Shot peening and connecting rod polishing

[herms99gst]

I was just wondering what everyone thought about this. Im considering polishing my 6 bolt rods and having a loacal engine builder shot peen them. Has anyone done this?

 

[bastarddsm]

Wouldn't bother. Stock rods seem plenty capable. Also, by the time you buy a set of ARP rod bolts, have them resized, polished, and shot peened, I'd bet your going to be over the $300 cost of new Eagle rods.

 

[RWD4G63]

I'm considering doing something like this as well. I have my doubts about Manley H-beams or Eagles being any stronger.

 

[spoolin ddub]

I was just wondering what everyone thought about this. Im considering polishing my 6 bolt rods and having a local engine builder shot peen them. Has anyone done this?

I highly doubt any "DSmer" has done this and if they have they won't admit it . How much power are you trying to make? Like ceramic coating it shouldn't cost to much to get parts done and the cost may go by a certain lbs limit. Problem isn't the initial cost. problem is what will have to be done after the process. Although they can benefit form the shot peening parts that deal with clearances are not ideal for the procedure cause they may have machined to get back to proper specs (crank, rods, pistons/piston rings etc).

Best example I can use is my hand deburred then shot peened TRE stage 4. The shit would not go into to gear for nothing when I first got it. that's why Jon instructs to over time get it into gear without shifting to fast or hard. A sooth transition working out the ruffness over time and eventually if broken in correctly like he instructs it feels like no other trans . That idea doesn't sound to good against a rod bearing etc .

 

[herms99gst]

I was going to polish them myself honestly, and have the rod bolts resized for arp's and than shot peened. But if the cost is substancial i wouldnt bother it. I just want a strong set of rods without havring to spend 300 dollars. The bolts are cheap and i have the rods already.

 

[92awddsm]

I did the same with my rods and never had an issue. But I worked in a machine shop so it didnt cost me anything to polish, shotpeen, and resize my own rods. All I had in it was cost of rod bolts and time. If you polish the rods, it should only cost about $150 to install and resize the rods and to shotpeen them. Then there is the cost of rod bolts on top of that.

 

[spoolin ddub]

I was going to polish them myself honestly, and have the rod bolts resized for arp's and than shot peened. But if the cost is substancial i wouldnt bother it. I just want a strong set of rods without havring to spend 300 dollars. The bolts are cheap and i have the rods already.

After the rod is shot peened it isn't over. They may have to be straightened and/or machined down back to size/specs. It will do wonders and is a great idea. They've been doing over in Japan for decades but It's more to the process than you think.

 

[92awddsm]

After the rod is shot peened it isn't over. They may have to be straightened and/or machined down back to size/specs. It will do wonders and is a great idea. They've been doing over in Japan for decades but It's more to the process than you think.

Its about $20/rod to resize/recondition the rods. Approx $20 for them to install rod bolts. And about $50 to shotpeen. The rod is straightened and machined in the recondition process.

 

[spoolin ddub]

Its about $20/rod to resize/recondition the rods. Approx $20 for them to install rod bolts. And about $50 to shotpeen. The rod is straightened and machined in the recondition process.

Where did you get that info on the pricing from and what company/shop does the shotpeening?

 

[92awddsm]

Where did you get that info on the pricing from and what company/shop does the shotpeening?

NAPA machine shop here in VA

 

[herms99gst]

At 150-170 I would probally do it. I know the rods are strong to begin with i just want the piece of mind and to do something different. I don't have anyset goals hp wise, I just really want to push the oem parts.

 

[spoolin ddub]

At 150-170 I would probally do it. I know the rods are strong to begin with i just want the piece of mind and to do something different. I don't have anyset goals hp wise, I just really want to push the oem parts.

are these new or used parts?

 

[olddsmer]

For not much more money, you can get a set of Manley Rods. They are rated to 650HP. I believe the stock rods are rated to around 450. I know the Manley rods are pretty well balanced right out of the box and come with ARP bolts.


Regards
Greg

 

[herms99gst]

Their used rods out of a 6 bolt block that had 92k on it. I just kept the rods when i built the block. The bolts would be new.

 

[spoolin ddub]

Their used rods out of a 6 bolt block that had 92k on it. I just kept the rods when i built the block. The bolts would be new.

Don't even waste your time . If its going to cost $150-$170 for the shotpeening and then $60+ on top of that for the arp 2000 rod bolts. Just get the eagle rods/arp 2000 from MAP for $294. Now if you can shotpeen them that'll be bad ass.

 

[herms99gst]

Looks like ill just run the rods with bolts then , and a polish.

 

[RWD4G63]

Don't even waste your time . If its going to cost $150-$170 for the shotpeening and then $60+ on top of that for the arp 2000 rod bolts. Just get the eagle rods/arp 2000 from MAP for $294. Now if you can shotpeen them that'll be bad ass.

Eagles and Manley h-beams are shot peened during the production process.

 

[spoolin ddub]

Eagles and Manley h-beams are shot peened during the production process.

Exactly. I was talking about if he had the loot to purchase them and then get them shot peened.

 

[RWD4G63]

Exactly. I was talking about if he had the loot to purchase them and then get them shot peened.

Am I reading this wrong? There is no benefit to shot peening a part twice.

 

[spoolin ddub]

Am I reading this wrong? There is no benefit to shot peening a part twice.

Ah shit. Read your post incorrectly on my phone screen

 

[Fotowntalon]

On stock rods, I personally would do it, but then again I have access to an industrial sized shotpeener. As for aftermarket rods, as has been stated, most are shotpeened during production. If I had a 4g63, and no access to the shotpeener, I would just get aftermarket rods, after the cost of shotpeening vs a new set, along with how much actual strength is gained, I personally don't see it being worth the hassle.

 

[biglady112]

Just to give some ACTUAL figures in this thread. I just had four stock rods reconditioned and one cracked piston swapped off for a good piston and it only cost me $58 out the door. I picked mine up yesterday. Far cheaper than anyone here has said. If you don't know the answers, don't respond. I doubt all the folks who were throwing out figures have ever even had any sort of machine work done.

Last year when we had another set of rods done, there was no machining needed for the ARP rod bolts. And they only cost us $30 through the machine shop to get them. So it is very cheap to get this done. I would not shotpeen at all. You can find a better way to spend money on better improvements. This will net you no gains you will ever notice. The rod will still be cast and crappy no matter how you slice it.

 

[RWD4G63]

If you don't know the answers, don't respond... The rod will still be cast and crappy no matter how you slice it.

Stock rods are forged. If you don't know the answers, don't respond.

 

[RadDsm]

Stock rods are forged. If you don't know the answers, don't respond.

Lolwut?

 

[92awddsm]

Just to give some ACTUAL figures in this thread. I just had four stock rods reconditioned and one cracked piston swapped off for a good piston and it only cost me $58 out the door. I picked mine up yesterday. Far cheaper than anyone here has said. If you don't know the answers, don't respond. I doubt all the folks who were throwing out figures have ever even had any sort of machine work done.

Last year when we had another set of rods done, there was no machining needed for the ARP rod bolts. And they only cost us $30 through the machine shop to get them. So it is very cheap to get this done. I would not shotpeen at all. You can find a better way to spend money on better improvements. This will net you no gains you will ever notice. The rod will still be cast and crappy no matter how you slice it.

I gave actual figures from the machine shop I worked in. And as stated, 4g63 rods are forged steel, not cast. And shot peening is to strengthen the rod which isnt something noticeable.

If a shop said there was no machine work that needs to be done to install rod bolts, i would pick a different shop.