I installed lightened steel flywheel from RPM Performance, australia toghether with counterweight (used series 4 auto ?) and new clutch and damn thing is vibrating like **** in higher rpm's....

i used 6 new bolts same lenght for bolting flywheel onto counterweight and new long bolts for clutch, 6 bolts same size

all pictures could be seen on

http://rx7cz.net/photos/stuff1/page_02.htm

http://rx7cz.net/photos/works14/

what could be problem and how to solve it ? bolts ?

Exept vibrations (which u could feel really easy either revving car in neutral or drivin) its running good, clutch is really cool....

 

Either you put in the wrong counter weight (unlikely if you bought the set up from someone that knows what they're doing assuming you have a S4), or you have a bad Tranny mount (cross member brace with rubber bushing in center.

Other possibilites, but most likely one of these two.

 

how could i check that tranny mount ? how does looks like good one ?

I bought set (clutch/flywheel/counterweight) from shop who should know what they are selling and yes, we are talking 87 TII

 

Does it do it if you rev the engine while the clutch is disengaged ( pedal on the floor )?

If so, that narrows it down to something solely engine related...Probably something you just did wrong with the flywheel.

If it DOESNT do it with the clutch disengaged, then its a problem with the tranmission.

 

If the shaking/vibration happens while reving the engine while it is out of gear, then that (unfortunatley) lends focus to an incorrect counterweight.

The Tranny mount question, the center of the cross member has a rubber bushing where a center bolt goes. The center part of this bushing is connected to the barrel part via (as I recall) three fingers. These fingers break, removing any support the bushing would otherwise give. Only solution is to replace the whole thing.

It would be good to confirm your counterweight indeed came out of a S4.

 

hehe

I came up with all those observations while trying to diagnose a vibration on my buddies Miata. ( I dont normally sit around thinking about stuff like that )

Turns out it was, oddly enough, his timing belt.

 

its not mount ;(

for all types of lightened flywheels i could use any counterweight or whats the rule there ?

 

anyone got ideas what to measure and how to machine counterweight to get it correct ?

 

please help ;(

 

i got answer from Tim, he said he sent me correct counterweight, so i`m lost.....

How do i check that counterweight is correct and matching my lightened flywheel ? Any info about weights/measurements/ratios???

 

I get vibrations also when my car is in netrual. From 1k to 3k i can feel something spinning on my steering wheel and on the shifter. I haven't replaced anything yet, so i can't figure out what it is. Maybe it is the transmission mount.

 

I've heard all light flywheels use the automatic tranny counterweight, but I could be wrong.

I would say its the counterweight from what it sounds like. Or possibly the tranny input shaft slightly warped? Thats the only other thing that would be in contact with the engine when the clutch pedal is pressed.

I just recently fixed a problem with my lightened flywheel and clutch that I installed back in May.
Turns out the flywheel nut was backing off and letting the flywheel rattle back and forth on the axis from the front of the car to the back

Anyways, good luck with it!
Geoff

 

Well, i will probably take out tranny, check all bolts on clutch, then on flywheel/counterweight and if nothing will looks loose, i`ll put on old flywheel and old clutch to see if that was problem.....it doesn`t look like tranny mount to me, i already checked it and seems to be ok

 

Geoffman

What exactly was doing your car ? Was it drivable ? I drove my car for like 20 miles now, its just vibrating like it wasn`t before.....not something crazy, but noticeable...

 

Mine wasnt vibrating really. It was knocking from the flywheel being loose.
It was driveable, but it was getting to the point where I was worried about what was wrong and didnt want to damage almost a grand in clutch and flywheel parts.
What I mean by getting to a point is, it would knock pretty bad at idle and part throttle in gear. And what really got me was it would rattle at a high rate like a buzzing almost, and sometimes it would hang causing the engine to buck.
Things *hanging* in the drivetrain is obviously bad so I pulled it, found it was the nut backing off, tightened it, and I just need to get my new exhaust shortened a bit and she'll be running again

 

Well....i don`t feel any freeplay on flywheel when i check it from lower cover and don`t hear anything....it just vibrates really like not balanced or incorrect counterweight

 

Neither did I. I realized after I took the tranny out and it did move was, the tranny input shaft was holding it in place.

Sadly you seem to be at the point where you have to take it apart to find out whats wrong

 

yep ;( would let u know guys

 

got idea it might be leaking exhaust manifold or something like that, so before taking out tranny, i`ll wait for my hybrid, exhaust manifold and downpipe

its drivable, but i don`t have money for gas anyways so i`ll give it break another month or so....

 

I digged out engine today, i have problem with water leaking into intake (might that be reason for vibrations ?) I`m sure thats the reason for my poor idle, but don`t know about vibrating...

Nothing was loose on clutch/flywheel, i`ll take it for balancing to see if there is anything wrong.

Could using 6 mm longer bolts than stock ones for clutch cause vibrations ? All bolts i`m using are same lenght...

Before fixing water leak in lower intake manifold and swapping anything, i`ll try it with stock flywheel and clutch to see if its vibrating or not...i just hate that install and removal procedure ... its taking too much time...but on other side its good drill to remove and install back your engine couple times/week ;o))

 

i hope everything works out becuase i just ordered the same thing today make sure you pm me and let me know if it was a clutch problem or just another engine problem thanks

 

is S5 auto counterweight heavier or lighter than S4 one ?

 

car running with old clutch/flywheel setup without vibrations so it must be counterweight ;(

anyone got weights of S4 and S5 automatic counterweights so i could find out which one i have ???

 

i hope they sand me the right onw...

 

have you got yours already ? could u weight it ?