Gearbox Ratio Help

[RenoirLV]

I bought my box some three years ago. It looked like the only 4:1 I could find online then. Perhaps I didn’t in know the right places.


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[PershingLover]

The Heng Long Ultimate also have bushings right?

My only problem is that they are medium and low, so they might not leave enough space for the smoke unit.

[jarndice]

Smokers come in different shapes and sizes, And the aftermarket versions are almost certainly going to be more reliable than Heng Long/Taigens original space wasting oblong shaped smoker.
And a really easy way to save space in a Tank hull is to line the floor and the inside walls with Velcro and that way you can butt everything much closer together without relying on screws and glue.
Don't forget to use Cable Ties to gather the internal wiring together, That alone will save a lot of space.

[RenoirLV]

The Heng Long Ultimate also have bushings right?
.

Wrong.



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[PershingLover]

Hrmm... Taigen and HL seem to be out. Any ideas for an upgrade gearbox with steel and higher speeds/torque?

[Jimster]

Mine haven’t arrived yet but check out the DKLM PDSGB units. They come in either low or high speed versions. There’s some YouTube videos showing them in use. Kind of pricey though.

[RenoirLV]

DKLM propulsional stands out in the bunch. I’m still in two minds if I want to install it. It’s longer than any regular gearboxes. Takes up more space in the hull.


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[Wildboar44]

I know this post is primarily asking the difference between 3:1 and 4:1 gearbox ratio's. One thing mentioned here is the noise made by steel geared boxes, I came across a tip on this forum a few years back by member Jonger who posted a fix to some of the noise by "shimming" the slack out of the shafts by using brass washers. I used this on my 2013 HL metal gearboxes and it did reduce the noise quite a bit. Also covering them internally also reduced the noise.

This is the link :
viewtopic.php?f=38&t=9841&hilit=shim+hl+gearbox

It is worth doing for the "bushed" gearboxes I used a small diamond file to clean up every gear edge, just enough to take off the sharp edge. Then ran the gearboxes attached to a drill and ran for 30 mins each way with automotive valve grinding paste. Striped them down, washed all signs off paste and re assembled finally using sticky motocross chain oil to lube the gears. It does remove a lot of that mechanical graunch that you hear above the speaker sound.

[PershingLover]

As I mentioned at the time I bought and fitted my new Heng Long Gearboxes from http://www.forgebeartanks.com they were the easiest to fit onto a Gearbox mounting plate that I had ever used
Not too expensive and all bearings.

Now, which gearboxes are these? Because Renoir posted a pic of the HL Ultimate with no bearings.

[jarndice]

It is long overdue time to tell the truth about 1/16 gearboxes advertised as "Fitted with bearings",
At the Heng Long/Taigen level the best of their gearboxes do NOT run in bearings they run in Bushes,
If you want true bearing fitted gearboxes you have to pay through the nose for them and buy ETO/DKLM, Having over the years seen what kind of damage Water, Grit and neglect causes to bearings in motor vehicles I am not so sure bearings in 1/16 scale gearboxes which will get in most cases zero maintenance would turn out to be much of an advantage in the long term over gearboxes whose shafts run in bushes,
Bushes by there very nature have no moving parts unlike bearings, they just keep going until they wear out, Anyone who owns a motorcycle knows that the Headstock bearings on a new bike are very sparingly greased and if the owner or the garage mechanic do not regrease the headstock bearings trouble will ensue,
The rider will become aware of the steering getting heavier the owner of a 1/16 scale tank will get very little warning prior to gearbox bearing failure.
If the bushes in your Tanks gearboxes are on the way out the gearbox gets noisier early enough to save you from financial disaster
By the way because I say bushes in gearboxes are zero maintenance does not mean the gearboxes are zero maintenance they need to be regularly inspected, cleaned and lubricated