Ls7 ti rod education
08-16-2018, 12:13 PM
#1
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Ls7 ti rod education
hi Guys. Hopefully you can help me with my dilemma.
Assembling a stock bottom end LS7 for a build here. as I’m going through the process, I am at measuring rods for out of round. Am using Arp bolts since there are no other aftermarket options and I am getting measurements that are varying .0007 to .0015 OOR. That being said, what am I up against in correcting this? I have spoken to Katech and gotten that the rods are coated? I of course would have to grind .002 off the parting surface and re hone. Are these in fact coated in the parting line surface and bore surface? And if so how do I fix this or where do I look to have this fixed? Certainly I’m not the only one that has had this issue but the search features bring up a lot of steel cracked cap applications.
Thanks in advance!
Assembling a stock bottom end LS7 for a build here. as I’m going through the process, I am at measuring rods for out of round. Am using Arp bolts since there are no other aftermarket options and I am getting measurements that are varying .0007 to .0015 OOR. That being said, what am I up against in correcting this? I have spoken to Katech and gotten that the rods are coated? I of course would have to grind .002 off the parting surface and re hone. Are these in fact coated in the parting line surface and bore surface? And if so how do I fix this or where do I look to have this fixed? Certainly I’m not the only one that has had this issue but the search features bring up a lot of steel cracked cap applications.
Thanks in advance!
08-16-2018, 12:36 PM
#2
1/4 mile/AutoX
you mean push rods ???
08-16-2018, 01:43 PM
#4
Team Owner
Katech makes rodbolts specifically for the TI rods. Should send them in to get rebushed on the small end, recoated/checked and setup properly.
08-16-2018, 01:59 PM
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Team Owner
08-16-2018, 02:01 PM
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08-16-2018, 02:02 PM
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08-16-2018, 02:16 PM
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08-19-2018, 02:41 AM
#10
Melting Slicks
ARP makes a replacement rod bolt set for the LS7. Some people send the rods to Calico for a recoating, which is required in my opinion. The rod coating flaking off is second only to the valve guide issue on the LS7. Once the old coating is compromised, it sends both rods to hell and metal debris into the oil. So if someone is rebuilding their LS7 it would be crazy not to have the rods recoated while they are out. Rebushing the small end isn't really critical IMO. Better to focus on pin fit and bearing clearance with the new bolts, resizing if necessary.
Or.....Just install some H-Beams and enjoy the giant cap screw that comes with them. Dwarfing the LS7 cap screw diameter.
ARP 234-6302 for the ARP LS7 rod bolts
Or.....Just install some H-Beams and enjoy the giant cap screw that comes with them. Dwarfing the LS7 cap screw diameter.
ARP 234-6302 for the ARP LS7 rod bolts
Last edited by Josh B.; 08-19-2018 at 02:44 AM.
08-19-2018, 01:19 PM
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ARP makes a replacement rod bolt set for the LS7. Some people send the rods to Calico for a recoating, which is required in my opinion. The rod coating flaking off is second only to the valve guide issue on the LS7. Once the old coating is compromised, it sends both rods to hell and metal debris into the oil. So if someone is rebuilding their LS7 it would be crazy not to have the rods recoated while they are out. Rebushing the small end isn't really critical IMO. Better to focus on pin fit and bearing clearance with the new bolts, resizing if necessary.
Or.....Just install some H-Beams and enjoy the giant cap screw that comes with them. Dwarfing the LS7 cap screw diameter.
ARP 234-6302 for the ARP LS7 rod bolts
Or.....Just install some H-Beams and enjoy the giant cap screw that comes with them. Dwarfing the LS7 cap screw diameter.
ARP 234-6302 for the ARP LS7 rod bolts
08-19-2018, 01:37 PM
#12
i have the rod bolts you stated that’s what started this debacle. Basically I’ve had the block honed to go .005 over, and the rotating assembly balanced with the current rods pistons etc. Heads are fixed. So now I’m stuck against trying to get these redone and new rods would Require a rebalance, and the cost of new rods. And probably new pistons which would set me way back again. Every place I’ve inquired to about resizing says they can resize but say nothing about the coating or anything on that matter.
08-19-2018, 03:17 PM
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I have sent him a pm however waiting on a response. Running Stock crank as well with h bearings. Just need to get the oor issie fuxed as cost effective as possible.
Last edited by rlawson; 08-19-2018 at 03:18 PM.
06-03-2019, 04:58 PM
#15
I just torqued ARP bolts into my stock rods over the weekend. Ran out of time to measure them.
From what I've read, you can likely get away with just a light touch on a hone to get them back round and they hopefully don't need the caps cut down.
I'm kind of flying by the seat of my pants on this one. We'll see how it goes. Calico does offer a coating for the rods, but it is not the stock coating. Re-coating them with CrN is not possible. The heat required to remove the original coating will compromise the titanium.
From what I've read, you can likely get away with just a light touch on a hone to get them back round and they hopefully don't need the caps cut down.
I'm kind of flying by the seat of my pants on this one. We'll see how it goes. Calico does offer a coating for the rods, but it is not the stock coating. Re-coating them with CrN is not possible. The heat required to remove the original coating will compromise the titanium.
