Fubar's GT Build


Lorenzo

GT Owner
Mark II Lifetime
Dec 28, 2008
626
U.S.A.
Cup cakes of course. :lol
 

Button

Well-known member
Jul 11, 2009
202
Iowa
Mark whats the cupcake pan for? :lol

Well he did say he feels like it's his birthday!
 

Fubar

Totally ****** Up
Mark II Lifetime
Le Mans 2010 Supporter
Aug 2, 2006
3,979
Dallas, TX
How did you get a ring gear for the starter onto that quad clutch
I haven't forgot about your question. I'm just waiting on some pictures of the adapter we made for this. I'll post up the CAD image today or tomorrow. I will post an actual picture of the adapter when the machine shop gives it to me.
 

Fubar

Totally ****** Up
Mark II Lifetime
Le Mans 2010 Supporter
Aug 2, 2006
3,979
Dallas, TX
Mark whats the cupcake pan for? :lol
You can't have a real party without cupcakes.
 

Fubar

Totally ****** Up
Mark II Lifetime
Le Mans 2010 Supporter
Aug 2, 2006
3,979
Dallas, TX
How did you get a ring gear for the starter onto that quad clutch


The "bottom" picture shows the flywheel in dark grey... the "top" pic show the starter gear ring as a dark grey solid ring (not teeth represented). It is attached to the clutch, that is shown light grey, by an adaptor piece that is shown as gold that bolts to the clutch housing and the starter ring.

Clutch Assembly Top.JPG
Clutch Assembly Bottom.JPG
 

Fubar

Totally ****** Up
Mark II Lifetime
Le Mans 2010 Supporter
Aug 2, 2006
3,979
Dallas, TX
I can have the machine shop cut two of these if your interested.
 

MoTeC Magic

Spectator
Aug 21, 2009
99
Dallas, TX
Mark whats the cupcake pan for? :lol

I use them for keeping parts straight... mainly for fasteners. You can imagine having 4-5 cars in the shop that are extensive builds... all torn down pretty far... that it would be difficult to keep track of everything. They go into the pan and a sharpie labels that hole as to where and what they go to. :)

Works great!

That pan has our crate screws in it :)

Cheers
 

twobjshelbys

GT Owner
Jul 26, 2010
6,185
Las Vegas, NV
I use them for keeping parts straight... mainly for fasteners. You can imagine having 4-5 cars in the shop that are extensive builds... all torn down pretty far... that it would be difficult to keep track of everything. They go into the pan and a sharpie labels that hole as to where and what they go to. :)

Works great!

That pan has our crate screws in it :)

Cheers

Me too. I also use the little take-out salad chip dip containers with a lid if I'm going to be away for a while. Blue tape on the top that corresponds to the other side helps match things up.
 

ultrasportracing

GT Owner
Aug 31, 2011
491
Perth Western Australia
Great idea for the clutch,, how much.??
 

MoTeC Magic

Spectator
Aug 21, 2009
99
Dallas, TX
Great idea for the clutch,, how much.??

Thanks, Not sure yet. As most of you know, the carbon-carbon clutches are not cheap. I've designed and set Mark's car up for a 4 disk. I should know final pricing in a few weeks.

If you look at the rendering, the flywheel is a new piece too. It is much larger in diameter than the new clutch. This is for street drivability. Keeping some weight in the flywheel helps when taking off from a dead stop, like pulling away from stoplights or stop and go traffic.
When racing, it is better it be as light as possible… Guys wanting them for the track, I'll make the flywheel a smaller diameter if desired. Not recommended for the street.

The carbon clutch is already dropping about 15lbs + off the stock clutch. This will have a dramatic effect on engine acceleration due to less rotational inertial. It will be similar to titanium rods and possible more.

Cheers
 

Fubar

Totally ****** Up
Mark II Lifetime
Le Mans 2010 Supporter
Aug 2, 2006
3,979
Dallas, TX
The weight difference was way more than 15lbs! That carbon clutch is ridiculous! It weighs nothing. If you taped the assembly together, you could toss it around with one hand.
 

Kingman

GT Owner
Mark II Lifetime
Aug 11, 2006
4,072
Surf City, USA
:eekDude.....this build is Crazy Sh1t!!!:thumbsup
 

ultrasportracing

GT Owner
Aug 31, 2011
491
Perth Western Australia
I am sure you could sell the adapter for the clutch cover to ring gear in different off sets to suit 2/3/4 plate clutches is it for a 7.1/4" or smaller
 

Indy GT

Yea, I got one...too
Mark IV Lifetime
Jan 14, 2006
2,545
Greenwood, IN
Thanks, Not sure yet. As most of you know, the carbon-carbon clutches are not cheap. I've designed and set Mark's car up for a 4 disk. I should know final pricing in a few weeks.

If you look at the rendering, the flywheel is a new piece too. It is much larger in diameter than the new clutch. This is for street drivability. Keeping some weight in the flywheel helps when taking off from a dead stop, like pulling away from stoplights or stop and go traffic.
When racing, it is better it be as light as possible… Guys wanting them for the track, I'll make the flywheel a smaller diameter if desired. Not recommended for the street.

The carbon clutch is already dropping about 15lbs + off the stock clutch. This will have a dramatic effect on engine acceleration due to less rotational inertial. It will be similar to titanium rods and possible more.

Cheers

MoTeC, very interesting design!

Because we all know Mark will be pulling some high engine speeds (and we are concerned about his well-being), just curious as to your calculated burst speed of the new flywheel, and flywheel/clutch assembly? These can be very ugly failures especially at high speeds. Analytical calculations or have actual verification tests been conducted? Flywheel material?

Sure you have these bases covered. Would be interesting to know for (for me and) our other readers. Thanks!
 

Fubar

Totally ****** Up
Mark II Lifetime
Le Mans 2010 Supporter
Aug 2, 2006
3,979
Dallas, TX
Hmmm, yes Shawn... what is the burst speed of this design?

(frantically googling 'clutch burst speed' wtf is burst speed?)
 

MoTeC Magic

Spectator
Aug 21, 2009
99
Dallas, TX
I am sure you could sell the adapter for the clutch cover to ring gear in different off sets to suit 2/3/4 plate clutches is it for a 7.1/4" or smaller

We could, though, the more offset in the ring gear adaptor the more bending moment. I'd like to keep the adaptor, as much as possible, in tension. For 2 and 3 disk clutches I'd probably just make the flywheel extend further away from the crank flang... Basically like adding a spacer behind the flywheel, between it and the crank but as one piece.

Cheers
 

MoTeC Magic

Spectator
Aug 21, 2009
99
Dallas, TX
MoTeC, very interesting design!

Because we all know Mark will be pulling some high engine speeds (and we are concerned about his well-being), just curious as to your calculated burst speed of the new flywheel, and flywheel/clutch assembly? These can be very ugly failures especially at high speeds. Analytical calculations or have actual verification tests been conducted? Flywheel material?

Sure you have these bases covered. Would be interesting to know for (for me and) our other readers. Thanks!

We’ve run these 7.25” (forgot to confirm the size in post above) carbon-carbon clutches in our pro drag cars for about 7 years… see below. We turn them in excess of 12,000RPM. Mark will be pressed to see 9k, that will be the absolute RPM limit for his build. The clutch is smaller in diameter than the stock or other aftermarket clutches so the forces on it are less too. Another good thing is the weight is less with the carbon clutch than a stock style clutch so it stores less energy. A stock clutch or one like it coming apart would do far more damage due to the significantly increased mass.

Everything is steel with the exception of the clutch basket and pressure plate. They are titanium. The ring gear is stock. Everything will have very high quality ARP fasteners in it. Installed correctly, and operated correctly, there shouldn’t be any issues.

Lots of pics for those that like images.

We made these clutches. Below are images of a few of the vehicles and clutches that we have run in some pretty serious drag applications. The first car depicted below is a RWD Celica with a 152cuin 4 cyl with a billet head that we made, we also converted the motor from chain to belt drive… along with many other custom parts on the car. The engine is makes about 1600hp, the car has run 6.90s.

This clutch is what I wanted to show you. It is built off of a Tilton center. We made the disk, the stands, and the hat. The only thing really different from Mark’s and the first one shown, that is a 4 disk also, is that the fingers are centrifugally driven to apply the pressure plate and engage the clutch. It acts much like a go cart clutch, but comes in at a much higher RPM. The clutch doesn’t lock up till 8000rpm. A street carbon-carbon clutch and a road race clutch have a diaphragm spring and peddle to engage and dis-engage the clutch. The other difference on the race clutch is the stands are adjustable as the clutch wears. Carbon does not wear much and last longer than other clutch materials. It can also take significantly more slipping, though it does generate a lot of heat when slipped excessively. Good thing is, carbon is already burned up :)

This was more to show the experience we have with carbon clutches and show something neat relative to the same subject... I hope you find this interesting

Cheers

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afterwreck3.jpg

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Here is the ProMod 4cyl… 286 cubic inch, currently producing about 3000hp. It’s half of a BBC with a custom billet 4v head and block. Weighs 1900lbs. We made this clutch too. Shown with 6 driven disk and 7 driving disk... tihs was not enough friction material for our power so we added 3 more disk each and are now 9 driven disk 10 driving disk.


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Specracer

GT Owner
Mark IV Lifetime
Nov 28, 2005
7,149
MA
Wow, is about all that comes to mind..... Oh yeah, nice transporter / toter in pic 1.....
 

2112

Blue/white 06'
Mark II Lifetime
Wow, is about all that comes to mind..... Oh yeah, nice transporter / toter in pic 1.....

+1 on both counts
 

ultrasportracing

GT Owner
Aug 31, 2011
491
Perth Western Australia
Very nice clutch. Whats the carbon disc material like to machine..