Topic: Rod Bolts

[MRieck]

Below are the instructions that came with a set of Super Rods.
Hope this helps.

Mick...those instructions should say 30 lbs of torque = .005 stretch. I installed a set about 4 months ago and measured .005 at 28 lbs on my torque wrench.

That is a good point Mike.
Although that was several years ago, I do recall taking them beyond 20 lbs.
I've got it my mind that it was 25/26 lbs but those numbers are relying on memory.

Just to be clear the instructions included with the last few sets of SuperRods I purchased said 30 lbs.

[01Thomas]

I'm doing this right now. I haven't tried to torque them up yet. I imagine/hope that once the nuts are torqued they will pull the bolts down into their holes for a very snug fit?

Has anyone had trouble using the F2 rod bolts on their K rods?

I have an early K2 engine I'm working on, and the F2 bolts I recently bought won't fit all they way through the bolt hole in the rod.  It almost fits but gets stuck with about 3-4mm left to go.  I've used them  before on my early F (1975) with no issues.

It's not the head of the bolt being too large.  I took some measurements and notice the F2 rod bolts tapper/shoulder slightly, with a larger diameter on the upper half of the bolt... and I also noticed that the bolt hole in the rod has step in it with a slightly smaller ID... the combination of these two things prevents the bolt from fitting.

Pictures attached.
The last picture, with the bolt in the wrong way is to show the point on the bolt where's it's too large to pass.

Has anyone experienced this, and if so, any suggestions?

Thanks,
Chris

[Kickstart]

I'm doing this right now. I haven't tried to torque them up yet. I imagine/hope that once the nuts are torqued they will pull the bolts down into their holes for a very snug fit?

Has anyone had trouble using the F2 rod bolts on their K rods?

I have an early K2 engine I'm working on, and the F2 bolts I recently bought won't fit all they way through the bolt hole in the rod.  It almost fits but gets stuck with about 3-4mm left to go.  I've used them  before on my early F (1975) with no issues.

It's not the head of the bolt being too large.  I took some measurements and notice the F2 rod bolts tapper/shoulder slightly, with a larger diameter on the upper half of the bolt... and I also noticed that the bolt hole in the rod has step in it with a slightly smaller ID... the combination of these two things prevents the bolt from fitting.

Pictures attached.
The last picture, with the bolt in the wrong way is to show the point on the bolt where's it's too large to pass.

Has anyone experienced this, and if so, any suggestions?

Thanks,
Chris

Oh... good point.     

Since I couldn't get it through with a strong push of my thumb, or gentle tapping, I figured I shouldn't force it.  But I just went into the garage and was able to easily pull it through by tightening the nut with a regular socket/ratchet, which was definitely much less torque than the final assembly torque.  I measured with my calipers and the F2 bolts are only about 0.01 to 0.02mm larger OD than the original K bolts where the smaller diameter is on the bolt hole... so I'm thinking it's just a tighter fit as you snuggest, and not going to cause any problems.

Thanks,
Chris

[Bill/BentON Racing]

Carrillo's no stretch gauge, list 50lbs torque!!!!  Bill

[PeWe]

Photo show the weak nuts and most likely bolts too, right?
Took the photo 3 years ago when I disassembled the motor. Crank got old replacement std rods 1985 and crank balanced again. My tuner should have known about the better F2 bolts+ nuts...
This setup has been screeming around on Autobahn in 8000-9500rpms, hour after hour.... a little lower CR. <10:x might have helped avoiding fatal failure
I guess my luck will soon end.. Last dyno close to 10krpms