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#16
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Thanks
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Lee
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SVXx2 92 SVX LS-L Silver 92 SVX LS-L Burgundy (structurally challenged with 2792 miles) 96 SVX LSi Red 92 SVX LS Pearl (Parts) 01 F150 4X4 Red (+6 with other members of the family) FREEDOM IS NOT FREE |
#17
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Instead of the 205-60-14s that I ordered, he sent me four 205-70-14s. I needed tires. I thought, what the heck, it's only 1.61" taller, only 6.8% greater diameter, what could happen??? The next day my 74,000 mile well serviced XT6 lunched the trans.(4EAT w/3.70 ratio) If we did not have a history of smoked transmissions I would not worry about it. But....
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link Last edited by svxfiles; 04-12-2007 at 07:43 AM. |
#18
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Trevor, a larger tire acts much like a smaller gear on a bycicle. It gets harder to turn the smaller the rear gear gets. So, the wheel will get harder to turn as the wheel diameter gets larger... While the difference of an inch is not very significant in diameter, it is still an adverse effect on an already finicky slush box. It is advised not to make it go any quicker
Tom |
#19
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It is good to be involved in a subject with one of your intelligence. I agree with the basis of what you suggest and which aligns with my point regarding “wear factor”. When it comes to the understanding of that involved, the geared bicycle is a very good model. Cycle racing was once my sport and I know all the affects involved first hand. The applicable post and question was :- It's only 0.11" taller than stock. A 225-50-17 would be 1 full inch taller and HARDER on your transmission! We therefore are called upon to interpret “harder” as I tried to do. I applied the words towards including in the main torque stress, rather than just wear, as you have done. With caution I stated,”It can not be truly conceived that larger diameter tyres (within reason that is), will be "harder" on the transmission. In point of fact on a long run, the wear factor will be reduced as a result of a taller effective overall ratio.” Does a cyclist work harder pushing a high gear or a low gear in delivering the power necessary to travel a set distance at an equal time? I used muscle and torque, others revs and stamina. I tended to bend cranks, others wear out chains. Which was “harder” on the transmission? I never did work out which was best for the man. I made the point that “The only aspect for consideration is a possible change in the ratios selected for a particular duty or circumstance” and tried to cover all points of view. What is important is that we have both indicated that any event issue is minor and the driver/rider is the deciding factor, with his foot/feet on the peddles. Others may be bored, but a good discussion. I hope no one is silly enough to imagine controversy. Cheers, Trevor.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#20
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British vehicles are my last ditch attempt to keep the nasty Italian thoughts in my mind at bay. So far its working. |
#21
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Tom |
#22
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One More Step
Now lets take this discussion one more step. I would like the issue of different wheels and tires discussed. Assume for discussion sake that the total diameter of wheel and tire remain the same. Say a stock rim and tire weigh a total of 45 lbs. If aftermarket rims and tires of say 18 inches were put on the car weighing a total of 56 lbs, is there any additional wear OR strain on the transmission? (Of course the 18 inch figure is irrelevant since total diameter is assumed equal.)
Lee
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SVXx2 92 SVX LS-L Silver 92 SVX LS-L Burgundy (structurally challenged with 2792 miles) 96 SVX LSi Red 92 SVX LS Pearl (Parts) 01 F150 4X4 Red (+6 with other members of the family) FREEDOM IS NOT FREE |
#23
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From post #13. The tire and wheel weight also comes into play. The less rotational mass the quicker accelerating and decelerating. If you went from stock wheels and tires that weighed about 40#s, up to the same diameter heavy wheel and tire like some Lexus or Mustang wheels out there that weighed say 48#s, you would feel the differance on your first drive. __________________
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#24
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Understand
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I guess my over all point is that this discussion started with tires that were larger in overall diameter being a significant factor and I have moved it on to different weight wheel/tire mods. Are wheel/tire mods of heavier weight increasing our tranny failure rates? Or is all of this so insignificant in relationship to our tranny wear that is is not worthy of further discussion? Lee
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SVXx2 92 SVX LS-L Silver 92 SVX LS-L Burgundy (structurally challenged with 2792 miles) 96 SVX LSi Red 92 SVX LS Pearl (Parts) 01 F150 4X4 Red (+6 with other members of the family) FREEDOM IS NOT FREE |
#25
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I think that I covered the most pertinent points and even these are trivial. It is my opinion that the the last last query presented above calls for a resounding, YES.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#26
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Gotcha
Read the YES loud and clear.
Lee
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SVXx2 92 SVX LS-L Silver 92 SVX LS-L Burgundy (structurally challenged with 2792 miles) 96 SVX LSi Red 92 SVX LS Pearl (Parts) 01 F150 4X4 Red (+6 with other members of the family) FREEDOM IS NOT FREE |
#27
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[QUOTE=Trevor]Does a cyclist work harder pushing a high gear or a low gear in delivering the power necessary to travel a set distance at an equal time? I used muscle and torque, others revs and stamina. I tended to bend cranks, others wear out chains. Which was “harder” on the transmission? I never did work out which was best for the man.
QUOTE] I know relatively nothing about transmissions, however I can comment on the cyling question - and I'm surprised this question is difficult for you Trevor. The higher "cadence" you are able to maintain, the less energy you will use over a set distance. Novice cyclists don't understand this, they want to get up on the big gears because it doesn't take as many revolutions of the crank - yet it's a much harder "push" and it ends up wearing them out. Meanwhile the more experienced cyclists passes them by, turning at much higher crank rpms but expending much less energy. Perhaps this is analogous to the tranny question
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Jerry 2005 Baja Turbo 2008 Ford Crown Victoria Police Interceptor jnj7707@yahoo.com |
#28
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Well said Jerry.
The differance between getting up to speed and mantaining speed is easy to understand. Take your 3580# SVX, and start pushing it on smooth level ground. Once its moving you can run with it with relative ease, but getting started generates more heat, sweat, and colorful language. The wear in transmissions comes from starting out, not light throttle cruising. Taller tires make it harder to get the car up to speed.
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www.svxfiles.com The first SuperCharged SVX, the first 4.44 gears, the first equal length headers, the first phenolic spacers, the first Class Glass fiberglass hood, the first with 4, 4.44s in his driveway Fiberglass Hood thread My locker 4.44 Swap link |
#29
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[QUOTE=svxxx26]
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In respect of a bicycle, gear ratios, crank length and seat position can be and are adjusted to suit individual Physique. Mechanical aspects must be take into account in any end result. I was above average hight, strong in the legs, but short on lung capacity. A higher than average gear and longer than standard cranks, worked to my advantage. Peddlers did not pass me in a sprint finish. Before you raise the issue, less turns per mile also suited my body better over a distance.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
#30
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However overall, wear is the issue over a distance travelled, and load on the transmission (torque) is the issue at start up.
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Trevor, New Zealand. As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! |
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