Aasco flywheel is here.

[23109VC]

maybe I am reading this thread incorrectly... BUT it sounds like Jake is saying our engines are balanced from the factory.

if you do a clutch job, I am under the impression that in many cases the stock flywheel needs to be replaced due to wear.

so it comes off and a new one goes on.

Assuming you put on a LWFW, I can understand how you throw things out of balance, as it is a lighter part.

if, however, I put on a new OEM flywheel - even though it's a stock part - because everyhting has been taken apart and put back together - will it STILL be "out of balance" and potentially fail - just like it would with a LWFW???

if that is the case - then anyone who does a clutch job and changes out the flywheel now is on the verge of a crank failure??

i'm confused...

[Jake Raby]

First off, prevuious 911 engines had forged steel cranks, not cranks made of sintered material... I have only seen one 911 crank, two 914 cranks and two 356 cranks break in all my days with aircooled Porsches. NOTHING with this engine and the prior 911 or other Porsche engines is the same. The vintage Porsche engine was not designed to have a dual mass arrangement and the design is what is creating some of these issues coupled to the cheap ass materials used in modern engines.

The cranks in early engines were extremely strong and wll over built for the application, never confuse anything that the Porsche engine of yesterday and the Porsche engine of today may have in common. The only thing they have in common is being 6 cylinders and horizontally opposed-

Aasoco and other providers do not build engines and until our program came along not many people had ever torn into or rebuilt these engines. When a crank would break people would just discount it as an extreme case and would never even consider the flywheel as a source, until it happened twice to the same person.

Lots of components are manufactured without the manufacturer having direct interaction with the entire engine as a primary objective, so they may never see the things that their component actually does..

[JAAY]

So I sent my aasco flywheel to Jake Raby in exchange for a stocker. It will be interesting to see what he does to the aasco. Maybe well see a harmonic balancer in a crank pulley or something cool like that?

[Jake Raby]

Originally Posted by JAAY

So I sent my aasco flywheel to Jake Raby in exchange for a stocker. It will be interesting to see what he does to the aasco. Maybe well see a harmonic balancer in a crank pulley or something cool like that?

I'll be using that flywheel to attempt to collect data on engine harmonics with both a stock and LWFW in iterrations per second via a couple of new sensors that I have located that give analog inputs into my data acquisition system.

I may soon be able to see exactly what the engine feels and graph the differences for overlay comparatives. This could make my article very interesting.