|
|
Post by scooter on Oct 29, 2014 5:23:18 GMT -5
I really don't need any more power, but I'm thinking of replacing my head because of some stripped threads. So I'm thinking, "while you're down there"...
Maybe I could put in a bigger cam for a more hot rod sound, or a slightly bigger cylinder, because, hey, maybe mine is worn anyway. And do I need that stroker crank? Why or why not? (I like the sound of Shannen's scooter. Nice job man.)
I figure at the least, if I do anything at all, I'll want new rings and a new head, and the head is going to come with new valves, and for a few more bucks I can have a new cylinder and cam, but I don't know what I want.
How do you choose what kind of things to put in and on your engine?
|
|
|
|
Post by scooter on Oct 29, 2014 16:24:19 GMT -5
I'm already good on the exhaust. I have one of these new fangled Varimuff Hi-Flow mufflers.  |
|
|
|
Post by xyshannen on Oct 29, 2014 16:49:04 GMT -5
Your cam choice really depends on what you are trying to achieve. I chose the A11 because according to the chart it has one of the highest amounts of torque mixed with the highest amount of HP. It's even higher than the A9. But it tops out at 8k RPMS where the A9 tops out at 8500. Now if I was interested in top end speed I would choose the A9. But having said that my setup still hits 60 MPH at about 7200 rpms, so I still, even at that speed, have more power to go. wildswede.se/Baotian/Cam_horsepower2.jpgedit: Further thought.. Since I'm not too concerned with taking this scoot over 50 MPH, I really want to try the A8. It should have plenty of pull from 0-45 and for me that's what I'm really looking for. Wile you have your head off, might as well look into a BBK..I mean why not, with the head off you've don'e  % of the work already. I have the 58.5 BBK from scrappy and have no complaints. The build quality is good, not any casting ruminants that I could find. rcq92130 has the 60mm kit that I want tho. www.ebay.com/itm/SCOOTER-GY6-HIGH-PERFORMANCE-TAIWAN-60MM-CYLINDER-KIT-CYLINDER-HEAD-CAMSHAFT-/181564749082?vxp=mtr The head that comes with this kit has larger valves than mine and if mine were not port and polished, should be a better performer. The only bad things I've heard about the ebay seller is that he pisses other vendors off because he takes name brand stuff and has it copied in Taiwan. But the killer is that other vendors charge more for anything made in Taiwan. Take my head from Scrappy for instance, it's made in Taiwan. The only reason I went with the scrappy kit is because I wanted a really good head. So I ordered their $150 big port head that is hand ported, only to get a run of the mill stock head. When I contacted them about it I discovered that they no longer can provide the big port head (that is to this day still for sale on their site) So they had to send me their $100 performance head and had me mail back the stock head. Wile they were polite about the whole thing, it still left a bad taste in my mouth. I find it pretty shady to be selling one thing and then try to pawn off stock equipment. Had I no clue about what I was looking at I would have installed the stock head and never been the wiser. I'm still contemplating getting the ebay kit I linked you to and just shelving the scrappy kit. |
|
|
|
Post by scooter on Oct 30, 2014 0:11:11 GMT -5
Your cam choice really depends on what you are trying to achieve. I chose the A11 because according to the chart it has one of the highest amounts of torque mixed with the highest amount of HP. It's even higher than the A9. But it tops out at 8k RPMS where the A9 tops out at 8500. Now if I was interested in top end speed I would choose the A9. But having said that my setup still hits 60 MPH at about 7200 rpms, so I still, even at that speed, have more power to go. wildswede.se/Baotian/Cam_horsepower2.jpgThat makes sense. The A11 has the most hastkrafter all throughout the usable motorvarv range. How does using that cam affect compression, my starter, strain on the engine components, and also you said you had to grind out your piston to make room for the lift of the cam? |
|
|
|
Post by xyshannen on Oct 30, 2014 0:31:51 GMT -5
The cam, no matter the size, had no effect on compression. Yes I had to grind out the intake butterfly cut on the piston. People are often afraid to do this sort of thing, but if you think about it, it's no big deal. You only have to remove a little bit and it should have no effect on how the engine runs. You just put some white grease on your valves and assymble your motor. Turn it over by hand, then pull it apart and check the piston. There will be a bit of the grease on your piston showing you where to grind.
|
|
% of the work already. I have the 58.5 BBK from scrappy and have no complaints. The build quality is good, not any casting ruminants that I could find. rcq92130