Any second hand lightened flywheels knocking about.
Discussion
Considering I have a fairly powerful Tvr that because it's a 4.6 is baby assed smooth, ok I'll be serious 
I'm just wondering if anyone has a lightened flywheel that will fit my 1999/ 2000 year 4.6 and will couple upto my Tvr Power supplied 500 clutch.
If not I suppose my next question is who do I buy them off new.
Thanks in advance Alun.
I'm just wondering if anyone has a lightened flywheel that will fit my 1999/ 2000 year 4.6 and will couple upto my Tvr Power supplied 500 clutch.
If not I suppose my next question is who do I buy them off new.
Thanks in advance Alun.
OleVix said:
V8tuner sells the 6.8kg one, V8D can also get it. The 500 one is 9kg. Get the 6.8kg one!
They both probably come from here. Unless they're just thinning down a bog standard one. http://ttvracing.com/product/rover-v8-184mm-race/?...
http://ttvracing.com/product/rover-v8-lite-for-9-5...
Edited by m4tti on Friday 30th December 21:13
m4tti said:
OleVix said:
V8tuner sells the 6.8kg one, V8D can also get it. The 500 one is 9kg. Get the 6.8kg one!
They both probably come from here. Unless they're just thinning down a bog standard one. http://ttvracing.com/product/rover-v8-184mm-race/?...
http://ttvracing.com/product/rover-v8-lite-for-9-5...
Edited by m4tti on Friday 30th December 21:13
m4tti said:
Ask ttvracing what they have for the Rover V8 and save your self some money...
I'll have a good luck at there site when I've got a bit of time. I better do some home work and check out other past threads so I can make some sense of it
Ok so those who have done this mod, did you/ can you notice any real difference at all?
I've got an aftermarket Ecu so feel reasonably confident we could dial out any idle issues.
Tvr Power will do the work
Ole your suggesting the lightest as possible,
My only concern is
As it stands with my standard flywheel (weight anyone?) and it's heavy flywheel the car still stops by shutting off the throttle like a set of rear brakes,,
By lightening it further am I not inducing this engine braking trait even more.
It seems to me my engines got high compression, is this compression over whelming flywheel inertia so lightening it will make little difference to that aspect anyway. I'll gain by having less mass to turn over on acceleration.
How will this effect engines balance
Is this just a bolt on and play mod or does it all need re balancing?
Sorry for the numptie questions but I'm sure with your guidance chaps and then Dom telling me what I'm really going to do I'll get my car closer to its peak
Edited by ClassicChimaera on Friday 30th December 22:22
I would of thought it would need to be dynamically balanced. I had my engine rebuilt by V8 developments, and my flywheel was all done by them as part of the rebuild. I've only got standard flywheel, but you can clearly see the holes drilled to balance it. With more HP than a standard engine it must make sense to have it done.
You balance the reciprocating parts/mass together. I.e. Crank, rods, pistons, flywheel, clutch housing.
From memory though places offer neutrally balanced flywheels so you can do straight replacement. The reduction in inertia is immediately noticeable in responsiveness.
From memory though places offer neutrally balanced flywheels so you can do straight replacement. The reduction in inertia is immediately noticeable in responsiveness.
Edited by m4tti on Saturday 31st December 13:56
m4tti said:
They both probably come from here. Unless they're just thinning down a bog standard one.
http://ttvracing.com/product/rover-v8-184mm-race/?...
http://ttvracing.com/product/rover-v8-lite-for-9-5...
I've emailed TTV Racing. http://ttvracing.com/product/rover-v8-184mm-race/?...
http://ttvracing.com/product/rover-v8-lite-for-9-5...
Edited by m4tti on Friday 30th December 21:13
Cheers guys
m4tti said:
From memory though places offer neutrally balanced flywheels so you can do straight replacement.
Don't understand how this is supposed to happen - your flywheel will most likely have holes in to balance out imperfect weight distributions throughout the entire rotating assembly, so just sticking on a neutrally balanced flywheel will surely mean the rest of the rotating assembly is now unbalanced as you will have changed the weight distribution at one end...?Dom
Dominic TVRetto said:
Don't understand how this is supposed to happen - your flywheel will most likely have holes in to balance out imperfect weight distributions throughout the entire rotating assembly, so just sticking on a neutrally balanced flywheel will surely mean the rest of the rotating assembly is now unbalanced as you will have changed the weight distribution at one end...?
Dom
Pretty sure only the 5 ltrs were balanced this way. And yes their flywheels are full of holes, as do their front pulleys have bits of bolts welded into them to do the same thing at the other end. So yes if you did this to a standard factory balanced 5 ltr it would upset it.Dom
However my 4.3 flywheel and im sure the 4ltrs do not have these holes in the flywheels. So therefore wouldnt be a problem.
Its generally considered that the practice of externally balancing the 5 ltrs in this way was not the best way to balance these engines, the preferred way is to have crank rods pistons clutch pulleys etc all individually balanced. What is known as an internal balance.
John Eales did my 5ltr engine this way. The result being the crank resembled nothing like what it did before it was balanced. Loads of metal removed and also losds of heavy metal added. It just showed how badly the standard 5ltr crank is balanced. The end result though was a super smooth engine at all rpms. That revved equally as well as my 4.3.
carsy said:
Pretty sure only the 5 ltrs were balanced this way. And yes their flywheels are full of holes, as do their front pulleys have bits of bolts welded into them to do the same thing at the other end. So yes if you did this to a standard factory balanced 5 ltr it would upset it.
However my 4.3 flywheel and im sure the 4ltrs do not have these holes in the flywheels. So therefore wouldnt be a problem.
Its generally considered that the practice of externally balancing the 5 ltrs in this way was not the best way to balance these engines, the preferred way is to have crank rods pistons clutch pulleys etc all individually balanced. What is known as an internal balance.
John Eales did my 5ltr engine this way. The result being the crank resembled nothing like what it did before it was balanced. Loads of metal removed and also losds of heavy metal added. It just showed how badly the standard 5ltr crank is balanced. The end result though was a super smooth engine at all rpms. That revved equally as well as my 4.3.
I'll be talking to Dom at Powers as he rebuild my 4.6 engine, before I do anything. However my 4.3 flywheel and im sure the 4ltrs do not have these holes in the flywheels. So therefore wouldnt be a problem.
Its generally considered that the practice of externally balancing the 5 ltrs in this way was not the best way to balance these engines, the preferred way is to have crank rods pistons clutch pulleys etc all individually balanced. What is known as an internal balance.
John Eales did my 5ltr engine this way. The result being the crank resembled nothing like what it did before it was balanced. Loads of metal removed and also losds of heavy metal added. It just showed how badly the standard 5ltr crank is balanced. The end result though was a super smooth engine at all rpms. That revved equally as well as my 4.3.
I'll not be Doing anything if there's even a vague chance it wil destabilise my rather nice engine.
Cheers for the info guys.
Some time ago was reading a ery interesting article on balancing and fitting lightened parts and their effects. This was with the MG-Rover K4 series engines some of which are producing over 300 bhp. The engineer involved found that many balancing machines were wildly inaccurate and only a few had the accuracy and capability to truely balance the engine parts. Altering balance by just bolting on lighter pulleys and flywheels not only upset balance but also introduced stresses that could and sometimes did destroy cranks and engines.
We are lucky in the RV8 is well proven and there's plenty of knowledge about, let alone companies who specialise in these engines.
Many guys have lightened flywheels with what sounds like little downsides.
The only time I feel the standard one is when you go on/off throttle rapidly, engine responds slower, sort of slow motion.
My main reason is to let the engine spin up quicker with less mass to get rotated.
Sort of an economy thing as much as power interest, why carry weight you don't need on the engine.
More and more I'm finding my Powers built re freshed engine was a good choice for me, I like a bit of power but I don't want to wear the engine out to quickly, it's a compromise, if I can get that last bit of responsiveness and most likely another hint towards better economy then I'm up for it as it's one of those things that should last years and the effects ever lasting.
If it does destabilise the engine then it's not really worth all the effort at all!
I think Dom might talk me out of it but you never know.
Many guys have lightened flywheels with what sounds like little downsides.
The only time I feel the standard one is when you go on/off throttle rapidly, engine responds slower, sort of slow motion.
My main reason is to let the engine spin up quicker with less mass to get rotated.
Sort of an economy thing as much as power interest, why carry weight you don't need on the engine.
More and more I'm finding my Powers built re freshed engine was a good choice for me, I like a bit of power but I don't want to wear the engine out to quickly, it's a compromise, if I can get that last bit of responsiveness and most likely another hint towards better economy then I'm up for it as it's one of those things that should last years and the effects ever lasting.
If it does destabilise the engine then it's not really worth all the effort at all!
I think Dom might talk me out of it but you never know.
Gassing Station | Chimaera | Top of Page | What's New | My Stuff