Raider Posted October 23, 2011 Share Posted October 23, 2011 I am thinking of lightening the flywheel on my 2000 and there's certainly plenty to go at!I am also aware that I would lose some torque so what kind of amount should I take off and what effect would it make? I realise the lighter it is the more uneven slow running I'll get but the faster the pick up but has anyone any figures or thoughts?Cheers. Link to comment Share on other sites More sharing options...
thescrapman Posted October 23, 2011 Share Posted October 23, 2011 I would have thought the starting point would be the weight of a Mk1PI.And then a bit more.See what a Vitesse one weighsCheersColin Link to comment Share on other sites More sharing options...
andy thompson Posted October 23, 2011 Share Posted October 23, 2011 Well a vitesse / GT6 Flywheel is about half the weight of a saloon one - so if you can get it that light you are doing well - easiest to get an exchange one probably - http://www.chriswitor.com/proddetail.php?prod=151214L and you will need to get the bottom end balanced afterwards - out of balance flywheels are horrible.There are pretty much no disadvantages to lightening up that boat anchor of a flywheel - Mk1's have a nice light flywheel and are torquier than Mk2's Link to comment Share on other sites More sharing options...
andy thompson Posted October 23, 2011 Share Posted October 23, 2011 thescrapman wrote:I would have thought the starting point would be the weight of a Mk1PI.And then a bit more.See what a Vitesse one weighsCheersColinIf you go too light with a Mk2 flywheel you will wear it in your kneecaps ..... (scared)(dead) Link to comment Share on other sites More sharing options...
Richard B Posted October 23, 2011 Share Posted October 23, 2011 http://www.chriswitor.com/proddetail.php?prod=151214LWell worth doing. Chris reckons on getting a MkII from 25lb to 17lb. If you look at the photo its quite sculpted and very thin at the ringear.You lose a little bit of torque on take-off. But I think its only really relevent for heavily loaded cars or towing.Ha ha. Too late I see :B Link to comment Share on other sites More sharing options...
andy thompson Posted October 23, 2011 Share Posted October 23, 2011 I am fitting a standard Vitesse flywheel to my next 2000 (2100 EFI screamer (evil)(evil)(evil)(evil) ) engine in a saloon - I will need to modify a Dolomite sprint bearing carrier to compensate for the thinner flywheel but other than that I see no issues. And it cost me 25 quid off ebay.... bearing carrier was free and 20 minutes on the lathe should see it all good. :)http://www.ebay.co.uk/itm/TRIUMPH-VITESE-FLYWHEEL-/310352028295?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item48426c2287Heres one for the taking - peanuts - it may be a Mk1 flywheel which would need he holes redrilling on a pillar drill and a slight counter sink applied Link to comment Share on other sites More sharing options...
James Posted October 23, 2011 Share Posted October 23, 2011 I have a GT6 flywheel on my saloon engine — works well :) Link to comment Share on other sites More sharing options...
Raider Posted October 23, 2011 Author Share Posted October 23, 2011 Thanks all - just the kind of info I was looking for Link to comment Share on other sites More sharing options...
Radders Posted October 23, 2011 Share Posted October 23, 2011 jcarruthers wrote:I have a GT6 flywheel on my saloon engine — works well :)So did you have to modify the carrier or do any other mods? The PI engine I bought for Gertie last week came out of a GT6 and still has the GT6 flywheel on it. I was thinking of using this as well? :-/ Link to comment Share on other sites More sharing options...
James Posted October 23, 2011 Share Posted October 23, 2011 As Andy describes. Link to comment Share on other sites More sharing options...
Radders Posted October 24, 2011 Share Posted October 24, 2011 Better start looking for a dolly sprint bearing carrier then. Any ideas anyone? Link to comment Share on other sites More sharing options...
andy thompson Posted October 24, 2011 Share Posted October 24, 2011 If it gets too hard I may be able to source a few - most Sprints are dead (dead)(dead) in WA but their gearboxes live on in TR's and saloonshttp://www.rimmerbros.co.uk/Item--i-UKC551-URimmers have them for 20 quid - Now I need to remember how much thinner a Vitesse Flywheel actually is - I think :-/ its 5/8" or 16mm (conicidentally or not the difference between a long back and short back crank) - which is how much longer the carrier needs to be - anyone? Link to comment Share on other sites More sharing options...
Nick Jones Posted October 24, 2011 Share Posted October 24, 2011 I measured this earlier in the year:The difference between the Vitesse flywheel and Mk2 PI flywheel (both mounted on my PI shortback crank) was 12mm with the Vitesse one further forward. Call it 1/2" if you prefer - it isn't that critical. I'm sure that in the past someone told me that there is an actual Triumph part that is the right size - unfortunately I can't remember what from.... You could machine a Sprint one down for sure - it's alot longer. I have one now, but didn't when I really needed it!I also noted that the resting position of the clutch diaphragm fingers moves back 7mm during the life of the clutch as the friction plate wears down. According to Buckeye Triumphs approx 4.5 - 5mm stroke is needed to release the clutch so that means a total travel of 13mm from new clutch, dis-engaged to worn out clutch, engaged. (Useless trivia probably but I was plotting a concentric clutch at the time!)Nick Link to comment Share on other sites More sharing options...
GT6 M Posted October 24, 2011 Share Posted October 24, 2011 I did mine by drilling 18 mm holes all the way around the outer edge,done this way, you still got alot of meat in the center bit.got rid of quite alott of weight.GT6 flywheel as wellwhen you got it off, look at the holes, some times they are elongated. and I think the bolts as standard are too short, as the shank does no go into the back o the cranklonger bolts,and a drill of the crank to get the bolts to act as ..dowels.. not just clamping as originalsMarcus Link to comment Share on other sites More sharing options...
Lord Sorbington Posted October 24, 2011 Share Posted October 24, 2011 A certain Mexican gentleman swapped the 28lb original on his 2000 for one which had been machined down to about 20lb.You couldn't really tell the difference on a standard engine. Link to comment Share on other sites More sharing options...
Richard B Posted October 24, 2011 Share Posted October 24, 2011 sorbs wrote:You couldn't really tell the difference on a standard engine.Yes you can. Link to comment Share on other sites More sharing options...
smithy Posted October 24, 2011 Share Posted October 24, 2011 Richard_B wrote:Yes you can.There's only one way to find out! FIGHT!!! Link to comment Share on other sites More sharing options...
Lord Sorbington Posted October 24, 2011 Share Posted October 24, 2011 smithy wrote:There's only one way to find out! FIGHT!!!Isn't there a more scientific way.............. ;DI honestly didn't think there was much difference so as usual, the best advice is to drive cars with standard / lightened flywheels and see which you prefer. Link to comment Share on other sites More sharing options...
Raider Posted October 25, 2011 Author Share Posted October 25, 2011 Well the engine is in bits and with one view that it doesn't make much difference and quite a few saying it's a benefit there appears to be no downside.Especially as my son in law will do the necessary machining foc ;) Link to comment Share on other sites More sharing options...
Matt George Posted October 25, 2011 Share Posted October 25, 2011 I've got a Witor lightened flywheel on my 2000, so 17lb instead of 25lb I believe. It doesn't make a massive difference, but a difference is noticeable nonetheless. Marginally quicker at picking up revs as you move off.If you have the 'box out already, and can get the machining done FOC, I'd say it's well worth doing :) Link to comment Share on other sites More sharing options...
JohnD Posted October 25, 2011 Share Posted October 25, 2011 Unless you can go for a steel flywheel, that will allow holes in it to max lightening, I think that 17lbs might be a bit too much, but I have a 9kg cast iron one (19lbs). Don't forget that metal from the outside counts for most.Mine mainly lightened by 'scalloping' the outer edgeof the friction platform, between the cluitch cover bolts, where it doesn't play any frictionpart, a bit like this Link to comment Share on other sites More sharing options...
shedmonkey Posted October 25, 2011 Share Posted October 25, 2011 This is the one on the TAXI and yes you can tell the difference over a standard one Link to comment Share on other sites More sharing options...
shedmonkey Posted October 25, 2011 Share Posted October 25, 2011 this I meant http://www.chriswitor.com/proddetail.php?prod=151214S Link to comment Share on other sites More sharing options...
Matt George Posted October 25, 2011 Share Posted October 25, 2011 http://www.chriswitor.com/proddetail.php?prod=151214L Link to comment Share on other sites More sharing options...
KeithBaker Posted October 28, 2011 Share Posted October 28, 2011 Amonst all the spares and XJB303H and 304H,we (BJEnglefield and myself) obtained from Comps.after the WCR there was a dural flywheel off a rallycross works 2000,if I remember(40 years ago so it was in the dim and distant past) it weighed in at about 8 or 9 lbs with the ring gear.The comps idea was that the crankshaft mass was more than capable of compensating for the loss of weight on a standard flywheel, we never used it as we were only interested in rallying in those days,wish we still had it would have been interesting to see how it performed. Link to comment Share on other sites More sharing options...
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