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#1
13-01-2010
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LiPo's - Tight under Pulley
Hello,
Tried installing my Bionic 5000mAh LiPo's in to a Cat SX and they are just about in contact with the pulley and the belt is going to drag all over them. Has anyone come up with a mod to allow for slightly larger LiPo's? Thought about shimming the front and rear bulkheads to raise the pulley / lower the chassis. Shims would be about 1.5mm and fit between the bulkheads and the chassis. I have some concerns over doing this particularly for the front bulkhead as there seems to be a need for part of the bulkhead to step around the front edge of the chassis and there are also 2 rectangular cut-outs which also locate / align the bulkhead. Shimming will reduce this location and also reduce the groung clearance by the shim thickness. The other thing i have noted is that the Bionic LiPo will be in contact with the front belt and this looks like it will need more than 1.5mm shim to clear. If i sit the battery further out from the centreline to clear the belt it won't fit in the under tray and it will still shift inboard if i get a shunt on the track. Any other ideas would be welcome. Lastly, i've just got back into RC after a lengthy 'baby break' and i'm stunned by how good LiPo's are but utterly frustrated by the fact that no 2 manufacturers LiPo's are the same size. Standardisation should be called for by BRCA and others.
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EddZilla 
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#2
13-01-2010
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Hi, does the Lipo have 'humps' underneath or is it flat?
Matt
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#3
13-01-2010
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My new Nosram 5300 40Cs are tight on the stiff chassis - I think the speed passions are a better fit.
Think the Bionic ones are flat as I looked at them recently. Have you fitted the Nortech retainer kit?
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#4
13-01-2010
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No retainer fitted at this point.
The problem is that the battery fouls the pulley and the chassis would need some modification to accepy the Bionic batts. For info the Bionic 5000mAh 40C batteries are 25mm high and are a flat bottomed brick.
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EddZilla
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#5
13-01-2010
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they are close but at the size u mention they shouldnt touch
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Mattys the driver,my names carl
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#6
15-01-2010
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I can assure you that they are in contact with the pulley.
I took the 25mm dimension from the website so it could well be 25.something mm. Either way i cant run the car with this condition. More worrying is the possible contact with the front belt.
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EddZilla
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#7
15-01-2010
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Is it a new Cat SX or second hand?
My Nosram's are super tight in the stiff chassis to the point were they have had their sticker partly taken off by the belt area.
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#9
15-01-2010
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I have tried the Bionic 5000 mah in my CAT (Phil Booth) when I was at LHS, Its too big I think, dont know how you can make it fit? it rubs front pulley, the only way I can think it will fit is to raise the front bulk head but this will screw up the handling.
Not sure what you can do really? Sell it and buy LRP/Trakpower/Speed Passion?
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Schumacher
Linear Mode
