Bent another connecting rod

[slagburn]

My 13's engine is out and apart for a forged bottom end. 10,500 miles on it, 8500 with a Whipple 2.9. It has been a great motor for that brief time. It used zero oil unlike my 12 which drank oil for the first 6K. I ran it pretty hard, last time out it trapped 135 at full weight, 7000DA- about 690 uncorrected. It didn't smoke, rattle or vibrate at all.

I was surprised to find one conrod tilted just a hair at the small end. Ironically it was the one that had the best condition piston. Pistons all looked great and this one did not have piston oil squirters.

I wonder how much longer it would have ran? Ford needs to put a little better rod in these motors. At least it was taken apart before nuking the block and a head or two.

 

[me32]

pics?

 

[grnenvy]

WOW good luck with the build.

 

[D.T.R]

You're lucky haha

 

[blackbeast12]

Should i start building a short block soon. I don't run my car nearly as hard as slagburn, in fact never ran it at the track...... Maybe i should jump on mmr shortblock special now...

 

[by9468840]

690 rwhp!! and are you still wondering why you bent a rod?!!

 

[Dave5.0]

Livernois, end story.

 

[mhyjek]

What kind of tq where you putting down to the wheels? What kind of tq curve I bet you had over 500 at like 2000 rpm?? I believe that is more of the reason than the hp #...

 

[slagburn]

690 rwhp!! and are you still wondering why you bent a rod?!!

Pretty sure I never said I was wondering why. That's obvious. What surprised me was finding this one in the very early stages of failure with no warning signs.

 

[slagburn]

What kind of tq where you putting down to the wheels? What kind of tq curve I bet you had over 500 at like 2000 rpm?? I believe that is more of the reason than the hp #...

That is a distinct possibility, both motors that did this had Whipples on them. Insta-torque= more parts stress.

 

[grnenvy]

My new motor should be at my house in 5 weeks. I'm going to sell it while its still good. It should pull a decent $$.

 

[me32]

Should i start building a short block soon. I don't run my car nearly as hard as slagburn, in fact never ran it at the track...... Maybe i should jump on mmr shortblock special now...

it would be a good idea to just have money ready

 

[SILV03MustangGT]

it would be a good idea to just have money ready

Yup! My car is now paid off and I can def afford to throw a built motor in her. That's a nice feeling. That and if my motor grenades then oh well lol

 

[Modular Racing]

Unfortunately the rods in the 2011-2014 are marginally better than the 96-04 Mustang Gt rods, they feature a nicer cap screw with increased material at the big end but the average person would not be able to tell the difference between the two rods if they were side by side.

Most of the engines that are sent to us for Forged rebuilds have bent or broken rods, in some cases the customer was not even aware of it until we took a picture and sent it to them. The bottom line is if you want to be safe a forged set of rods are suggested for anything above 600HP and while we recognize there are cars out there that are making this or more power the fatigue life of a powdered metal rod is short when pushed beyond its intended limit (the factory HP).

For those interested we have the 1000HP shortblocks on sale for $3699 or you can send in your existing shortblock for a 1000 upgrade for $2399.

Best of luck to the OP with the rebuild and if I remember correctly he has already purchased most of the rebuild parts from us so we appreciate the business!

Modular Motorsports Racing

 

[slagburn]

Yes MMR was the parts source- 11.5:1 pistons showed up today so it's time to get busy, thanks MMR for the goodies!

 

[sean04]

Unfortunately the rods in the 2011-2014 are marginally better than the 96-04 Mustang Gt rods, they feature a nicer cap screw with increased material at the big end but the average person would not be able to tell the difference between the two rods if they were side by side.

Most of the engines that are sent to us for Forged rebuilds have bent or broken rods, in some cases the customer was not even aware of it until we took a picture and sent it to them. The bottom line is if you want to be safe a forged set of rods are suggested for anything above 600HP and while we recognize there are cars out there that are making this or more power the fatigue life of a powdered metal rod is short when pushed beyond its intended limit (the factory HP).

For those interested we have the 1000HP shortblocks on sale for $3699 or you can send in your existing shortblock for a 1000 upgrade for $2399.

Best of luck to the OP with the rebuild and if I remember correctly he has already purchased most of the rebuild parts from us so we appreciate the business!

Modular Motorsports Racing

How much better are the boss rods, if any?

 

[BMR Tech]

690 rwhp!! and are you still wondering why you bent a rod?!!

Also keep in mind, 690 UNCORRECTED at 7,000 ft.....

That's a solid 750rwhp or more, at sea level....and closer to 800 SAE, I would think?

:rockon:

 

[Modular Racing]

Yes MMR was the parts source- 11.5:1 pistons showed up today so it's time to get busy, thanks MMR for the goodies!

Our pleasure and thank you for the business! Please let us know if you have any questions or need help with your project! :beer:

 

[Modular Racing]

How much better are the boss rods, if any?

The std boss 302 uses the same rod.

 

[ArtVandalay16]

That was quick turnaround MMR for slag. Nice. Subscribed