Bosch_man, the nitrous system on Rods engine did EXACTLY what it was supposed to do but you misunderstand what that was and how it works slightly though with what you are saying about it being a solid hit of 200bhp, its NOTHING of the sort, its still progressively controlled and builds to that peak without any excessive shock loads, the difference is simply that the amount it builds to now is higher, and that once there it holds it as long as its asked to do so without relent.

When i spoke to rod about the system and how it would work i explained to him the sort of increases in torque and BHP he could expert to cleanly get without detonation problems if it was mapped correctly (with mark on the case Rod was obviously rightly confident on that proviso).

I said to Rod that i had one concern, and one concern only, and that was wether or not the bottom end was capable of taking the power, i said that wasnt something i can judge as im not the person who builds his engines.
He informed me mark was very confident about the strength of the Rods and Pistons and Crank and that hence they werent worried about it, although of course im sure they were still aware of the possibility that pushing the envolope this far is NOT childs play.

Im not aware of anyone else who has ever produced enough torque from a YB to rip the bearing tunnel in two before, and i guess that previous to this neither had Mark or anyone else, ive seen these sorts of failures on blocks of engines before but only as a result of a crank or bearing failure first normally, never the actual block giving way while everything else was still working perfectly, so none of us had any way of knowing how close to the physical limits of the block Rod was, like most things in engineering the only way to find a limit is to pass it!

I was asked at the passionford meet tonight by someone if i felt responsible for the failure as it happened after the system i suggested to Rod was used, my answer was that i felt partly responsible for the torque produced but that the effects of that torque were not my responsibilty.
If Rod and Mark didnt use that nitrous system to get the extra power, then they would have found another way to get it, such as a bigger turbo for example, and they then would have still had the exactly the same failure of course, the nitrous didnt kill the engine, the thing that killed the engine was how much torque Mark and Rod were prepared to ask the block to cope with, all i did was help them achieve that torque that the required in the first place!

One thing i guess none of us will ever know is exactly how much power it was actually producing when it failed, but my expierence of nitrous would lead me to believe its more than mark or Rod believe it was, and i told Rod that from the outset.
I would imagine the nitrous system they had was actually producing the lions share of 300bhp, despite them referring to it as a "200bhp shot" as those numbers are based on a different setup entirely and are also an at the wheels figure anyway.
Ive NEVER had any engine that ive nitrous produce less @ the wheels than the "quoted amount" so ive no reason to believe that mark did either.