Carrilo, and yes you need to balance the crank. The aftermarket pistons and rods can be significantly lighter than stock.

 

They are both very good choices and used by reputable shops who have their own spec of each:

Off the top of my head

Manley: AMS, T1,
Carrillo: SP, Switzer, Greddy, I also suspect the Cosworth branded rods are made by Carrillo

CP and Carrillo is a proven combination.

HKS does state that crank balancing is unnecessary if their rods are used due to the closeness in weight to the stock rods. http://www.hks-power.co.jp/en/product_db/engine/db/12685

 

Both solid choices.

Can't go wrong with either.

 

The fastest GTR in world uses Manley!

 

The winner of TX2013 unlimited drag uses Manley!

 

Manley, inexpensive and one of the best+ full line of graded pistons and upgraded wristpins available.

~Dv8

 

manley rods and pistons in my car and im very happy with them

 

Manley is the only company I know of that has graded pistons. I have been very happy with their product for the Vr38, we still do balance the crank when using Manley just for safe measure.

 

The Manley I beam is a very good choice and value. I use them in a lot of builds that a offshore H beam won't survive in. I personally feel like the threshold is about 175hp per rod that you can consider the offshore H beam inadequate. There is years of debate on I bean VS H beam and if you want to wear your eyes out start reading up! The Manley lightweight and standard I beam comes in at 733 grams. The intention was to offer a "drop in" rod that wouldn't create balancing issues. The heavyweight I beam comes in at 812 grams and I don't think it should be considered as you can create a balancing issue that may or may not be seen in the balancing machine as the "bob weight" or mass of the rod/piston/pin/rings in service can create harmonics outside of the factory rotating assembly values. Again in most builds around 200HP per rod the Manley rod is a shoe in.

The downside to the Carrillo is the cost. The material and manufacturing are still unparalleled, the real testament to this how at 604 grams it will live at almost anything you throw at it. One of the projects I'm currently working on will make 300HP per rod and be at peak power for 100 seconds at at time. I shopped and researched the different rods and the Carrillo was the only one that fit the bill. In another thread on the boards a member was asking about knife edging the crank or lightening the assembly as a whole. Well if light is what you're after spend the extra on the Carrillo. It's also worth noting that you're going to add weight to the piston program with the pin it will take to live at the higher levels.

When it comes time to build my GTR engine I'll just use the standard Manley I beam and put the extra money towards other parts. Even having the luxury of having "control" of the rate of engine acceleration with the automated trans and AWD traction takes a lot of stress of the engine. I think it's save to say the engine would have a tougher life if it were 2wd or had the error of misshifts and overrev conditions so from the valvetrain to rod bearings the GTR offers better longevity then earlier platforms.

Thanks.

 

Has anyone reported Manley or Carillio rod bent?

 

I don't know but that would be a freak accident if one did. Both of those rods are supposed to be able to take over 1000wtq.

 

curious why people are mix and matching

wouldn't it be wise to choose a company who match their pistons and rods - ie; cosworth short block kit, hks rods + pistons kit

 

Do of the shelf rods and pistons 'match' from the same manufacturer, I think your concern may be more related to companies that are doing custom rod lengths with modified wrist location on the piston.

 

I'm not sure if it would matter. If the pistons and rods are made to spec, then they should all be interchangeable. But I get what you're saying. Personally I would get the same band pistons and rods.

Sent from my SCH-I605 using GT-R Life mobile app

 

slightly off topic, whats the min required for a short block build to support around 850whp?

 

Pistons and Rods. You're at the limit of what many say on the valve train, so that'd be a budget question. You'd also have to consider the "while you're in there" costs, because you wouldn't want to do it twice or take a gamble on a few hundred dollars, such as head and main studs, cams, and upgraded balancer...

 

I would say Manley for sure. I would also use their pistons if I were you because they are much quieter and fit better.

I have used both CP and Carillo in the past, Manley is nicer stuff. I have two BENT sets of Carillo rods out of GT-Rs here at the shop...both cars were under 1100whp.

I personally don't have a problem with mixing components if someone makes something better, but right now Manley is the best stuff out there in my opinion.

domino_z: Pistons rods with a qualified engine builder and you will be just fine. If you want to get the absolute most out of your turbos then do the cams/springs... however it isn't 100% necessary. Stock heads/cams have made over 1100whp and gone 9.0 @ 164

 

Can you ellaborate how manley "is quiter and fit better"? I am not leaning toward Carillo, but it's much lighter iirc.

 

Thanks for the info guys

I would be shooting for around hks gt800 power levels

 

Less piston slap when installed right