Home
Don't have an account? Create one now! It's always free!


Forgot Password
Ed's Auto Parts - Mention MOTORGEN for a Discount!
Motorgen Sponsor: McLeod Racing
Motorgen Sponsor: American Muscle - Add style and performance to your Stang
Motorgen Sponsor: Hall Fabrication & Racing
Motorgen Sponsor: Injectors Plus - Performance Fuel Delivery Systems
Reply
 
Thread Tools
Old 10-11-2012, 09:07 PM   #11
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Old 10-11-2012, 09:19 PM   #12
94cobra69ss39694cobra69ss396 is offline
Fast & Filthy
 
94cobra69ss396's Avatar
 
Join Date: Jun 2008
Posts: 3,840
Default

You convinced me to go with it. They actually use the same piston as the 331 just with the shorter rods. Speaking of the rods, they also told me that they didn't have the rods in stock but they would upgrade mine to the 4130 I beam Scat rod. I looked it up on their website and it's only around $20 more than the Probe 5140 rods the kit comes with but it has a 5.325 length so the piston should only be down in the hole .010 or so and it uses cap screws instead of through bolts.
  Reply With Quote
Old 10-11-2012, 10:28 PM   #13
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

I have the same rods, and they were kinda "meh" i'd prefer their rods but either way i'm sure you'll be ok. You should see if they wont upgrade you to h-beams, haha.

It's a great facility and everyone was really great, last time I was there picking up my kit the owner saw me trying on this shirt and told me to keep it.

__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Old 10-11-2012, 10:36 PM   #14
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

Oh BTW, saw this today
http://forums.corral.net/forums/susp...r-control.html
__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Old 10-12-2012, 06:46 AM   #15
94cobra69ss39694cobra69ss396 is offline
Fast & Filthy
 
94cobra69ss396's Avatar
 
Join Date: Jun 2008
Posts: 3,840
Default

I'd love to buy that but with this build there is just no way I could.
  Reply With Quote
Old 10-12-2012, 08:19 AM   #16
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

Just passing it along, I'd like to have it too but it wont work with my control arms. I'll probably hunt down some stock cobra ones.
__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Old 10-12-2012, 05:49 PM   #17
SkunkLookingCarSkunkLookingCar is offline
Member
 
SkunkLookingCar's Avatar
 
Join Date: Nov 2010
Posts: 92
Default

Little late replying but I might be a bit hesitant reusing the pistons with nicks in them. Worst case scenario, if they are made of a high silicon alloy like hypereutetic castings or a 4032 forging, then they are brittle and you probably already have cracks in the pistons which will propagate over time. Best case scenario would be if they are a 2618 forging; it is a much tougher material and the nicks would only act as a stress riser. Blending out the damage would help but now you don't have a compressive layer from the shot peening process. It is tough throwing out parts that are 99% perfect but it is really just a coin toss without doing some sort of non destructive testing like sonic and penetrant inspection. By the time you get that done, you are probably better off dollar wise getting new slugs. My 2 cents.
__________________
Easily entertained.
  Reply With Quote
Old 10-12-2012, 09:13 PM   #18
94cobra69ss39694cobra69ss396 is offline
Fast & Filthy
 
94cobra69ss396's Avatar
 
Join Date: Jun 2008
Posts: 3,840
Default

The old pistons are Probe SRS 2816-T61 and have been in my 471rwhp Cobra for 90,000 miles running 11-12 psi without any issues. I listed them on Craigslist with pictures of the worst looking piston. I don't think they will be an issue if someone buys them. If no one does though I'll take them to the scrap yard.
  Reply With Quote
Old 10-12-2012, 09:27 PM   #19
Shaolin CraneShaolin Crane is offline
pain's fun, hit me again
 
Shaolin Crane's Avatar
 
Join Date: Sep 2009
Posts: 6,264
Default

Well if you're gonna scrap them....


Those pistons aren't going to be a problem, this isn't on the deck its underneath, where there is the least amount of stress. If the valve reliefs or face or something was all nicked up then yeah i'd toss them. But not on the bottom side. Hell, we use forged 289 pistons all the time cause they're half the cost of the forged 302 pistons you just have to remove a tiny amount of material near the wrist pin. I've had 5 motors like this. One with well over 200k and no issues. Shawn has done countless like that.
__________________
Quote:
Originally Posted by Bruce Lee
Forget about winning and losing; forget about pride and pain. Let your opponent graze your skin and you smash into his flesh; let him smash into your flesh and you fracture his bones; let him fracture your bones and you take his life. Do not be concerned with escaping safely — lay your life before him

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
Stopping the world!
  Reply With Quote
Old 10-12-2012, 10:11 PM   #20
SkunkLookingCarSkunkLookingCar is offline
Member
 
SkunkLookingCar's Avatar
 
Join Date: Nov 2010
Posts: 92
Default

Disclaimer: Please don't think I am trying to start an argument. Tone is a difficult thing to portray through he interwebs. Metal is just something that I am extremely interested in and I don't want my enthusiasm to give the wrong impression.

The only problem with the nicks being on the underside of the piston is that that side experiences predominantly tensile stresses versus compressive stresses. Cracks will propagate under lower tensile stresses faster than higher comperssive stresses. There is a good chance that the pistons will be fine for quite some time, but I'm worried about the collateral damage and time to replace if one of the damaged pistons let go. Also, you mentioned that they have 90K on them. Aluminum doesn't have a fatigue life. All aluminum will eventually fail under any sort of cyclic loading; higher stresses and higher temperatures will expedite that. I would be delighted if I got 90K@12psi especially considering there was damage to them.
__________________
Easily entertained.
  Reply With Quote
Reply


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

vB code is On
Smilies are On
[IMG] code is On
HTML code is Off


All times are GMT -7. The time now is 07:52 AM.