When **** hits the fan
Update ....
So when I look at these couple pieces of cylinder wall...I notice the one piece had dark rust ish color at one side of the faults/fractures. All the other sides are grey like you would expect from broken iron. Got me thinking...
upon inspecting the carburetor......i found the throttle shaft bushing is shot on the cable/drivers side and wobbles around, a lot.. Maybe some of you remember me posting about a wondering idle after high rpm wot blasts? Well the idle would drop down, I'd chase it...adjusting speed/mix and changing spacer gaskets and finally ditched the spacer and it seemed to not do it anymore.
So I'm pondering.....
only 1 piston popped..
The piston closest to the leaky throttle shaft, no.5...
That one pistons cylinder wall looks like it may have cracked or had a fault 'coolant side' of wall, maybe it was there all the while or maybe the cylinder cracked when it lean spiked/pinged here and there....
Only one piston, out of 8 with ALL OTHERS SHOWING NO SIGN OF DETONATION., no pits, clean spots outside of quench areas etc...
I pride myself in my tuning ability, lack of failures of this type. Though I'm not perfect...but I'm starting to ponder that it wasnt directly lean jetting by itself, maybe helped or not... and maybe the cylinder wall just gave out due to...a crack, lean from the shaft leak... anything related.
Update ....
So when I look at these couple pieces of cylinder wall...I notice the one piece had dark rust ish color at one side of the faults/fractures. All the other sides are grey like you would expect from broken iron. Got me thinking...
upon inspecting the carburetor......i found the throttle shaft bushing is shot on the cable/drivers side and wobbles around, a lot.. Maybe some of you remember me posting about a wondering idle after high rpm wot blasts? Well the idle would drop down, I'd chase it...adjusting speed/mix and changing spacer gaskets and finally ditched the spacer and it seemed to not do it anymore.
So I'm pondering.....
only 1 piston popped..
The piston closest to the leaky throttle shaft, no.5...
That one pistons cylinder wall looks like it may have cracked or had a fault 'coolant side' of wall, maybe it was there all the while or maybe the cylinder cracked when it lean spiked/pinged here and there....
Only one piston, out of 8 with ALL OTHERS SHOWING NO SIGN OF DETONATION., no pits, clean spots outside of quench areas etc...
I pride myself in my tuning ability, lack of failures of this type. Though I'm not perfect...but I'm starting to ponder that it wasnt directly lean jetting by itself, maybe helped or not... and maybe the cylinder wall just gave out due to...a crack, lean from the shaft leak... anything related.
