400 BB Piston on rod backward
#1282023
08/09/12 03:33 PM
08/09/12 03:33 PM
|
Joined: Jan 2003
Posts: 3,449
Gateway to the West.
hemi_harvester
OP
master
|
OP
master
Joined: Jan 2003
Posts: 3,449
Gateway to the West.
|
I was putting my 400 together and noticed one of the pistions in on the rod backwards will this cause oiling problems ? the bottom end was balanced and I can't turn it in the bore because the pistons are cut for valve reliefs.
There comes a time in life, when you walk away from all the drama & people who create it. You surround yourself with people who make you laugh, forget the bad, and focus on the good.
|
|
|
Re: 400 BB Piston on rod backward
[Re: JohnRR]
#1282025
08/09/12 04:26 PM
08/09/12 04:26 PM
|
Joined: Jul 2005
Posts: 11,632
SHELBY TWP,,MICHIGAN
72N96RR
I LOVE WEDGIES
|
I LOVE WEDGIES
Joined: Jul 2005
Posts: 11,632
SHELBY TWP,,MICHIGAN
|
1972 Road Runner / GTX 440 4spd Dana 3.54 Just about to turn 26K original miles..
A boat, a GMC truck, some Craftsman Tools, LOTS of Zombie Protection, and a few Goldfish..
If you love someone set them free..
If they come back it means nobody else wanted them either..!!
|
|
|
Re: 400 BB Piston on rod backward
[Re: hemi_harvester]
#1282026
08/09/12 05:17 PM
08/09/12 05:17 PM
|
Joined: Mar 2003
Posts: 4,848
Memphis
HemiRick
master
|
master
Joined: Mar 2003
Posts: 4,848
Memphis
|
It must be fixed the rod bearing is offset for crank fillet. I.E. Rod must go on crank right way.
Take care,
Rick
68 Coronet R/T 440 & 68 Charger 528 Hemi,and 5 Challengers! 6 cyl, 318, 360, 383, 451
|
|
|
Re: 400 BB Piston on rod backward
[Re: 72N96RR]
#1282027
08/09/12 05:18 PM
08/09/12 05:18 PM
|
Joined: Mar 2005
Posts: 862
Iowa State fan
kilroy
super stock
|
super stock
Joined: Mar 2005
Posts: 862
Iowa State fan
|
I remember reading something about Super Stock racers back in the day would reverse the pistons for something in the way of power.
But if its balanced, simply turning the piston on the rod wont have any effect on the balance.
1973 Charger, former SE, former auto
I'm not trying to be difficult, it comes naturally....
|
|
|
Re: 400 BB Piston on rod backward
[Re: kilroy]
#1282028
08/09/12 05:23 PM
08/09/12 05:23 PM
|
Joined: Jan 2003
Posts: 3,449
Gateway to the West.
hemi_harvester
OP
master
|
OP
master
Joined: Jan 2003
Posts: 3,449
Gateway to the West.
|
I think the SS racers actully switched the pistons from one side of the motor to the other like 1 for 2 and 2 for 1 etc I heard this gave a crank ratio oe something but caused piston slap.  I can't turn mine because my piston only goes in one way..
There comes a time in life, when you walk away from all the drama & people who create it. You surround yourself with people who make you laugh, forget the bad, and focus on the good.
|
|
|
Re: 400 BB Piston on rod backward
[Re: hemi_harvester]
#1282031
08/09/12 06:57 PM
08/09/12 06:57 PM
|
Joined: Jan 2003
Posts: 25,951
Rio Linda, CA
John_Kunkel
Too Many Posts
|
Too Many Posts
Joined: Jan 2003
Posts: 25,951
Rio Linda, CA
|
I can't remember the last time I installed a stock piston in the original position, I always turn them around for a little more power at the cost of almost imperceptible rattle.
The INTERNET, the MISinformation superhighway
|
|
|
Re: 400 BB Piston on rod backward
[Re: John_Kunkel]
#1282032
08/09/12 07:10 PM
08/09/12 07:10 PM
|
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
70Cuda383
Too Many Posts
|
Too Many Posts
Joined: Oct 2003
Posts: 21,345
Marysville, O-H-I-O
|
If they're floating pistons with spiro locks, flip it yourself and get a new lock. If you had original pistons cut for valve reliefs and they're pressed fit, take it back to the shop and have them press it out and flip it.
Hope they didn't cut the relief upside down and now you'll have one piston offset different than the rest... But if so, it won't hurt anything (as said, an old speed trick was to flip them), just wouldn't be exactly like the other 7
**Photobucket sucks**
|
|
|
Re: 400 BB Piston on rod backward
[Re: 70Cuda383]
#1282033
08/09/12 07:21 PM
08/09/12 07:21 PM
|
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
|
Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
|
IF you do decide to flip the rod call your machine shop & see if they have the special fixture that has an ear that with the rod/piston assy on its' side it goes under the rod small end to support the load so the piston ain't destroyed while pressing the pin back out. The balance stays the same, the oil clearance stays the same, with todays' bearings the squirt hole is no longer functional. I believe it comes down to if there is a bearing chamfer issue or not. EDIT not sure about bearing offset
Last edited by RapidRobert; 08/09/12 07:39 PM.
live every 24 hour block of time like it's your last day on earth
|
|
|
Re: 400 BB Piston on rod backward
[Re: RapidRobert]
#1282034
08/09/12 08:37 PM
08/09/12 08:37 PM
|
Joined: Aug 2003
Posts: 12,291
Kent, Wa
340SHORTY
Truck Nut
|
Truck Nut
Joined: Aug 2003
Posts: 12,291
Kent, Wa
|
You have 3 choices.
! Install it and hope nothing goes wrong.
@ Have the piston installed on the rod the other way.
3 Have the rod installed in the piston the other way.
I am truckless..
|
|
|
|
|
It won't but it will knock or slap if the pin is offset 
