Crank balancing for 686?
#13
I'd save your money on the +1 valves I hear they don't do much unless you've got at least a 727. I switched my tranny over when I did my 686 also just for risks sake but then when I blew it the rod snapped the main axle and screwed the whole tranny up so that sucked my nuts. You might consider a better clutch, I hear sometimes they wear the stock ones out pretty fast.
#15
>>Truing your crank wheels to match your new rod is a very GOOD idea
Actually, you balance the crank for both the Rod and Piston assembly, including the rings, piston pin, bearing and circlip. Everything that moves up and down. If you change pistons (big bore kit, etc) and the weight changes much, you should rebalance.
Disclaimer- I'm the webmaster at Falicon. But that doesn't mean I know anything...
Actually, you balance the crank for both the Rod and Piston assembly, including the rings, piston pin, bearing and circlip. Everything that moves up and down. If you change pistons (big bore kit, etc) and the weight changes much, you should rebalance.
Disclaimer- I'm the webmaster at Falicon. But that doesn't mean I know anything...
#16
Originally posted by: FarmStud
Everybody here been happy with there stage 2 cams? I'll probly put in +1 valves too.
Everybody here been happy with there stage 2 cams? I'll probly put in +1 valves too.
#17
MasterOfGoingFaster . isnt it true that on a single cyl they balance the crank by moving the vibration frequency out of normal RPM range
Or something to that effect ?
By the way did you say they allready have the 92mm crank for sale? What about a knife edge rod ? do they make one for the Raptors?
Or something to that effect ?
By the way did you say they allready have the 92mm crank for sale? What about a knife edge rod ? do they make one for the Raptors?
#18
Glad I did, very little vibration and runs smooth, just need a little more grunt from the battery, evidently it takes quite a bit of juice to turn over 13.5:1 compression[img]i/expressions/face-icon-small-smile.gif[/img]
#19
>> isnt it true that on a single cyl they balance the crank by moving the vibration frequency out of normal RPM range Or something to that effect ?
Yes. You have it correct.
>>By the way did you say they allready have the 92mm crank for sale? What about a knife edge rod ? do they make one for the Raptors?
Well..... We can stroke the Raptor to 92mm, but we use a standard rod, since we don't have a Knife Rod for it yet. We really don't advertise it yet, because the pro builders know we can do just about anything they want, and our web site is to help racers understand what is available to their engine builders. So, yeah, we can stroke it to 92, but we were waiting for more feedback before we started talking about it. You can order the crank and rod, but we don't have it as a kit yet.
The JE Pison catalog shows a 102mm piston. Get the 10.75:1 compresson, since the stroker crank will raise the compression about a point. The 92mm crank and 102mm piston will give you 752cc. That's a 13% increase in displacement, so you might need to think about a pipe, carb mods and perhaps valve work. Depending on your application, of course.
Plenty of folks run stroker cranks with stock heads to shift the torque curve lower..
Yes. You have it correct.
>>By the way did you say they allready have the 92mm crank for sale? What about a knife edge rod ? do they make one for the Raptors?
Well..... We can stroke the Raptor to 92mm, but we use a standard rod, since we don't have a Knife Rod for it yet. We really don't advertise it yet, because the pro builders know we can do just about anything they want, and our web site is to help racers understand what is available to their engine builders. So, yeah, we can stroke it to 92, but we were waiting for more feedback before we started talking about it. You can order the crank and rod, but we don't have it as a kit yet.
The JE Pison catalog shows a 102mm piston. Get the 10.75:1 compresson, since the stroker crank will raise the compression about a point. The 92mm crank and 102mm piston will give you 752cc. That's a 13% increase in displacement, so you might need to think about a pipe, carb mods and perhaps valve work. Depending on your application, of course.
Plenty of folks run stroker cranks with stock heads to shift the torque curve lower..
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