11 replies to this topic

[blakie]

Just after a quick bit of advice regarding cam woodruff keys. I need to get a new one however am un sure what one to get. I see they come from 1' all the way to 9'. Now which do I go for? Or does it all depend on the spec of the engine?

Ta

blakie

[Saxo-Fiesta-Mini]

Best option measure the one you have now with a micrometer

also some woodruff keys alow you to adjust the cam timing hope that helps if not ask the vizard book

[blakie]

Ha ha thats the problem, Ive lost the old one hence having to buy new.

Does anyone have the said book? Does it say in there?

[blakie]

Or do I go for the standard one?

Oh how much I need a vizard book

[Crowson_punk]

measure the length of the slot in the cam, then the depth and width. then measure the depth of keyway in the camgear. Add that to the depth of the shaft keyway and you have the measurements of the key!

Jon

[blakie]

hang on its not the size im after but the timing degree, surely there all the cam size to fit?

[Crowson_punk]

oh I seeee lmao

Tbf it's difficult to say. depends on various factors, such as the ratio of the rockers, the actual cam etc

Best to talk to however you got the cam from, unless it's standard. I'm used to adjustable vernier pulleys so using the keyway to adjust the timing makes my head hurt lol

Jon.

[blakie]

Ok cheers John. Well its a piper 285 cam.

May have to make a few phone calls tomorrow and find out.

blakie

[jackson-minis]

Not sure if i can be of any help mate but ive got the piper 285 that ive just timed in on my new engine build. When you put an aftermarket cam it can be out quite abit. For a 285 the timing should be set to 107 degree's, you measure this on a dial guage and using a timing disc and pointer, its really easy when you figure out how to do it, a useful link i found was: http://www.ime.org.u...c/cam_time.html
My cam when i used the standard woodruff key was actually timed in at 100.5 so i pout a 7 degree woodruff key in to take it to 107.5 allowing for the slight slack in the chain as its a new chain and timing gears. so now my cam is timed in at 107.5 degree. I did do alot of research into it and found through vizards bible and other sources that if the cam is say timed in with a standard key i.e not timed in properly as was my case the cam would make little or no difference, basically time it in if you can get hold of a disc and dial guage.
Hope thats helped, gazz

[GraemeC]

Start with a standard one and either fit and forget or, for optimum performance, measure the cam timing it gives and use this to buy the correct offset one for you set up.

[mike.]

As above, start with a standard one, then measure what degree that gives you. You need a DTI gauge and a timing disc to do this. When you've measured what degree your cam is at before TDC you can work out what you need. If you ring piper or a supplier of that cam, they'll be able to tell you what degree that timing should be set at for that cam, and then you can buy that offset of woodruff key. Once thats fitted it'll offset the cam by the right amount for optimum performance.

[blakie]

Yeah that makes sence I suppose. Ill get the standard key and go from there. May well order the 7 degree kety as well and give that a try