SC components woodruff keys
Turbo Mini Forums

Hi guys,

I was just dry fitting my head with the conversion kit I'm machining and noticed I have the keys to my K1100 camshaft sprockets missing. The sprockets and cam adapters were bought from SC components. On their website it says that keys are woodruff type, but the ones I have bought from them have a straight keyway, so I'm confused whether the woodruff keys type really fit ?

Thanks in Advance

I thought they just used a parallel key.

So, specialist components claim to make their own pullies, but appear to still use the awful adapters, the mind boggles sometimes


carl

WWW.FORCE-RACING.CO.UK PLEASE CLICK HERE

My concern about the adapters is that the only thing constraining rotation between the camshaft and the adapters is a very small dowel pin. If this snaps under load, the engine will be destroyed in a second.

With regards to the keys, for me they seem to be just the parallel type.

a woodruf key seems to apply to any form of ke locking a pulley to a shaft these days, not sure if this was always the case?

theres two reasons SC use the adaptors, for backwards compatability, and the adaptor incorperates a slight oil thrower lip.

in terms of the pin being the only thiong between the cam and adaptor, well this is the case with the std engine and pully, its not somthign you can change unless you start remachining cams. I'd have to check but I'm pretty sure that pin is a hardened pin so shouldnt be giving issues.

You're probably right Joe about the pin being hardened.

So about the keys, have I understood correctly ? You're saying that the term "woodruff key" applies even to the parallel type key ?

Yeah, you are right, there are parallel an woodruf keys, but these days any key seems to get called a woodruff,

And now I'm thinking about that bit in Wayne world with the champagne... Lol

Hehe xD didn't know what you were talking about for a second, but after a quick search, yeah it fits the description lol

Thanks again for the help, so I'll measure the keyway and buy a suitable one then.

pretty sure its a standard size that you can get in strip and then cut to length. possibly 1/8" ( just over 3mm?)

the pins on my adaptors got butchered by the previous owner so they don't do anything.
So I don't need to buy new adaptors from SC?

Here for the craic..

Supercharged Arden powered

True it's not going anywhere with that m10 bolt done up, as long as it's done up!

That said I hate pulleys that don't have a key or mark to line them up, vaxhaul used to do this in their 8 v engines, and to time them back in you had to measure the lobes... Which were prone to wear.... Basically passing into the wind.

So the tension in the bolts got that enough force to drive the cams ? @Sprocket.

I've seen setups like that but, the shaft is usually tapered in such case.

Cant comment on the SC stuff on the dimensional aspect of just using the tension of the bolt to hold things in place, but i had my original development kit with Ford pulleys and steel adapters up to 8k rpm no bother. The Force Racing pulleys are based on this design but 'one piece' centres doing away with the necessity of any sort of adapter.

Evolution of pulleys from the original concept using the Ford pulleys, through the keyed adapter much like the SC ones, to the 'one piece' Force Racing pulleys. Incidentally, all three of these pulleys included an O ring seal designed into them to ensure oil never leaks past, which was not always the case with the SC pulleys.

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Incidentally, those 'generic' vernier pulleys everyone is keen on using have a shit tooth profile. Its not even close to the original OEM pulleys, or the belt for that matter.

Edited by Sprocket on 9th Aug, 2017.

Yeah, the pulleys I bought from SC has the O-ring incorporated in the shoulder of the bolt.

I have to ask, where is this O ring location on the force pulleys? Ive sketched up a design for, and was literally this week going to machine mine to take a large X-section hydraulic ring seal.

Originally in the end of the cam adapter when using the generic keyed pulleys.

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Edited by Sprocket on 9th Aug, 2017.