For the people out there scratching their heads about conrod options for your 6G74 here's some dirt:

Our conrods ARE forged items. A set of forged customs weighted in identically to our oem items! That's good!

Upto TJ the conrods are 22mm wide and weigh in about 745grams. They require the 'heavy' crank for balancing purposes.

From approx TJ onwards there was a 2nd style of conrod introduced - a light weight version apparently aimed at reducing reciprical mass to improve engine response and fuel economy. The downside is that the rod is CONSIDERABLY THINNER in crucial areas of the structure the least of which is the beam width is reduced to 17mm! and weight is down to 660grams.

ARP rod bolts: Direct fit to the 'skinny' rods, looks to require some minor modification of rod or bolt (depending on your philosophy) to get proper seating on the 22mm heavy rod.

** UPDATE **

The 'lighter' crank is supposedly sourced from the Pajero when they went from dohc to sohc. - Thanks Jason.

Hope this helps settle the conrod debate. :cool:

Skinnys have "74 F" on the rod neck - can only speculate as to what the "F" stands for, but the thicks have "74 N".

Visually the 74Ns are thicker in ALL critical areas notably at the neck of the big end around the bolt heads.

The 6G72 rods are almost identical to the 74N visually bar the smaller bigend 50mm vs 55mm and the overall length. Heavy enough to hand most applications if the metalurgy is up to scratch.

3L??

The 3L rods I saw were a shorter version of the 22mm heavies, except of course for the 50mm journal vs 55mm of the 3.5L. Look quite solid in all critical areas. Go with them!

im really glad to hear this as it means the forgies im getting made are based on the thicker ones

yay for my TH engine, just needs the better tune to match the power

so what does this mean for an early 00 tj?

For the people out there scratching their heads about conrod options for your 6G74 here's the dirt:

Upto TJ the conrods are 22mm wide and weigh in about 745grams. They require the 'heavy' crank.

From approx TJ onwards there was a 2nd style of conrod introduced - a light weight version apparently aimed at reducing reciprical mass to improve engine response and fuel economy. The downside is that the rod is CONSIDERABLY THINNER in crucial areas of the structure the least of which is the beam width is reduced to 17mm! and weight is down to 660grams.

ARP rod bolts: Direct fit to the 'skinny' rods, looks to require some minor modification of rod or bolt (depending on your philosophy) to get proper seating.

** UPDATE **

The 'lighter' crank is supposedly sourced from the Pajero when they went from sohc to dohc. - Thanks Jason.

Hope this helps settle the conrod debate. :cool:

Lol ya nearly wrote it out right Ian, ya went meant to say when they went from DOHC to SOHC in the 3.5L pajeros :)

Now the above mention of the pajero is only going a person i know who rebuilt a 1999 3.5 SOHC pajero for a customer which had a "light" crank but still had the "fat" rods all from factory. Damn mitsubishi and all there chopping and changing, its too bloody confusing!

im really glad to hear this as it means the forgies im getting made are based on the thicker ones


hope you have the crank for the wider ones or else ya might have to flog them off cheap

hope you have the crank for the wider ones or else ya might have to flog them off cheap

thats a problem for the future buyer to worry about, whoever that is

hmm, this concerns me. the guy who built my engine said NOTHING about the crank being light weight.

I had (well, I still have them, just not in my engine) the light rods. they weighed 545gms (w/o bolts) and I got them down to around 515gms. I measured the beam width and it's smack on 17mm.

but if I've put the Pauter rods on the light weight crank I might end up with bearing and journal damage. grr! I'm pretty sure they weighed about 630gms a piece (including bolts) so the weight difference shouldn't be that much.

hmm, this concerns me. the guy who built my engine said NOTHING about the crank being light weight.

I had (well, I still have them, just not in my engine) the light rods. they weighed 545gms (w/o bolts) and I got them down to around 515gms. I measured the beam width and it's smack on 17mm.

but if I've put the Pauter rods on the light weight crank I might end up with bearing and journal damage. grr! I'm pretty sure they weighed about 630gms a piece (including bolts) so the weight difference shouldn't be that much.

Ultimately if the person balances your complete rotating assembly properly then it should matter on the weight (with in reason of course). Hell lots of engine builders chop and change different brands/styles of cranks and rods etc and still get everything to come out spot on after balancing.

As i said before the builder of the pajero engine i spoke about had the "light" crank with the "thick/heavier" rods (which was all factory fitted parts) and that engine balanced up spot on during the rebuild. When ive done the balancing of my engines ive used the 50% balancing factor

More info added and updated.