New Product: Aluminum Flywheels with and w/o timing gear
07-04-2007, 12:12 PM
#16
Rennlist Member
Originally Posted by Carl Fausett
John - good catch! The Inner Diameter of all the timing gears are the same. Our flywheel will accept either gear. Good catch tho - I will re-list them so the 100 tooth gear and the 60 tooth gear are listed separately.
07-04-2007, 02:34 PM
#17
Rennlist Member
Yes, the inertia difference on a 9" diameter flywheel (close enough) with shaving 6 lbs, effects the power available to drive the car. However, its different in every gear. in 1st gear its like pulling 200lbs out of your car!!
however, in 3rd gear its like dropping 30lbs and 4th dropping 16lbs. all from just dropping 6lbs off the rotating flywheel. (assuming most of the weight is coming from the outer band. if it is even, the effects would be less)
The engine has less inertia to drive which takes energy depending on the acceleration rate.
mk
If there are no ill effects or warping, etc, then it looks like it would be a pretty easy thing to change out.
however, in 3rd gear its like dropping 30lbs and 4th dropping 16lbs. all from just dropping 6lbs off the rotating flywheel. (assuming most of the weight is coming from the outer band. if it is even, the effects would be less)
The engine has less inertia to drive which takes energy depending on the acceleration rate.
mk
If there are no ill effects or warping, etc, then it looks like it would be a pretty easy thing to change out.
Originally Posted by Carl Fausett
The weight difference is about 6 pounds. But, this is not like taking 6 pounds out of the bumper... this is taking 6 pounds out of your rotational mass... this means that engine torque can apply to the tires sooner as it has less moment of polar inertia to overcome.
The idle will be the same, no different.
What IS different is that you will need to be a little better with the clutch from a standing start as the flywheel now stores less inertia. Rev a wee bit higher, let it out a tad smoother. That's all.
As to the "holes" - think of drilled brake rotors. The drilling allows the gas created by the hot friction material to escape so the friction material does not "float" above the disk on gas when hot. Same thing here. In creases the surface pressure per sq inch too.
The idle will be the same, no different.
What IS different is that you will need to be a little better with the clutch from a standing start as the flywheel now stores less inertia. Rev a wee bit higher, let it out a tad smoother. That's all.
As to the "holes" - think of drilled brake rotors. The drilling allows the gas created by the hot friction material to escape so the friction material does not "float" above the disk on gas when hot. Same thing here. In creases the surface pressure per sq inch too.
07-05-2007, 01:17 AM
#21
Developer
Thread Starter
What kind of stuff would I need to do a conversion from a single disk to a dual disk? Carl it would be nice to have a kit for this.
Of course I have the flywheel, friction disks and pressure plates in my clutch kits here: www.928clutch.com but I do not have the other parts you need to convert as I am not a dismantler. But like I said - 928 Intl can set you up with those pieces easy.
07-05-2007, 10:07 AM
#23
Drifting
im guessing they come without the timing gear... one other question - concerning the timing gear, on the standard flywheel in the manual cars these did occasionaly slip if the clutch was abused. what are the different expansion rates of the aluminium to steel ie will the ring slip off when the unit gets hot?
07-05-2007, 10:52 AM
#24
Developer
Thread Starter
Just the opposite. Since alluminum expands at 300% the rate and amount as steel, as the flywheel gets hot, the aluminum expands and holds the steel timing gear tighter and tighter. Also, when we mount the timing gear onto the flywheel for you we use Loctite GREEN for engine sleeves and bushings. It ain't coming off without a torch.
07-05-2007, 10:55 AM
#25
Developer
Thread Starter
Carl can you buy them without the timing gear and fit your own? I have three of those gears as such I dont need a 4th.
im guessing they come without the timing gear... one
07-06-2007, 05:42 AM
#28
Drifting
simply going from the single disk clutch to the twin disk makes a really nice improvement. when i converted my 86 auto to manual and installed the GTS engine i retrofitted the twin disk clutch. the difference in driving that car compared to my 88 SE made me think i would definitely retrofit the twin disk when it came time to do the clutch in the 88. carls light weight flywheel would be a further improvement!
07-06-2007, 05:42 AM
#29
I think this might be Carls best product, I like the do it yourself option, especially as I have 3 timing wheels already.
Well done.
Greg
P.S can you PM me with a price for postage via USPS for both EMS and seamail? Sydney Australia is the address.
Well done.
Greg
P.S can you PM me with a price for postage via USPS for both EMS and seamail? Sydney Australia is the address.
12-14-2008, 04:46 PM
#30
Rennlist Member
Carl,
Just wondering that since the stock flywheel has a centering "lip" that holds the intermediate plate in place, how does your set up center the intermediate plate. Is there not enough play in the bolts and the intermediate plate bolt holes to allow misalignment?
Just wondering that since the stock flywheel has a centering "lip" that holds the intermediate plate in place, how does your set up center the intermediate plate. Is there not enough play in the bolts and the intermediate plate bolt holes to allow misalignment?
Last edited by LT Texan; 12-14-2008 at 08:03 PM.