FYI: Carrillo Rods

[JimmyMac]

Not sure if this info has been posted on this forum yet, but here goes.....

Just thought that I would let everyone know that Carrillo also makes rods for the Mazdaspeed 3/6. They actually have 2 different rods that they make. The Pro-SA (with wmc bolts) and the Pro-H (1 with wmc bolts and 1 with carr bolts). These rods are for pistons with a 22mm wrist pin (like CP pistons). So they do not work with the stock pistons with a 22.5mm wrist pin. However, in talking with Carrillo, they told me that they can modify their rods to work with stock pistons. There is enough bushing material to hone them out to fit the floating 22.5mm pin. They also told me they would be willing to stock them in house if there is enough demand for them. Now these rods are very pricey, but if there are some vendors out there willing to stock them, then I'm sure the price will come down. So far I only know of one vender who sells Carrillo, and that is JSCSpeed (yes, a vendor here). I know there are other vendors (SU, PG, P3, etc) who are working on their own rods. But this is so far the only other option besides the Pauter rods, and the only option so far that will fit stock pistons (when modified by Carrillo). If you want more information, please contact Carrillo. I am just passing on what they told me.

Here is a link to JSCSpeeds section.. http://www.jscspeed.com/mazdaspeed3/engine/rods.htm

 

[jeff4880]

the prices are about the same for any of there other rods. I have Carrillo's in my bike and they were 900.

 

[hyperpasta]

Have Carrillos in a couple of my Duc's and run Forged (aftermarket) and Cast (oem) Pankl Ti rods in the higher tuned 999R bikes. $3400 for two forged Ti rods....

I can run tighter squish clearances with the Steel Carrillos than with the cast Ti rods as steel doesn't stretch as much as the Ti rods. Ti makes for a great suspension/shock spring, Very light weight! $$$$$ Don't ask how I know....

Did I mention that the SR71 was made of Ti? (naughty)

the prices are about the same for any of there other rods. I have Carrillo's in my bike and they were 900.

 

[hyperpasta]

Another trick we do with Carrillos.....

Carrillos rods are much lighter than the stock steel rods they replace in the bikes I mess with. Everyone loves Ti rods but is backed off by the cost. The small end of the rod is pretty much pretty close or non negligible in it's effect on the rotating mass of the crank assembly, at speed. It's basically a pivot point. Piston mass has far more effect in the up and down motion of the piston in the cylinder and it's effect to change direction in the bore. Light Pistons are cool and matter more than small end weight of the connecting rod when building a balanced assembly, when comparing small end weights of rods....

The big difference is in the big end of the rod! That's where most all of the mass of the steel rod that spins comes into it's rotational effect. The throttle response or the motor's ability to spin up quickly when tapping the throttle. Of course in this engine builder tip I'm not considering the crank's mass when comparing rod big end weight, as the crank should be a constant in either rod scenario to make my point.

A simple trick is to remove some mass from the flywheel, the total difference between all four Ti and all four steel rods big ends. If you can remove this difference from the flywheel you have in effect created a rotating mass equal to a crank with Ti rods with a stock flywheel, while gaining the extra strength of the steel rods.

Of course the crank offers many places to gain performance as well, but this is just some food for thought on your choice of steel rods vs Ti rods and your pocket book....$$$$$$$ or where to spend your savings on your motor!

Light is Right!

 

[jeff4880]

For a dragrace applacation lighter is not always better. When launching from a dead stop a heavy rotaing mass is better to a point. For me piston weight is more inmortant then weight from the crank or flywheel for not only performance but bearing life.

 

[hyperpasta]

For a dragrace applacation lighter is not always better. When launching from a dead stop a heavy rotaing mass is better to a point. For me piston weight is more inmortant then weight from the crank or flywheel for not only performance but bearing life.

Sure on a mostly stock engine....if you spin up the motor and make serious power with a steel rod you'll squeeze the bearing shells out from in between the rod and the crank!

Here's a good link to a Aluminum rod manufacture. There is a reason these guys go with Aluminum. Now you can run them in street motors! It's all a matter of how much coin you want to drop into your motor.

http://www.bmeltd.com/rods.htm

"Why build a street engine with BME Rods? One reason is the "cool factor." Bill Miller Engineering Rods are unique, high-end racing parts and there always will be people who spend extra money to have the same rods in their engine as Tony Schumacher or John Force puts in his. More importantly, there are practical reasons for using BME Rods—the same reasons racers use them: less reciprocating and rotating mass due to their comparative lightness. That allows the engine to accelerate quicker and make more power as it does so. Lighter rods also improve throttle response and allow the engine to run reliably at a higher rpm than it could with steel rods."