Hi,
I was wondering how many people with LWFlywheels have had there motors blow because of crank walk? Tonight, at a meet I was talking to a guy who works for a nissan dealership. He says LW flywheels cause crank walk. I had no clue what that was so he explained "it's when your crank becomes unbalanced and starts moving side to side"
I was wondering if this is true with our motors and has anyone experienced it.


-Josh

 

only cars that have actually ever had a documented case of thise "crankwalk" were the 2G DSM cars, and that was due to a weak or poorly built engine. IMO, the VQ is a pretty strong motor, so i doubt that such a thing can occur on this engine at all. plus if this had happened, i am sure it woudl have been posted here long ago

 

^+1

There is a large number of people with LW flywheels in there Z's, some with 8lb tiltons and they have never reported a blown engine or engine damage from them.

 

How much does the LW weigh ? I wasnt familiar with the term but understand the concept ----Its, I would think a question of balance. Or if the FW is too lite, then the imbalance of the clutch assy would zero out one of the FWs jobs which is to keep the balanced assy as a whole in chk (Crank,rods,etc)

 

I just don't see it as a problem for our cars. It could be at a certain weight that "walk" is experienced. However, I doubt that Nissan (Nismo) would release a light weight flywheel (even though it is heavier then most at 21lbs) which could harm the engine.

There is the possibility that something as light as an 8lb Tilton could have adverse effects but I think that "walk" was something more associated with earlier engines that required the flywheel to act as an inertia damper of sorts.

 

Ironically crankwalk has been reported on the almighty MKIV Supra as well.

Don't worry about it.

 

Same thing I was thinking. I just wanted to make sure, because I been beating on my car with Its LW flywheel for about 16000 miles now with nothing going wrong.

Thanks

 

have you seen how the bottom of a Z motor is constructed?

crank walk is not in its vocabulary

 

Crank walk is nasty...
We had a Tiburon with a Supercharger that had crank walk, where the crank actually was able to be pulled and pushed into the back of the motor about 1/4" each way...The Kid came in for a clutch job, and wound up doing a motor and tranny... His crank was actually pushing his clutch and flywheel so far back that it started to grind away at his actual transmission case..

 

its not due to a weak motor....its just it was very porly built due to having 7 bolts instead of 6 bolts.....stupid idea i must say because thats very off balance. what where they thinking????

 

I think you may want to start going to a different Nissan dealership. Crank walk is not a problem on the Z.

 

I don't want to be rude man, but you shouldn't post stuff you don't know to be true. Opinions and facts are two different things.

Do you realize what you're even saying? You happen to be completely wrong

Evo's have 7 bolts cranks too - in fact, every Evo dating back from the Evo III had a 7 bolt crank. It was a inconsistency in assembly from the US factories, not an issue with the design of the motor (the crank doesn't care, nor know, how many bolts it has, and the number of bolts has no bearing on the ability of the crank to be properly balanced, etc).

 

Are we talking FW Bolts ? If so +1----doesnt matter odd or even--4-5-6-7-8 or 9

 

Tilton 8lb here.. no problems for over a year.