BIG BLOCK alternative Motor

Discussions related to motors other than hub motors.
This includes R/C motors, botttom bracket, roller and geared drives.
maitilupas   10 W

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Re: BIG BLOCK alternative Motor

Post by maitilupas » Jun 19 2018 12:16pm

wait, try what Adam recommended me this morning , hall sensors capable of higher gauss point , i think he means that can be capable of high vdc , he suggested like 466
i will try and see i think this makes sense

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eee291   10 kW

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Re: BIG BLOCK alternative Motor

Post by eee291 » Jun 19 2018 12:20pm

Sorry, but I'm not replacing the sensors again.

Update: Ran the Motor with the Sunwin Controller with awesome results. The bearing is toast though, so I'll have to replace it but otherwise it runs fine.

Good enough for me

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trazor   10 W

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Re: BIG BLOCK alternative Motor

Post by trazor » Sep 19 2018 7:30pm

I don't know if this is news but looks like something similar to the original BHT is back in stock: https://www.e-bike-diffusion.com/index. ... _num%253D2

Altair   100 W

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Re: BIG BLOCK alternative Motor

Post by Altair » Sep 20 2018 7:14pm

Yep!
But I'm not sure that this small shaft of 10mm will be able to withstand the pull of the chain with 3000W... :(

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skeetab5780   10 MW

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Re: BIG BLOCK alternative Motor

Post by skeetab5780 » Sep 20 2018 8:25pm

Altair wrote:
Sep 20 2018 7:14pm
Yep!
But I'm not sure that this small shaft of 10mm will be able to withstand the pull of the chain with 3000W... :(
Odd the original BHT motor had a 18mm shaft at its fat point, i cut off the smaller portion that held the stock 8t sprocket
Image
Last edited by skeetab5780 on Sep 22 2018 9:28am, edited 2 times in total.

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trazor   10 W

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Re: BIG BLOCK alternative Motor

Post by trazor » Sep 20 2018 8:47pm

Altair wrote:
Sep 20 2018 7:14pm
Yep!
But I'm not sure that this small shaft of 10mm will be able to withstand the pull of the chain with 3000W... :(
I never had this or the original BHT motor in my hands. I really don't know if it can withstand the torque. What I've here and is holding well is a LightningRod's Big Block and the output shaft (not the internal) is 12mm and can withstand a lot of abuse. Never had a problem.

I hope somebody purchase this motor and do a review. I've just purchased a Denzel D4500 and I bet it is probably the best big block alternative at the moment.

Altair   100 W

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Re: BIG BLOCK alternative Motor

Post by Altair » Sep 20 2018 9:21pm

It's not the torque that is going to be a problem, but rather the bending force of a chain pull of many hundreds of pounds, acting about 1 inch from the bearing.
The shaft material will fatigue and eventually will break off right at the bearing.

maitilupas   10 W

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Re: BIG BLOCK alternative Motor

Post by maitilupas » Sep 22 2018 2:45am

i broke 1x 520 sprocket and 3x #219 kart sprockets in these 15mm shafts, shafts still intact!

(front sprockets)

Altair   100 W

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Re: BIG BLOCK alternative Motor

Post by Altair » Sep 22 2018 9:11am

A 15mm shaft is about 3.3 times stronger than a 10mm shaft.
A18mm shaft is 5.7 times stronger than the 10mm one.

Altair   100 W

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Re: BIG BLOCK alternative Motor

Post by Altair » Sep 22 2018 9:13am

This "new" BHT motor looks like it was made to be matched to a gearbox, with this small 10mm shaft.

maitilupas   10 W

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Re: BIG BLOCK alternative Motor

Post by maitilupas » Sep 22 2018 1:34pm

good for me! thanks for sharing will maybe be interesting if it has low weight to a mtb frame or so


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