Bighit 8t mac

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deffx   100 W

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Bighit 8t mac

Post by deffx » Jul 10 2013 4:07am

Bighit 8t mac

Just thought i should post a thread for my bike, as i have been following endless sphere for a while and randomly posting generally useless information

Nothing very creative in my build except maybe the battery box, which took inspiration from "timma" well the cutting and chopping not the exicution

8t mac, 12 fet 4110 infineon, 15s 15Ah zippy lipo.

2007 Specialized big hit 2, chequer plate box cut into frame to house batteries and controller

The box was a favour and a rush job, not much planning i.e we made it up that morning, but my friend is a first class welder and did a great job with the limited tools, materials and work area we had on hand that day.

A year now and the frame is holding fine, 15s was the secret for fun after running 12s for a while, I can keep up with 50cc mopeds/scooters but blow them away on acceleration, freaks them out! Not sure how long the mac will hold up 40+ amp peaks, but i only go flat out 10% of the time

Bike rides great, i previously fitted the kit to a couple of lighter xc bikes, soon realized i needed a DH/freeride bike.

Not much fun pedaling it without power, but it was not much fun to pedal before the motor

Before
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Nearly finished
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Freshly welded
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Stealth Matt Black
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Early days
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Image.
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My ghetto backup bike
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Last edited by deffx on Apr 07 2014 11:42pm, edited 22 times in total.

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hjns   100 kW

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Re: The Blue Beast

Post by hjns » Jul 10 2013 6:08am

Very nice kitten, I think you mentioned it in another thread as well.

I just started with a Big Hit build myself, slightly bigger motor, though.
Henk


All men dream: but not equally. Those who dream by night in the dusty recesses of their minds wake in the day to find that it was vanity: but the dreamers of the day are dangerous men, for they may act their dreams with open eyes, to make it possible. T.E. Lawrence

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deffx   100 W

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Re: The Blue Beast

Post by deffx » Jul 10 2013 4:18pm

hjns wrote:Very nice kitten, I think you mentioned it in another thread as well.

I just started with a Big Hit build myself, slightly bigger motor, though.
Thx and yes i did mention it before, just thought it would be nice to share and document it in its own thread

I think I should put a bigger DD motor on too, before I kill this Mac

Looking forward to see your build as i really like these specialized BigHits

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dawrench   1 W

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Re: The Blue Beast

Post by dawrench » Aug 30 2013 12:39am

A beautiful build. What thickness of plate in the battery box? Did you have it heat treated?
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deffx   100 W

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Re: The Blue Beast

Post by deffx » Aug 30 2013 2:03am

G'Day Dawrench

LOL "beautiful" is not how id describe it, practical and great fun is

Its 3mm plate, no heat treatment, No problems so far, I don't really jump higher than a foot if that, but have hammered it somewhat offroading. Its pretty heavy and planted

I was going to get it powder coated which involves going in an oven for a while, kind off a semi heat treatment. But it is going under the knife again, i would like to do a more refined/intergrated tank job.

Carrying a decent battery was my main requirement, it has 30Ah @ 12s or 20Ah @ 15s, thats roughly 1300-1500 Wh

Recently updated forks, stem and wider bars,
Image

Lussy   100 mW

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Re: The Blue Beast

Post by Lussy » Sep 24 2013 7:49am

Deffx,
I have just bought the same bike and looking to make similar mods. Will either go with the 'box' option like you have or will replace the whole bottom tune similar to timmas builds. Did you cut out the existing bottom tube or is it hidden inside the box?

Cheers
Matt

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deffx   100 W

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Re: The Blue Beast

Post by deffx » Sep 25 2013 8:14am

Hi lussy.

Bottom tube removed, kept half the top one to help keep the angles/length and I think its given it some strength

Was a real rush job at the time, would love to redo it one day' timma style

Great bike though, rock solid at 60 km/h

One idea is to build a complete new front section and have the option Of switching back the original frame to sell or ride. To late for me now though

Look forward to seeing yours
Last edited by deffx on Dec 06 2013 1:32pm, edited 1 time in total.

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Dec 06 2013 5:03am

small update, new rear shock,a "romic" I had never heard of them

but a google search revealed they were pretty good back in the day

$50 three springs, 400,500 and 600 mint condition, worth a gamble

The big hit i bought had a 750 lb spring, on a fox vanilla r

way to hard for little me 72 kg 150lb,

So i was looking for a new spring for the fox when this turned up local :-) for $50

What a difference, trying not to swear,

Having correct sag, compression and rebound (still need to play around alot)is frocking amazing

Ran one of my usual routes and the bike just ate it up, like floating on air

I have been running low pressures in my tyres to compensate for the hard rear end,

which isnt advisable as you can spin the tyre and tube.

I am gobsmacked how well it rides and inspires confidence,i had a couple off massive saves, it was good before but now :-)

Need to put my Knobblies on and go for a bush ride

Sorry to rave on but am stoked with the shock and the missis just doesnt get it :-)
Last edited by deffx on Dec 06 2013 1:37pm, edited 2 times in total.

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Dec 06 2013 5:43am

just went for another run a bit more hard core, masivly impressed, this is my bad for having the rear spring rate wrong for so long.

i am getting so much grip were it would slide before, mental

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John Bozi   1 MW

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Re: Bighit 8t mac

Post by John Bozi » Dec 23 2013 7:56am

One of these days I'll get started on my triangle. I like your fighter looking bike.

looks like a pain to get batteries in and out...

My greatest concern when going more than 2 bricks is charging and balancing

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Dec 23 2013 9:01am

THe access hole has grown a bit since then

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sneak peak of something im working on

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John Bozi   1 MW

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Re: Bighit 8t mac

Post by John Bozi » Dec 23 2013 4:02pm

Is that a norco?

Your not worried about the strength of the frame? Looks exciting if it holds up. How wide is the frame? enough for 6cm lipo?

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Dec 23 2013 9:23pm

John Bozi wrote:Is that a norco?

Your not worried about the strength of the frame? Looks exciting if it holds up. How wide is the frame? enough for 6cm lipo?
Yes an old Norco shore vps 2002

Worried? Hell yeah! I'll get it rolling without a motor and make up some bolt on side covers. Then test it out

Width is 40mm internal at the moment so 4s packs, 10 Ah at 12s should fit

I was inspired by this build

http://endless-sphere.com/forums/viewto ... =3&t=39746

I think I may probably have to chop it a bit wider, it's early days

Lussy   100 mW

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Re: Bighit 8t mac

Post by Lussy » Dec 29 2013 7:06am

Deffx,
Finally finished my build (nearly). Didn't end up welding to the frame but used epoxy to attach a alloy box.
Bighits are a good donor bike.


http://endless-sphere.com/forums/viewto ... =6&t=56221
cheers Matt
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Bill Nye the science guy   100 W

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Re: Bighit 8t mac

Post by Bill Nye the science guy » Dec 29 2013 8:54pm

My welded frame has taken a good beating without any problems, no heat treating. a machinist told me that a quelch in water will harden the aluminium. the aluminium welded on is alot thicker than the thin light weight tubing of the original frame. I haven"t let my bike do any ghost rides down any hills but I throw it into alot of rocky areas. my opinion is heat treat is a non issue as long as the whole frame doesnt reach a very high temp while welding.

Bikes look awesome. vids always appreciated. :mrgreen:
1997 Norco Bomber down hill frame
motor- 9C 2808
Controller- Ku120@45amp x 70volts + cycle analyst
Battery- 10ah nimh sub-c(53s x2) 55 kms top speed

http://endless-sphere.com/forums/viewto ... =6&t=48541

iovaykind   10 kW

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Re: Bighit 8t mac

Post by iovaykind » Dec 29 2013 11:02pm

That thread with the Norco would be mine :) Good to see it inspired you. After riding the ebike for quite awhile, and taking it off curbs and small jumps.. I have to say that even with the two panels taken out, it didn't feel like there were any issues whatsoever. That being said, I think if I were to do it all over again, I wouldn't. It really was a lot of work to get all the batteries and controller in there. What makes it worse is that once its all done, I didn't have access to the guts. If a cell were to go bad, I would be stuck with really no solution. Hope you can figure out a way to fix the issues I encountered.

Anyway, I long sold that bike and made a good profit off of it :) Happy ebiking and be safe!

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Dec 31 2013 8:20am

Lussy wrote:Deffx,
Finally finished my build (nearly). Didn't end up welding to the frame but used epoxy to attach a alloy box.
Bighits are a good donor bike.


http://endless-sphere.com/forums/viewto ... =6&t=56221
cheers Matt
Thats awsome Matt, at least you can convert it back to a normal bike if needs be

Yes good solid bike for a fast and offroad capable ebike, heavy as fuk though and terrible to peddle unassisted :)

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Dec 31 2013 8:22am

iovaykind wrote:That thread with the Norco would be mine :) Good to see it inspired you. After riding the ebike for quite awhile, and taking it off curbs and small jumps.. I have to say that even with the two panels taken out, it didn't feel like there were any issues whatsoever. That being said, I think if I were to do it all over again, I wouldn't. It really was a lot of work to get all the batteries and controller in there. What makes it worse is that once its all done, I didn't have access to the guts. If a cell were to go bad, I would be stuck with really no solution. Hope you can figure out a way to fix the issues I encountered.

Anyway, I long sold that bike and made a good profit off of it :) Happy ebiking and be safe!
I got the frame cheap, but building it up is going to cost $

It will need some welding work too, as i need to remove the indented panels both sides to accomodate 4s batteries

Wanting to put a bafang bbs02 on her, but a bit short on funds at the moment so its going to take a while to complete

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Dec 31 2013 8:24am

Bill Nye the science guy wrote:My welded frame has taken a good beating without any problems, no heat treating. a machinist told me that a quelch in water will harden the aluminium. the aluminium welded on is alot thicker than the thin light weight tubing of the original frame. I haven"t let my bike do any ghost rides down any hills but I throw it into alot of rocky areas. my opinion is heat treat is a non issue as long as the whole frame doesnt reach a very high temp while welding.

Bikes look awesome. vids always appreciated. :mrgreen:
Yes no problems here either, fingers crossed, touch wood, :-)

Was worried and checked it alot at the beginning, but i have totally abused this thing for almost a year and no problems

the big hit frame is 2mm ali and the box 3mm ali, its even hard to drill a hole in the box.

This is what was cut out
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jesset33   100 W

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Re: Bighit 8t mac

Post by jesset33 » Jan 21 2014 8:09am

very nice big hit and another perth ebiker
how do you like the mac motor

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Jan 21 2014 2:22pm

jesset33 wrote:very nice big hit and another perth ebiker
how do you like the mac motor

Hey Jesse

The big hit is awesome. Heavy and not a "pedal" bike. but it never was even before electrocution

Love the Mac. It's an 8 turn run at 15s on a 12 fet infineon at 45 amp peaks. 60+ km/h. That's right on its limit. Over its limits really. Just been lucky I think, but I rarely run flat out for long unless it's late at night or I'm drunk. In retrospect I probably do run it flat out often but just can't remember :D .

Defiantly worth considering especially now Paul offers the new upgraded stator version. Should be even better.

If you would like to try it pm me

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Samd   1.21 GW

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Re: Bighit 8t mac

Post by Samd » Jan 21 2014 8:02pm

Nice work fella! It would look even better with a coat of paint all over. But who am I to criticise :)

Good job.
http://ballaratebikes.com/

ImageImageImage
"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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deffx   100 W

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Re: Bighit 8t mac

Post by deffx » Jan 21 2014 8:19pm

Samd wrote:Nice work fella! It would look even better with a coat of paint all over. But who am I to criticise :)

Good job.
Thx Sam

I was holding off on powder coating thinking I'd redo the box. But as it's proved to be strong I think I will live with it. Ugly as it is. Pretty close to putting together a second bike so this one can be stripped and get painted. For some reason I'm thinking white even though Black's stealthier

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Samd   1.21 GW

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Re: Bighit 8t mac

Post by Samd » Jan 21 2014 11:56pm

My fabricator doesn't T6 heat treat any more on his buggies for what it is worth, so I haven't on my frames. The harmonic vibration is much nicer in the untreated frame than my T6 6061 aluminium pub bike - that thing rings like a bell when ridden even with a little Q100 hub.

Most high cost bikes I see now aren't T6 heat treated either. I think times have changed for the better.

I used some matt black plastidip spray on my first frame. All the boy racer types seem to do their bonnets now and peel it off when they change their mind for another colour. I like the rubbery feeling of it - mud brushes off. Worth a try IMHO. it does scratch much easier than powdercoat and peel at edges, but its easy to patch so who cares.

Cheers fella.
http://ballaratebikes.com/

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"Knowledge is knowing that a tomato is a fruit. Wisdom is knowing that a 165mm rear shock can't deliver 220mm of rear swingarm travel." - Oprah Winfrey.

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jesset33   100 W

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Re: Bighit 8t mac

Post by jesset33 » Jan 23 2014 4:30am

Got a link to where you got the plastic dip spray ??

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