is there any reason that a busa engien must be fitted at its 'natural' angle as per a bike install? the reason i ask is because my engine bay (riot) has limited space and if i can mount the motor so that the throttle bodies are nearly horizontal it makes like a lot easier.

if the engine is dry sumped does anyone who has taken a hayabusa engine apart know of any specific reason why there could be problems?

I'd suspect at such an angle you would have problems with oil drain from the cams, take the cam covers off and see how oil is returned to the sump, I know you're dry sumping, but it still needs to return from the top end.

In addition to the top end drainage, where's the dry sump pump going to scavenge the oil from? This might be a problem.

thanks for the comments guys.

With regards to the cams, I dont think there is an issue. Oil drains from the timing chain end of the cam cover and when the motor is in a bike the exhaust cam sits lower than the intake cam so oil would drain predominently over this sprocket.

The drain pattern from the cams would change (cam draining would now be over the exhaust sprocket) when the driver is pulling a wheely as this would result in engine tilt to a similar inclination as what I'm proposing. I suppose under these conditions that oil collects elsewhere in the motor but wheelies are short term compared to fitting the motor at this angle and trapped oil would return when the bike got back on two wheels.

Clearly, as the gearbox would now be the lowest point of the entire engine/box assembly, this would be an ideal place to scavenge from.

I just had a good chat with a very helpful chap called Paul at Powertec who had a look at a diss-assembled busa engine. He says that there are several places where oil may not drain properly from although he couldn't see any reason that holes could not be drilled etc to alleviate this. He also said however, that in the engines they build (which sit at the normal inclination and are dry sumped as well), that they still fit baffle plates to prevent excess oil flowing around to places they dont want it e.g clutch