Rob Schopf on welding flywheels
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- เผยแพร่เมื่อ 7 ก.ย. 2024
- Rob Schopf of 2 Boss Performance talks in depth about pro's and con's of welding V-twin flywheels. Rob has 30 years experience building High performance V-Twin Engines, has been crew chief and chief engine builder on a NHRA Pro Stock Motorcycle team.
I appreciate your video, I have an S&S crank on my workbench now ready to go into my personal 103-110 build and I've been having an internal debate as to whether I should weld it (I weld for a living) and I thought it would be added insurance especially after what happened to cause me to split cases in the first place. Your explanation made sense when the folks at S&S's didn't... Appreciate ya! It's going in as-is.
Thank you for taking the time to explain the differences of the flywheels.
Thanks for the info. My 96" twin cam is having issues after installing 103" jugs and I've yet to get an official diagnosis but I'm confident I'm having crank issues. It seems logical to just install an S&S crank assembly over welding and truing the stock crank and praying it doesn't have more issues later. I have a Rivera primo belt primary and keep breaking belts. I've come to the conclusion my crank is moving around hammering the belt and causing it to fail... Waiting to have the cash before I drop it off at the shop. Besides that she runs like a scalded cat and will spin tire under 30 mph without slipping the clutch. 103", SE255 cams. 58mm throttle bore. Power commander 5 and heads ported and polished with roller rocker assembly's. I should have upgraded the crank from the start.
Harley has to step up and make a solid crankshaft with side by side rods using clevite style bearing, mid USA produced the powerhouse 114 motor a few years ago with that kind of design .engine development from top flat track engine builders and I wonder why s&s wouldn't go for this same theory?
Great vid! thanks Rob
What did I get myself into when I parked my Honda sportbike and got a Harley? The crankshafts, or cam chain tensioners never entered my mind.
I just rode confident I could get 200,000 miles on it with just routine maintenance.
Well at least Harleys somewhat simple to work on.
I should have kept my victory
AWESOME video... thanks...
First time listener.
I am curious if you have worked with any flywheels from Darkhorse?
Thanks for the info.
nice 7min S&S ad, should’ve been on the super bowl
Thanks
Harley would be miles ahead if they bought S&S engines and installed them in new bikes.
Sales would go out the roof ! If you can't beat them join them.
Thanks man good food for thought I'll buy a SNS CRANK
Do you do balancing of flywheels at your shop? What type of balancing do you do?
Makes sense
I GOT A 88CI STOCK.. SLAPPING AROUND...DOES S.S HAVE MY ANSWERS TO A 2005 HERTITAGE STOCK CRANK NEEDS...IM RUNNING IT EVERY DAY BUT IT AINT PRETTY
Oshkosh here
there`s another solution: do some Hirth-couplings between flywheels and crankpins - expensive but lasts until eternity...
What do you think about evo flywheels and welding crank pin nuts?
Buy a harley. Buy the best. Ride a mile. Walk the rest.
😂😂😂
The LACK of QC in S&S parts over the last decade has seen the Majority of Riders go to DarkHorse for Quality components and who can blame them?.
Just get a japanese bike and you dont have to worry about fixing junk all the time. Comes great from the factory!
Embarrassing to ride though
Since you have not obviously torn down a Japanese bike after 10-15k miles you probably don’t know how worn the heads are, the tiny valves and seats are beat to shit so yeah, there’s that little thing too. Probably why they don’t hold value and are disposable.
S&S flywheel will move too.
m50vince Have you had S&S flywheels shift?
Here is precisely what it takes to break those. As we said since the 1970s, FTF.
th-cam.com/video/hkLUWqnk9s4/w-d-xo.html
Just checked runout on my 1200 mile 4 5/8 stroke S&S crank shaft... crank is pinched .0045 and shifted .0005. street application at 135 hp and 145 ft lb of torque. no wheelies or burnouts, and oh yeah Timken conversion as well. pulling the crank, spending another thousand dollars, reassembling and selling the machine..... Never again with HD or S&S, American JOKERS.
Ross Delauro
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Old post I know but..., s&s 106 b motor stroker build 4.5 inch wheels shifted TWICE in 40k kms. No burn outs or abuse. I ride long distances at high rpm (cruise at 35-4 rpm) not huge power 110 gp and torque. Checked with s&s on what I needed before the build. Very disappointed and extremely costly. Send to Darkhorse to get welded and plugged, blue printed case. We'll see.