Re: Aftermarket Rods A Engine
[Re: HMcCandless_Jr]
#2243580
01/29/17 08:35 PM
01/29/17 08:35 PM
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Joined: Jan 2005
Posts: 3,635 Oakland, MI
dizuster
master
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master
Joined: Jan 2005
Posts: 3,635
Oakland, MI
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No reason not to run stock rods if you have them. Throw a set of decent bolts in them, and have at it. I ran stockers in my 500hp 340 to 7200rpm for many many years without issue. I also ran stock rods for the first 3 years in my turbo car between 550hp-700hp. Max 6200 rpm on a 360. You don't need an eagle h beam for what you're doing. If you're hung up on putting an aftermarket rod in it, I'd look at the Scat Pro Comp I beams. They are about $365, pretty good bang for the buck. https://m.summitracing.com/parts/sca-26123
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Re: Aftermarket Rods A Engine
[Re: HMcCandless_Jr]
#2243745
01/30/17 01:19 AM
01/30/17 01:19 AM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
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master
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DFW
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I am looking at rods for the 273 Stocker build. The 273 rods are 727g each. Pretty heavy. I seem to remember the 340 rods being around 758g. The NHRA minimum weight is 655g, but is a reference number. The SCAT rods look like a good choice for a low HP engine like the 273 but aren't on the NHRA approved list. Anyone have a weight on those rods? Someone on Moparts had a set of Eagle I-beams for $125. Maybe that would be a good deal for someone? I couldn't use them since they aren't on the approved list, just the H-beams. The Manleys are the lightest on the approved list right at the minimum.
Floyd Lippencott IV
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Re: Aftermarket Rods A Engine
[Re: HMcCandless_Jr]
#2243785
01/30/17 02:34 AM
01/30/17 02:34 AM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
master
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master
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Posts: 3,505
DFW
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Yeah, the 273 rods are about 30g lighter than the 340/360 rods, but still 70g heavier than the minimum. What rods do you run in your stocker? I found a post of the SCAT I-beams on eBag of 595g. I seem to remember them being 605g, either way they would never be accepted as NHRA legal. Yeah, I think they weigh everything together. Not sure they use the old "one rod and one piston unmodified" from many years ago. Now it's "normal balancing", however they define that.
Floyd Lippencott IV
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Re: Aftermarket Rods A Engine
[Re: mr_340]
#2243797
01/30/17 02:49 AM
01/30/17 02:49 AM
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Joined: Aug 2003
Posts: 43,252 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,252
Bend,OR USA
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Have you been running a car in NHRA stock class? I did for around 15 yrs, I was toss out once for having a bead blasted intake back in 1975, I knew it was illegal and forgot to switch it before taking the car to the 1975 Winternationals, my fault If your planning on building a car that runs fast enough to always qualify more than one second under the index and set the NHRA class record I wouldn't worry to much about being told to pull a rod and piston out of the car, unless you really make someone who can make you do that mad at you at the races I've help more than one division 7 NHRA stock and SS racers set NHRA Worlds records and win NHRA World championships, one of them may have had to pull a rod and piston out of a SS/A car back east when they set the SS/A record 20 Yrs + ago, maybe not, I wasn't at that race
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Aftermarket Rods A Engine
[Re: HMcCandless_Jr]
#2243847
01/30/17 09:10 AM
01/30/17 09:10 AM
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crabman173
Unregistered
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crabman173
Unregistered
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Scat ProComp I beam is a fantastic piece for the $$ we run them in 600HP alky engines turning 0ver 7500 --they are Oliver copy --pretty trick units for the loot These are NOT the std I beam they also feature a short 7/16ths bolt
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Re: Aftermarket Rods A Engine
[Re: HMcCandless_Jr]
#2243914
01/30/17 01:13 PM
01/30/17 01:13 PM
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Joined: Sep 2007
Posts: 1,894 Spahn Ranch
RMCHRGR
top fuel
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top fuel
Joined: Sep 2007
Posts: 1,894
Spahn Ranch
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Scat rods here, 500hp 416. RPM to about 6,500. ARP bolts.
Mine are Brand X journals with 927 pins so they might be a tad lighter than the Mopar-specific rods they offer. I don't remember the part # off hand.
Nice rods and like said, around $300 something bucks.
'71 Duster '72 Challenger '17 Ram 1500
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Re: Aftermarket Rods A Engine
[Re: HMcCandless_Jr]
#2243983
01/30/17 03:13 PM
01/30/17 03:13 PM
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Joined: Aug 2011
Posts: 51 San Diego, USA
SoCalRacer
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member
Joined: Aug 2011
Posts: 51
San Diego, USA
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FWIW, ran the "645" 340 rods in an almost 500 HP 340 for years with only good bolts. 3200# stick car shifting at 7000 RPM. But it was a bracket car and those rods are heavier than the 273 rods, so for a stocker build you may want to use aftermarket as permitted.
Last edited by SoCalRacer; 01/30/17 03:14 PM.
If it ain't broke ... you're not pushing it hard enough.
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Re: Aftermarket Rods A Engine
[Re: HMcCandless_Jr]
#2244044
01/30/17 04:33 PM
01/30/17 04:33 PM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
master
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master
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DFW
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I'm figuring the 273-4bbl needs to make between 300 HP (run the L/SA index of 12.70) to 350 HP (maybe -.50 to -.70). Most of the rods are in the 700g range. The Manleys are closer to the minimum weight, but pricier. A lot of them are Chevy rods, but I need to keep the Mopar .948" piston pin.
ROD MANUFACTURER NOTES PART NUMBER NOTES EAGLE B.E. 2.250 S.E. 0.984 Length 6.123 Wgt 695 CR6123 SB Mopar K1 B.E. 2.250 S.E. 0.984 Length 6.123 Wgt 701 DH6123ANPB1 SB Mopar PBM PERF PRODUCTS B.E. 2.225 S.E. 0.927 Length 6.126 Wgt 712 CR6125 SB Chev Large Journal (SCAT) LUNATI B.E. 2.225 S.E. 0.927 Length 6.125 Wgt 665 LAE-1 LS-1 Rod TRICK FLOW SPECIALIES B.E. 2.225 S.E. 0.927 Length 6.125 Wgt 670 TFS-36612500 SB Chev Large Journal CROWER B.E. 2.250 S.E. 0.984 Length 6.120 Wgt 668 B93031 SB Mopar CAT B.E. 2.250 S.E. 0.984 Length 6.123 Wgt 725 CRS-6123 SB Mopar MANLEY B.E. 2.250 S.E. 0.875 Length 6.125 Wgt 655 14445 SB Mopar MANLEY B.E. 2.225 S.E. 0.927 Length 6.125 Wgt 668 14155C SB Chev Large Journal Carrillo B.E. Specify S.E. Specify Length 6.116 Wgt 655 CR-340Q4<SA-6125H SUPER STOCK ONLY Crower B.E. 2.000 S.E. 0.927 Length 6.115 Wgt 655 ML93902B5 SUPER STOCK ONLY
Floyd Lippencott IV
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Re: Aftermarket Rods A Engine
[Re: HMcCandless_Jr]
#2245113
02/01/17 02:03 AM
02/01/17 02:03 AM
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Joined: Jan 2003
Posts: 3,505 DFW
mr_340
master
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master
Joined: Jan 2003
Posts: 3,505
DFW
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What is the thinking here, put more mass in the rotating assy? I would think less rotating mass (big end of the rods, etc.) would mean more off the counterweight. You only get about 50% or so of reciprocating mass off the counterweight.
Floyd Lippencott IV
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