JoaoCaldeira
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| posted on 16/6/06 at 09:54 PM |
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Drilling diff bolt
Hi all.
I'm using a Digidash 2 Lite; to take speed it's used 2 small magnets (2mm high, 6mm diameter); usually they are glued (Araldite, etc...)
to the propshaft, something similar to
The problem is that in a BEC where the engine goes up to 12.500 rpm, the magnets tend to disappear.
To avois this I was thinking about making a small hole in two of the propshafts to diff bolts just like the ones in the pics. I think that it
won't be much of a problem, resistence wise, but I would like to know your opinion.
Thanks in advance,
Joao
[Edited on 06/6/16 by JoaoCaldeira]
[Edited on 06/6/16 by JoaoCaldeira]
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Peteff
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| posted on 16/6/06 at 10:08 PM |
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The engine may rev up to 12,500rpm but the output shaft doesn't. If your prop was turning at that speed you'd be in orbit, the reduction
gear lowers it so the magnets wil be no more likely to fly off than a car powered by a car engine.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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watsonpj
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| posted on 16/6/06 at 10:10 PM |
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Magnets
The fact its a BEC doesn't make much difference as the propshaft is turning about the same speed as a CEC otherwise your sierra diff would be
giving you a higher top end!
The small amount you have drilled into the bolt shouldn't make much difference so I don't see a problem there but can you get the sensor
close enough to them once fitted?
I did it a slightly different way I drilled into the engine adapter flange (you could do it to the diff flange). The holes were just the right size
to get the magnets in and allowed them to sit flush with the outer diameter. I liberally araldited and put it over the top too. I then got sellotape
and cut long thin stips and araldited that over the top and put araldite over that too. They're still there they are going anywhere.
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indykid
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| posted on 16/6/06 at 10:22 PM |
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or to save fannying about, araldite them onto the surface, then some gaffer tape or insulation tape over the top, wrapped right round the flange.
and robert's your dad's brother. mine are still there after about 2000 miles.
tom
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JB
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| posted on 17/6/06 at 05:56 AM |
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Propshafts and bonding
I used to balance props for a world rally champion (tube was metal matrix composite) and we used to bond them on and then 3M aluminium tape over the
top.
They never came off.
John
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