SEBSPEED Posted April 12 Share Posted April 12 It is similar, but different in a few areas. Quote Link to comment Share on other sites More sharing options...
WackenSS Posted April 17 Author Share Posted April 17 I'm just going to leave this here ⚙️🤷 1 Quote Link to comment Share on other sites More sharing options...
Member Contributer bmart Posted April 17 Member Contributer Share Posted April 17 "Wheel weight to be used later." 1 Quote Link to comment Share on other sites More sharing options...
omgvfr Posted April 17 Share Posted April 17 That piece looks like a sheared off drive dog. From the main or countershaft gears in your transmission. I’m used to seeing surface wear on these and issues with shifting into certain gears and getting good engagement. Having a broken off piece is something else. Do let us know… Quote Link to comment Share on other sites More sharing options...
WackenSS Posted April 17 Author Share Posted April 17 47 minutes ago, omgvfr said: That piece looks like a sheared off drive dog. From the main or countershaft gears in your transmission. I’m used to seeing surface wear on these and issues with shifting into certain gears and getting good engagement. Having a broken off piece is something else. Do let us know… It's not disassembled yet but it's been diagnosed as one of the dogs on any of the gears. I'll tell the story when it's in pieces as I hope it will tell me the story on wtf has happened. As of now it utterly mindboggling as nothing is out of order and transmission is working fine. It was found in the sump after I heard a noise dangerously close to big end rod bearing knock... Exciting times ahead 😬 Quote Link to comment Share on other sites More sharing options...
Member Contributer MBrane Posted April 18 Member Contributer Share Posted April 18 Yes those are gear dogs likely off of 6th gear as those engage 3rd. I found 3 of them in the sump of my '98 after losing 3rd completely. Lucky they didn't get jammed in the trans gears. Quote Link to comment Share on other sites More sharing options...
Member Contributer MBrane Posted April 18 Member Contributer Share Posted April 18 Those 3rd gear engagement dogs on the 6th gear flange for the shift fork are the weak link in the 5th gen trans. Been there done that. Everything else in there looked good so I buttoned it back up only to discover later that I likely had cracked heads as it was losing coolant, but no leaks. The bike has since been retired to parts. It was a good 80K. RIP. Quote Link to comment Share on other sites More sharing options...
Member Contributer Terry Posted April 18 Member Contributer Share Posted April 18 15 minutes ago, MBrane said: Yes those are gear dogs likely off of 6th gear as those engage 3rd. I found 3 of them in the sump of my '98 after losing 3rd completely. Lucky they didn't get jammed in the trans gears. Looks like rapid unplanned disassembly to me. 1 Quote Link to comment Share on other sites More sharing options...
Member Contributer MBrane Posted April 18 Member Contributer Share Posted April 18 1 minute ago, Terry said: Looks like rapid unplanned disassembly to me. Was on a big group ride on some awesome roads, and suddenly there was no 3rd on a downshift. The bike did fine for the rest of the ride other than having to go from 2nd to 4th. Dodged a bullet. 1 Quote Link to comment Share on other sites More sharing options...
Member Contributer Grum Posted April 18 Member Contributer Share Posted April 18 I'm amazed at the engineering of this project, kudos to the OP. But with all the added hp of a Supercharger surely wouldn't every component within the engine, pistons, crank, transmission, clutch etc potentially be stressed beyond its design capability? Just wondering! Quote Link to comment Share on other sites More sharing options...
WackenSS Posted April 18 Author Share Posted April 18 2 hours ago, Grum said: I'm amazed at the engineering of this project, kudos to the OP. But with all the added hp of a Supercharger surely wouldn't every component within the engine, pistons, crank, transmission, clutch etc potentially be stressed beyond its design capability? Just wondering! Yes most definitely! However the vfr is known for its over engineered everything - but doubling its power will expose every weak link. I'm not worried, its probably one of the most sold bike in its era so plenty of spares to be found. 1 Quote Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted April 18 Member Contributer Share Posted April 18 The RC46 crank case & major assemblies are taken directly from the RC45 which in final race trim was putting out 195rwhp @ 14K/rpm. The only major parts difference was the pistons & Ti conrods & the crank+cams being timed differently. The big bang RC45 crank is timed at 0 degrees, such that it acts like a pair of V-twins joined together. And the 2mm shorter stroke allowed for the higher race RPM. That setup creates huge loads, the VFR's 180 degree crank is much kinder to the cases & bearings. Due to the total lack of RC45 crank case spares, race teams use 5th gen crank cases with the swingarm pivot ground off. They then bolt straight in to RC45 frame and all RC45 innards just drop in. 5 Quote Link to comment Share on other sites More sharing options...
WackenSS Posted April 18 Author Share Posted April 18 8 hours ago, Mohawk said: The RC46 crank case & major assemblies are taken directly from the RC45 which in final race trim was putting out 195rwhp @ 14K/rpm. The only major parts difference was the pistons & Ti conrods & the crank+cams being timed differently. The big bang RC45 crank is timed at 0 degrees, such that it acts like a pair of V-twins joined together. And the 2mm shorter stroke allowed for the higher race RPM. That setup creates huge loads, the VFR's 180 degree crank is much kinder to the cases & bearings. Due to the total lack of RC45 crank case spares, race teams use 5th gen crank cases with the swingarm pivot ground off. They then bolt straight in to RC45 frame and all RC45 innards just drop in. Just love your History lessons Mohawk. Valuable info ❤️ Would you happen to know how the gears are designed? I know from somewhere the rc45 atleast was undercut. Ratio closer to the 5th gen than the 6th/8th gen? Quote Link to comment Share on other sites More sharing options...
WackenSS Posted April 18 Author Share Posted April 18 I'm kind of flabbergasted to hear multiple stories about the transmission issues here. Im sure theese are Na bikes yes? I have absolutely abused my bike for 30k km with 100% power increase in mind just making Shure of proper shifts before wot. Absolutely no hickups before and now that I'm building a map slowly I have transmission parts in my sump. Can't wait to see this with my own eyes! 1 Quote Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted April 18 Member Contributer Share Posted April 18 Well stock RC45 gears were used by non factory teams as normal with chain sprocket ratio changes only. Factory teams would have specific ratio boxes made to assist if WSBK rules allowed for that back in the day. But AFAIK they never had a cassette gearbox, so would have had to strip engine to change ratios !? Either way the boxes are strong. Stories of damaged gearboxes on RC46 VFR's are rare. Quote Link to comment Share on other sites More sharing options...
WackenSS Posted April 20 Author Share Posted April 20 We have all wondered how a vfr engine with forced induction takes this abuse right? Well at least I have! So to all those who have told me over the years that this is not going to last, the vfr can not handle this - you are wrong! No measurements have been done, I have just glanced over everything - season has started. This engine will be shelved waiting parts and getting ready for the next stage. A 17000km engine will be put in it's place. I don't have more time this week to tell the story but it will come 🙂 Have a good one guys - ride hard but mind your 3rd gear 😅 7 1 Quote Link to comment Share on other sites More sharing options...
WackenSS Posted Friday at 10:55 AM Author Share Posted Friday at 10:55 AM Update and the first drive story. I built a map usig RB sw and ran it for 3 sessions with no load over several rpms at max 20pst tps-ish and watched the rapidbike do its thing. Firstly it was way to rich in the lower department so the Powercommander numbers are not directly translatable. All the time watching the AFR/Lambda values, i managed to build a functioning "test" map for road use. I spent around 20 minutes on the road and god damn what a bike this has turned into! i have kept the ignition table from RB for now, as im not running it very hard and going for the 98oct ron with no ethanol. The closest bike i can think of for comparison is the response from the aprilia v4. Also the weigth loss is really noticeable!!! Brake upgrade is nice but not exceptional but that might change when pads ar seated properly. Suspension upgrades are mind blowing actually, but its just a first impression. A lot less dive and you can now feel the surface your riding on and that was not possible before! All in all, you dont need to buy a modern bike, just throw all that money at your old vfr 😂 Anyway, this all ended rather surprisingly in my driveway. On the last trip i noticed AFR 18, this while within my 20pst load run on the road. We have all seen those dyno runs right? Steady throttle and let it run up in the rpm? This is how i run while adapting the map. So got home, parked in my driveway, tok a 10minute break. Fired it up and there it is, a Big end bearing noise. Back on the table i took of my clutchcover to rule out any transmission issues, remowed the clutch and kept the input shaft still with my hand - noise still present... So yeah, i had severe detonation on this 18:1 afr run an thrashed a rod bearing was my tought. Thinking i could inspect a rod bearing i remowed the sump and found the piece of shift-dog. So i tore it down and found what you have seen in the picture. absolutely no rotating parts that can explain this. Also, my oil is kind of shiny so there are definitly something going on. i have not remowed the heads yet. Also, on this startup i had wierd lambda values and on my last startup i had no lambda values. I hope this is not going to be a LSU4.9 eater, that gets expensive really fast!!! I dont know when RB starts heating the probes but if this starts to early it will kill the sensors due to moisture. I have to do some investigation. Inspecting cylinders with a camera shows wet right cylinders, but fine left ones. Evidence of lambda issues... For all i know, the shift dog found in the sump can be vintage - anyones guess, 10 years? last season? 1999? Never had a transmission hickup. Also, I had major clutch slippage on my first and only 50% throttle. New Barnett, fully rebuilt clutch system, damn, and worse than ever! I only noticed it slightly before - like "was that a slipping clutch, hmm I have to test again, nothing ok." Now there is no doubt! Those 99lbs clutch springs are not really available as far as I can google. Anyone know where I can get them? Quote Link to comment Share on other sites More sharing options...
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