Northstar 6 Speed (Page 6/20)
koolgtz NOV 07, 05:06 PM
Is it possible to take two 3800 m/trans flywheel (one with ring gear and mount holes removed) welded together and machined to the thickness of the 3900 flywheel and balanced to the 3800sc spec. Do you think this would work or would it be too heavy?
Will NOV 07, 07:16 PM
I wouldn't want my shoulder in the plane of that monstrosity when it's spinning...
Zac88GT NOV 07, 09:59 PM

quote
Originally posted by koolgtz:
Is it possible to take two 3800 m/trans flywheel (one with ring gear and mount holes removed) welded together and machined to the thickness of the 3900 flywheel and balanced to the 3800sc spec. Do you think this would work or would it be too heavy?



Anything is possible but i don't know if it would work all that well. It would be really heavy but if the machined surfaces were true, it was well ballanced, and you got some good penetration when welding it i dont see why it wouldn't work. Another thing you could try is to use the auto flex plate and a flywheel without the ring gear, then make a stand off to bolt betwen the flywheel and the flexplate and extend the flywheel deeper into the tranny.
Zac88GT NOV 15, 11:42 PM
Just a bump. The flywheel adapter progress is very slow. Master Cam seems to be having issues with dealing with my solid works model aswell so i'm just going to have to plot the profiles in 2d myself and choose all of the tool paths manually. Also i've been pretty busy with school, midterms and such, but I hope to make some progress soon. The northstar lotus project is slow going too but hopefully by tomorrow we'll have the engine mounts finished in it. The hardest part is going to be making the adapter plate to go from the N* to the UN1 lotus trans.

[This message has been edited by Zac88GT (edited 11-15-2007).]

Zac88GT NOV 28, 09:51 PM
I got the flywheel adapter done today. It turned out pretty good, theres only one design change from the model i created and that was to not pocket the bottom around the pressure plate threaded holes. About halfway through the 1/2" endmill got a burr right on the tip so it made a couple un asthetically pleaseing lines but thats no big deal.

Here is the spec aluminum flywheel i'm using as a base.




And here is my sexy adapter plate.





Adapter with friction surface.


And the whole package.



Now i just have to bolt it all together and get the assembly ballanced this weekend and i can install it on the motor.
Zac88GT NOV 29, 10:30 AM
After a little searching i came accross some threads that have the stock 88 V6 flywheel weight at 16.25 lbs. Even with the extra inch of thickness my aluminum flywheel weighs in at 12.5 lbs which i am very pleased with.
Will NOV 29, 01:48 PM
Why not just use a flex plate for the starter gear, a small diameter spacer and then a thinner adapter for the clutch?

You've increased your flywheel weight by 50% with most of that at almost full diameter. That's a very big increase in MOI.
You'll see a significant decrease in your engine's willingness to rev quickly.
Zac88GT NOV 29, 04:22 PM
I could do that, and i thought about it. I feel more confident with this route because you're not sandwitching so many pieces to the crank through the same bolts. The MOI will be very close to if not less than a regular thickness steel flywheel which is what i was after.
Will NOV 29, 11:01 PM
I would be more confident in the sandwiched components, because longer stretchier bolts could be used which would be much harder to overtorque than the factory style bolts. Just make the spacer out of steel so that it won't creep and unload the bolts when it gets hot.
Zac88GT DEC 26, 01:20 AM
Flywheel is ballanced and installed on the engine with clutch and transmission. The depth of the adapter apears to be perfect so far but i will let you know if i have any issues later. The adapter thickness is currently 1.040".

Right now i'm working on building a new set of headers. I have the front header completely done and i will be starting the rear tomorrow. I'll post pics of them when they're done.