replace or re-use rod bolts

I glad I'm not the only monkey ass that measures everything before after including break away torque. I learned this on high-po air cooled hd motors the hard way several dozen times

 

The conrod bolts are titanium, made by Pankl in Germany.

 

I'll email them (not listed on their site). I did email ARP - no reply yet.

 

all you guys lookin' to save a buck? Here ya go!!

Ferrari 328,348,355 (fits many) Connecting Rod-Bolt, # 100156 | eBay

Good luck with these, I'd suggest you get what you pay for.

D

 

The bolts are or just the rods? First I ever heard of titanium connecting rod bolts. If so I would definitely not reuse them

 

I am too chicken to reuse them especially woth the design, or trust anyone accept the original manufacturer. If i need to replace them i am getting screwed i guess.

On another note they are kinda pretty.

 

Steel bolts.

 

^ It was my understanding, and I certainly could be wrong (hell, I usually am), that F355/F50 bolts were indeed titanium ("MP35N low Titanium"), but the 360 bolts were steel (12.9). Unless of course we subscribe to the conspiracy theories of Ferrari pricing, that would somewhat explain why F355 bolts are significantly more expensive than 360 ones.

 

All I know is that the engines that have ventilated the blocks that came in here, had definitely broken a rod bolt, usually cyl #2. Factory parts, factory warranty (for what that's worth), I am not experimenting with your engine, pay the piper.

 

Any photos to share?

 

Almost, but not quite (nothing will EVER be quite like) a cambelt question/debate/thread

 

Sorry Daniel.......steel.


I think the price is explained by the fact that the original contract order of bolts is long gone and this was a much more recent purchase on their part. 355 bolts were not always nearly that high.

Also 360 and newer engines had a redesigned rod with pins indexing the rod cap so a simplified bolt was used. On 355, 550, 512M, F50 et al the bolt was the indexing device.

 

I've got an email into Pankl now - I'll report back when I hear from them.

 

Many suppliers to Ferrari have exclusive contracts and cannot sell to anyone else. Some of those parts are common to their other products and can be sold if they are not made aware they are to be installed in a Ferrari.

 

While you can turn down suitable material on the lathe, and mill or broach the head caps, you will not be able to roll the threads--which takes a great big <expensive> threading machine.

 

That's true except I have connections

And, you can get thread rolling attachments for CNC lathes

 

Understood. That said, Pankl does list Ferrari connection rods on their online store - not 355 - other models.

 

The design was changed post 355 so it may have been a different contractor.

 

Exactly. If something goes wrong we did it Ferrari's way, ask them.

Business started being about the best liability avoidance a long time ago.

 

Mitch - if you are throwing those away - please send me one

I'm still awaiting replies from ARP and Pankl..

 

Unless you know their history in its entirety I'd replace them. Just think of the loads on them when you lift off the throttle at 8500 RPM.

I forget the number of torque cycles this type of fastener is permitted but it's a very low number-- something in the range of 2-4 cycles. It's so low that I use other fasteners to dummy up the assembly and only install the trick fasteners on final assembly.

Those look very much like they were manufactured by SPS: Welcome to SPS Jenkintown

It might even say as much on the heads. You might check with SPS or if they won't help you check with one of the large rod manufacturers to see if they can find an SPS fastener that matches the originals. I know that Crower offers (or at least used to offer) SPS fasteners as upgrades, and perhaps even as standard on the higher-end rods.

 

I took Civil Engineering so for all the mechanical engineers if we made them in titanium and they weighed 22 grams how much more hp

 

I guess you would likely need all all rotating weight of engine internals?

 

Don't think you want to do that, unless you want to try for a 4500 rev limit