arp rod bolt torque
02-20-2010, 05:54 PM
#2
I don't know about ARP. As a point of reference GM's current spec for OEM bolt is:
Tighten the connecting rod bolts a first pass to 20 N.m (15 lb ft).
Tighten the connecting rod bolts a final pass to 85 degrees using the J 45059 Angle Meter.
Katech's call for 50 ft lbs. but the last time I looked they TS was 260K and ARP was only 200K.
Tighten the connecting rod bolts a first pass to 20 N.m (15 lb ft).
Tighten the connecting rod bolts a final pass to 85 degrees using the J 45059 Angle Meter.
Katech's call for 50 ft lbs. but the last time I looked they TS was 260K and ARP was only 200K.
02-20-2010, 07:05 PM
#3
40 is what I used no problems. I find it funny that people state that katech don't need rod resizing yet they require a higher torque spec than arp. You always see the posts that state ARP bolts will require rod resizing but yet the katechs need 10 more ft/lbs of torque, so wouldn't that stretch them out even more ? 
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05-04-2010, 10:13 AM
#20
19. What and how exactly is ARP2000 does it compare to 8740 and 4340?
ARP2000 is a heavily alloyed martensitic quench and temper steel, initially developed for use in steam power plants. As such it has excellent stability at high temperatures. But most important, ARP research discovered that in addition to temperature stability it has excellent notch toughness in the higher strength ranges and is alloyed to be tempered to Rc44/47. 8740 and 4340 can be tempered to the same hardness. But, the tempering temperature would yield material in the “temper brittle zone” (between 500° and 700°F), producing significant notch sensitivity. ARP2000 is tempered above that temperature range and has a strength between 200,000 and 220,000 psi.
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.
L19 is the stuff 2000hp Outlaw cars use for headstuds.