Saturday, May 05, 2012 at 17:59
G'day Rodge
I am amused at the comment "will this small difference diameter be a problem".
The difference is 27mm bigger at one end and that erquates to 3.5 approx % difference.
In my opinion this is a huge amount of difference.
For every turn of the big ones, the small ones are trying to do a turn + 85mm of tread.
In just over 28 turns of the small wheels, the rears are trying to over take the front ones with one full turn. So you are asking the front to rears to accept a slip rate of 2.5 metres approx in 70 metres or in other words 35 metres per kilometre. An extremely high slip rate in anyone language.
In half a wheel turn you will have transmission wind up.
Normal windup occurs when the front axle is turning outside of the rear axle and is at a very slow rate compared with this and even it becomes a problem and sometimes causes damage.
Because of the restrictive nature of this you will most likely use a massive amount of fuel as the rear tyres make the front ones into slowly rotating bull dozers in sand.
This is a case where a little, not very obvious problem, is really quite different.
You don't want to believe peoples quick mental assessment of this as it can be vastly different to what you think or realize it is.
If you drive like this on concrete you would be able to see the rubber trail it leaves as it just erases the rubber off the tyres both front and back.
A wheely serious and dangerous situation. I doubt if the transmission would last long.
Pi = 3.142 Circumfenerce = 3.142 x 777mm front or 804mm rear
Ross M
AnswerID:
485060