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7.3 Aftermarket
Some pieces of the puzzle
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[QUOTE="TARM, post: 104191, member: 578"] Big Bore, You mention the rods are being reheat treated and cryo'd; I think this is a good idea and will help. No way to know just how much stronger they will be as you have no way to know the strength of the product you are starting with. Do you know what hardness they are going to heat treat to? I am personally interested as I have wondered where the pros have factored the balance point between the added rigidity vs brittleness. (much like we see with the PMRs) With enough stress you would likely want a even number to either break or bend at that point. If you end up talking to them again could you see if you can find out the hardness they shoot for? Will you be doing shot peen, polishing before balancing? You plan to pay or polish them yourself? After balancing have you considered case or surface hardening treatments like nitrocarboizing. Its quite inexpensive as long as you are not stuck paying for a full batch price. For our rifle barrels it worked out to $3 IIRC per barrel but part of that was because we were paying for a full batch weight but were only doing lots of 200 barrels at a time. I would think you would want them balanced before hand as any grinding is a real PITA because the surface is that hard. We ended up having to use solid carbide bits on a set that had not had the gas ports drilled prior to treatment. 1500 HV/ 65 RW surface hardness @ .05mm/0.0020 thickness into metal surface. Then again you may not want to put this much time into a rod that dimensionally can only be so strong with the alloy used. You going to upgrade to ARP pins studs etc? What about 1/2 block fill? What about a bed plate? IMO anything that can increase rigidity and decrease any flex or distortion the better. Have you been researching into all the other little tips and tricks I have seen mentioned over the years on the forums and by guys that have been in one form or another of competition? I have seen so many things I would have surely not thought of to do on my own until I eventually had an issue and was on the next build LOL. Its a great thing when you can learn from others mistakes or process of learning when they are willing to share. It helps the entire community when these guys offer up any info no matter how small. Will you be doing the final engine assembly yourself? Not sure where you are at with any of this but maybe this thread is a good place to see what suggestions others have? With compounds you have end up with boat loads of low end torque so fast and with getting tuning dialed in makes sense to do as much as you can. [/QUOTE]
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Some pieces of the puzzle
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