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Learning how to build Lotus Seven replicas...together!
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PostPosted: November 16, 2014, 4:38 pm 
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Joined: July 27, 2013, 3:16 pm
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Location: Cedar City UT
aww :ack: ... discovered that the "torsen" RX8 diff is pure marketing BS :roll:

its NOT a genuine helical/worm gear Torsen ... its simply a so called "torque sensing" posi traction unit (regular spider gears with cone clutch action)
and according to RX8 owners it is fairly "mild" acting (what is kinda useless for my application)

interesting is that Wikipedia actually lists the RX8 under factory Torsen equipped cars in its Torsen article :?


so there goes that plan :roll:


surfing rear differential carriers for weeks now ...
cant seem to find any good solution :BH:
somehow everything turns into a too heavy & notsolocost solution

Image


... maybe its time to look into plan B ;
mid engine/chain driven LSD :shock:

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PostPosted: November 19, 2014, 12:32 am 
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was thinkering with a chain drive solution


i see a couple problems with a chain driven midi like in this pic:

Image

- short chain is usually overheating and short lived
- (with a LSD) there is no room for a "cush drive" dampener
- to get the correct gear ratio i would also need a similar huge rear sprocket :shock:
(and/or a smaller front one ... something that i definitely dont want to do)

on top of that no matter how i arrange things i just dont like the weight distribution, length and the seating position of a mid engine :ack:

so how about a front engine chain drive :idea:

rough sketch, but something like this maybe ?!?:

Image
click here for high res pic: http://www.supermotors.net/getfile/1041990/original/spectre19.jpg

"packaging" of the engine in this orientation would be just fantastic (air box would be at the highest point of the hood/cowl)
radiator hoses, shifter, etc would be very simple ... i could even reuse the stock exhaust header :P

a stock GSXR 1000 has 17f/42r sprockets ...
with two chains i could (for example) spread the reduction over a 18f/46r front and a 36f/48r rear
(the 18 tooth engine sprocket would be easier on the chain)

stock (maybe Hayabusa sourced ?!?) cush-drive could go between the two chains at the idler block (in front/between the seats)

i think the strength of a high quality o-ring 530 HD series chain should not be an issue ?!?


what do you guys think about that :?:

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PostPosted: November 19, 2014, 2:14 am 
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Joined: April 12, 2010, 5:40 pm
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Location: san francisco bay area
A Giubo joint would take care of your cush drive requirement, that could connect 2 short shafts easily.
One of the members, whose name escapes me at the moment, did something similiar and raced it quite competitively on an ice course.
I'll see if I can remember enough to run thru the search engine.

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PostPosted: November 19, 2014, 2:23 am 
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Here it is, http://www.locostusa.com/forums/viewtopic.php?f=36&t=13049&hilit=snow+course.
OK, my memory was a little off, he built a 4x4 with the engine in the middle driving a forward and a rearward chain.

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PostPosted: November 19, 2014, 12:13 pm 
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Joined: July 27, 2013, 3:16 pm
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Jack
thanks for the link :cheers:

yeah, if this project would be a strict track (or dune) weapon i would definitely go the Palatov dp4 inspired direction ...

Image

... of a true midship engine AWD single seater 8)

but for a "toy" i prefer RWD (not ideal traction wise , but high in the fun factor :mrgreen: )


or if money would be no big factor,
i would join a inverted (high pinion, but standard rotation) Quick change with a cush-drive joint direct to the (turned lengthwise) engine

talking about QC;
i actually like the fact that with two sets of chains i have the ability to fine tune the final ratio in a similar fashion (but not as fast as with a QC)
530 series sprocket selection is huge ... and the chains are available in XL length (for drag bikes with extended swing arm)

i think i also have a solution for the cush-drive already;
it seems that Suzuki flipped the Hayabusa cush-drive around sometimes between model years
there are male and female sprocket hubs available
the 99-07 hub had the "bell & paddle" part in the sprocket hub;
Image
but the 08-14 has them at the rim;
Image

so in theory i should be able to join the two parts (with the rubber C-cushions in place) and i would have sprockets on each side :o

the parts are fairly cheap so i may order some used ones off e-bay and try it out

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