*The famous con rod pic

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Cummins Forum Staff

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Last edited by MR4WLR : 03-23-2007 at 04:41 PM.

Before you guys get all AR-AR-AR-AR on us let me remind you that the Cummins rod carries 1/6th of the load and both the V-8 rods carry 1/8th of the load but there is still a huge difference in these rods, I have been told that the 2 V-8 rods combined weigh slightly more than the Cummins rod but thats just heresay and I cant vouch for its accuracy.

Cheers, Kevin

[dieselgearhead]

I would say that is true if you can compare a gas engine to a diesel engine. The SB Chevy rods p/ pair weigh slightly more than the I6 rods do.

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05' Crew Cab dually 4X4 cummins w/ 6 spd.
4.11's w/limited slip
EDGE JUICE W/ ATTITUDE, AFE TORQUE TUBE, TURBO SILENCER RING REMOVED, FIA WINTERFRONT/BUGSCREEN COMBO, BULLET STEP BARS, DEEZEE 5TH WHEEL ALUM. TOOL BOX, VENTVISOR WINDOW VENTS, AERO-TURBINE 4040L MUFFLER
05' Jayco Eagle 305BHS 5er
Son's truck 84 Chevy S10 w/ 355 V8 & TH350 trans

[jwiger]

also keep in mind that the cummins has a much longer stroke. meaning higher con.rod angles and more rotational G force.(also why your RPM is so low)

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James Wiger
Home page
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'05 PSD, Silver, SCLW, Torqshift, 4x4 -- Mods: Fast Idle switch
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and a couple to add to it

DM

Excellent photo DM, I hadent seen that one yet, I was wonnerin why the 2 powerstroke con rds are different in that pic..........anybody know? The lower bearing cap is in line with the rod in one pic and clocked off in the other pic, the one rod seams heavier too

[wish_i_got_a_ford]

i believe the lower is 6.0 and the upper is 7.3. not sure though.

[jwiger]

i think your right, also the top duramax rod looks like a GM 6.2/6.5 rod not a D-max

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James Wiger
Home page
Powerstroke.org
'05 PSD, Silver, SCLW, Torqshift, 4x4 -- Mods: Fast Idle switch
'05 Freestyle, Silver, CVT
'84 SVO Turbo/intercooled/EFI 2.3L, T5 -- Mods: hehehe - Sold
'65 New Yorker, white, 4dr.ht., 413cid, 727TF, 400,000 original miles

It sure is easy to see the difference of long stroke vs. high RPM , Last summer I watched a twin turbo D-max on the rollers and I will say that thing revved fast, he was at top rpm in a blink of the eye........impressive but I wouldnt trade the torque and longivity of the Cummins fer that

[jwiger]

well HP is a sum of Torque x RPM / 5252

Torque tells you how much thrust you have to get a load moving. But HP is how fast you can keep it moving.

Some companies are gambling thinking that a higher RPM diesel that has a broader (usable) RPM range is what'll sell.

Have you ever noticed all of the 1,000 ft/lbs Cummins are making 500 hp, that's because they can't be rev'd past 3K the Powerstrokes and Duramaxes can spin up to around 4K and although they don't make quite the same raw torque at the fly wheel as the cummins they make up for it with lower gears and more RPM's

__________________
James Wiger
Home page
Powerstroke.org
'05 PSD, Silver, SCLW, Torqshift, 4x4 -- Mods: Fast Idle switch
'05 Freestyle, Silver, CVT
'84 SVO Turbo/intercooled/EFI 2.3L, T5 -- Mods: hehehe - Sold
'65 New Yorker, white, 4dr.ht., 413cid, 727TF, 400,000 original miles

[Cummins4Life]

All in good fun.

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Zach Adams
94 2500 4x4 RegCab 3:54 190K Dunrite/RobGates Performance Auto DDpan 180pump 370's, 022DV's, 0Plate, 3KGSK, 60mm/14W AFE, Rips "Noise Pollution Special" straight pipe.

Goodun man and all rolled out on a piece of tolit paper too