Good afternoon people,
Is it worth it, for a car destined for 200bhp fast road use? I believe that the 1.6 flywheel is pretty light anyway?
Does is compromise easy driving too much?
Many thanks in advance.
Julian
I couldn’t say I noticed a difference. It would depend on how light, or how heavy the original.
Also depends where the weight is.
Really difficult question to answer.
In your position I would speak to a specialist such as Skuzzle for information.
I would also want to drive a similar output car with a lightened flywheel as reading up on this there are a number of effects that are a bit marmite depending on your use of the car.
Typically the engine revs freer but bogs down a bit on takeoff.
Lots of different varieties of lightened flywheel too and likely need a new clutch to go with it.
In summary, a lot of hassle for mixed benefit - I would not bother particularly with the extra horses you are planning.
The Mk2 1600 flywheel is the same as fitted to the M2-1001, and listed by Mazdaspeed. Also, UK Mk1 1600s had the same part. Regular JDM Mk1s had a heavier flywheel.
Ask on Miataforum; there are more knowledgeable people there who have fitted 1600 flywheels to 1800s. Stock NA6CE flywheel is 8.2kg, 1.8 is 8.9kg, Mk2 1.8 is 8.0kg, NB6 flywheel is 5.8kg. Still a kg heavier than the FM flywheel. That Skuzzle flywheel is 4.9kg and nearly £300. Not in stock.
Source:
http://www.geocities.jp/drift_roadster/b6bp.html
I fitted one to my S-Limited; previous owner had fitted a 1.8 flywheel and Spec2 clutch, which was hopeless. With a decent Japanese Nipparts clutch, the pickup was transformed. The NB6 flywheel cost me £20 from Autolinkuk. Garage skimmed and balanced it as part of a normal clutch fitment.
HI Saz,
I am interested in this. Did you find any irregularity or increased tendency to stall at low revs and out of Interest would you mind saying what the overall cost was including the clutch install?
Cheers
Matt
This was to replace a 1.8 flywheel and clutch fitted to a 1.6, fitting a flywheel that was standard to the M2-1001, MK2 1.6 and Mk1 UK 1.6, so the car drives perfectly normal, but a whole lot better than with the 1.8 flywheel. I supplied the parts (3-piece clutch, bearing, flywheel, some seals), garage charged about £150 in labour, including getting the used flywheel prepped.
Okay, understood.
Would be interested to know from anyone who has a lighter than standard flywheel how this affects the driving/running at low revs
Cheers
Matt
I have an IL Motorsport lightweight flywheel on my 1.8 mk1 ( c.160 bhp Blink stage 1), it weighs just under 6kg, down from the 8.6kg of the standard one I took off. No downsides to report, and it revs quicker, rev matching is easier, faster down changes, and generally livens the car up. No complaints at all.
I have assumed that the OP is working on the 115bhp(as standard) NA engine.
This already has a reputation for revving more freely than the NA 1.8 - perhaps one of the contributing reasons for this is the lighter flywheel.
I cannot see any benefit of fitting the heavier 1.8 flywheel to the 1.6 - only ever going to cause issue.
I had a Spec 11 clutch on my standard power VVi car. It was never a car that was a stranger to circuit. The pictures show the clutch after at least 30k miles of use. I sold it to someone else.
I then supercharged the car along with a lightened flywheel and 3 puck clutch. As you are not jumping with and without and back again I would honestly say I could not tell you a difference. The car idled fine, drove OK and felt no different in that department. Even the clutch, which I expected to be an on / off switch, just felt normal with normal bite. Of course more than one thing had changed though, the lighter flywheel could have been counteracted by the increased drag of a supercharger. However this, I would imagine, would have made it even more prone to stall, but there was none of it.
If I were doing this again, I would save the money as I saw no benefit to it.
The S-Limited referred to had previously had a FM2 turbo on it (onto a Tractec motor), and was used, for a while, for drag racing. I guess there are sound reasons for the fitment of the 1.8 flywheel in that situation. It was sold onto me with a Supercharger, but I have reverted to NA.
Two different flywheels fitted by the factory; JDM only had lighter flywheels in NA8C pase 1.5 and phase 2 cars.
Thank you all for the help with this.
I am now decided that I won’t bother with a lightweight flywheel, on the basis that the current 1.6 I have revs lovely and the added power is likely to be plenty to keep me happy.
Probably better to spend money on better suspension and brakes!
Kind regards
Julian
Or get hold of a 4.300 Torsen diff off a late model Mk1 Roadster
With a lightweight flywheel be prepared to stall it until you get used to it
You’ll find you need higher revs and have to slip the clutch a bit to pull away.