Engine Rotating Assembly Balance Question Please

[Mac Attack]

Hello,

With my engine rebuild, I will have the rotating assembly balanced because of the new pistons and rod machining.

With our internally-balanced engines, should I balance the rotating assembly with the clutch and engine dampener installed?

Clutch is the RPS twin carbon and engine dampener is a new OEM one. SOS says on their website the clutch is pinned and balanced at the factory. I find it hard to believe a small imbalance in the small, light engine dampener would make much of a difference too.

Just curious what the pros recommend please. Thank you!

Dave

 

[greenberet]

Have a look at this page describing the balancing Honda carried out on the NSX-R crankshaft assemblies: http://world.honda.com/NSX/technology/t5.html

According to Honda, they balanced the crankshaft with the "clutch cover, flywheel, and pulley" installed.

 

[Hugh]

I find it hard to believe a small imbalance in the small, light engine dampener would make much of a difference too.

At 8000+ RPM I wouldn't take any chances. Give Chris at SoS a call.

 

[goldNSX]

One question about blueprinting. If you need a new clutch and replace the flywheel will the blueprinting be lost? I guess that that's the case.

 

[Mac Attack]

Have a look at this page describing the balancing Honda carried out on the NSX-R crankshaft assemblies: http://world.honda.com/NSX/technology/t5.html

According to Honda, they balanced the crankshaft with the "clutch cover, flywheel, and pulley" installed.

Interesting. Thanks! I wonder if that means our engines were balanced to within 0.1grams (kinda like the performance rebuild standard), and that means the NSX-R was balanced to within 0.01 grams? Wow! From what I've seen, most machine shops only do to 0.5 grams.

At 8000+ RPM I wouldn't take any chances. Give Chris at SoS a call.

Thanks Hugh, that's what I thought too. Until I read on SOS's website that engine balancing is an option on their rebuilds, even with the Stage 1 forged piston builds. Everyone else says to rebalance. Then the question becomes, well, to what standard

Dave