as above anyone use one ? good/bad ?
cheers

 

Bad, no need to do it! (lightening) Balancing good!

 

as said; def balance but i wouldnt lighten; not really worth it -plus if you do, you'll lose torque

 

i agree with the above comments,i had one in my old xr3i that had alot of work done to the engine,and the flywheel was too light to balance at normal tick over.

 

had a few variants, on a rs engine i wouldn't bother lightening on n/a i would lighten it.
defo get it balanced, always a benefit on helping the bearings.

 

Lose torque??!!

That's not true, what you will lose/gain (however you want to look at it) is momentum.

Just as a light flywheel will allow the engine to rev faster, it will also make it lose revs faster when you come off the throttle, meaning that you may fall out of the powerband on gearchanges.

Mine has run a marginally lightened flywheel for years and to no ill effect. I have never been able to measure any gain, but its like anything, its hard to prove/disprove.

 

Its a known fact they decrease the torque output and cause the revs to drop quicker on a turbo which is exactly what you dont want as it will increase the time it take to reach full boost again through the gears.

It all comes down to what the car is going to be used for, if its a N/A CVH used for circuit racing then lighter would be ideal in this situation as you require a snappier response on the pedal

 

I'm sorry, but I'd have to see evidence before I believed that.

My opinion is that a light flywheel doesn't affect the amount of torque an engine produces. OK, so the way that torque is delivered is changed due to the car dropping off RPM's faster versus your own ability to change gear fast enough

The flywheel is driven by the engine, so if anything I'd have thought power to the wheels would increase, just in the same way as improving other transmission components would have that effect.

 

Yes the engine drives the flywheel but also if you think about it the flywheel also drives the crank through the inertia of the flywheel rotating. In a crude way the flywheel "helps" the engine along and this is why it increases torque. I agree that lightening only by a small amount probably wont make alot of difference but shaving kgs of the rotating weight certainly will.

 

do you even know what and engine is christian

im laughin at this point, an automatic car has no real flywheel, just a ring gear for the starter..............

does this mean it has less or no torque?? B19 CVH

NO

 

by the way i do realise what back ground of car modification christian comes from, and his thinking supports mine before anyone thinks im slating him

im only writing this as im at home ill and bored

 

perhaps its my primitive understanding - i was under the impression the lighter the mass the more torque is needed to keep it rotating?

maybe i'm completely wrong, to be honest i havent looked into it.

i personally would lighten a flywheel, especially as i wouldnt know how much kg to take off. the more you take off the less solid it becomes and more prone to stress fractures

i've seen cracked flywheels before and not something i would want to experience on any car.....a flywheel breaking up at 6000 or what ever RPM is not my idea of fun

Matt

 

do you want to get your cock any further up Christian's ass?

 

 

no im fine, such a fine example of pfs loverly audience

ive seen how the pf regulars kill the jews

ive been college
work in the trade
and support ppl with knowledge
i even work at ford

not not like the ppl who own a haynes manual and think they can fix everything

 

i also like your double post
is this a pf school boy error so ppl think your a valued member of their fantacy land pf because you have a high post count

 

A few flywheel quotes:

"I had one in my old Cav V6. the most noticable thing I found was lower fuel economy on long runs. The thristy V6 round town was capable of high 35-40mpg on a run. This dropped to 30-35mpg after having the flywheel lightened as the stored energy in the mass of the wheel wasnt turning the engine "for free". Round town I didnt notice any improvement except in the drivabilty, much easier to get going and a much nicer driver."

https://passionford.com/forum/showthread.php?p=3392763

 

I've not seen any evidence in this thread, any of the quotes or that other PF link that a lightened flywheel affects the amount of Torque an engine produces, as per your earlier reply.

It's a bit arse-about-face in my logical eyes. Torque is produced BEFORE the flywheel and if anything, the flywheel being lighter will help the engine be more efficient.

Agreed that you have to know what you are doing and going too light will have nasty side-effects. Also, whether or not you notice the difference may be questionable too, but that's no different to many other mods (like knife-edging cranks etc).

My 1600CVH makes 300lb/ft with the lightened Flywheel on it. I've had that fitted since around 2004, so any results the car has achieved have been with it. How many other 1600 CVH Turbo's have done 300lb/ft?

 

Sounds to me like Cristian was the only one that actually paid any attention in GCSE physics.

 

im sure LHD220Turbo will be along to point out how we all love christian so, with more agreeable posts happening

 

the hypocrite himself! - so rather than offer your own written opinion & expertise, you choose to belittle B16CVH by saying:

Is that not "such a fine example of pfs loverly audience" then?

 

To put things very simply......

Torque is a measurement of Force applied in rotation, what determines this force (and is it's point of origin) in our engines is the size of the explosion in the chambers not the weight of the fly.
Changing the weight of the flywheel just adds or subtracts load/drag applied to that Force.

So....
Lighter Fly means less load and allows it to accelerate faster, and in theory more power and torque will be available at the wheels.
Heavier Fly means more load and will slow down acceleration, and in theory restrict power and torque available at the wheels.

But... lightening the Fly will loose you momentum, and so things like hill climbs, standing starts etc.. will require more RPM's than before.

This is worth a read http://www.torquecars.com/tuning/fly...lightening.php

Knife edging your crank has a similair effect but also reduces some of the counter weights vibration dampening, and so really the entire engine should be rebalanced after doing this.

 

too many people on here do exactly that

 

I thank you!!

 

(However, Christian does have an 'h'!!) AFPMSL.

 

doug didnt get his GCSE in spelling

 

brillant