LA964RS

How much does a stock 993TT Rod weigh. The Carillo's are supposed to be in the 540 grams range. Just wondering how much less weight there is there and if its worth the $$.

Thanks,

Acropora

You don't buy it for the weight delta I think, it's the ability to handle 550+ hp.

Kevin

Here are the weights

930 Rod 661 grams
993TT Rod 567 grams
GT3 Pankl Titanium Rod 421 grams

Buy them for there strength.. I have a new rod that I will be showing/selling in a couple of weeks..

ttAmerica RoadsterAWD

Dang Kevin....You've got new everything and Innovative too! Youv'e gotta be eating, sleeping, pooping Porsche 24/7 And you have a dyno too.....do I smell a specialized shop being opened in the great NorthWest??

Jaime

ps.....where does Pauter belong...how heavy, and is it stronger?

LA964RS

I know strength is one of the reasons. But I was interested in the weight as the lighter the reciprocating weight the faster the rev, etc. I'm guessing for under 500 hp you can get by nicely w/stock rods w/upgraded rod bolts, balanced, blue printed and of course magnafluxed.

Anyone do the rod bolt replacement?

Kevin

Jaime, I really enjoy these cars.. For the Porsche nut case, it's the dream job. All of you folk really do contribute to the further development of these cars and hardware.

Robert, I can install ARP rod bolts and have them resized and balanced, however you will have spent 1/4 of the cost of Carrillo's.. Pauter does make a good rod. I'd recommend the Carrillo's over the Pauter rods. I have nothing against the Pauter rods, they use to weld counterweights on my VW race cranks in the early 80's..

LA964RS

Kevin:

I grew up w/Donnie Pauter...they've always done good work...but I'm leaning towards either keeping the stock rods w/upading bolts, etc. or going w/Carillo's...just don't know that for the HP the motor will be putting out if Carillo's are the answer. Can you send me an email w/price for the work on my stock rods?....many thanks.

Gelatomonster

Kevin,

Could you share with us your view regarding pankl titanium. I could not find any detail description/comparison of pankl (unlike pauter and carillo).

Geoffrey

Another rod option is the Arrow Precision Rod Company rod from England which have the same 'H' beam construction as the Carrillo rod, but are lighter. They are recognized for having a very high quality rod and the cost is only slightly more than a Carrillo.

When I was looking at rod options for building my new 3.8 RSR engine, I considered Arrow, Carrillo and the factory Pankl GT3R Rods. Since I am using a factory GT3R crankshaft, I needed to have a rod custom made, because even the factory Pankl rod did not work for my application. There is a difference in wrist pin size between the GT3R and the 993RSR wristpin (or 993tt for that matter) and I didn't feel comfortable with boring out a factory rod and rebushing it for a larger wristpin and then running a piston that is almost 1/3 heavier than a GT3 piston the rod was made for.

I ended up with Carrillo rods out of convienence since they were USA based and I was desiging a custom rod with different clearances. I posted some pictures of the GT3R crankshaft and custom Carrillo Rod on the 964 forum.

Connecting Rods
GT3R Crankshaft and Oil Pump

Kevin

Gelatomonster, you can read this thread and see the Pankl rods. https://rennlist.com/forums/showthre...=quest+maximum This particular rod was fashioned after the Porsche 930 rod, so one can see the difference in weight. The rod journal diameters are smaller with the GT3R crank and rod. The length of the rod is longer.

Pankl is located in Switzerland, they provide there services to many racing teams, and OEM manufacturers. The Porsche GT3R uses this rod, and Ducati also uses there rods in there motorcycles.

Geoffrey

There are actually several different configuration of the Pankl rods used in the GT3R, RS, RSR, and Cup engines. One of the rods is actually the same length as a 930/964 or 993 Rod.

Kevin

The GT3RSR project engine does have the larger 128.23 centerline vs the 127mm centerline (center of rod journal to center of wrist pin bore) of the stock 993TT and 930. The wrist pin sizes for the 993TT and 930 rod is/are 23mm, vs the smaller 22mm of the GT3R rod. Enclosed are a pics showing the overall larger length of the Pankl rod and larger centerline. The Pankl rod is on the bottom, followed by the 993TT rod with the 930/964 rod on top. Different rod lengths have been used in different racing series and spec engine configurations.




One can look at my other thread with regards to bearing width between the rods.

Geoffrey

Yes, that is the middle length rod Pankl has made for the GT3 family of engines. The shortest one is 127mm in length center-to-center.

orleyd

Titanium rods were on my mind as I visited with vendors at SEMA this past week. Carillo is offering Ti rods for the 993tt which are machined from a forged Ti slug, (about $850 ea.). I am not a metalurgist but knowing how forging densifies the material and realigns the molecules, this seemed like a good place to start. Each order would be custom giving the customer options in length, pin bore, ect.

Crower will make a Ti rod to the customer specs for about $500 a copy, however they start with a blank that is cut from plate with a waterjet. The Crower rod can be either in an H beam configuration of I beam. He guessed if a steel rod were 500 grams, the Ti version would be about 350 and of equal strength.

Note the prices quoted were B to B pricing so they may cost more through a tuning shop.

It makes me wonder how Chevy can sell the LS7 crate motor for $12,000 with all the hot goodies in side.

Kevin, are you starting with a billet blank? Have you done a cost study to determine selling price yet?
Keep me posted.

K24madness

Carillo rods are $1,500-$2,000 a set with the car bolt option. Pretty cheap insurance for such a great margin of safety.