twin cam question

Side valve, 803, 948, 1098., 1275 and Vizard mods

twin cam question

Postby badobsession » Mon May 06, 2013 11:46 pm

can any one tell me if all the cam wheels are the same
reason is i came across a pair and they have holes in them instead of the solid wheel

see if i can get a pic up later ...
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Postby trog34 » Tue May 07, 2013 12:02 am

I'm sure I read somewhere that they can be different, just check the timing marks in relation to each other. none of my engines blew up from swapping to cam wheels with holes in  :D
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Postby dp » Tue May 07, 2013 9:38 pm

Do you mean inlet the same as outlet or one set the same as another?

I think on the 16valve engines the cam wheel profile changed from a squareish cut tooth to a rounded one. I can't find any pictures of what I mean though. Should be obvious if the teeth don't match the existing oil pump and crank wheel teeth though.
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Postby ohc_turbo » Thu May 09, 2013 7:00 am

i think the 16v ones had large holes instead of solid plastic
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Postby moggyman64 » Thu May 09, 2013 1:05 pm

Hi mark,

Are there no timing marks on them?

If you look at the inlet camwheel the timing hole/mark should be to the left of the locating peg
If you look at the exhaust camwheel the timing hole/mark should be to the right of the locating peg.

There should be some sort of mark otherwise having to remove the rocker covers to set the cams precisely before fitting a belt seems like a lot of unecessary work. I dont think that Fiat garages would have liked to do all that just to replace a belt. You could always overlay and line the dowels of the two different type of wheels and drill a hole through the solid wheel into the hollow wheel to get a timing mark.

regards

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Postby badobsession » Thu May 09, 2013 2:49 pm

this is them ...
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Postby moggyman64 » Thu May 09, 2013 6:05 pm

Hi Mark,

As I thought they do have timing marks cut into them, They will be ok to use as long as you fit the wheels the correct way round, exhaust and inlet, as mentioned in my earlier post, that way the belt should should line up ok with all pulleys and you wont be a tooth or more out which will affect the cam timing. It wiil still be worth overlaying the wheels to double check.

regards

keith

Ps how do I upload a profile picture?
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Postby badobsession » Thu May 09, 2013 7:36 pm

thanks Keith

to up load a profile pic go to your profile page and follow the directions .... :wink:
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Postby ohc_turbo » Thu May 09, 2013 8:16 pm

I can't post the link but there is a thread called deans 1971 traveller that has a tc with your pulleys was going to say yours most likely came from a fwd later 8v lancia or fiat as I have seen them before, as above they will work fine and also being metal they would give better piece of mind from possible teeth shearing off, unlikely but more possible being plastic as standard ones...
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Postby badobsession » Thu May 09, 2013 9:28 pm

the ones on the twink at the moment are metal and solid but i have a head with one steal and one plastic the plastic one has a lip on one side .
will try them on after i get them striped and polished .
thanks  :D
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