Here's a photo of the rods and crank for anyone who may be interested. Image Unavailable, Please Login -Prescott @ GSJFerrari
Quite different actually. In normal use stock rods are not an issue. Sodium valves break no matter how the car is being used.
Does anyone have a photo of failed 308 rod? I found them sturdy except the soft bimetal pin bushes which had worn (too soft)
I am repairing a 330 block right now that broke a rod. Same part. Too soft pin bushing? 1st time in 43 years of professional Ferrari work I have ever heard that said. Sorry, gotta disagree. They simply are not a problem.
Where did the rod break Brian? My sample size on the SE bushes is small, two engines, but both had play in all the small ends. One engine 36k miles (lots of play), one unknown miles but fairly low as the bores were std with minimal wear (clearance was borderline.) I’ve sold hundreds of solid 954 aluminum bronze bushes to several engine builders and still have a few sets left in case others have worn bushes.
Down near the big end. Ferrari rod bushings have never been considered an issue. Back when we almost always had custom pistons made we just ordered them with slightly larger pis and resized stock bushings. I have been in Ferrari business for over 40 years and have friends all over the country with similar experience. First time I have ever heard of Ferrari rod bushing problem. Excuse me If I dont believe it.
There's only 3* mfg I can think of that I would ever put in a Ferrari build. CP Carrillo Italian RP Pauter *Ok a 4th but it's pricy for custom, Crower Ti rods. Been thru so many rod mfg during R&D it's nuts.
I suspect that £50 for new bushes is cheaper than custom pins (which would only be required if the original bushes are worn.)
Years ago when I rebuilt my QV engine the bushes were a bit out of spec as were a few of the big ends and needed attention....which made them functional if a sad compared to the carrillos
