lightweight flywheel
12-29-2007, 07:54 AM
#2
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It tends to on engines with big pistons/torque pulses and lots of overlap, but the renesis has neither...
Careful when buying them too as most people will only state a weight, which isn't the important bit - you want the moment of inertia.
Careful when buying them too as most people will only state a weight, which isn't the important bit - you want the moment of inertia.
Last edited by PhillipM; 12-29-2007 at 08:29 AM.
12-29-2007, 09:05 AM
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Well that's nice, what's wrong with my caution exactly?
My flywheel and clutch setup weighs just 4lb less than standard, but it'll still spin up faster than any off-the-shelf replacement you have no matter how light they are, because the moment of inertia is far lower.
My flywheel and clutch setup weighs just 4lb less than standard, but it'll still spin up faster than any off-the-shelf replacement you have no matter how light they are, because the moment of inertia is far lower.
12-29-2007, 09:13 AM
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Moment of inertia is mathematical brilliance now is it?
Should no-one offer any advice any more then as they are obviously 'showing off'?
You can quite happily buy the component, your slight problem being it won't fit your gearbox, so what relevance does that have?
It's not difficult to ask for the moi from the manufacturers before buying.
And what exactly is wrong with the Lasse thread, someone said that his tubular header would make no difference and a few of us explained why it still can and the physics behind it, is that a crime now?
Should no-one offer any advice any more then as they are obviously 'showing off'?
You can quite happily buy the component, your slight problem being it won't fit your gearbox, so what relevance does that have?
It's not difficult to ask for the moi from the manufacturers before buying.
And what exactly is wrong with the Lasse thread, someone said that his tubular header would make no difference and a few of us explained why it still can and the physics behind it, is that a crime now?
Last edited by PhillipM; 12-29-2007 at 09:16 AM.
12-29-2007, 09:21 AM
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As for the second bit, it's called an example, they're handy things.
12-29-2007, 09:23 AM
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And that's fine, you know what's on the market and what works, so suggested them, which is probably more use to him.
I don't, as I have no interest in what's available, but I can offer advice on comparing them which most people miss out, and did so, which can still help him.
I don't, as I have no interest in what's available, but I can offer advice on comparing them which most people miss out, and did so, which can still help him.
12-29-2007, 09:40 AM
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Exactly that, but some of alloy flywheels which are heavier can have a lower MOI as the weight is in the centre to take the torque from the mating face and the outer ring section is very, very light.
Mine weighs 4lb less than the standard setup (it's a lot thicker, hence the weight), so probably similar to what you'd lose from a lightweight flywheel.
But it'll still have far more difference on the engine.
See, now it's starting to get boring
Mine weighs 4lb less than the standard setup (it's a lot thicker, hence the weight), so probably similar to what you'd lose from a lightweight flywheel.
But it'll still have far more difference on the engine.
See, now it's starting to get boring
12-29-2007, 09:52 AM
#11
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Nice this is the setup I want to go to but I am waiting to have to change my clutch to do it.
Can I now have all the kinetic and potential properties for this setup.
Also how are they going to effect my inhertia and specially my Flux capacitor?
LMFAO!!!
mysql did you put these on yet or are you still working on the tranny?
Did you do the work your self to put the fly wheel on or how much did it cost if you don'tmind me asking.
Cause if it's not to expensive I might not wait for the clutch to go what do you think?
Ray it's not X-Mas yet I didn't even get Coal.
Can I now have all the kinetic and potential properties for this setup.
Also how are they going to effect my inhertia and specially my Flux capacitor?
LMFAO!!!
mysql did you put these on yet or are you still working on the tranny?
Did you do the work your self to put the fly wheel on or how much did it cost if you don'tmind me asking.
Cause if it's not to expensive I might not wait for the clutch to go what do you think?
Ray it's not X-Mas yet I didn't even get Coal.
12-29-2007, 10:01 AM
#12
mysql did you put these on yet or are you still working on the tranny?
Did you do the work your self to put the fly wheel on or how much did it cost if you don'tmind me asking.
Did you do the work your self to put the fly wheel on or how much did it cost if you don'tmind me asking.
Cause if it's not to expensive I might not wait for the clutch to go what do you think?
12-29-2007, 10:55 AM
#15
I have the Fidanza flywheel, and the reasons I choose it were three fold; 1) My local parts guy had it in stock so it was ready to go and he cut me a deal, 2) Lightest flywheel out there for the 8, 3) Has a replaceable friction surface disc on the surface of the flywheel, so when you need to replace your clutch, you just replace this disc instead of having to get the flywheel resurfaced or even replace the whole thing, like you have to do with the ACT...
12-29-2007, 10:59 AM
#17
Given how cheap a flywheel is and how rarely a clutch is replaced, I wouldnt base my decision much on those points.
Fidnza fly is lighter but lighter doesnt mean less inertia, which is what actually counts. Do we have specs to compare?
Fidnza fly is lighter but lighter doesnt mean less inertia, which is what actually counts. Do we have specs to compare?
12-30-2007, 07:51 AM
#21
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Thanks for the info guys. 2 more things:
a) Will the lightweight flywheel result in more fuel consumption?
b) Do you usually need to replace something else with this to work more efficiently? i.e clutch, or you just mention clutch in terms of labour costs.
a) Will the lightweight flywheel result in more fuel consumption?
b) Do you usually need to replace something else with this to work more efficiently? i.e clutch, or you just mention clutch in terms of labour costs.
12-30-2007, 07:55 AM
#22
the clutch is a wear item. it will eventually need to be replaced. Since they have to drop the transmission to get the flywheel in, usually you would also replace the clutch at the same time. Otherwise when you later do the clutch, you'll end up paying for labor twice.
12-30-2007, 01:07 PM
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I appreciate your posts but ACT doesn't make this claim. Trust me, I would know since I designed the part. I just don't want people to get the wrong information. We have MOI for our flywheel (thanks to Solidworks design software) but we don't have the stock flwheel (or counterweight for that matter) modeled so there is no way to calculate the difference at this point in time.
12-30-2007, 01:37 PM
#25
I appreciate your posts but ACT doesn't make this claim. Trust me, I would know since I designed the part. I just don't want people to get the wrong information. We have MOI for our flywheel (thanks to Solidworks design software) but we don't have the stock flwheel (or counterweight for that matter) modeled so there is no way to calculate the difference at this point in time.
I'm reciting the 80% claim from what I've read on sales sites, here's one: http://www.rx7store.net/ACT_Flywheel_p/proliterx8.htm