Performance Boats Forum banner

1 - 17 of 17 Posts

·
Registered
Joined
·
2,034 Posts
Discussion Starter #1
I was told NOT to handle L19 rod bolts without gloves. So I called ARP tech support and they said the same thing and sent me these from their catalog,

PAGE 19
20. How does L19 compare to ARP2000?
L19 differs from ARP2000 in that it is a vacuum melted
alloyed steel with sufficient chromium and carbon to achieve
high hardness (but below the level of a stainless steel). L19 is
air-cooled from the hardening temperature in a way that does
not require an oil quench to achieve full hardness and is tempered to assure full conversion to martensite between 1025°F
and 1075˚F. L19 is a proprietary material capable of achieving
strengths of 220,000/230,000 or 260,000/270,000 psi as may
be required. Both L19 and ARP2000 steels are modified bcc
(martensite) at room temperature. L19 has the same advantage as ARP2000 in that a high strength is obtained at a high
tempering temperature. This alloy is easily contaminated and
requires special handling.

PAGE 20
L19: This is a premium steel that is processed to deliver superior strength
and fatigue properties. L19 is a very high strength material compared to
8740 and ARP2000 and is capable of delivering a clamp load at 260,000
psi. It is primarily used in short track and drag racing applications where
inertia loads exceed the clamping capability of ARP2000. Like most high
strength, quench and temper steels – L19 requires special care during
manufacturing to avoid hydrogen embrittlement. This material is easily
contaminated and subject to stress corrosion. It must be kept well-oiled
and not exposed to moisture.

Could the handling seen in the pics be cause for concern or is the advice from ARP overkill ?

The pics are not my hands BTW......
 

Attachments

·
Premium Member
Joined
·
25,975 Posts
The L19 bolt is highly susceptible to stress corrosion. You could handle one for days, and set it on a table and it would probably be fine. Install it in an engine, load it with torque, and it will start to corrode.
If you should handle one, you can simply wipe it real good with iso propyl alcohol or acetone, and oil it real well.

Not that it is a bad bolt, but I am not a fan of the bolt in none race situations. If you neglect the oil and allow acid or moisture to collect in the oil it can attack the bolt.
The ARP 2000 is virtually totally ammune to corrosion and is almost as strong as the L19 and has better fatique life. Its why the 2000 bolt is the most common bolt up grade in after market rods. The 2000 bolt is stronger than most rods it is installed in. You will more than likely fail the rod before you fail a ARP 2000 bolt



100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
 

·
steelcomp was here
Joined
·
26,515 Posts
The L19 bolt is highly susceptible to stress corrosion. You could handle one for days, and set it on a table and it would probably be fine. Install it in an engine, load it with torque, and it will start to corrode.
If you should handle one, you can simply wipe it real good with iso propyl alcohol or acetone, and oil it real well.

Not that it is a bad bolt, but I am not a fan of the bolt in none race situations. If you neglect the oil and allow acid or moisture to collect in the oil it can attack the bolt.
The ARP 2000 is virtually totally ammune to corrosion and is almost as strong as the L19 and has better fatique life. Its why the 2000 bolt is the most common bolt up grade in after market rods. The 2000 bolt is stronger than most rods it is installed in. You will more than likely fail the rod before you fail a ARP 2000 bolt
X2...stress corrosion from hydrogen embrittlement, even from the moisture in your hands. The L19 is seldom worth the hassle.
 

·
steelcomp was here
Joined
·
26,515 Posts
[/U][/B]Could the handling seen in the pics be cause for concern or is the advice from ARP overkill ?

The pics are not my hands BTW......[/FONT]
Good Lord! Those hands could ruin an anvil!

:D
 

·
Premium Member
Joined
·
25,975 Posts
A couple of things should be mentioned here.
First, don't even remotely consider ever cleaning a L19 bolt with carb or brake cleaner. The chlorine in the stuff is certain death to the bolt.
Second, don't let a can of Prolong or Duralube within 1000 ft of your engine, for exactly the same reason.

Like Steel said, the bolt is very susceptible to hydrogen embrittlement. But that is a much bigger factor in the manufacturing the bolt than in the use. It can occure in use, but plain old every day stress in the wrong environment and the bolt is toast and is much easier to occur with the L19 in use.

It takes 3 things to cause stress corrosion.
1. The right metal.
2. the right corrosive
3. sufficient tensile stress

This is one of the best sites I have read on the subject wthout getting all "scientific" in the language.

http://www.npl.co.uk/upload/pdf/stress.pdf



100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
 

·
Registered
Joined
·
239 Posts
I agree! ARP 2000's are great and not as fussy as the L19's. L19's do have a higher clamp force but unless you really need it for your application stick with the 2000's.
 

·
Premium Member
Joined
·
25,975 Posts
I agree! ARP 2000's are great and not as fussy as the L19's. L19's do have a higher clamp force but unless you really need it for your application stick with the 2000's.
The L19 does have more potential clamping force than the 2000. But in many of the import rods, you can't torque the L19 to it full clamping capability because the big end of the rod can't take it. Most import rods have a torque value almost the same for the L19n and 2000.

I resently bought a set of Callies Ultra rods, and the L19 bolt is them is torqued to 95lbs. In a Scat or Eagle rod the L19 is more like 75lbs. In that situation, I much perfer the 2000 bolt, due to it's better fatique.



100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
 

·
Registered
Joined
·
239 Posts
The L19 does have more potential clamping force than the 2000. But in many of the import rods, you can't torque the L19 to it full clamping capability because the big end of the rod can't take it. Most import rods have a torque value almost the same for the L19n and 2000.

I resently bought a set of Callies Ultra rods, and the L19 bolt is them is torqued to 95lbs. In a Scat or Eagle rod the L19 is more like 75lbs. In that situation, I much perfer the 2000 bolt, due to it's better fatique.
What was the stretch spec on the Callies Rods for the L19's? I think Eagle says 75 ft-lbs or .0075" stretch or something close to that. On the ones I have built the .0075" came with 70 - 75 ft-lbs. I assume at 95 ft-lbs the bolt would stretch a bit more.
 

·
Premium Member
Joined
·
25,975 Posts
What was the stretch spec on the Callies Rods for the L19's? I think Eagle says 75 ft-lbs or .0075" stretch or something close to that. On the ones I have built the .0075" came with 70 - 75 ft-lbs. I assume at 95 ft-lbs the bolt would stretch a bit more.
There are 2 L19 bolts, with 2 different tensile strengths. Don't ask me why. Also, the stretch is a factor of the cross section of the bolt. Most 7/16 L19s supplied with Scat or Eagle rods is under cut. The ones supplied with the Callies rods were not. The stretch is 6.5 to 7. Which is a PERFECT reason to KNOW the bolt that you are using and that it is the CORRECT bolt for the rod. Not all L19 bolts are the same, even if they have the same tensile rating. If the bolt is undercut, it will have a different TORQUE value than a non undercut bolt. Again, another GOOD reason for measuring stretch. If you were to torque the bolts in my Callies rods to 75 lbs, they would probably fail pretty quick due to being under stretched which is usually worse than or stretched.



100% free webcam site! | Awesome chicks and it is absolutely free! | Watch free live sex cam - easy as 1-2-3
 

·
Registered
Joined
·
239 Posts
There are 2 L19 bolts, with 2 different tensile strengths. Don't ask me why. Also, the stretch is a factor of the cross section of the bolt. Most 7/16 L19s supplied with Scat or Eagle rods is under cut. The ones supplied with the Callies rods were not. The stretch is 6.5 to 7. Which is a PERFECT reason to KNOW the bolt that you are using and that it is the CORRECT bolt for the rod. Not all L19 bolts are the same, even if they have the same tensile rating. If the bolt is undercut, it will have a different TORQUE value than a non undercut bolt. Again, another GOOD reason for measuring stretch. If you were to torque the bolts in my Callies rods to 75 lbs, they would probably fail pretty quick due to being under stretched which is usually worse than or stretched.
Makes sense and the reason I asked about the stretch.

Thanks,

Craig
 
1 - 17 of 17 Posts
Top