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Post by darrenoakley on Nov 1, 2009 9:59:03 GMT
Hi guys. Was just looking on rc tech forum and noticed a post about diff
tightness. Is there a way of checking how tight it should be ie should you feel tension or should it move freely. As a small adjustment changes it so much.
Cheers darren
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Post by jamietraylor on Nov 1, 2009 11:23:11 GMT
Hi darren to check the tightness of the diff you would put it in the car, hold one wheel and the spur gear and turn the other wheel. I tighten my diff so you can only just turn the wheel.
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Post by darrenoakley on Nov 1, 2009 12:12:30 GMT
Cheers jamie i will check that tonight.The whole diff thing is a bit confusing still.
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Post by Reuben on Nov 1, 2009 14:00:21 GMT
Diffs are very much a feel thing. As Jamie said it should be tight enough so you cant turn a wheel whilst holding the other and spur static.
but then it depends on how much you try to turn the wheel. eg My diff, it only slightly slips if you turn the wheel really hard (almost forcing it), but under resonable pressure it wont slip.
Also running a diff in after a re-build is key, as what may be tight after a re-build may be to loose or to tight after the first run, depending on how much grease has been displaced.
Best thing to do is to get someone to show you at the track, feel their diffs to get a good idea of tightness. If im arround when your there, you can take a look at mine (its a Mi4 diff, but the tightness principle should still be the same?? )
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Post by jamietraylor on Nov 1, 2009 19:18:28 GMT
Also check out Pro Tips with Jilles Groskamp on you tube!
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Post by darrenoakley on Nov 1, 2009 21:59:16 GMT
Just had the diff out and rebuilt it. Cant believe how much easier the thrust balls are to put in if you know how. It was really loose before so glad i checked before finishing building. Now it is tight enough to give me a spool tooth print on the hand when trying to turn it. Guess it will free up a bit once it is running as its a brand new.
Thanks for the tips guys
Darren
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Post by lesbaldry on Nov 2, 2009 7:50:08 GMT
Hi Darren.....Geting a silky smooth slip free diff can be a bit of an art form,various greases(makes) and how the plates are prepared all come into play,Its best if one of us show you....a smooth diff is absolutely vital to the cars performance.Luckily enough the Photon diff is one of the best IMHO,the clever pully tapered ball holes and the side plates allow for less maint compared to some others. Tip if you have a tight spot when turning the wheels opposite each other across the axel its normally a plate problem,Diff plates (the large rings) are pressed out during manufacture and can be slightly missformed ie the surfaces are not flat.The only way to cure this is to flatten the plates surface by working them on a oil stone or some 400/600 wet and dry paper to remove the high spots....easily shown  |
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Post by darrenoakley on Nov 2, 2009 8:36:23 GMT
Cheers Les, i will prob bring the car on wed night and let you have a feel to see what you think. it was good practice to rebuild the diff though. After the chat last week with you guys trackside the tips for the thrust ball and thrust grease to hold them in really made it easier.
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Post by lesbaldry on Nov 2, 2009 9:43:01 GMT
Cheers Les, i will prob bring the car on wed night and let you have a feel to see what you think. it was good practice to rebuild the diff though. After the chat last week with you guys trackside the tips for the thrust ball and thrust grease to hold them in really made it easier. No Prob one of us will give it the once over for you. It will pay you upgrade the main diff balls for ceramics next time the diff needs a rebuild,they are somewhat smoother and last far longer than the cheap kit steel balls....most of us do! |
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Post by yellowshark on Nov 2, 2009 12:53:58 GMT
The only way to cure this is to flatten the plates surface by working them on a oil stone Ooh, when Dad went off to visit the Pearly gates he left that behind; being a carpenter I think he used to sharpen his chisels on it. Always wondered what to do with it, now I know ;D |
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Post by lesbaldry on Nov 2, 2009 13:41:52 GMT
The only way to cure this is to flatten the plates surface by working them on a oil stone Ooh, when Dad went off to visit the Pearly gates he left that behind; being a carpenter I think he used to sharpen his chisels on it. Always wondered what to do with it, now I know ;D Ha ha Pete......A few seconds on a stone or wet n dry paper will soon show any deformity/high spots,The Xray plates I always found fairly true but to be honest I have had some rather wonky HPI/TOP ones that need plenty of working..but they are only £1.99 a pair |
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