Lionel Posted May 22, 2015 Share Posted May 22, 2015 Hi has anyone ever had there cams cut to stage 2 and put in high compression pistons as well as gas flowed the head for v.f.r 1200 f.d. if so please give feedback as well as advice. Thanks Quote Link to comment Share on other sites More sharing options...
Member Contributer 2FAST4U Posted May 22, 2015 Member Contributer Share Posted May 22, 2015 Your bike's compression ratio is 12:1 (which is already high). If you're serious about having some even higher compression pistons installed, as well as porting and polishing the heads, and having somebody grind you some hotter cams, you're probably going to need a full exhaust, a reflashed ECU, and intake work done as well. I seriously doubt you'll find someone (especially where you live) that has the ability to do that kind of work on a VFR1200 DCT. You may want to start looking for another bike. Quote Link to comment Share on other sites More sharing options...
Member Contributer Dutchy Posted May 22, 2015 Member Contributer Share Posted May 22, 2015 Learn German and then go here http://www.kainzinger.com/vfr1200/honda-vfr-1200-tuningbereich/vfr-1200-tuning-mit-motoreingriff/index.html#837724a1090d3fc05 Bring ein grosse Menge Geld mit.... Quote Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted May 22, 2015 Member Contributer Share Posted May 22, 2015 Not heard of anyone doing it, but VFR12 is 81mm bore as STD, if Honda have kept to their tried & true 17mm wrist pin, then CRF250 or CBR250 big bore kits with 82-84mm bore pistons could be used. I will assume if the liner tech is MMR like most others then you should be able to squeeze a 2mm over bore, but beyond that you will need to go up to 86mm to completely remove the MMR & replace the cylinder wall with Nikasil or equivalent. That would only be possible if there was enough wall thickness left ! Quote Link to comment Share on other sites More sharing options...
Member Contributer Mohawk Posted May 22, 2015 Member Contributer Share Posted May 22, 2015 No standard bike has a compression ratio of 12:1, that is a static compression which no engine used in bikes ever has, as cam overlap loses compression, so dynamic compression ratio is what you need to worry about, on standard pump gas, the max is around 8:1 dynamic, on super that can be taken to 9:1 ish. You can read some info here http://www.visordown.com/workshop/understanding-compression-ratios/15453.html Quote Link to comment Share on other sites More sharing options...
Member Contributer 2FAST4U Posted May 22, 2015 Member Contributer Share Posted May 22, 2015 I'm going by the universally accepted (and published) compression ratio. For the current CBR1000RR, it's 12.3:1. On my bike, it's 11.6:1. Quote Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted May 23, 2015 Share Posted May 23, 2015 You should message dynajohn Quote Link to comment Share on other sites More sharing options...
gloryracing Posted June 12, 2015 Share Posted June 12, 2015 why would you want to incur such effort and expense? Quote Link to comment Share on other sites More sharing options...
CandyRedRC46 Posted June 14, 2015 Share Posted June 14, 2015 If you have to ask, you'll never know. Sent from my A0001 using Tapatalk Quote Link to comment Share on other sites More sharing options...
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