316ss doughnuts with press in bushes

[jazig.k]

like other cars, which sometimes get a mention on this forum in other threads about a better way [doughnuts].

im a machinest by trade so it wouldnt be hard to make them up. just a 316SS [or other non rusting material] with the center bored out, 6holes to press bushes into [suitable for the shafts], and 6more smaller holes drilled on a larger PCD to reduce the wieght.

im thinking stainless for strength of the walls where the bush is closest to OD. i dont want to increase the OD too much more than i have to. this is why im not really looking at al'.

i know i have to allow for the flex along the shafts too. how much though? the more flex means the bigger the bushes need to be... which increases OD, and if they get too big, i cant do it at all.
what is the biggest OD i can fit underthere anyway?

ballance will be easy... all diameters will be true to eachother. when set up on the mill for drilling, it will be set up to the center bore within 0.001" . its just the bushes wieght after that.


id rather know what wont work before i try, so flame away!

[jazig.k]

maybe this is better suited to the transmision section.
mods, feel free to move the thread if you think so.

[jazig.k]

no negitive thoughts on the idea? should i mention this wouldnt be a genuine alfa part, there fore against the laws that some people live by?

[ossodiseppia]

I am no eng-uh-neer, but I'll offer my thoughts. It sounds like a neat idea, but... A solid donut will introduce more drive line vibration which could damage the transmission and drive shaft. And, it might put a little more wear and tear on the clutch as the rubber donut may act a bit as a torque converter.

On the plus side, I'll bet you can have some really great jack rabbit starts.

[jazig.k]

thats why i was thinking press in bushes instead of a solid doughnut, well, that and the flex it needs to have.

i idnt think on the original ones having a converter kind of effect...
is there anyone that converted to uni's have any complaints on the vibrations, and wea- and-tear?

[crashmctavish]

316 is far too heavy mate.

[jazig.k]

well feel free to suggest something that doesnt rust and will hold up to a thrashing. when i get back to work, then ill start looking at weights.
wieght is also the reason i want to drill extra holes, to reduce it, but keep the strength up.

[GTV-GR]

That's a good idea, go ahead , get some pictures up here when u finish it

[jburning17]

Quote:

Originally Posted by jazig.k well feel free to suggest something that doesnt rust and will hold up to a thrashing. when i get back to work, then ill start looking at weights. wieght is also the reason i want to drill extra holes, to reduce it, but keep the strength up.

[ossodiseppia]

Quote:

Originally Posted by jburning17 I love the above comment about being an engineer. I am one, but I also know that most great ideas come just from people who are willing to give something a try. Give it a try!

[jburning17]

Quote:

Originally Posted by ossodiseppia Wouldn't a large and thick flat washer be sufficient? The yoke is going to hold one side of the bushing in place.

[jazig.k]

thanks for some positive inputs guys... sometimes hard to get with a new idea...

your right about rubber holding up to high heat and stress, but i want something that will hold up in a burnout comp, thats what i plan to thrash them with... highrevs and dumping the clutch, that and drifting.
this is why i asked about a mini/full spool in another thread. i know ill probably blow a gear box at some point, so i dont want to buy a $1000 box everytime.
alu' would be better than rubber, but would the extra wieght of the 316 really be that bad?
its a small diameter, but with small wieght-reducing holes around the outside it shouldnt be too bad? and with a lightened flywheel to counter the extra wieght...


the circlip idea is what i didnt think about. dont want the disc to shift on the bushes under load!


i think im really gonna need to sketch this out, but press in bushes up to a shoulder on the side that the shaft bolts goes through. and a small washer on the other end of the bush center sleeve.
the washer wont rub the disk, other wise the buses are too small in diameter, or theres some serious flex happening.

the shoulders. 3 on oneside and 3 on the other to match the shafts. so the shoulders, working against eachother, should hold the disc in place when assembled.
when the nut it tightened, it pulls the bush against the tailshaft, and against the shoulder.

does that make sense? wish i had CAD on here so i could draw it up for you. might try and install it tomorrow [if this comp can handel it]. will make it alot easier.

thanks again for the positive inputs

[roy]

We have (&had) a few Alfas & Alfa powered cars & race cars with a u-joint at the rear of the trans . First adapter was made up by Pappy Hough in Paterson NJ . Others I made out of an aluminum ring that bolted to the yoke on the rear of the trans & had a recess cut in to center & bolt a driveshaft flange to . Works fine . This was after a dounut with sheild broke & hit me in the leg at Pocono (1973?).Roy

[jburning17]

Here it is: post #89

http://www.alfabb.com/bb/forums/moto...-breaks-6.html

Check out the pictures in this thread. It should make you want to work one of these up right away. Make one for me, too!

Jon

[jazig.k]

that bottom picture is exactly what im talking about here.
the outer wieght reducing holes, and the press in bushes [except im thinking of bushes that have an outer metal sleeve so it sits against a shoulder].

edit : removed a question that i found a answer to.

edit :
it says that scuderia [spelling] made one, but only for the front doughnut. why? would the small size of the bushes not account for the flexing? that would fix the problem with the front, but still leave the risk of failure with the center and rear. is the front the most likly to fail under high stresses?