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S1 and S2 Cam swapability

 
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Mclaren924  



Joined: 13 Oct 2021
Posts: 14
Location: California

PostPosted: Fri Jan 14, 2022 10:32 am    Post subject: S1 and S2 Cam swapability Reply with quote

I'm rebuilding a 1982 S2 engine and have been on the hunt for a cam and mechanical followers. I thought I found my winner when I came across piper cams but after a quick chat with a rep there he said that the S2 cam is different from the S1. Can anyone confirm or give some input.
Cheers
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924-76  



Joined: 05 Jun 2006
Posts: 1455
Location: Ontario, Canada

PostPosted: Fri Jan 14, 2022 11:28 am    Post subject: Reply with quote

924 turbo cam are all the same, and if I remember correctly all 924 cam are the same, NA and turbo.
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anthonimartini  



Joined: 17 Feb 2020
Posts: 232
Location: portland oregon

PostPosted: Fri Jan 14, 2022 12:26 pm    Post subject: Reply with quote

yeah the cams are all basically the same. there is a very early cam that i believe was directly from the audi 100. please keep us updated on what you do for lifters. i still have a good set but am always looking for options.
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Carrera RSR  



Joined: 08 Jan 2010
Posts: 2241
Location: Somerset, UK

PostPosted: Fri Jan 14, 2022 6:40 pm    Post subject: Re: S1 and S2 Cam swapability Reply with quote

Mclaren924 wrote:
after a quick chat with a rep there he said that the S2 cam is different from the S1


He needs some further education.....

All stock 924 cams are the same. Stock cam is already good for turbos, especially stock and mild tune. Avoid high lift/duration aimed at NA use and not turbo. I run a 270 Piper in my turbo without issue. Newman cams come recommended also.
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1980 931 - forged pistons, Piper cam, K27/26 3257 6.10 hybrid turbo, 951 FMIC, custom intake, Mittelmotor dizzy & cam pulley, H&S exhaust, GAZ Gold, Fuch'ed, Quaife
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Mclaren924  



Joined: 13 Oct 2021
Posts: 14
Location: California

PostPosted: Mon Jan 17, 2022 12:56 pm    Post subject: Reply with quote

I have all the pet manuals and I couldn’t find a different but a guy at piper told me that the s2 and s1 cams were different. This is very helpful information as I plan to get an ultimate road cam from piper. I would use the stock cam but it’s not much good after the previous owner let the belt snap… As for lifters I’m not entirely sure but will probably end up going with solid lifters . Any suggestion or advice is much appreciated as I really do need more education on this…
Cheers
Malcolm
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 1119
Location: Maysville, Colorado

PostPosted: Tue Jan 18, 2022 12:10 am    Post subject: Reply with quote

I believe both Piper and Newman can make solid lifters. I use the ACM ones from Sweden, they were relatively inexpensive at under at under $150 per set, RD Spring in CA might also have them, he supplied my Chevy LS spring and retainer setup for the 931 head. You do have to use shims for valve clearance, I use ones from the Alfa 105(9mm) motor as they come in a wide range of sizes and cost about $6 each, Valve adjustments are a pain because the distributor and cam have to be removed but that's life. Some people say to get less expensive fixed thickness ones and have them surface ground to fit, butt as busy as most motor machinists are I find the Alfa system much quicker and cheaper.

I adjusted six valves on my race NA(barely modified) race car motor by swapping 4 around and buying 2 new ones, cost under $15.

Our method for initial adjustment was to assemble head with lifters and cam then measure for each. Shims showed up about 4 days later.
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Mclaren924  



Joined: 13 Oct 2021
Posts: 14
Location: California

PostPosted: Tue Jan 18, 2022 9:44 am    Post subject: Reply with quote

Excuse the stupid questions I’m about to ask but are lifters and followers the same thing? I currently have new inner and outer oem springs on the way along with valve guides, valve seals, and new valves for the ones that got smashed when the belt snapped. Also do I have to get the valve seats cleaned up at a shop or how should I tackle those. Thank you for the help
Cheers
Malcolm [/i]
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Mclaren924  



Joined: 13 Oct 2021
Posts: 14
Location: California

PostPosted: Tue Jan 18, 2022 9:50 am    Post subject: Reply with quote

Excuse the stupid questions I’m about to ask but are lifters and followers the same thing? I currently have new inner and outer oem springs on the way along with valve guides, valve seals, and new valves for the ones that got smashed when the belt snapped. Also do I have to get the valve seats cleaned up at a shop or how should I tackle those. Thank you for the help
Cheers
Malcolm
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Mclaren924  



Joined: 13 Oct 2021
Posts: 14
Location: California

PostPosted: Tue Jan 18, 2022 9:51 am    Post subject: Reply with quote

Excuse the stupid questions I’m about to ask but are lifters and followers the same thing? I currently have new inner and outer oem springs on the way along with valve guides, valve seals, and new valves for the ones that got smashed when the belt snapped. Also do I have to get the valve seats cleaned up at a shop or how should I tackle those. Thank you for the help
Cheers
Malcolm
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MikeJinCO  



Joined: 08 Jun 2010
Posts: 1119
Location: Maysville, Colorado

PostPosted: Tue Jan 18, 2022 11:08 am    Post subject: Reply with quote

Yes lifters and cam followers are the same thing. If it is a NA motor having a shop do the valve is by far the best as they can go a 3 or 5 angle seat and also back cut the valves to help the flow a bit.
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Poco a Poco, #033 '78 Vintage racer, SCCA Dp-81
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Mclaren924  



Joined: 13 Oct 2021
Posts: 14
Location: California

PostPosted: Tue Jan 18, 2022 11:50 am    Post subject: Reply with quote

Once again another dumb question but, assuming I had the unloaded head prepped at a shop and the seats done. Would I be able to do a three angle job myself or is this just worth taking it to a shop?
Cheers
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Mike9311  



Joined: 14 Dec 2004
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Location: Chicago-ish

PostPosted: Wed Jan 19, 2022 12:10 am    Post subject: Reply with quote

Mclaren924 wrote:
Once again another dumb question but, assuming I had the unloaded head prepped at a shop and the seats done. Would I be able to do a three angle job myself or is this just worth taking it to a shop?
Cheers


Just let the shop do it. Tooling up for the job is so much more

The 'seats' part is where they will apply the three angle's

There are some of us that do stuff like this ourselves but the effort and possibly money in the beginning can be crazy.
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