Hi guys,

Could somebody explain the difference between carillo rods & oem's?

My engine is having a colmplete rebuild and I'm considering carillo rods...

TIA

 

I would not bother replacing the rods unless your power is way beyond stock since the stock rods are just fine. Replacing them will not get you any more power. If you are concerned with high revving and want extra strength then I think your money would be better spent on improving the valve train with better springs and lighter retainers.

However the rod bolts are another matter...definitely go for ARP bolts over the stock ones. If the rods/pistons are going to fail it will be the rod bolts.

Just my 2 cents...

Cheers,

Mike

 

Hi Mike,

I have a 3.8 engine so I thought that it would give an extra insurance? Any tips for more hp?

Thanks

 

The 993 rod is a departure from the rods used in the previous 3.2 Carrera, 930, and 964. The 993 rod is smaller in most of the dimensions and is the same rod used in the 993tt and 996tt so you can figure the rod will handle about 450hp and 7000rpm in stock form. If you are increasing the RPM limit of the engine, or the torque substantially, then it would be a good idea to go with a stronger rod like a Carrillo rod. The Carrillo rod is an 'H' beam design so it carries the loads differently than the stock rod and by design is much stronger. The rod bolts are also 3/8" rod bolts and are very, very strong.

When the 996tt engines have rod issues, the rods are bending but not having rod bolts break. This is more a function of the compressive loads from the higher cylinder pressure on the rod rather than the tensile loads from increased RPM.

If you have the engine apart, I would replace the stock rod bolts with ARP or other good quality rod bolts. I'd also verify the balancing of the stock rods, I believe Porsche's spec is within 7grams and I'd like to see under 1 gram of difference.

 

Replacing the rod bolts with arp is a very good tip!

They are going to replace the crank shaft, so I was wondering if its standard procedure to re-balance the rods etc...

Thanks

 

Sorry if I missed an earlier post, but what was the nature of the bottom end failure?

 

Hi geoffrey,

You can find all the information in this thread:

https://rennlist.com/forums/993-forum/274715-need-help.html (Need help)

Thanks