manley h beam failure
Mar 10, 2012, 04:52 PM
#33
Evolving Member
Thread Starter
iTrader: (1)
Join Date: Jun 2007
Location: Melbourne, Australia
Posts: 281
Likes: 0
Received 0 Likes
on
0 Posts
In all honesty you should of done that yourself when finding / setting rod bearing clearances. sounds like you didn't measure anything yourself?
who set the clearances or provided what bearing thicknesses to use for your build? machine shop? if so it is there job to assure its good with proper measuring tools, micrometers, dial bore gauges, etc.
Its required to measure the Inner diameter of the rod caps tightened to spec in order to know/choose proper bearing thickness required to meet your personal specifications for your engines final clearance assembly.
who set the clearances or provided what bearing thicknesses to use for your build? machine shop? if so it is there job to assure its good with proper measuring tools, micrometers, dial bore gauges, etc.
Its required to measure the Inner diameter of the rod caps tightened to spec in order to know/choose proper bearing thickness required to meet your personal specifications for your engines final clearance assembly.
either way it's not right because even the paper that comes with it says they have been pre torqued to 60ftlb from factory. it's easy to throw the blame on the user, just wait till you finish the engine you're building when you know you measured everything and it was all correct, then it blows up with no sign and tell me how you feel when the internets starts pointing fingers at you lol.
I will admit the only thing I did wrong was trust that torque specs manley give would get you in the ball park for stretch, there are people who say using the torque values gets them within .005 of stretch when measuring. But like i said before, the rod bolts didn't back out so it didn't die from under stretch, and I really doubt I went past the elastic modulus of the bolt, if it did then the was a flaw in the bolt.
Last edited by burnzy; Mar 10, 2012 at 04:59 PM.
Mar 10, 2012, 04:59 PM
#34
huh? i'm not expecting manley to torque my rods for me, of course I checked clearances etc. what i'm saying is that they're meant to be torqued from factory just so they can hone the big end right??
either way it's not right because even the paper that comes with it says they have been pre torqued to 60ftlb from factory.
either way it's not right because even the paper that comes with it says they have been pre torqued to 60ftlb from factory.
was their lube on the loose bolts? if so id say that would be a good sign/way to tell it was checked..
atleast now you're locked & loaded with new information and your next build should last much much longer.
Mar 10, 2012, 05:05 PM
#35
Evolving Member
Thread Starter
iTrader: (1)
Join Date: Jun 2007
Location: Melbourne, Australia
Posts: 281
Likes: 0
Received 0 Likes
on
0 Posts
all my other builds are running fine lol. just my luck my own engine blows. there was no inspection sheet with mine. there was no lube on the bolts either, not sure why but manley uses arp lube with turbo tuffs and 30 weight oil with h beams...
Mar 10, 2012, 05:32 PM
#39
Mar 10, 2012, 06:12 PM
#42
same here. last time i changed a waterpump on my car i forgot to double check the torque on the tensioner pulley for the timing belt (making the wrench click twice), and just because i didnt confirm it i went down 1 hr later and ripped the entire car apart again just to redo it and have the wrench click twice on that bolt LOL.
Mar 10, 2012, 06:20 PM
#43
same here. last time i changed a waterpump on my car i forgot to double check the torque on the tensioner pulley for the timing belt (making the wrench click twice), and just because i didnt confirm it i went down 1 hr later and ripped the entire car apart again just to redo it and have the wrench click twice on that bolt LOL.
Mar 10, 2012, 09:08 PM
#44
Newbie
Join Date: Dec 2010
Location: sydney
Posts: 5
Likes: 0
Received 0 Likes
on
0 Posts
sorry to be slightly off topic here but is there a rating to arp2000 rod bolts? If correctly stretched and torqued where are its limits? In the process of odering from map and they seem to think that my rods will fail before the arp2000 rod bolts (i ordered manley I-beams)
Mar 10, 2012, 09:26 PM
#45
Evolving Member
iTrader: (2)
Join Date: Apr 2009
Location: australia
Posts: 209
Likes: 0
Received 0 Likes
on
0 Posts
It's probably not off topic as that's where the topic is going I'm sure.....it's a good question...I'd say a lot of power and torque I had scat rods with arp2000s and held up fine, as a matter of fact everything around the crank,rods and pistons couldn't take the boost and power it had......did a headgasket then noticed that the cyl wall was cracked......I really doubt they're hit and miss, I'd. Have to say they have to be installed and stretched properly, end of story. I'd have to ask another question as to whether the motor has had a beating in another way? Ie. a short period of detonation? Maybe it fatigued the rods/rod bolts and then combined with more torque down the track just gave up?....just suggesting