Scary day tomorrow

[adithorp]

The Fury is all loaded up to go for a rolling road tuning session tomorrow.

The new engine is still an 06 R1 but a bit fettled. Lightned/balanced crank and rods, ported and polished head (slight skim as well) and pretty hot cam. It came from (originally) Virgin Yamaha BSB team and is built to run to 18000rpm, so should be safe at stock 13750. Trouble is it's stood in the corner of my workshop for 2 years and was a bit tight when I put it in, so the RR could be a nervous day.

It run/starts great and goes like poo off a shovel when you boot it but coughs a splutters on light throttle/low revs and stalls when you pull up. Hopefully we'll get it ironed out. In full race spec' it (allegedly) made over 210bhp on the engine dyno but its a bit downgraded now (not got the silly-expensive charging system that only works over 6000rpm for instance) but the biggest change is the rev range. The guy I got it from claimed 190+ from it in his track bike. I'll be happy if I get that... or more.

If it all goes tits -up I'll just have to pull it out in bits and refit the old one.

[sjmatthews]

Sounds interesting. Good luck for tomorrow.

Make sure it's ready for Stoneleigh

[adithorp]

If it doesn't break tomorrow, I'm planning a track day at Blyton on the 21st to try and break it. If that doesn't happen (the break) then it'll be at Stoneleigh. If it does break on either then the old motor is going back in and it'll be at Stoneleigh...

I'm being a pessimist because I've broken the golden rule (If it ain't broke, don't fix it) so I'm expecting retribution of some sort. On the plus side it was lighting up the rears in a straight line in 3rd when "running rough" so life may be exciting when it's running well.

[jeffw]

good luck Adi....lets hope you don't have to use 18K to get the power lol.

[adithorp]

Well it's still running. First power run makes me wince but love to hear it going full chat after that.

A bit disappointed though... there's a huge 1.2bhp missing from what was predicted.

Made just shy of 190bhp at 188.8. Did 1/2 dozen power runs at the end and they all came out consistent, over 188. The old engine made 170. Yamaha claim 181 standard but inc' 10 from ram air (and it seems a +10 fiddle factor, as 160 seems to be a common bike dyno resut)
Torque was 125Nm. Standard is claimed at 100Nm (inc fiddle factor?) so well happy with that (and explains the spinning wheels).

I suspect the exhaust and air box are holding it back a bit and it was set to run on normal unleaded (don't want the hassle of searching for v-power) so there may be a bit there.

Sorry, no video. I couldn't find my camera last night but it turned up today in the car... with a flat battery.

but... It's still running. Just need to book a track day and see if I can break it there.

[jeffw]

Well done, you must be pleased with that......Lee might be looking for an engine

[adithorp]

I might have plans for the old one... little bit of forced induction maybe.

[jeffw]

Welcome to my world

[RobMsport]

Well it's still running. First power run makes me wince but love to hear it going full chat after that.

A bit disappointed though... there's a huge 1.2bhp missing from what was predicted.

Made just shy of 190bhp at 188.8. Did 1/2 dozen power runs at the end and they all came out consistent, over 188. The old engine made 170. Yamaha claim 181 standard but inc' 10 from ram air (and it seems a +10 fiddle factor, as 160 seems to be a common bike dyno resut)
Torque was 125Nm. Standard is claimed at 100Nm (inc fiddle factor?) so well happy with that (and explains the spinning wheels).

I suspect the exhaust and air box are holding it back a bit and it was set to run on normal unleaded (don't want the hassle of searching for v-power) so there may be a bit there.

Sorry, no video. I couldn't find my camera last night but it turned up today in the car... with a flat battery.

but... It's still running. Just need to book a track day and see if I can break it there.

I'm not convinced we get any '' ram '' air at the sppeds we travel , I discussed this with Paul Dunnell when planning my cold air supply and whether making a bigger scoop at the front , to increase pressure into the 4 inch pipe . He actually wanted me to fit a 6 inch pipe but even with the huge airbox I made , there was no space for one. He insisted that I would gain (or lose the available) 8 to 10 bhp via the volume (hence 6 inch pipe) and cold air , rather than any small ram effect at our speeds.

[adithorp]

Niether do I. Yamaha claim the 10bhp ram air effect but the bike does 198mph where they might get some. Then again as someone pointed out to me "Stick your head out a car window at 100mph, open your mouth and then tell me there's no effect". If having a smooth feed pipe instead of a conveluted one has an effect then surely shove in the air in at +100mph instead of just sucking it will as well. Most measurable improvements tend to be an accumulation of MARGINAL gains not one or two big ones.

However just to play the game and in the best traditions of pub bragging...

By Yamaha's method. I've got 190+ 10 ram air + random 10 to out do Suzuki/Honda (though maybe they do achieve it using special fuel and O2 rich air fed from a freezer) +210bhp! So with all that, the tyres filled with helium, all fluids at min', etc and the resultant weight rounded down (and no driver/occupants), I recon I've got over 500bhp/ton !

I'm starting to like this way of thinking... Now if I remove the wipers, roll bar and mirrors, tape up the grill and inflate the tyres to max presure, I put a special economy map in the ECU... it does 60mpg as well!