent named Buford here on the forums who does use a flow bench to test his heads, and again according too him the 4 valve head just can not match the performance of a properly ported 2 valve head. The thing with GY6 parts is that there has been a lot of research done into performance parts yielding in the production of very good performance parts. 1200 RPM springs can more than handle the need of the valves opening and closing on time. Keep in mind that the GY6, no matter the configuration, don't really need to turn more than 8500 RPMS. All 14+ of the available cams reach their peak hp production at 8500 and lower RPMs. On my setup, I have one of the most power producing cams available. My cam has so much lift that it did caused my intake valve to hit my piston. I had to shave a few thousandths of an inch off of the piston valve well to make it clear. I'm almost 1K miles on this top end and have had no problems. dmartin95 I'm good man, I've been around just not posting very much. The scoot's running like a madman on meth.
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Post by geh3333 on Nov 27, 2014 21:52:42 GMT -5
ccr They do make 4 valve heads, They just do not make very many cams. In all my research I've done I have only ever seen the cam that comes with the 4 valve head available. That's not to say there are not more options, just there are not as many and if there are more they are hard to find. The info I'm giving is from a gent named Buford here on the forums who does use a flow bench to test his heads, and again according too him the 4 valve head just can not match the performance of a properly ported 2 valve head. The thing with GY6 parts is that there has been a lot of research done into performance parts yielding in the production of very good performance parts. 1200 RPM springs can more than handle the need of the valves opening and closing on time. Keep in mind that the GY6, no matter the configuration, don't really need to turn more than 8500 RPMS. All 14+ of the available cams reach their peak hp production at 8500 and lower RPMs. On my setup, I have one of the most power producing cams available. My cam has so much lift that it did caused my intake valve to hit my piston. I had to shave a few thousandths of an inch off of the piston valve well to make it clear. I'm almost 1K miles on this top end and have had no problems. dmartin95 I'm good man, I've been around just not posting very much. The scoot's running like a madman on meth. What's your top speed with the 58.5 and the 30mm carb setup ? I may have asked you this before. |
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Post by xyshannen on Nov 28, 2014 8:39:12 GMT -5
I have no idea. I can run at 65 @ 7500 RPMS and still have plenty of throttle left and at that speed my scoot is still pulling hard. I'm not too interested in top speed. My scoot has crappy shocks and is shaped like a rolling brick so anything over 55 gets real sketchy. At 65 as of my last check, after a few seconds I have issues with fuel, like every one else with my type of scooter and the engine starts cutting out.
I'm running 10 gram rollers and stock gears. If I went up to 11 or 12 gram rollers I would have even more top speed.
I didn't build my scooter for top speed, I have no intention of ever taking it on the freeway. I am more interested in how fast I can get up to 55 and still have enough power to be able to get out of the way of the arsehole drivers in my city. On most of the main roads here that are 45 mph speed limit, if you can't run 50-55 you will get run over.
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Post by geh3333 on Nov 28, 2014 15:15:12 GMT -5
I have no idea. I can run at 65 @ 7500 RPMS and still have plenty of throttle left and at that speed my scoot is still pulling hard. I'm not too interested in top speed. My scoot has crappy shocks and is shaped like a rolling brick so anything over 55 gets real sketchy. At 65 as of my last check, after a few seconds I have issues with fuel, like every one else with my type of scooter and the engine starts cutting out. I'm running 10 gram rollers and stock gears. If I went up to 11 or 12 gram rollers I would have even more top speed. I didn't build my scooter for top speed, I have no intention of ever taking it on the freeway. I am more interested in how fast I can get up to 55 and still have enough power to be able to get out of the way of the arsehole drivers in my city. On most of the main roads here that are 45 mph speed limit, if you can't run 50-55 you will get run over. I understand , In my research it has become more and more evident how much a bigger carb improves performance on these engines . its nice to see yet another member with a 58.5 bbk able to hit the 65+ range. Your absolutely right, in many areas if you can't cruise near 55 your gonna have cars on your as- . even in many 45 zones many travel at even 60 mph . that was the main reason I did the mods on my scoot . its also nice to be able to pass a vehicle if you need or want to . Thanks |
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