Rods!

Left rod is original.

 

How is the Carrillo better?

 

I would say better as in stronger as it has more material across the entire body of the rod.

 

The H beam rod is stronger in torsion and lighter - just a few decades of engineering knowledge and modern production techniques.

 

It's very common that a set of H beam forged rods weight 300 grams or so lighter PER cylinder. Combine that with a lighter forged piston and you're subtracting a pound or so of rotating mass from the crankshaft, which then can itself have more weight removed as it does not need as much weight to balance a heavy rod and piston. This stuff adds up and makes a measurable difference in power output.

A 360 crankshaft and 308 crankshaft are pretty much the same size, but the 360 crank weighs a solid 10lbs less (31lbs vs 41lbs for 308).

 

Tommy, the weak link in any Ferrari engine is the connecting rods. In a stock engine they are pretty good but any Ferrari engine run real hard if it breaks is usually the rods. Very few who rebuild Ferrari engines professionally either for performance or just lawns at Pebble Beach use Ferrari rods. It is such a common modification Carillo has 2 catalog part numbers for rods for Ferrari. I just ordered a set of 12 yesterday.

 

rods I think are
Stock= 570g, depending on set
Carrillo= 395g
Ferrari Ti = 338g (at least mine are)

Carrillo says only 103g is rotating which is about 1/3...I think that is about the for all, 2/3 reciprocating, 1/3 rotating

My forged pistons are 300g....I think stock cast pistons themselves are lighter but way more fragile and the savings is in the wrist pistons but I can't find a numbers easily.

While googling I saw aliexpress has h beam 308 rods for $1200, those are probably wonderful

 

I did drawings and got quotes under £100 each but decided to stick with original and just use ARP bolts and better pin bushes. If there’s interest I could get a few sets made.

 

Would you mind sharing those part#s?

 

Its not the bolts that break. The people who know these motors best replace the rods. I have a low mile 330 here that already broke one rod.

 

The catalog is online and Ferrari is in the table of contents.

 

The catalog is tricky to navigate on anything but a desktop so here is a screen capture of the Ferrari section.

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Carrillo makes some great rods. About 15 yrs ago I had them make me some Cummins 5.9l rods for an 1,800 hp diesel drag motor that I was bending/breaking the stock rods in about every 10 or so passes! They held up great!
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My machine shop does a lot of hotrod Cummins work. I see those rods at his shop all the time.

1800 HP. Have any idea how much manifold pressure you were running? And max RPM?

 

Brian,

It was back in the infancy of diesel drag racing!

Twin turbo'd (compound) 5.9l common rail Cummins with a standalone Bosch ECU.

Made 100 lbs. of boost, spun it to 5,000 rpm
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Just as an aside, we have a set of lightly used and in excellent condition set of Carrillo rods for a 308 as well as a standard/standard 308 crank. We'd let the lot go to good home for $1500. They were spares that came with a race engine of our's and we don't see us ever using them.

-Prescott @ GSJFerrari

 

What does a Carrillo rod for the 308 cost ?

 

Seriously?

Because I can see that being ******** just as easily as it isn't ********.

 

I had heard 100lbs before but had no idea they were going 5000 RPM.

 

For a whole set. About the same as a new rod from Ferrari.

 

Can't do 5k with a stock ECU and the rotating assembly needs to be balanced perfectly.

They have come along way since I was involved in it.

Check out Ryan Milliken's X275 car. 3,100 hp and it turns 6,300 rpm!