Leave it to Brit....

[AlisoBob]

[iggys-amsoil]

Ya Glen we all value what you have to say. Even us none climbers.

But no ones answered my Q.

[glen howell]

456

[M.F.D.B.]

So Glen, do you agree with me that the "cold" charge going into the motor is cooling and shrinking the piston??

[ellett]

Dustin, step me through your thermal shock theory.

[glen howell]

I would think that a 45 shot would go in to that area cold enough that it would do what we are seeing, It would shrink the piston enough to cause a hydraulic effect And cause a internal explosion by compresing it enough to break it and show the markings on the piston I think that I would move the nozzels, maybe to the transfers or to the crankcase, that we are seeing.Nuf said. Glen (TEAM GSS) NAHA#42 P/S Not bad for a 60 yr. old but of course I'm 70 now. All tho if you were up to jawbone on playday I was the only one over the big hill,Even the Nitrous bikes couldn't get over.

[M.F.D.B.]

Dustin, step me through your thermal shock theory.

Ok Dawn, here goes...

The only part of the cylinder, that the front (carb side) of the piston is in contact with, has a huge coolant area right behind it (prolly the largest surface area of coolant anywhere in the jug). The area where the older cylinders used to have a coolant fitting (on the newer cylinders you can still see the "pad" where it used to be plummed).

So, the rings transfer much of their heat to this "cool" part of the jug, pulling a large portion of heat out of the crown of the piston and subsequently, much of the skirt.

To add to this extra cooling is the ever present cooling effect from the intake fuel/air charge. You add these two things together and I bet this is a signifigantly cooler area then the rest of the piston. Cooler means smaller, as in less expansion, as in less friction, you get the point??

[M.F.D.B.]

Not bad for a 60 yr. old but of course I'm 70 now. All tho if you were up to jawbone on playday I was the only one over the big hill,Even the Nitrous bikes couldn't get over.

Number two on my list of "things to do before I die"....

SHAKE THIS BAD MOFO's HAND!! (then stick a beer in it!!)

[ellett]

Ok Dawn, here goes...

Cooler means smaller, as in less expansion, as in less friction, you get the point??

Where do the cracks come from? Piston slap caused by the shrunken piston?

[M.F.D.B.]

Where do the cracks come from? Piston slap caused by the shrunken piston?

Possibly, but I think more from the thermal stress...

[ou812]

This is getting a little dumb. a nitro bike like Glens is setup and runs as a constent, were as a gas motor with a nitros shot is not, it runs around a operating temp, then Brit hits it, it get a cold shock right at the intake skirt, then Brit shit his pants and lets off the button, now the piston goes back to normal. The more times Brit shits his pant , the more times the piston gets a cold shock it wasn't ment to. pretty simple stuff

[britincali]

^ Makes sense!

[M.F.D.B.]

This is getting a little dumb.

the more times the piston gets a cold shock it wasn't ment to. pretty simple stuff

First you say this is getting "dumb" then you state a simplified version of what I was saying??

[arleybeer40]

I think he fried it trying to start it again after the nitrous stuck on. If you think about it nitrous makes fuel more volitile and when the nos and fuel solenoids stuck on it filled the cases with the right amount of fuel and nos(wich is what makes for brits notorius backfires) that the piston on its downward stroke compress the mixture enough to ignite. boom blew the piston out causing the stress fractures in the skirt. As far as the bore goes BRIT sucks at air filter maintance.

[M.F.D.B.]

I think you guys are forgetting one very important point here. Unless you think the N2O is "spontaneously igniting" then no matter how "flooded" the motor is with Fuel/Oxy, the SPARK PLUG still isnt going to ignite the mix till the PROPER TIME, SO, unless he was able to kick the bike well enough for a combustion event to happen and then SIMULTANSOUSLY pop the bike in gear and dump the clutch (basically stopping the piston suddenly during its power stroke) then how is this situation going to crack a piston??

BTW a "choof" or "back fire" is when excess fuel/air mix (unburnt) is present in the EXHAUST SYSTEM and is ignited when the piston comes down on the power stroke dumping flash in the exhaust and igniting this excess unburnt mix. Non of which is going to hurt the piston...

[lewisclan]

Glen & team GSS is fricken bad ass