V6 - lightened flywheel?

Anyone know of a company that sell or could make a lightened and balanced flywheel for an Alfa V6? I've been thinking about getting the clutch done and a Q2 diff installed, and it would make sense to fit a lightened & balanced flywheel at the same time. I know the pro's and con's of a lightened flywheel, and I think with my low ratio 2.5 gearbox and high rev limit my 3.0 V6 is an ideal candidate and would benefit a lot from the increased revviness a lightened flywheel would bring.



Also, does anyone know if the standard flywheel a dual mass one like in the JTDs?

De 3.0 V6 engine got a dual mass flywheel. So fit a 2.5 V6 of 3.2 V6 flywheel, they´re singe mass. Buy a used one, they´re cheap. And fit a new GTA clutch. You will save 5-6 kgs.

And fit GTA intake cams and do chiptuning. It makes the engine much more powerfull after 5500 RPM. No fall back in power until you hit the revlimiter at 7200 RPM

The basic mods for a 3.0 V6 engine.

Cheers for that! Already got a Dastek Unichip running, will be fitting GTA cams or AHMotorsport fast road cams next time it needs cambelt change..

Autodelta do a lightweight clutch kit for the GTV V6 3.0. It's not on their website, but ring them and ask them.

I have a Q2 on my GTV and a lighter single-mass clutch from a 3.2 GTA on my GTV.

The 156/147 GTA flywheel is the lightest of the OEM V6 flywheels @ about 8kg.
The same flywheel was also used in the 3.2V6 GT & GTV/Spider.

Originally Posted by David C

The 156/147 GTA flywheel is the lightest of the OEM V6 flywheels @ about 8kg.
The same flywheel was also used in the 3.2V6 GT & GTV/Spider.

Just like my 2.5 V6 flywheel, 8 kgs
The clutch is 5,5 kgs.

Originally Posted by ClaSSiC

Just like my 2.5 V6 flywheel, 8 kgs
The clutch is 5,5 kgs.

The GTA flywheel is about 0.5kg lighter than the 2.5V6 flywheel.

Does anyone know if it would be possible to go any lighter than the GTA flywheel? I'm noth sure whether my 3.0 V6 has the DMF fitted at the moment or the single mass flywheel that was previously on the 2.5 engine it had fitted before it shredded that belt..

You could go lighter, i'm sure. Just a matter of removing material in the right place or maybe buying a new aftermarket flywheel?

Wouldn't mind a lighter one for my GTA engine.

The closer to the edge the material is removed from the more effect it has.. I think getting one made up would be very expensive unless it was a bulk purchase.

Originally Posted by David C

The GTA flywheel is about 0.5kg lighter than the 2.5V6 flywheel.

Not really. I weighted them, both 8kgs.

So, the theory for lightening the flywheel would be to remove an equal amount of material all the way round but without disturbing the area of counterbalance?, at the same time making sure that the thing won't grenade itself?

Any engineers out there care to comment on the best way? Maybe a series of holes around the perimeter or thinning the outer area?

John.

I am putting a Q2 and new clutch in my 156 2.5 next week, I had not given this much thought but I think I will be off to the engineering shop I use to see what can be done, I will let you know the out come.

Ned

Originally Posted by Autolusso

I am putting a Q2 and new clutch in my 156 2.5 next week, I had not given this much thought but I think I will be off to the engineering shop I use to see what can be done, I will let you know the out come.

Ned

Be very interested to hear of the outcome as well. Once you know how much you can lighten the flywheel by you will be able to use this page:

Puma Race Engines Technical Guide - Lightening Flywheels

To work out how much effective mass you will have removed from the car in each gear.

Now to find that competent automotive engineer Eh! Pud? Good techie link mate, excellent in the way it was written.:

Originally Posted by zulu ferret

Now to find that competent automotive engineer Eh! Pud? Good techie link mate, excellent in the way it was written.:

As a mathmatician/physicist these sorts of scientific explanations always appeal to me

I still think the flywheel is balanced with the crank.

Originally Posted by Chris155

I still think the flywheel is balanced with the crank.

Do you think they are balanced as a pair from the factory? Wouldn't that mean that you would need to check a new flywheel balances with the existing crank due to differences between flywheels due to manufacturing tolerances? Or do you think they are differences between individual flywheels would be so fine as to not warrant the need for checking to ensure balance with the existing crank?

Originally Posted by Pud237

Anyone know of a company that sell or could make a lightened and balanced flywheel for an Alfa V6? I've been thinking about getting the clutch done and a Q2 diff installed, and it would make sense to fit a lightened & balanced flywheel at the same time. I know the pro's and con's of a lightened flywheel, and I think with my low ratio 2.5 gearbox and high rev limit my 3.0 V6 is an ideal candidate and would benefit a lot from the increased revviness a lightened flywheel would bring.



Also, does anyone know if the standard flywheel a dual mass one like in the JTDs?

Tyr Farndon engineering, farndon racing engineering crankshaft manufacturer coventry uk, they will make one for you, but be warned, they are expensive...
I had them make a crank & two flywheels for my Audi Quattro a few years ago, excellent machining, I think the flywheels cost me approx £400, that was about 9 years ago though..

Originally Posted by zulu ferret

Now to find that competent automotive engineer Eh! Pud? Good techie link mate, excellent in the way it was written.:

Yeah nice link dan

Originally Posted by GhostyDog

Yeah nice link dan

Was that one of your links? Someone pointed it out ages ago and I bookmarked it.. Was it you?

Originally Posted by Pud237

Anyone know of a company that sell or could make a lightened and balanced flywheel for an Alfa V6? I've been thinking about getting the clutch done and a Q2 diff installed, and it would make sense to fit a lightened & balanced flywheel at the same time. I know the pro's and con's of a lightened flywheel, and I think with my low ratio 2.5 gearbox and high rev limit my 3.0 V6 is an ideal candidate and would benefit a lot from the increased revviness a lightened flywheel would bring.



Also, does anyone know if the standard flywheel a dual mass one like in the JTDs?

Call Dawie de Villiers of Glenwood Motors in South Africa , he has been modding Alfa Romeo's from the 70's. His website address is ::Glenridge Motors:: - Home and you can get all his contact details on the page. I got my GTA inlet cams from him for my 166 3.0 + he will give you lots of advice other tuners try to keep to themselves..