CMB .45

[ids987]

As it's Friday, I thought I'd give you a laugh at my expense. My (former) CMB 45 at the end of a recent race. Anyone else managed to do this with a steel rod ?

Ian

 

[Ken Retallick]

Ahh the ol 'threw a leg out of bed' trick. Ive seen a Mac 84 do that, and a Zenoah.

My Evo 45 split in half, just above the mounts, lasted 6 years of racing tho.

 

[Richard Dahlheimer]

Ahh the ol 'threw a leg out of bed' trick. Ive seen a Mac 84 do that, and a Zenoah.
My Evo 45 split in half, just above the mounts, lasted 6 years of racing tho.

Ouch! Keep that one in the tool box, for a real conversation piece. lol Richard D

 

[Norm Doerr]

Rod stress

How Many Gallons until it let go?

Norm Doerr

 

[carlnoki]

i did one of those with the Original CMB 21 side exhaust that i had in a Oval Master when we were stationed in Arizona QUITE a few years ago. Went like hell then the dreaded SILENCE,,,,,,,,,,,,,,,,,,,,,,,,,, :lol:

carl

 

[Don Ferrette]

i did one of those with the Original CMB 21 side exhaust that i had in a Oval Master when we were stationed in Arizona QUITE a few years ago. Went like hell then the dreaded SILENCE,,,,,,,,,,,,,,,,,,,,,,,,,, :lol:
carl

They're always the fastest just before they blow up.

 

[ids987]

Rod stress
How Many Gallons until it let go?

Norm Doerr

The crank and rod assembly were pretty new - due to the original crank having the large pin, and developing splits in both bobbins. I couldn't get crank spares, so I ended up buying the whole assembly early last year.

So the rod probably only had a couple of hours on it - if that. It's unfair to look at it that way though, as there were external factors involved. The boat went airborne during a race, and landed bottom up. I can't decide whether it was caused by overrevving (during the airborne period), or whether it took a drink when it landed. I couldn't see any signs of water when I opened it. Plenty of "piston confetti" when I took the backplate off though. The skirt of the piston was smashed all the way round. The hardest part so far was getting the crankshaft out (bearing in mind that the liner wouldn't move very far). The crankshaft and pin survived. I'm debating whether to cut the liner out, JB Weld the case, and rebuild with new rod, piston, liner and bearings....

Ian

 

[Dr Hydro]

DUDE! I would clean up the hole and put plexiglass over it. Tell people it is an inspection port.

 

[ids987]

DUDE! I would clean up the hole and put plexiglass over it. Tell people it is an inspection port.

It's an idea.....