blown engine r1200s

[gus]

Hi all
as some of you may know my engine blew at Brno during the closing stages off my last race. As i could see a hole in the top crankcase i assumed the motor had thrown a rod. It now looks like a big failure on the RHS. Could have been a valve or piston failure. Hard to tell as everything on that side is destroyed. Looks like a piece of piston or valve has got wedged between the crank and crankcase causing it to fracture and break the top engine case. i thought i had stopped the engine pretty quick. a lot of damage can be caused in so little time when the motor is at or near max RPM.
cylinder barrel

cylinder head

what left of the piston /valves found in exhaust and cylinder


hole in top of engine case

i have not stripped the left side yet . will tomorrow. although i think that side is ok head and piston wise.
all the best
Gus

[slparry]

yuck.... it always seems to be the rh pot

[Herb]

Bad news Gus. The joys of racing. Good luck with the rebuild.

[eyore]

Sorry to hear that. As Steve says, RHS was a bit of a bogey ,seem to remember hearing something about camchain /valves.

[tanneman]

Well gus, when you do something proper, you do it proper . Looks like a new engine. I wonder if the metal bits got in the bearings? Just a question, when is your next meeting?

[boxerscott]

bad luck, was it scary?

[Gromit]

Yowsas!! Proper job there, Gus, hope you get things sorted soon.

Not seen anything like that since my V65 Lario dropped a valve at 90mph, it produced similar carnage.

[gus]

Hi all
Yes , it's a proper mess!!
Luckily it happened on a straight , so it wasn't too scary. Unlike the bill for a new engine!
I doubt I will be able to attend my next round in Hungary , which is in September.
Monies earmarked for van hire, new tyres and travel/running expenses will be ploughed into a new engine with a few nice bits thrown in.
I will focus on next year now.
All the best
Gus

[Corvus]

All the best. Hope it all works out for you.

[tanneman]

You may want to consider getting another 1200S for spares. Problem is there is not a lot of them and few that ends up in a breakers yard. Can you buy any 1200 engine if you are going to fit some upgrade bits? You'll need the 1200S heads and thats about it I think.

[PBBoxer]

looks like exactly the same failure i had had, on my 12s a few years ago. Went at a ton whilst accelerating hard and spewed oil all over the place. RHS again and a hole through the top of the block.

Pillion wasnt best pleased


Good luck mate

[gus]

Hi Paul
Thanks. New motor will get lighter pistons and rods. Looking into valve options.
Tannerman
No money to get a spare 1200s. I would only use a few major bits anyway. Looking into different engines and costs involved to bring them to spec.
All the best
Gus

[PBBoxer]

Gus
Are there many options out there for road going 1200s motor tuning?

[Herb]

What are you allowed to do within the rules of your racing class?

[gus]

Gus
Are there many options out there for road going 1200s motor tuning?

Hi Paul
Depends on how far you want to go with it (or how deep are your pockets). For the road I found a full decent exhaust system, piper x air filter and a decent fuel controller (rapid box / power commander ) or a ecu map reflash(rexer) was enough to make the bike nice to ride and quick enough.
Lighter pistons and rods will give good engine response and also give the big ends a easier time if your exploring the upper rev range a lot. There is more that can be done but you then need to change a lot of other things to make the bike reliable. These mods would only be viable if your racing and need a more powerful bike to better your times.
Gus