m20b27 to m20b25 Flywheel/clutch questions.

[robintett]

Hey,

Im hopefully going to be swapping a m20b25 into my 86 325e. I think i have found most answers to my questions apart from this.

Will it be possible to use the flywheel and clutch set up from my m20b27 with the m20b25?

I read b27 has a dual mass whereas b25 does not? I will be using the gearbox/bell housing set up originally used with the b27.

Sorry if this is answered elsewhere already, I could not find it.

Thanks, Robin

[robintett]

No one have any input? Thought would be easy to answer, i am just completely new to e30's....

[merlinfe]

It will fit but its heavier. The single mass may allow the engine to rev up faster but will not slow down as quickly ( if it is lightened). Some see this as an upgrade to get up to speed, others see it as a downgrade because it effects how the car behaves when engine braking.

Bottom line: Do some research, save up, buy the best parts you can and DO IT ONCE. Quality parts will last longer and will be far more economical in the long run.

- Steve