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Title: Camwheel question Post by: RobD 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... (http://i1091.photobucket.com/albums/i384/9JOT/Engine%20parts_zpsx3tm7ibx.jpg)[/URL] Title: Re: Camwheel question Post by: the.cern on 12 January, 2016, 01:26:15 PM Bundle of joy ........ an apt description.
Title: Re: Camwheel question Post by: roddy 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 Title: Re: Camwheel question Post by: lancialulu 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???
Title: Re: Camwheel question Post by: RobD 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. Title: Re: Camwheel question Post by: peterhedge 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?
Title: Re: Camwheel question Post by: lancialulu on 26 July, 2016, 08:26:10 AM Peter
Rob lapsed his membership so now longer on this forum..... Tim Title: Re: Camwheel question Post by: roddy 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 |