Here's the situation. I am getting ready to put together my B16 with Golden Eagle 84.5mm sleeves. I have Wiseco rollerwave pistons (approx 12.3:1 comp with my combo). My head is a gsr head with titanium retainers, Jun springs, and Jun 3 cams. I am using a stock b16 crank. I have a ATS carbon clutch/flywheel combo (weighs 17 lbs total). I am going to use a b16 tranny with a 4.78FD. This is going in a 92 CX hatch (mildly stripped). I plan on revving the motor to 10,000 rpm (if it continues to make power). I have eagle rods. The problem is that the eagle rods, which are an h- beam design, seem really heavy. I am having second thoughts about them before putting the motor together. Would it be beneficial to use a lighter I-beam rod, such as a Crower or Pauter? Some people are saying that I will lose too much enertia with a lighter rod and not produce any torque. Does anybody have experience in this area? I mean if it was possible to make rotating assemblies too light, why would people use titanium rods?

 

It's not going to be a nice streetable car. You're building a race motor.. I hope you can shift gears fast!

 

Torgue isn't really produced/effected by the weight of the parts. If anything, your motor will run throught the RPM's faster because of less rotational mass. But you won't lose torque.

It will act something like a lightened flywheel. Your motor will rev faster since is has less rotational mass to accelerate. But like 4DeepCivic said, you will have to shift fast, because just like a lightened flywheel, when you take your foot off the gas to shift, the revs will drop a lot faster because the less rotating mass will not sustain the momentum of the engine as well. And with a lightened flywheel, light Rods they are going to drop fast! And with those to and a 4.78FD you are going to be zipping through the RPMs. So, daily driving will be a little more of a pain since you will have to be shift faster&more and be more consious of the revs during shift. But it's nothing you couldn't handle. Just take some getting use to. Everything is a compromise.


Now the following is just opinion. So ask around some more if you want:

But I wouldn't be that worried about the Eagle Rods. I think it would be more worthwhile to just get your rods & crank balanced. Plus, I don't know that your 84.5 B16's power band would be go up to 10k. Of course you'll make more power with more displacement, but I believe it is usually made lower in the RPM range.