Samuelx Posted October 17, 2017 Share Posted October 17, 2017 WICKED!!! :D Link to comment Share on other sites More sharing options...
Member Contributer LangoPTC Posted October 18, 2017 Member Contributer Share Posted October 18, 2017 4 hours ago, RVFR said: WOW! I tip my hat to you sir... What he said. Link to comment Share on other sites More sharing options...
Member Contributer sfdownhill Posted October 18, 2017 Member Contributer Share Posted October 18, 2017 +2 on thank you for sharing that. Many of us have been curious what the 800 platform could achieve - there it is, in real molecules. Link to comment Share on other sites More sharing options...
Member Contributer MadScientist Posted October 18, 2017 Member Contributer Share Posted October 18, 2017 As many have said, fantastic job. Now how about you strip her clothes off so we can see all the hidden goodies ;) Unless, she's a shy one... Link to comment Share on other sites More sharing options...
WackenSS Posted October 18, 2017 Share Posted October 18, 2017 That is skills beyond anything I've seen before! Is this the roumored VFR938…?Sent fra min SM-N910F via Tapatalk Link to comment Share on other sites More sharing options...
Parkes Posted October 18, 2017 Share Posted October 18, 2017 Thankyou all. Yes this is what some may have heard of as the Parkes938. I have raced it for the previous 3 years in the isle of man. I managed to qualify 16th in the superbike race in the wet one year but dry results have failed to perform (it's still wild to ride). It makes 152hp now but the chassis is a work in progress (it's my own linkage, steering and suspension design on the front) and the rate of acceleration is still far behind that of the top guys. I have followed Michael Dunlop and co (very briefly); the rate of acceleration of their superbikes leaves me wondering if I had hit the kill switch! The engine has had to go through extensive modification to take the power (there is more available with different ports) I did all the machining myself but it has taken much trial and error. Fundamentally the thermal efficiency of the vfr are the limiting factor. A revised casting with alternative thicknesses and coolant passages is really needed but maybe a bit over the top. The aerodynamics were an interesting learning curve. Particularly the centre of pressure, beware of that beasty! 180mph was completely uncontrollable in a straight line with my first set of fairings. Cooling was another challenge, 6 water pump designs and serious ducting to the 3 radiators later I have it under control; only just! I'll have to work on that website as there's lots of interesting things that I'm sure would interest a lot of people. Everyone who has seen me race it has been very interested to see whats underneath too. Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted October 18, 2017 Share Posted October 18, 2017 6 minutes ago, Parkes said: Thankyou all. Yes this is what some may have heard of as the Parkes938. I have raced it for the previous 3 years in the isle of man. I managed to qualify 16th in the superbike race in the wet one year but dry results have failed to perform (it's still wild to ride). It makes 152hp now but the chassis is a work in progress (it's my own linkage, steering and suspension design on the front) and the rate of acceleration is still far behind that of the top guys. I have followed Michael Dunlop and co (very briefly); the rate of acceleration of their superbikes leaves me wondering if I had hit the kill switch! The engine has had to go through extensive modification to take the power (there is more available with different ports) I did all the machining myself but it has taken much trial and error. Fundamentally the thermal efficiency of the vfr are the limiting factor. A revised casting with alternative thicknesses and coolant passages is really needed but maybe a bit over the top. The aerodynamics were an interesting learning curve. Particularly the centre of pressure, beware of that beasty! 180mph was completely uncontrollable in a straight line with my first set of fairings. Cooling was another challenge, 6 water pump designs and serious ducting to the 3 radiators later I have it under control; only just! I'll have to work on that website as there's lots of interesting things that I'm sure would interest a lot of people. Everyone who has seen me race it has been very interested to see whats underneath too. As far as cylinder work goes, have you looked into sleeving or cylinder support systems? https://www.cylindersupportsystem.net/ https://www.goldeneaglemfg.com/index.php?main_page=page&id=1 And maybe switching to an electric water pump? Link to comment Share on other sites More sharing options...
Parkes Posted October 19, 2017 Share Posted October 19, 2017 Yes I machined and sleeved the bores (on many of these engines) and closed the deck due to the bores going oval from the localized heat on the thrust faces. Sleeves are a compromise; not ideal and not suitable for all engine layouts. But useful because they are cheap. Coatings are better as you can maximize the better thermal conductivity of the aluminium but over centre crank honing is a very specialist job to get a 20 micron tolerance. Many will take the job on; not many will give the perfect fit concentrically the job requires. I don't recommend electric water pumps for high load applications; but maybe with a good thermal management system with pressure and thermocouples all around the system it would be worthwhile. Otherwise the temperature fluctuation around the jackets will be sporadic and likely to induce accelerated wear. But anyway I'm sure people would like to talk about the exhausts this section of the forum set out to so I'll save the story for the website. Many thanks for your interest Link to comment Share on other sites More sharing options...
Member Contributer boOZZIE Posted October 19, 2017 Member Contributer Share Posted October 19, 2017 Yes the exhaust, why all the joins instead of bends? No judgement just curious Link to comment Share on other sites More sharing options...
jhenley17 Posted October 19, 2017 Share Posted October 19, 2017 Maybe Ti doesn't bend well? Seems like a lot, if not all, of the Ti systems I see, including GP bikes, are made that way. Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted October 20, 2017 Share Posted October 20, 2017 22 hours ago, jhenley17 said: Maybe Ti doesn't bend well? Seems like a lot, if not all, of the Ti systems I see, including GP bikes, are made that way. Sent from my iPhone using Tapatalk https://www.ebay.com/itm/2007-2008-07-08-Yamaha-YZF-R1-OEM-Titanium-Exhaust-Header-Pipes-/192263591575?hash=item2cc3cd9697:g:HjcAAOSwgIpZf80B&vxp=mtr Link to comment Share on other sites More sharing options...
jhenley17 Posted October 20, 2017 Share Posted October 20, 2017 Huh. I dunno, then.Sent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Member Contributer MadScientist Posted October 20, 2017 Member Contributer Share Posted October 20, 2017 Mandrel bent vs welded titanium tubing mostly has to do with the material wall thickness and alloy that you can source/afford and if your mandrel bender has the capability to work with it. If you are making 1000s copies of a titanium piece and have the tooling flexibility of a large manufacturer, then the task is much more feasible. There are also other issues with material springback that must be accounted for differently with Ti alloy vs steel tubing. I'm fairly certain that there is only one grade of Ti alloy that is even suitable for mandrel bending. Link to comment Share on other sites More sharing options...
RVFR Posted October 20, 2017 Share Posted October 20, 2017 Not very many folks have the ability to play with Ti. it's a fineky material that takes special handling to another level, It's easier and simple to just cut and weld. I'm still thinking of having Gabe make a Ti system for me, as Gabe has contacts with suppliers of Ti. interesting as it's not as expensive the way he goes about it as I thought, so who knows. Link to comment Share on other sites More sharing options...
Member Contributer boOZZIE Posted October 21, 2017 Member Contributer Share Posted October 21, 2017 4 hours ago, RVFR said: Not very many folks have the ability to play with Ti. it's a fineky material that takes special handling to another level, It's easier and simple to just cut and weld. I'm still thinking of having Gabe make a Ti system for me, as Gabe has contacts with suppliers of Ti. interesting as it's not as expensive the way he goes about it as I thought, so who knows. I had heard ti is a bit more prone to cracking. Not bend friendly lo, argh Jezz, if Gabe's going to offer a ti system even more praise to him with all the welds per system. Link to comment Share on other sites More sharing options...
RVFR Posted October 21, 2017 Share Posted October 21, 2017 Yea, as it is he is building up a Ti system for a GTR35 as we speak. which had me have him look into tubing bit with cost options. The materiel ain't that bad, it's the time putting it together that gets ya. Link to comment Share on other sites More sharing options...
WackenSS Posted October 21, 2017 Share Posted October 21, 2017 Yea, as it is he is building up a Ti system for a GTR35 as we speak. which had me have him look into tubing bit with cost options. The materiel ain't that bad, it's the time putting it together that gets ya. I could like a quote on a set of Ti headers after I know the difference in weight Sent fra min SM-N910F via Tapatalk Link to comment Share on other sites More sharing options...
RVFR Posted October 21, 2017 Share Posted October 21, 2017 LOL, you would huh ;) Link to comment Share on other sites More sharing options...
drrocka Posted October 22, 2017 Share Posted October 22, 2017 I made TBR aware that 5th gen after market exhausts have already been installed on 2014 VFR800. Their position is "The 1998-2001 header has not been tested by us on the 02-09 or the new 2014 model."We know what fits and how... this is a CYA response. If this re-release comes to be than hopefully some of our California brethren who purchase can swing by TBR in Santa Ana to show them the header installed on a 6th or 8th gen VFR800 so they can support the models.This morning's updated list:1.Rush2112 - Full w/ CF muffler please!2.JDMBird833.HighSideNZ - Headers4.mspence82 - Headers + (6th gen single muffler, black series, with a matched midpipe to the header)5.RRM - Headers6-9.CornerCarver - 4 sets, 1 with alloy can, 1 with carbon can and 2 sets of headers only10.aokman11.jim v12. I’d like to get in on this. You can put me down for headers only. Will need to do the custom midpipe work for my Staintunes thoughSent from my iPhone using Tapatalk Link to comment Share on other sites More sharing options...
Parkes Posted October 23, 2017 Share Posted October 23, 2017 The theory is consistent flow, as even the best mandrel benders reduce flow on bends due to slight crushing. In my opinion it's not as straight forward as that but in the process I have come across something quite interesting to the power curve (bit of a secret) I have come across early findings on this in tuning textbooks written 10 years ago but it is difficult to explain as I don't fully understand it, and nor did they then. I do know is that it isn't used in modern gas wave simulators as it isn't built into the algorithms. It's a bit of a secret among those who have played around with it I think, exhaust development is moving on quite quickly so I am sure they are aware of it and on close inspection I can see at least one motogp team who look like they have. Titanium is fairly easy to work with; the faces have to be perfectly flat for a fusion weld otherwise you risk over stressing the joint from the large weld and it will later crack but generally the ideal sizes are never available otherwise you need to commission £1000's of investment to get a batch made; particularly the tapered sections for the headers. All residual stress needs to be removed from a titanium system otherwise it will crack which normally means welding it between 10-15amps to avoid distortion. You will get through a huge amount of argon so it's worth having the right equipment as doing it in a small shed could put you to sleep for good. Link to comment Share on other sites More sharing options...
vfrtas Posted December 3, 2017 Share Posted December 3, 2017 I have a 99 50th anniversary and i am very impressed by this build best i have seen awesome. Link to comment Share on other sites More sharing options...
Member Contributer jim v Posted January 6, 2018 Member Contributer Share Posted January 6, 2018 Any update? should I look in the other thread? Link to comment Share on other sites More sharing options...
Parkes Posted January 19, 2018 Share Posted January 19, 2018 I have pretty much finished the website; hope you all enjoy it www.tparkes.co.uk Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted January 19, 2018 Member Contributer Share Posted January 19, 2018 on the site and bike If u think being stretchered off in a chopper was bad, try 2 hours in an ambulance with a crew only speaking Russian and/or Lithuanian.... But, it did not stop us doing what we enjoy.... Link to comment Share on other sites More sharing options...
Samuelx Posted January 19, 2018 Share Posted January 19, 2018 13 hours ago, Parkes said: I have pretty much finished the website; hope you all enjoy it www.tparkes.co.uk WOW!!! Where's the we're not worthy emoji??!!! Link to comment Share on other sites More sharing options...
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