Tweet
so i have a 3100 turbocharged with a stock bottom end. i broke a rod on 9psi with a gt3076r turbo. anyone break a rod before? first time for me and the third engine ive went thru.
-
Last edited by Jbrogan; 02-13-2011, 02:27 AM.
1996 Beretta
3100 SFI TURBO
T28 60 Trim Turbo at 9psi, Stage 1 turbo cam mms, lifter upgrade springs mms, P&P heads, ls6 Valve Springs, Ported exhaust manifolds, Hyperuetectic pistons SP, 3.29 trani, MSD 8.5 wires, open exhaust, Pulstar plugs, 3400 intake manifolds, ported TB, 36 lb/hr injectors, RCI Fuel cell, Walbro 255 pump, A/C Bypass, and much more.
13.1 @ 103 mph best in the 1/4 mile -
Yikes, guess you'll spend some$ on the next bottom end then eh? -
yea i guess so
1996 Beretta
3100 SFI TURBO
T28 60 Trim Turbo at 9psi, Stage 1 turbo cam mms, lifter upgrade springs mms, P&P heads, ls6 Valve Springs, Ported exhaust manifolds, Hyperuetectic pistons SP, 3.29 trani, MSD 8.5 wires, open exhaust, Pulstar plugs, 3400 intake manifolds, ported TB, 36 lb/hr injectors, RCI Fuel cell, Walbro 255 pump, A/C Bypass, and much more.
13.1 @ 103 mph best in the 1/4 mileComment
-
Frankly, the stocjk bottom end seems to be pretty durable and I haven't heard of many bent/broken rods or cranks on cars running reasonable boost. Youi may just be unlucky. Did you do any rod prep befoire using them - peening etc.?Comment
-
Where did it break first off?Comment
-
yea i am unlucky. i had a mechanic machine shop mount the pistons on the rods and check em thats bout it. ive never had a rod problem im wondering if i had detonation on that cylinder. i was getting on it and my air fuel dropped off to lean and it ran shitty so i let of and it ran shitty sounded like some backl firing and stalled. i looked under the car and had coolant running of the oil pan and coolant in the oil. cylinder 6 had a smashed spark plug and when i turn the motor over by hand u can hear the rod smack around.
1996 Beretta
3100 SFI TURBO
T28 60 Trim Turbo at 9psi, Stage 1 turbo cam mms, lifter upgrade springs mms, P&P heads, ls6 Valve Springs, Ported exhaust manifolds, Hyperuetectic pistons SP, 3.29 trani, MSD 8.5 wires, open exhaust, Pulstar plugs, 3400 intake manifolds, ported TB, 36 lb/hr injectors, RCI Fuel cell, Walbro 255 pump, A/C Bypass, and much more.
13.1 @ 103 mph best in the 1/4 mileComment
-
well that just sounds fucking lovely. well... up to a 3400 and run less boost and more HP, maybe lower the CR with RWD pistonsComment
-
Detonation will kill the strongest bottom end. If you make the rods stronger the crank will break. Make that stronger and the pistons will go. Make that stronger and the cap will go and so on and so on. Better tuning will solve your problems.1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
Because... I am, CANADIANComment
-
Are you sure its a rod ? Piston usually break way before rod, ask me how I know
Comment
-
Either way, carnage pics of both or ban-hammah!Originally posted by 90BlueZ View PostAre you sure its a rod ? Piston usually break way before rod, ask me how I know
-60v6's 2nd Jon M.
91 Black Lumina Z34-5 speed
92 Black Lumina Z34 5 speed (getting there, slowly... follow the progress here)
94 Red Ford Ranger 2WD-5 speed
Originally posted by Jay Leno
Comment
-
I agree, but that's gotta come from Betterthanyou....... Betterthanyou?Originally posted by pocket-rocket View PostEither way, carnage pics of both or ban-hammah!Comment
-
Pics or Ban? Sure I have no qualms about bans. I am sure brad and ben will do the same.1993 EXT. CAB, 3.4L V6 TBI, 5spd manual. Sonoma
1990 4Door, 3.2L V6 TBI, 5spd manual. 4X4. Trooper
Because... I am, CANADIANComment
-
ya im not sure if it detonated but im guessing thats what happened. never had the problem before and had the same tune for a long time.
1996 Beretta
3100 SFI TURBO
T28 60 Trim Turbo at 9psi, Stage 1 turbo cam mms, lifter upgrade springs mms, P&P heads, ls6 Valve Springs, Ported exhaust manifolds, Hyperuetectic pistons SP, 3.29 trani, MSD 8.5 wires, open exhaust, Pulstar plugs, 3400 intake manifolds, ported TB, 36 lb/hr injectors, RCI Fuel cell, Walbro 255 pump, A/C Bypass, and much more.
13.1 @ 103 mph best in the 1/4 mileComment
-
As in 3 motors blown long time?Comment
-
well first motor i melted a piston cuz im dumb and put some methanol in the gas that one lasted a year was all stock on 9 psi. the second motor i didnt even get to really run it long i got bad parts. i had my rods honed and they were not right so rod bearings went out immediately and the metal went all thru the motor and tore it up. so now im on the third motor 2500 miles in had no problems other than a exhaust gasket blowin out cuz 2 nuts fell off somehow. so its been a different problem each time. first time for this problem.
1996 Beretta
3100 SFI TURBO
T28 60 Trim Turbo at 9psi, Stage 1 turbo cam mms, lifter upgrade springs mms, P&P heads, ls6 Valve Springs, Ported exhaust manifolds, Hyperuetectic pistons SP, 3.29 trani, MSD 8.5 wires, open exhaust, Pulstar plugs, 3400 intake manifolds, ported TB, 36 lb/hr injectors, RCI Fuel cell, Walbro 255 pump, A/C Bypass, and much more.
13.1 @ 103 mph best in the 1/4 mileComment
Comment