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Author Topic: Camwheel question  (Read 1477 times)
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RobD
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« on: 12 January, 2016, 10:56:39 AM »

Having recently purchased some Series 1 camwheels with the vernier adjustment and the corresponding series 1 cam chain I'm now puzzled. I was under the impression the series 1 camwheel used a different pitch chain than the type fitted to later cars and yet the pitch of the teeth on the early camwheels which I have is identical to a set of non vernier later camwheels taken from a series 3 . Am I missing something here?
Here's a pic of a bundle of joy from Italy which arrived early in the new year...

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« Reply #1 on: 12 January, 2016, 01:26:15 PM »

Bundle of joy ........ an apt description.
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roddy
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« Reply #2 on: 13 January, 2016, 12:12:52 AM »

Have 'fun' putting all the bits in the correct places........

The chain pitch is the same for both S1 and S2/S3 cars.  It is the roller diameter that is different.  S1 chains have larger diameter rollers, so the teeth in all the chain wheels have a larger 'hollow' between them.  Conversely, S2 cars have a chain with smaller diameter rollers, and different chain wheels throughout.  S3 cars have the same chain, but the cam chain-wheels are key-way'd on to the shafts, so no vernier adjustment.

Regards - Roddy
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Roddy Young
Dunfermline, Fife

1970 Fulvia Sport S1 1.3S
1972 Fulvia Sport 1600
lancialulu
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« Reply #3 on: 13 January, 2016, 09:39:12 AM »

Hence you need the S1 crank sprocket..... Nice Pistons - I thought you were not going for higher comp???
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1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
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RobD
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« Reply #4 on: 13 January, 2016, 11:37:31 AM »

Thanks for the clarification Roddy.
Hey Tim, having considered all the options I decided I was only going to through this exercise once and therefore I might as well build something interesting. So, I've plumped for 11.1 compression, slightly larger inlets, new valve springs and for good measure I've gone for new bolts and gaskets throughout. Using standard cams we're going to introduce a bit more overlap in the valve timing and hopefully in conjunction with the GP4 exhaust and inlet manifold,plus a set of new DHLA 40s and careful attention to balancing the crank , flywheel and clutch it should go quite well.
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You're all entitled to my opinion.
'75 Fulvia 1.3S
'68 works Laverda 125cc ISDT
KTM 640 Adventure
Yamaha TDM 900
Numerous Gas Gas trail bikes...
www.adventureride.co.uk
peterhedge
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« Reply #5 on: 26 July, 2016, 07:50:39 AM »

Hi Rob, looks like I'm on a similar journey to you, do you mind me asking where you bought the pistons, valves and springs?
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lancialulu
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« Reply #6 on: 26 July, 2016, 08:26:10 AM »

Peter

Rob lapsed his membership so now longer on this forum.....

Tim
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Its not the winning but taking part! or is it taking apart?
1955 Aurelia B12
1967 Flavia Vignale iniezione
1967 Fulvia HFR
1972 1600 HF
1972 1600 Fulvia Sport
1978 Transformer HF3000 Strato's replica
1979 2500 Gamma Coupe
1988 Delta 1.6GTi.e.
roddy
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« Reply #7 on: 30 July, 2016, 11:28:34 PM »

Hello Peter

From the photograph in the first post, you can see that 'Cavalitto' is stamped on the crown of the pistons.  I sourced pistons from them about 18 months ago.  The firm get them made by CPS in Turin. Cavalitto offer standard or raised CR pistons, both cast and forged.  If the size is not in stock (as was the case for me), the supply came in 5 days, with then quick and excellent despatch to the U.K.

Hope of use?

Regards - Roddy
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Roddy Young
Dunfermline, Fife

1970 Fulvia Sport S1 1.3S
1972 Fulvia Sport 1600
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