Flywheel to replace dual mass

[baggy798]

Sounds like maybe a worn bearing in the M90?

Depending on how much you needed to press the clutch to stop it, you could have made the clutch slave pushrod adjustable and lengthened it by a few mil.

I'm just fitted a TTV flywheel too. No noise at idle but gear clatter at low speed in 1st and 2nd gear. I've filled the gearbox with Redline Shockproof Heavy 75w150 gear oil (recommended by a guy running 540whp through his "dead quiet" M90). It seems to have reduced the noise a bit.

[ThePurplePanther]

Originally Posted by baggy798

Sounds like maybe a worn bearing in the M90?

Depending on how much you needed to press the clutch to stop it, you could have made the clutch slave pushrod adjustable and lengthened it by a few mil.

I'm just fitted a TTV flywheel too. No noise at idle but gear clatter at low speed in 1st and 2nd gear. I've filled the gearbox with Redline Shockproof Heavy 75w150 gear oil (recommended by a guy running 540whp through his "dead quiet" M90). It seems to have reduced the noise a bit.

I'll have to give that a try.

And i did suspect a worn bearing at 1st, but when i put a different dmf in, and dropped the boost to not bugger it, it went away.

Speaking to my local volvo specaialist he reakons some m90 chatter and some dont - luck of the draw.

But chatter is common on 4 pots as there is no overlap in the firing re crank rotation. Fires every 180 degrees so 4 bangs per 2 spins of the crank which means the pistons get back to their start before the next fire happens to spin the crank, a dmf being heavier and internally sprung, damps these shocks out so they don't hit the gears, and at speed they happen so fast as to be unnoticable - that was my takeaway from talking to a number of people about it (mechanics and race engineers who almost always use smfs)

5 and 6 pots have overlap (fires every 144 and 120 degrees respectivly) so shouldn't be such a problem - will find out soon as i have a single (and v.light) flywheel to go on my t6...

PP