Re: carnage at the dyno
[Re: mopar dave]
#2022553
03/01/16 01:27 PM
03/01/16 01:27 PM
|
Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Bummer Dave.. I have been in the same boat with my Rampage.. it didnt blow up but did tear up the bearings and a little on the crank... good luck with it
|
|
|
Re: carnage at the dyno
[Re: mopar dave]
#2022558
03/01/16 01:36 PM
03/01/16 01:36 PM
|
Joined: Jan 2003
Posts: 14,515 So. Burlington, Vt.
fast68plymouth
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 14,515
So. Burlington, Vt.
|
That sucks for sure. Usually, if there is a wasted bearing and/or a darkened/blackened journal, that's what caused the failure. Why that happened in your case.......that's what you need to try and figure out.
My friends "good" stocker motor ate a rod bearing on the dyno last fall, and that's a motor that has been run for years, and been on the dyno many many times. The power was down just a tick and it wasn't repeating as good as it usually does, but that thing uses a Q-jet, and those can be fussy. We did a couple of carb swaps, seemed to be making some progress, and actually got to a point where it made the most it ever had. We took a break and went for lunch. After we came back and resumed testing the power was down about 15-20hp. The first pull after the motor has sat for a while is usually down a bit but not that much. Oil pressure seemed a little low after the pull. Loaded the motor to make another pull, TQ looked like it was way down....... And I just shut it off. I knew something had gone away. Pulled the filter and took it apart(system 1), saw some filings.....we were done.
I don't recall which rod bearing failed, but all the rest of the bearings looked perfect.
|
|
|
Re: carnage at the dyno
[Re: mopar dave]
#2022659
03/01/16 04:27 PM
03/01/16 04:27 PM
|
Joined: Nov 2004
Posts: 4,330 Lynchburg, VA
Leon441
master
|
master
Joined: Nov 2004
Posts: 4,330
Lynchburg, VA
|
Rod and main clearance is a balance of those clearances, the top end oiling and oil weight.
.0033 on the mains is fairly common. Then going .002 on the rod. With aluminum rods fine sense they grow. May have been to tight when considering it's fed from the main. Only #8 is fed from #5 main. Where as the middle journals are feeding two rods each. The rear main wasn't upside down was it? Look at the #5 main bearing.
Career best 8.02 @ 169 at 3050# and 10" tires small block power.
|
|
|
Re: carnage at the dyno
[Re: mopar dave]
#2022824
03/01/16 10:20 PM
03/01/16 10:20 PM
|
Joined: Oct 2004
Posts: 3,097 back in Georgia
dthemi
master
|
master
Joined: Oct 2004
Posts: 3,097
back in Georgia
|
Sorry man, that gives me a knot in my stomach to see. Hope something can get salvaged.
Like others said, next time use .003 at least on the rods. Better.005, than .002.
Last edited by dthemi; 03/01/16 10:23 PM.
|
|
|
Re: carnage at the dyno
[Re: mopar dave]
#2022856
03/01/16 11:06 PM
03/01/16 11:06 PM
|
Joined: Jan 2005
Posts: 12,424 Kalispell Mt.
HotRodDave
I Live Here
|
I Live Here
Joined: Jan 2005
Posts: 12,424
Kalispell Mt.
|
I been studying hard the oiling in my stroker I am building and it seems the full groove would help the rod bearings live longer because they have access to pressurized oil when the cylinder pressure is highest. The 1/2 groove only sends pressurized oil to the rod on the bottom half of the stroke. Weather or not that amounts to a hill of beans under dynamic conditions I could not tell you but it does seem odd they do it that way from the factory.
In order to keep more oil on the crank on mine I drilled smaller oil feed holes in the cam bearings as they are getting fed right off the oil going to the mains. When everything is done right in a SB oiling don't seem to be a big issue from what I have seen. I almost always use standard volume pumps and don't seem to have much issue getting enough pressure.
I am not causing global warming, I am just trying to hold off a impending Ice Age!
|
|
|
Re: carnage at the dyno
[Re: mopar dave]
#2022941
03/02/16 01:02 AM
03/02/16 01:02 AM
|
Joined: Jan 2003
Posts: 17,926 Akron, Ohio
ProSport
I Live Here
|
I Live Here
Joined: Jan 2003
Posts: 17,926
Akron, Ohio
|
Sorry to hear Dave, I know you were excited to get it running and try the TR eventually.
1970 Challenger, all aluminum 528 Hemi, HDK suspension, Tremec 5 speed manual
|
|
|
Re: carnage at the dyno
[Re: hemi-itis]
#2022943
03/02/16 01:05 AM
03/02/16 01:05 AM
|
Joined: Oct 2011
Posts: 3,036 bean town ....Ca
WHITEDART
master
|
master
Joined: Oct 2011
Posts: 3,036
bean town ....Ca
|
Man the is a real bummer. Hopefully the replacement isn't too painful
In the 8s N/A.with Brett miller W8's 5.07 at 133 at 2700lb
|
|
|
|
|