MotoGP 2013

[Flettner]

Why is it always assumed the " twostroke" has to be a loop scavenge type engine. Sure it's what we have ended up with by default ( when supercharging was banned ), It's sort of the best of what was around at the time. Move on, loop scavenge has problems that have only partly been solved by electronics ( EFI ). The exhaust port needs to move to the other end of the cylinder from the inlets.

[Mental Trousers]

How many engines would the 2-strokes be allowed compared to the 4-strokes?

Ask this guy,he only had to replace pistons and rings before a race and change the crank between meetings.And could do it in less than an hour.

Bit of a problem when engines have to last anything up to 40 or more sessions without the official seals being cracked.

[Flettner]

Bit of a problem when engines have to last anything up to 40 or more sessions without the official seals being cracked.

Same engine though.

[Drew]

Same engine though.

Not the same engine parts though. Be a bit hard to keep a two stroke going for 40 sessions, without taking the barrels off or splitting the cases.

[Mental Trousers]

Soon as the official seals are cracked it's deemed a new engine.

2.4.3.3 Engine Durability
2) The engines available for the exclusive use of each rider must be
marked and sealed by the Technical Director or staff prior to first use. It
is the Team’s obligation to register any new engine with the Technical
Director prior to use. Once registered and used for the first time,
engines may not be swapped between riders, even within the same
team. A new engine is deemed to be used when the motorcycle with
that engine crosses the transponder timing point at the pit lane exit.

3) The engines will be sealed (e.g. by means of wiring and
identification tabs, stickers, etc) so that:
a. the timing system is not accessible (e.g. the head cover must be
wired to the cylinder head),
b. the timing driving system is not accessible (e.g. the gear
train/chain cover is wired so that it cannot be removed),
c. the cylinder head and the cylinders block (if any) cannot be
removed from the engine (e.g. the cylinder head is wired to the
cylinders block and the cylinders block is wired to the engine
crankcase),
d. the crankcase cannot be opened (e.g. the crankcase halves are
wired together).

All the parts that are accessible without removing the sealing wiring can
be replaced. Breaking or removing the seal or wiring without supervision
by the Technical Director or staff will be deemed to be “engine
rebuilding” and engines with broken, tampered with or missing security
seals will be treated as a new engine in the allocation.

The exception to that

7) It will be possible to break the seals if all the following conditions
apply:
a) the machine is entered by a CRT team,
b) for the sole purpose of changing the gearbox and/or primary ratios,
on an engine design where seals need to be removed for internal
gearbox access,
c) under supervision of the Technical Director and staff, at a time and
place determined by the Technical Director.

[Flettner]

You win.

But as for me, I'm not interested in four stroke " road bikes " being raced in GP, might as well watch Super Bikes and must admit super sport 600 are exciting to watch.
I liked the fact that it was not only riding "wars" but development wars as well, prototype racing. Who would come up with the next best engine tech. Great leaps forward in the twostroke era ( engine ). BMEP's that went from around 100 to in the end 200 PSI with simple minimal rules. Not like now.
The twostroke has so much more to offer but I guess that's now going to be in other areas.

[Mental Trousers]

That's why I'd love to see the 1000cc four stroke rule dropped. Give people the option to use whatever engine they feel will do the job. After all, the most expensive part of a bike by a very large margin is the engine so giving people options to innovate their way around the price tag could only be a good thing.

[tail_end_charlie]

That's why I'd love to see the 1000cc four stroke rule dropped. Give people the option to use whatever engine they feel will do the job. After all, the most expensive part of a bike by a very large margin is the engine so giving people options to innovate their way around the price tag could only be a good thing.

Agreed, the whole concept of prototype racing should be to try something completely new/different and to push development not only on what has been proven, but also towards new, untried technologies.

[husaberg]

Soon as the official seals are cracked it's deemed a new engine.



The exception to that

How long actually do the four strokes Mgp engines have to run for???????????
remember the ol 500's used to have the rings changed to keep em sharp and that's what everyone else did.
from memory plus i have posted it (add link later)the factory maintenance schedule was not that intense even for the big bang 500's.

okay looked it up 1800km for the cranks but some stretched that to 2500km YZR500 180 bike.
LM's bike that was tested had cylinders on it that had done 7000km.

[Flettner]

Husaberg, it's no use, they have all got valves and cams stuck in their ears.

[tail_end_charlie]

Husaberg, it's no use, they have all got valves and cams stuck in their ears.

Ha ha ha, well that's no worse than ya'll looking through those rose colored sleeve valves.

[husaberg]

Ha ha ha, well that's no worse than ya'll looking through those rose colored sleeve valves.

oh i found it the "works" Yama's used to do 1000km out of piston.

[Oscar]

I just got some of my stuff back from my bro - a set of pistons and carbon fiber disks off of Checa's 1996 YZR500, and a KR3 expansion chamber autographed by King Kenny.

[Crasherfromwayback]

I just got some of my stuff back from my bro - a set of pistons and carbon fiber disks off of Checa's 1996 YZR500, and a KR3 expansion chamber autographed by King Kenny.

Stop it Oscar. Fuck off to Sepang.

[Oscar]

Stop it Oscar. Fuck off to Sepang.

"You must spread some.."

But, but, I only need about 1,258 parts and I'll have the whole bike...