Has anyone used ls7 rods in a ls1 or ls6?
03-15-2012, 10:54 PM
#1
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Has anyone used ls7 rods in a ls1 or ls6? My engine builder just finished my motor. It is a ls6 block with ls7 rods, lightened stock crank and custom manley pistons. Anyone else use the titanium ls7 rods. just curious. I hope this motor revs quick.
03-17-2012, 06:46 PM
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Yea, I was happy with an 11 second car that has ac, no weight reduction and i drive to and from the track, but my car was huffing on d cell. so i knew the rings had to be replaced on my 110,000 mile car. I had a budget for a 383 but my engine builder planted the ls7 rods and a lightened crank idea in my head. With his ported ls6 heads and this bottom end. There is no reason why it shouldnt be close to the 10's. I will give a track and mustang dyno update some time after it is installed this week.
03-17-2012, 08:52 PM
#6
Not really difficult. Hone the pin bore bushings from 0.927 to 0.940, use a 4.125" stroke crank, a piston with 1.11 compression height, and maybe a small cut on the deck to adjust how far out the pistons come. Just looking to see if anyone else has done it and wondering why the pro's don't like it. A full set of Ti rods with pistons still attached just went for $400 on E-Bay...
03-17-2012, 09:39 PM
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Not really difficult. Hone the pin bore bushings from 0.927 to 0.940, use a 4.125" stroke crank, a piston with 1.11 compression height, and maybe a small cut on the deck to adjust how far out the pistons come. Just looking to see if anyone else has done it and wondering why the pro's don't like it. A full set of Ti rods with pistons still attached just went for $400 on E-Bay...
I can tell u the compression is around 12-1 on my motor. And Mike (my builder) used to build motors for cartek and is now on his own. So he knows ls motors and he did not see a down side to using the ls7 rods.
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03-18-2012, 07:30 PM
#8
I'll keep Jason's opinion out of it, as it was through a PM. I personally don't see a down side either, other than the initial cost and extra machining. Thinking more on it, there may be some possible crank cheek interference at BDC but that could easily be rectified. I have only looked at off-the-shelf pistons from Wiseco's catalog, there may be other stroke options depending on available compression height dimensions...
03-18-2012, 07:53 PM
#9
Theres a full set on here right now for 650. I'm definately interested in this idea however.
How do the titanium rods compare to forged? My application would be strictly N/A, so my concern is longevity, living in a street car that will see 6800 tops.
How do the titanium rods compare to forged? My application would be strictly N/A, so my concern is longevity, living in a street car that will see 6800 tops.
03-20-2012, 11:17 AM
#14
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Not really difficult. Hone the pin bore bushings from 0.927 to 0.940, use a 4.125" stroke crank, a piston with 1.11 compression height, and maybe a small cut on the deck to adjust how far out the pistons come. Just looking to see if anyone else has done it and wondering why the pro's don't like it. A full set of Ti rods with pistons still attached just went for $400 on E-Bay...
03-20-2012, 11:19 AM
#15
FormerVendor
I'll keep Jason's opinion out of it, as it was through a PM. I personally don't see a down side either, other than the initial cost and extra machining. Thinking more on it, there may be some possible crank cheek interference at BDC but that could easily be rectified. I have only looked at off-the-shelf pistons from Wiseco's catalog, there may be other stroke options depending on available compression height dimensions...
03-20-2012, 11:23 AM
#16
FormerVendor
With the lightened stock crank as long as rod journals are still 2.100 you should be fine with those rods as far as the rod cheek to fillet area.
03-20-2012, 07:26 PM
#17
So Erik, what are your thoughts on using Ti rods in a normally aspirated engine? I'm liking the idea of a very light rotating assembly and I'm guessing the crank could be balanced by removing some of the cheek, perhaps by knife-edging them?
Thanks for the correct dim's, I don't know where I saw those pin dia's I posted...
Was not aware of this, even if running chamfered bearings, the Ti rod still needs to be beveled for the larger fillet?
Was not aware of this, even if running chamfered bearings, the Ti rod still needs to be beveled for the larger fillet?
03-20-2012, 08:07 PM
#18
FormerVendor
So Erik, what are your thoughts on using Ti rods in a normally aspirated engine? I'm liking the idea of a very light rotating assembly and I'm guessing the crank could be balanced by removing some of the cheek, perhaps by knife-edging them?
Thanks for the correct dim's, I don't know where I saw those pin dia's I posted...
Was not aware of this, even if running chamfered bearings, the Ti rod still needs to be beveled for the larger fillet?
Thanks for the correct dim's, I don't know where I saw those pin dia's I posted...
Was not aware of this, even if running chamfered bearings, the Ti rod still needs to be beveled for the larger fillet?
They should work great as the lightness is good. Yes you still need to trim them on the side even with chamfered bearings.
03-23-2012, 08:13 PM
#20
FormerVendor