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Join Date: Jun 2006
Location: Adelaide Australia
Posts: 886
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Hi Mark
Keeping the SSI's just in case i need some heat - might do Targa Tassie one day....even Classic Adelaide had some wet weather last year and the demister was needed. George Cairns in Melbourne makes the muffler hence the name. I know at least once guy running in Sb Historics using one on his '67S with good results and also a heap of tarmac rally guys - both MFI & carbs Obrut (Ryan is one) I'd guess at it being about 1/3 lighter than my triple outlet rally muffler I had on before. When I switched to the Cairns muffler I lost none of my top end and it literally flattened out the 'on cam' feeling of the S cams from about 5k up. Lots more mid range which it sounds like you could do with! Planning to run a single MSD - twin plug system with 2 MSD coils. In terms of the cams I guess time will tell but I know Kenik and Camgrinder worked on the combination of a good top end combined with bottom end pull. I believe the key is the 102 degree lobe centres matched with the heads. Planning to stick to about 8k but I guess time will tell on that one 
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
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10-05-2009, 09:40 PM
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Location: Adelaide Australia
Posts: 886
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Engine is done! Final specs are as follows:
• 2.4 7R 911/91 case, shuffle pinned, oil bypass mod, 996 turbo pump, case savers, resurface & line bore • 66mm ‘S’ counterweighted crank , cross drilled, balanced magnafluxed + micro polished • Pauter rods • 10.5:1 JE pistons – mechanics special recipe • Nickies 85.5mm barrels (sized to racing regs here) • DC 44 Cams on 102 degree lobes • JB Racing Twin plug distributor • Supertec head studs • Heads ported, racing valve springs & titanium retainers ( Steve Weiner) • Webers with tall secondary venturis, port matched tall PMO manifolds • Aussie made ‘Cairns’ muffler • Single MSD This things rocks! Public thanks to Kenik who's engine specs I basically copied other than induction and minor odds and ends. A very fun day at the track today
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
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03-03-2010, 11:01 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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Sweet!
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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03-03-2010, 11:11 PM
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Max Sluiter
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This thread is worthless without photos (or better yet, video with stereo sound).
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance Last edited by Flieger; 03-04-2010 at 01:31 PM.. Reason: spelling |
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03-04-2010, 12:10 AM
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Join Date: Jul 2001
Location: Portland Oregon
Posts: 7,007
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Good news, indeed,....
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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03-04-2010, 12:11 AM
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Quote:
I have been following this thread for two years and this is all we get! Come on! Sounds like a cool motor. Post some pictures and or video soon!
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Bill K. "I started out with nothin and I still got most of it left...." 83 911 SC Guards Red (now gone) And I sold a bunch of parts I hadn't installed yet. |
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03-04-2010, 04:29 AM
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Location: Adelaide Australia
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Nothing like an audience
I'll post some stuff when I get home to my own computer. Thanks also to Herr Weiner, for the magnifcent head work ! Ballpark numbers are around 220 HP at the flywheel....
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
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03-04-2010, 09:06 PM
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Location: Portland Oregon
Posts: 7,007
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Quote:
You are most welcome,...... Those things do move some air right along. E-mail me your dyno sheet when you get a chance.
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Steve Weiner Rennsport Systems Portland Oregon (503) 244-0990 porsche@rennsportsystems.com www.rennsportsystems.com |
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03-05-2010, 03:04 PM
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3 restos WIP = psycho
Join Date: Feb 2005
Location: North of Exit 17
Posts: 7,665
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It is a beautiful thing when a plan materializes as planned. That is just awesome.
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- 1965 911 - 1969 911S - 1980 911SC Targa - 1979 930 |
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03-05-2010, 04:23 PM
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Location: Adelaide Australia
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I'm going to get the car back to the mechanic next week. The emulsion tubes (F3's) need a bit of sorting, mixtures are good but transitioning up from 2500-4000 at part throttle is a not quite smooth. Will try to get it back on the dyno as its only been run to 7300 on its set up run. Maybe F 26's might be worth a try?
Fairly conservative advance at the moment as well. Running 34 venturis still, not sure if 36's might kill the low rev driveability a little..... The track day might have helped things loosen up a little as well so another run up to 8K might be interesting! Will do Steve
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
Last edited by cameron.arnott; 03-05-2010 at 09:01 PM.. |
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03-05-2010, 07:08 PM
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Location: United Kingdom
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Cam - great to see the time taken and investment in research (and no doubt the saving up) has paid off.
Looking forward to pictures, video and dyno sheet :-) Ian
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Ian Highfield 1992 964 C2 Manual with RS Suspension etc. 1973 911T Narrow body Hot Rod with 2.7 Carrera engine and loads of period modsl - SOLD 1986 Carrera Coupe Sport with Stainless Silencer and SW Chip (256 fwbhp) - SOLD |
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03-06-2010, 03:51 AM
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Location: Adelaide Australia
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Thanks Ian
The car is going back to the mechanics this week for a little bit of a fiddle. Hopefully I'll have a new dyno sheet at the end of the week. I've just flown back home and relaised I didn't take a copy of the first run sheet  Bugger!Cheers
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
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03-07-2010, 06:59 PM
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
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03-08-2010, 03:24 AM
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
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03-09-2010, 03:02 AM
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Sounds great!
It is nice to see some leaves on the trees too!
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Bill K. "I started out with nothin and I still got most of it left...." 83 911 SC Guards Red (now gone) And I sold a bunch of parts I hadn't installed yet. |
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03-09-2010, 04:33 AM
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Max Sluiter
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Bonza!
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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03-09-2010, 03:38 PM
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Location: Adelaide Australia
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Trees? What trees..?
Edit: oh those trees! Couldn't remember seeing any
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
Last edited by cameron.arnott; 03-09-2010 at 06:10 PM.. |
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03-09-2010, 03:39 PM
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Location: Mount Airy, MD
Posts: 4,299
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Is there a dyno sheet on this puppie yet? Enquiring minds!
t
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1967 912 with centerlocks… 10 years and still in pieces! |
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04-21-2010, 12:54 PM
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Hi Tadd
Here's the original Dyno run from the engine break in runs. As per the other post this run was only to 7300rpm when the limiter kicked in (it was still set to the old engine spec on the MSD2 and they had thought at the time it needed a different plug in vs turning the adjuster screw!) They had a bit of a fiddle after the 1st track day with emulsion tubes etc but had a batch of race cars to prepare and ran out of time before the car carrier collected it to bring it north to where I live. Hence no second dyno run I would like to spend some more time getting it perfect but there is not a heap of talented Porsche mechanics where I live.......There are still some surging issues on the idle circuit, particularly when cold but it pulls like a steam train, and has loosened up a little from the beginning. I'm guessing 220-225 at the crank at peak HP. Rev limiter is set at 8000. Cheers
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
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04-21-2010, 03:15 PM
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Sorry now attached.....
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'74 RS 3.0 Replica Porsche 968 Clubsport SOLD '70 911E Bahia Red SOLD '71 911 S/T Replica 2.3 Twin plug BEAST SOLD
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04-21-2010, 03:25 PM
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1971 Porsche 911S
1983 Porsche SC
