What is the deal with Gen 3 rods
Thread Starter
Staging Lane
Joined: Sep 2003
Posts: 93
Likes: 0
What is the deal with Gen 3 rods The factory rods are spec'd 6.098" and most LS1 aftermarket rods are listed 6.1, 6.125 and 6.2"
Are the 6.1s considered to be stock length?, what about the 2 thousanths? Do they just round it up? Why do I not see a piston for a 6.1 rod with the .927" pin?
Also I have read that the big end of SBC rods are not symetrical whereas LS1 rods are. Do SBC rods drop in a LS1 or do you need to have them machined?
Are the 6.1s considered to be stock length?, what about the 2 thousanths? Do they just round it up? Why do I not see a piston for a 6.1 rod with the .927" pin?
Also I have read that the big end of SBC rods are not symetrical whereas LS1 rods are. Do SBC rods drop in a LS1 or do you need to have them machined?
Re: What is the deal with Gen 3 rods The rod length really dosent matter. even though its 6.098, it just rounds off to 6.100. Same with the bores of the pistons. Stock bore is like 3.898(or something like that), but everyone just calls it 3.90
TECH Veteran
Joined: Aug 2002
Posts: 4,055
Likes: 1
From: Hartsdale, NY
Re: What is the deal with Gen 3 rods I thought a longer rod gave you a better rod/stroke ratio...
...shouldn't the piston be matched to the length of the rod so it comes out of the hole/deck the right distance? (our motors have pistons whose tops extend beyond the block deck; most other motors do not.)
If your rod is too long, I thought the whole for the piston pin would petrude into the oil ring area and may result in a motor that tends to burn oil...
...shouldn't the piston be matched to the length of the rod so it comes out of the hole/deck the right distance? (our motors have pistons whose tops extend beyond the block deck; most other motors do not.)
If your rod is too long, I thought the whole for the piston pin would petrude into the oil ring area and may result in a motor that tends to burn oil...
Thread Starter
Staging Lane
Joined: Sep 2003
Posts: 93
Likes: 0
Re: What is the deal with Gen 3 rods The longer rod does not change the bore/stroke ratio--sorry, misread you did say rod/stroke, what it does is increase dwell time at TDC and BDC, as well as reducing the leverage of the crank on the side of the piston at mid stroke, thus reducing wear.
And yes when you increase rod length you have to decrease compression height on the piston.
So they round the length up to 6.1, now why can't I find a piston listed anywhere that has the aftermarket .927" diameter bushed pin, stock comp height and CCs?
And yes when you increase rod length you have to decrease compression height on the piston.
So they round the length up to 6.1, now why can't I find a piston listed anywhere that has the aftermarket .927" diameter bushed pin, stock comp height and CCs?
TECH Apprentice
Joined: Jan 2002
Posts: 320
Likes: 5
From: Nottingham, Notts, England, UK
Re: What is the deal with Gen 3 rods I got really fed up with lunati trying to sell me custom pistons for the ls1 but with the .927" pin when I wanted the LS1 pin bore size. They wouldn't budge! I bought my pistons from Ross
very nice to and now I would consider Diamond as wellequally nice!
So, maybe you could try lunati?
very nice to and now I would consider Diamond as wellequally nice! So, maybe you could try lunati?
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TECH Resident
Joined: Aug 2003
Posts: 948
Likes: 0
From: orlando, florida
Re: What is the deal with Gen 3 rods When i did my motor I just called lunati and told them I needed a set of forged 9.1:1 pistons for a stock bore stock rod ls1. they said no problem and gave me the price and part number and I had the pistons in about a week and they worked great. maybe I was just lucky.
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