One for Andychain? 750GT cam chain

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lemonjelly

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I"ve just read Phil Trotters editorial in the current LVV and I ve heard of cam chains being too tight/small,but seems the only way they got it to fit was to hone off a chunk of the nylon roller,or even take out the tensioner altogether (until it  stretches),all seems rather drastic but I will encounter this on my own GT resto and would appreciate anyones experiences and manufacturers etc.

LJ
 
There was a batch (or 3) of Regina cam chains that were too tight.
I threw away 3 Regina chains for this reason and have since used Andy's chains with no issues.
 
That is the duplex I believe.

I only use cam chain as used by Merc, BMW, Porsche etc etc.

Most "cam" chains on the market are industrial.

Andy
 
That"s good to hear Andy.Will be intouch.

(Norm I"m tri-camual now :D)
 
Hi, LJ.
See my camchain-thread in the "How to"-section
and Keith's comments.
Especially when the head and cyl. have been off
the engine, the problem occurs, because they
haven't set yet.

hth
Ernesto
 
In most cam drives the "tensioner" is more of a guide.

Due to the catena effect in a cam drive is is quite an important feature.

Using an industrial product is actually not a problem but thoroughly degrease
it before fitting as the lube takes up the tolerance and can make it hard to
fit.

Cam chain is made to different, higher tolerances and very slightly different
dimensions........try fitting a crank link using cam chain outers, but more
importantly is not only pre-toleranced but also pre-run, in the case of iwis
anyway. This means that you fit and basically forget.

Going back to basics, a cam drive is very high speed so there is very little
torque involved. The Aston race engines, V8 and V12 run a tiny 8mm chain
as do Ginetta and M Sport Fords. Norton Commandos also run an 8mm chain
but I think there are problems but as we have fallen out I wont get involved.

Have fun and ride it like you stole it.

Andy

PS The little 380GT has the engine out and I am happy that my friends in the
trade have come up with some rare spares and lots of help.
 
 
thanks for that Ernesto ,makes alot of sense to set on a rebuild,combined with a petrol soak and if not a smaller wheel from Keith as well.?If it arises.

LJ
 
There was discussion ages ago on here about bad spec cam-chains for triples and twins just as you experienced. If you get a chain today from Andy or one of the reputable suppliers often noted on the forum you will get the proper thing.
 
Hi Shaun - I've found many makes of cam chain to come up tight when new on the 750's. I always have to mill the heads or barrels on my own bikes  so don't have problems - if you've access to a mill or someone who'll mill it and head is stripped - why not get 10 thou taken off to make sure you wont have problems - Regards - Phil
 
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