- Joined
- May 28, 2001
In the FWIW dept:
I recently commented on a set of Bosch 160's [0280 150 846]I flow tested, that leaked at the body/top crimp.[6 of the 8]. This same racer got another set, put them in, and WALA, 4 of the 8 leaked at first prime. [AIRC, I had flowed these, and condemned them, some 2 yrs ago.] This recent set, is at least 3 sets I've found, doing this.
He thot he had o'ring failure. Nope.
A SWAG as to what's going on:
I cut one of his leakers open on the lathe. I found no seal device between the metal body and the plastic top, other than the crimp.
Possible causes??
**High operating pressures, combined with pressure spikes, for literally millions of "hits", is stretching the metal case. [Some of the alky racers are running 70+psi base pressures, + >30psi boost]
** Millions of heat/cool cycles cause expansion differentials between the plastic and the metal.
I did not heat the injs when I did the tests, so I haven't confirmed the heat idea. However, I did put 1 in the vise, and could wiggle the body by hand. I gripped the body w/ a pipe wrench, and it freely rotated...
Certainly not ISO 2012 tests, but close!!
I may put the remaining injs in the bench, heat them w/ a heat gun, and see what happens.
I recently commented on a set of Bosch 160's [0280 150 846]I flow tested, that leaked at the body/top crimp.[6 of the 8]. This same racer got another set, put them in, and WALA, 4 of the 8 leaked at first prime. [AIRC, I had flowed these, and condemned them, some 2 yrs ago.] This recent set, is at least 3 sets I've found, doing this.
He thot he had o'ring failure. Nope.
A SWAG as to what's going on:
I cut one of his leakers open on the lathe. I found no seal device between the metal body and the plastic top, other than the crimp.
Possible causes??
**High operating pressures, combined with pressure spikes, for literally millions of "hits", is stretching the metal case. [Some of the alky racers are running 70+psi base pressures, + >30psi boost]
** Millions of heat/cool cycles cause expansion differentials between the plastic and the metal.
I did not heat the injs when I did the tests, so I haven't confirmed the heat idea. However, I did put 1 in the vise, and could wiggle the body by hand. I gripped the body w/ a pipe wrench, and it freely rotated...
Certainly not ISO 2012 tests, but close!!
I may put the remaining injs in the bench, heat them w/ a heat gun, and see what happens.
