hpi gears?

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Jackson gt2

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hey guys had a ton of fun this weeked running my MT with the new bodie i got


i got one of those newbright bodies, hey turned my cat in to a street truck


lowered the shock towers, so the truck looks more like a stadium truck!


i'll have some pics some time this week and am planning on recording it sometime next weekend!


well engine sound a lil boggy, still ran up and down the street pretty quick, no changes of any kind! just hpi street's and the escalade bodie!


anything else stock


so i came up watched some bajas flying around parking lots on youtube


and the idea came!


but before i do anything crazy, i got to ask you guys


had any of you tryed to modfied the hpi gears or anyother to fit the cat?


thanks guys!
 
The problem with gears is your center to center distance is a fixed because of the linear distance between the engine and main layshaft. Getting another vehicles gear's to fit that distance is a nightmare. Because we run a 1:1 ratio, or something close to that depending on what you like, running two gears like a FG or HPI does would require gears like a 42/45 (guessing) or vice versa to be able to mesh right. Problem with that scenario is that the "spur" gear is limited in it's maximum size because of the distance of the layshaft from the chassis.


There are good charts on this site that can help you out if you want to pursue it. Take my advice and don't. I've been there done that. Anyways, make sure to switch the Module from 1 to 1.5 at the top of the page:


http://www.qtcgears.com/RFQ/default.asp?Page=../KHK/newgears/KHK046.html


Module is the metric equivelent of tooth "pitch". I wouldn't bother with a Mod 1 because the teeth would be too small. Mod 1.5 is what you see on cars like ours. To calculate how far two gears need to be spaced you would sum up both of their pitch diameters (PD) and divide by 2:


(PD + PD)


----------


2


That does NOT take into account tolerances for proper gearmesh/backlash. Play around with different gears untill you get two to fit the distance between the CB and layshaft. Keep in mind that your limited to about 50mm diameter on the layshaft side before the gear gets too big.
 
thanks for the tip, it was kind of a and of end the day idea, you know!


i'll keep on trying!


for now i got the servo/receiver swap to deal with


thanks man, keep the infos and tips coming am still new to this scale!
 
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