|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: titan]
#1249840
06/12/12 09:12 PM
06/12/12 09:12 PM
|
Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
|
Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
|
Quote:
Can The Stock Size Small End Of The Rod Be Bushed For The .990 Pins?
The pistons would need to be the same size but its
cheaper to just buy the chevy rods and turn the crank...
if you had the chevy pistons ... but if you need to buy
new pistons and rods and turn the crank then its
different
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: titan]
#1249842
06/13/12 12:13 AM
06/13/12 12:13 AM
|
Joined: Jan 2003
Posts: 75,071
U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,071
U.S.S.A.
|
Quote:
Can The Stock Size Small End Of The Rod Be Bushed For The .990 Pins?
Yes it could if there is a bushing out there otherwise you could make or modify some ?
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: Eric]
#1249844
06/13/12 01:11 AM
06/13/12 01:11 AM
|
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
jamesc
master
|
master
Joined: Jan 2003
Posts: 5,875
communist bloc of new jersey
|
Quote:
I don't have the pics on this puter...but a 440source rod put a nice hole in my 512...light car thru the traps at 7000k
for most people building engines these days is a real chore. it's always a struggle between what you can afford and getting quality parts/machining/assembly. not knocking any particular brand they can and have all failed. considering the damage they cause when they do fail i always try to bite the bullet and get the better quality parts which almost always have a better record pertaining to failures. this is true of most engine parts, just about anything failing at 7k has the potential to destroy the engine, your wallet and possibly your car. the sad part is today i don't think you can get a set of american forgings/finished rods for under $1000-1200. like i said i always liked the sportsmasters, not a top shelf rod but a quality american part at a reasonable price.
inexpensive parts can really be false economy
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: dogdays]
#1249845
06/13/12 12:49 PM
06/13/12 12:49 PM
|
Joined: Oct 2007
Posts: 4,209
New York
polyspheric
master
|
master
Joined: Oct 2007
Posts: 4,209
New York
|
True - the bolts are the point of failure.
Only a bad nitrous tune will buckle a rod unless it was a poor choice from square 1, and even then the piston may take all the hit.
In general terms the cross-sectional area of a bolt is proportionate to the square of its root diameter. I don't have the actual data, but it should be close to the pilot drill size:
3/8-24 .332"
7/16-20 .3906"
Based on these dimensions the 7/16" bolt is about 38% stronger (assuming equal execution).
Boffin Emeritus
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: polyspheric]
#1249846
06/13/12 01:38 PM
06/13/12 01:38 PM
|
Joined: Jul 2003
Posts: 1,212
Canton, Ohio
Crazy68Dart
pro stock
|
pro stock
Joined: Jul 2003
Posts: 1,212
Canton, Ohio
|
Since it is nearly impossible to get an American made rod (period) and at that for under a grand (if you have the money it is well spent, but most don't) should the questions be: - "Who sells the best Chinese rod?" - "Is the best Chinese rod better/worse than a reworked stock rod"? 
383, Hemi 4-Speed, AlterKtion, D60
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: cl440]
#1249848
06/13/12 02:25 PM
06/13/12 02:25 PM
|
Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
Moparnut426
I Live Here
|
I Live Here
Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
|
Quote:
Chances are a new "ready to go" connecting rod will still need to be inspected and resized by a competent machine shop. At 475 hp I would save some dough and send a good set of LY's to the machine shop to be inspected and sized. IMO 
Even thought I posted about the cost margine and rods, I do feel the LY rod is a good quality rod, accually any mopar rod from a 360 up to a 440 is a good rod, its been proven many times. Inspect them, shot peen and polish, can be done by you cheaply, but have them magged, and resize. Just have the machine shop do the work of resizing them, and pressing in the bolts.
I did a set of 340 rods by myself, Replaced and swedged new bushings in them, polished the side beams, and shot peened them, then I put a nice set of wave locks in them and as far as I know they are still in the SMF they went to.
I did them in college, and since you say your an engineer your obviously smart and good with your hands so Im sure you can also do all the work your self,ya just need to find a shop that will let ya use the machine
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: d-150]
#1249852
06/13/12 05:33 PM
06/13/12 05:33 PM
|
Joined: Jan 2003
Posts: 75,071
U.S.S.A.
JohnRR
I Win
|
I Win
Joined: Jan 2003
Posts: 75,071
U.S.S.A.
|
Quote:
explained in 440 source a rod is like bending a paperclip it gets weaker more its used.not saying the cat rods are any better, but they are brand new.they are speced out to 500hp
I'd run a refurbed LY to 500HP before a 5140 chinese I beam rod
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: JohnRR]
#1249853
06/13/12 06:01 PM
06/13/12 06:01 PM
|
Anonymous
Unregistered
|
Anonymous
Unregistered
|
I just recieved my first set of the 440 Source I beams for $269--They measured as close as any from anywhere and looked darn good to me and a 7 1/6ths wavelock ARP bolt is not going to fail in a 450 HP street engine --the weight was not too bad on them either--I am putting them in a 400 HP street engine with a hyd cam--Yep KB 237's are stupid heavy and these are a tad on the fat side weight wise but-- A 30-40 year old set of LY's Can't be as strong as these new units and when you figure the price diff it is crazy to me to use a 40 year old rod though I do it all the time when I find a good set, get bolts at the flea for 1/2 price/ machine them myself etc THEN they are a good deal for my application. Its a China world boys--I bet there is not a Mopar on this site that is 100% USA--you just can't build an American Muscle Engine all USA wish we could--points to some of the trouble we are in but.....I decided I am powerless to fix it and just want to keep on making a living so I have changed with the times.
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: Moparnut426]
#1249854
06/13/12 06:05 PM
06/13/12 06:05 PM
|
Joined: Mar 2009
Posts: 1,058
bigfork mn
dragram440
super stock
|
super stock
Joined: Mar 2009
Posts: 1,058
bigfork mn
|
Quote:
Like this.....
your telling me this is 100% rod failure? 500 h.p. or under. No other detonation or any other problems.
I had a LY rod twist like a pretzel in my mild 440 to. Should I blame the rod? I dont think that it was the real problem just the weakest link.
Last edited by dragram440; 06/13/12 06:08 PM.
67' charger 499 RB
10.57 at 127
|
|
|
Re: Inexpensive 5140 Conn. Rods. Yes Or No ?
[Re: dragram440]
#1249855
06/13/12 06:52 PM
06/13/12 06:52 PM
|
Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
Moparnut426
I Live Here
|
I Live Here
Joined: Mar 2007
Posts: 12,013
Finally a HUSKER again
|
Quote:
Quote:
Like this.....
your telling me this is 100% rod failure? 500 h.p. or under. No other detonation or any other problems.
I had a LY rod twist like a pretzel in my mild 440 to. Should I blame the rod? I dont think that it was the real problem just the weakest link.
No, its just a picture of a destroyed SIR eagle poop rod.
I completely understand what your saying.
|
|
|
|
|
