SP6 Lightened flywheel

[PhilH42]

Progress refitting after stripping out the drivetrain has taken a hit due to work, but now I finally got round to placing a large parts order and its been delivered I'm wondering if I should of ordered a new lightened flywheel?

I've seen some good and bad comments with the RV8's (mostly positive) but not much on the SP6 and more specifically the Cerb...what's the verdict fellas, yay or nay??

[Jhonno]

Yes.

[ukkid35]

SP6 crank has significant rotating mass, so a lightened flywheel might not be a bad idea.

Not sure I'd want to do that on and AJP8 though, it must reduce idle smoothness, and would probably lead to embarrassing stalls when pulling away.

[fatjon]

Not noticed any significant change in idle quality with lightened fly on AJP. The clutch pack is also a pretty big mass so I think on both applications the flywheel has less effect than it would on lesser cars.

[Tanguero]

fatjon said:

ukkid35 said:

Not sure I'd want to do that on and AJP8 though, it must reduce idle smoothness, and would probably lead to embarrassing stalls when pulling away.

Not noticed any significant change in idle quality with lightened fly on AJP. The clutch pack is also a pretty big mass so I think on both applications the flywheel has less effect than it would on lesser cars.

That is also my experience. I ran a lightened flywheel on my 4.2 for years and now have the same flywheel on it in 4.7 guise. Idle is not noticeably different from normal but the engine is very much more responsive to the throttle.

Edited by Tanguero on Monday 20th November 14:57

[Byker28i]

I've a lightened on on my 4.2. Haven't noticed any difference if I'm honest

[PhilH42]

I've ordered it....no going back now!

[ukkid35]

Byker28i said:

I've a lightened on on my 4.2. Haven't noticed any difference if I'm honest

I stand corrected.

The possibility of stalling was something that Honda VTEC owning friends of mine had reported.

Not only that, but the price differential £500 (orig) vs £330 (light) for the AJP8 flywheel means I would probably take a chance on the cheaper flywheel if I needed to replace mine.

[tangerinedream]

I have lightened flywheel on my 4.2. It is more responsive, but you have to use more revs/be better with the clutch pulling away - definitely a risk of an embarrassing stall...

[Byker28i]

tangerinedream said:

I have lightened flywheel on my 4.2. It is more responsive, but you have to use more revs/be better with the clutch pulling away - definitely a risk of an embarrassing stall...

I've not found that with the torque of the engine, same with our diesel, which makes it very embarrassing when I jump into the MX-5 and forget to add revs...