02GF74
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| posted on 9/11/07 at 01:51 PM |
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offset dowels
prices for an offset dowl kit (xflow) make me want to faint. 
is there an aeternative way of fixing the timing of a cam locost style?
or can you buy the offset dowels individually?
or another way of doing it by making your adjustable gear e.g. own centre plate to bolt the modified gear onto?
[Edited on 9/11/07 by 02GF74]
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MikeRJ
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| posted on 9/11/07 at 02:00 PM |
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Burton Power sell the dowels individualy, but they are £4.50
each!
You could just drill another hole in the middle of the sprocket I suppose, but it would need to be done pretty accurately.
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02GF74
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| posted on 9/11/07 at 02:08 PM |
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4.50 is not so bad then providing I can work out which one/two/three I need, allow for measuing error.
Now I've yet to mess with cams and timing gears on cross flow but what I have seen is the cam gear is located by a dowel and held in place by a
bolt into the cam itelf.
now my thinking, ableit may be worng, is that the timing can be set, the bolt done up and then drill two holes through both and use small bolts to
locate it.
I suspect there are reasons why this is not common practise such as the difficulty of getting the bolt done upwithout hte gear/cam moving, driiling
into what may be hardened steel/cast iron etc.
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MikeRJ
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| posted on 9/11/07 at 09:40 PM |
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Don't know if you noticed the URL in the cams thread, but this place is selling an
offset dowel kit for £20, which is a big saving over Burton.
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lotustwincam
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| posted on 10/11/07 at 04:31 PM |
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Personally I haven't tried the following.
A local and very respected automotive engineer who specialises in building FF race engines told me a couple of years ago that he never uses dowels.
He just uses Loctite between the cam and sprocket faces. Swears that he has never had one slip - ever.
Drew
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Volvorsport
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| posted on 10/11/07 at 04:56 PM |
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its not the dowel that transmits the drive - plus doing it like that , you can get it bang on .
www.dbsmotorsport.co.uk
getting dirty under a bus
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britishtrident
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| posted on 10/11/07 at 05:03 PM |
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quote:
Originally posted by Volvorsport
its not the dowel that transmits the drive - plus doing it like that , you can get it bang on .
Standard trick with Lotus Twincan (which being DOHC used two kent cam sprockets) used to be to drill other holes in the sprocket at say 92 degrees,
184 degrees and 276 degrees.
You can choose the angles according to how far the timing has to change to suit the new cam
Of course the original timing mark has to be replaced.
[I] “ What use our work, Bennet, if we cannot care for those we love? .”
― From BBC TV/Amazon's Ripper Street.
[/I]
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