If using GT3 crank and already custom pistons, gt3 rods?

[Lukesportsman]

Still acquiring parts as trying to essentially build up an engine from scratch with the new 3.6 blocks (when , who knows but #7 I think is my number) coming out as both my 3.6 are too low mileage to tear down and 964 based.

Quick question, if planning custom pistons anyhow for moderate compression turbo engine: Can we run the GT3 style rods if we compensate for length in the piston height? I don't see the reason to spend more for custom rods that are shorter with heavier pistons. Please educate me if my thought pattern doesn't make since in air cooled cars.

Thanks in advance.

[Lukesportsman]

Its funny how my last two questions have brought such silence in areas I just can't see that I'd be first to question:

1. 964 heads under 993 towers/cams/hydraulic?
2. Can you use a custom piston to avoid the more costly custom length rod while using a GT3 crank?

[winders]

My race engine has a Motorsports GT3 crank with Carrillo GT3 rods (130mm) and custom CP pistons.

[Ollies930]

I have a GT3 crank with 3.0 Carrillo rods and custom offset Wiseco pistons to get back to stock height for a 3.3l turbo. The GT3 Ti rods are nice, but I did not trust them to hold up to extremely high boost. Basically the same reasoning you are using, but with 127.75mm rod length and 22mm pins. Thanks to the 22mm pins I could get the top ring land a little further down, which will help the top ring to survive extreme boost.

[r lane]

Talk to Henry Schmidt. He is a dealer for Carrillo and they can make you any configuration that you would like. Crunch the numbers, rod length, stroke, chamber, bore, and the compression. That will allow you to figure the distance from center of the pin to the piston crown.

[Neil Harvey]

Originally Posted by Lukesportsman

Still acquiring parts as trying to essentially build up an engine from scratch with the new 3.6 blocks (when , who knows but #7 I think is my number) coming out as both my 3.6 are too low mileage to tear down and 964 based.

Quick question, if planning custom pistons anyhow for moderate compression turbo engine: Can we run the GT3 style rods if we compensate for length in the piston height? I don't see the reason to spend more for custom rods that are shorter with heavier pistons. Please educate me if my thought pattern doesn't make since in air cooled cars.

Thanks in advance.

This is my opinion based on experience.

The earlier Turbo race engines from Porsche, 935, 956 and the two variants of 962 used Titanium Rods. I cannot think you would push your engine anyway as hard as they did with those race engines.

We have customer 962C race engines with rebuild rods and they give no issues. You can calculate the pressures placed upon the rod to see if they will be ok. As long as they are rebuild properly by experienced people you will be ok.

I would not take them to a production machine shop for reconditioning. Crack check, straight check, re bush SE, resize BE with new bolts and machine CCL same you will be good to go.

If you do have new pistons made, this is where you should direct your attention. Don't leave it to the piston supplier to do the design work for you. Have an experienced engine builder spec these out for you.

[racing97]

There was a thread on here involving William Knight I think it was superhero or some such and one of the threads someone posted they specs of a build and it had the specs for a build that had a CP piston with a 1.1+- compression height piston look it up and see if it works for you

regards

[Lukesportsman]

Yes, that was Scott Winders thread.

Thanks for all the feedback guys. It always helps to bounce ideas off others that have been there done that before.