| Author | Message | ||
     Stevenfrye |
So there I was trying my hardest to switch out the exhaust to my new race pipes on the. So during the tear down I found the previous owner had used dome carriage bolts to hold on the stock pipe and oil cooler. Well needless to say it's freaking loud like v rattle your teeth loud and a bit more spunk. But now she wants you stall at low rpm, and the check engine light comes intermittently. | ||
| Reepicheep |
Ow. Is there enough left to heli-coil back to the original (proper) threads? | ||
| Stevenfrye |
Nope just a mangled hole, I don't even understand how the shit stayed on the bike. Divine intervention the mechanical gods looked kindly upon me because I did manage to fix it, I filled in the holes and did a cryo redrilling of the mounts and all came out fine. | ||
| Reepicheep |
Filled the holes with what? Tig welded aluminum or something? Or was it in a steel bracket? (just curious...) | ||
| Stevenfrye |
filled the holes with stuff i call cermut 1/3 25 micron alum powder 1/3 ceramic dust 1/3 high temp jb weld and a touch of epoxy. fashioned two plugs and affixed to a clamp and exerted a tremendous amount of pressure from both sides of the hole (stock pipe mount under oil cooler)till cured at 24/48 hours then tested with hardness meter, then used dry ice to chill and drilled and threaded with helio threads. i had to do a cold fix on it didnt know how the heat from a fill would damage the case by warping. | ||
| Oldog |
Frye: Q what lead you to the metal ceramic jb weld mix, the install under pressure is interesting in that I guess you are forcing the material into the metals' pores.. I have machined JBweld and "Belzona" before with good result. what do the ceramic and additional metal bring to the party Vs the regular metal filled epoxies Like JBWeld? | ||
| Stevenfrye |
Well I wanted to keep it light with a limited amount of heat deformation being so close to exhaust, and yes fill pores and stress cracking from improper bolting, And the higher pressure ensure an extremely dense mixture. The chilling also causes the density to increase for in machining creates a smoother bore to tape and less material wasted. | ||
| Stevenfrye |
oops not tape but tap as in tap n die | ||
| Reepicheep |
Interesting! Let us know how it holds. That's a challenging application. |
