The SOHC/4 World Tour is in under way.
0 Members and 2 Guests are viewing this topic.
nice mixture,post WW 2 frame half Zuendapp,half IZH with a Yam engine. great build.
Quote from: Terry in Australia on May 11, 2012, 02:33:15 AMHey that's a beautiful BMW race bike Buca, I'm playing with a R100RS project at the moment, tell me what you've done to achieve 85 BHP mate, I love my "Bavarian Murder Weapon", but I laso have a 2007 Triumph Rocket III, and the BMW feels a little bit underpowered in comparison? Cheers, Terry. Hi Terry, working lot to make that. Most important mod is longer stroke. Typical BMW 1000 cc cylinder dimensions are 94 x 70,6 mm. Mine is 93.43 x 72.6. I use forged flat top piston from auto racing program and machined con rods longer for 11mm and smaller bering. Stock is 48mm mine is 45mm . Con rods are carillo style H beam made from light aluminium alloy. Heads are R75 with biger intake valve. Must use smaler head chamber due to flat piston to get comression 10 to 1. Camshaft is 286 with 0.8 mm more lift. But stock R 90 S cam will do the same. I get these by chance and it is good. Take lots of weight from flywheel/clutch assembly. Allmost 2 kg. From crankshaft 0.5 kg minus. On piston/conrod 130 gramm less than stock. Dellorto carb 38mm. Reving up to 7200 but is good for 8000 safe on shifting. I get biger stroke on crank with offset machining for smaller bering diameter. For hill climb use 3.36 ratio that is 175 kmh on 7000 rpm 4th gear. For road racing 2.98 wich is top speed 215 kmh.
Hey that's a beautiful BMW race bike Buca, I'm playing with a R100RS project at the moment, tell me what you've done to achieve 85 BHP mate, I love my "Bavarian Murder Weapon", but I laso have a 2007 Triumph Rocket III, and the BMW feels a little bit underpowered in comparison? Cheers, Terry.
OK another for the wierd pile, not even sure these are a production bike or prototype someone knocked up in their backyard after a night on the piss. http://www.trademe.co.nz/a.aspx?id=463979442The Madera was MFG by Suzuki about the same time as Yamaha Virago and Honda Shadow V twins came out Xnavylfr(CHUCK)
Here wrap your head around this, A V-8 CB1500 (2x750)http://hondachopper.yuku.com/topic/50336/1975-8-cylinder-Honda-engine#.UYV9aEpNXSgXnavylfr(CHUCK)