Stock Rod Small blocks
#448480
08/24/09 09:10 PM
08/24/09 09:10 PM
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Joined: Jan 2003
Posts: 6,266 Renton Washington
Triple Threat
OP
master
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OP
master
Joined: Jan 2003
Posts: 6,266
Renton Washington
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Wondering who else is running stock rods in their motor still, how much power you're making and the number of passes you have on them. My 346 has propelled my 3500# Dart to 12.30@107.47. I've put roughly 400 passes on the rods and a number of street miles and foolish behavior. I shift the car at 5600 and go through the traps at 6000. Stock rods and bolts, cast piston, hyd. cam, etc etc , the limiter is set at 6200, so the motor isn't spun hard. How worried would you be? The engine currently has 256 passes on it since the last rering/bearing job, and all was well then, just curious if I'm on borrowed time or if I can still sleep well at night.
-Dustin 67 Dart, 9 second, 392" G3 Hemi 68 Barracuda 340 F/SA
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Re: Stock Rod Small blocks
[Re: emarine01]
#448485
08/24/09 09:38 PM
08/24/09 09:38 PM
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Joined: Jan 2003
Posts: 8,037 Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,037
Tulsa OK
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I ran low 12s and lots and lots of street miles on my stock rod 340. It had a 6000shift point and I beat on it regularly(all the time i was 18 lol). Stock crank broke behind the last rod journal and it wasn't really fatal. It still ran, and still had oil pressure but it sounded like someone beating a frying pan with a hammer at idle, got quite under load. I put eagle rods and another crank in it and was back in action.
68 Barracuda Formula S 340
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Re: Stock Rod Small blocks
[Re: Bad340fish]
#448486
08/24/09 09:48 PM
08/24/09 09:48 PM
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Joined: Jan 2003
Posts: 1,481 Outside
thedriver
pro stock
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pro stock
Joined: Jan 2003
Posts: 1,481
Outside
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stock rods here, spin 'er to 6500 or so every time i take it out, over 15000 abusive miles on it, if it breaks, i get to build a bigger motor, so not too concerned.
1973 challenger Dana. 4 speed. Low deck.
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Re: Stock Rod Small blocks
[Re: thedriver]
#448488
08/24/09 09:59 PM
08/24/09 09:59 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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I put a set of Viper rods in one of my 340's all balanced ... it ran about 2 seasons till a rod let go.... guess they didnt like 7500 rpm and that was with some fairly light pistons..... they all break, its just a matter of time and rpm
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Re: Stock Rod Small blocks
[Re: Lil Wedge]
#448489
08/24/09 10:01 PM
08/24/09 10:01 PM
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Joined: Jan 2003
Posts: 465 Oconomowoc, WI.
Cudahlr
mopar
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mopar
Joined: Jan 2003
Posts: 465
Oconomowoc, WI.
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I have run a best of 11.24 @121 for been together for 8 years now hundreds of passes plus thousands of street miles 360 stock rods, stock crank, cast pistons, e-heads, '68 barracuda 3200# dyno at 421 at the rear wheels
1968 Barracuda 360/727 11.20 @ 121 mph 421 rwhp 1985 Harley Sportster Bobber 2006 Ram 2500 sport - The Cudahlr
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Re: Stock Rod Small blocks
[Re: Cudahlr]
#448490
08/24/09 10:25 PM
08/24/09 10:25 PM
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Joined: May 2005
Posts: 84 NC
Badfish67
member
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member
Joined: May 2005
Posts: 84
NC
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I'm running a stock crank and rods in my 360 and spraying 150 shot...tons of passes on it and its still holding up...coming through the traps at 6900 rpm's. This winter i'm going to forged H-beam rods and forged crank so I can spray a 250 shot.
1967 Barracuda
360ci/727
9.723ET @139.44mph
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Re: Stock Rod Small blocks
[Re: Triple Threat]
#448491
08/24/09 10:26 PM
08/24/09 10:26 PM
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Joined: Jan 2005
Posts: 3,699 Newport, Mi
Evil Spirit
master
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master
Joined: Jan 2005
Posts: 3,699
Newport, Mi
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My AMC Spirit currently has a MP crate shortblock, ported Eddys, RPM Air Gap, 750 vac secondary, 3500 stall, low gearset 904, 3.89 gears, 325/50/15 BFG Drag Rads, 3100lb race wt. N/A has went 11.30 at 119 - 1.50 60', 6200 shifts,6100 trap rpm. On 100 shot went 10.51 at 126 - 1.42 60', 6200 shifts, 6450 trap rpm (window switch shuts NOS off at 6400). About 12K miles and 150 passes on motor. I try to keep rpms under 6500 on the stock rods. I'm considering a 3.50 gear and a 150 shot - should go through the traps at about 130 off the chip.
Free advice and worth every penny... Factory trained Slinky rewinder.........
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Re: Stock Rod Small blocks
[Re: Thumperdart]
#448493
08/25/09 07:37 AM
08/25/09 07:37 AM
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Joined: Jan 2003
Posts: 16,123 Grand Haven, MI
patrick
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,123
Grand Haven, MI
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if you're only turning it to 6K RPM, they'll last a looooong time, even with a fairly heavy piston, and at that, it'll probably be the bolts that fail, not the rod itself. what kills rods are the inertial forces from a heavy piston on the end of it suddenly changing direction. those forces increase IIRC by the square of the speed (say, 2000 to 4000 rpm is double the speed, but it'll be 4x the inertial forces). lighter pistons help, higher rod ratio helps due to lower piston accelerations for a given RPM.
Last edited by patrick; 08/25/09 07:41 AM.
1976 Spinnaker White Plymouth Duster, /6 A833OD 1986 Silver/Twilight Blue Chrysler 5th Ave HotRod **SOLD!*** 2011 Toxic Orange Dodge Charger R/T 2017 Grand Cherokee Overland 2014 Jeep Cherokee Latitude (holy crap, my daughter is driving)
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