Back in OCG911T'S thread https://www.early911sregistry.org/fo...rease-Question two and a half years ago, I wrote:
To recap briefly, a description of the car and how and where I intend to use it:I've been lurking on this thread and others similar here and on Pelican for the same reason: I have a 2.2T and have been considering going the 2.5SS route in the next year or two. I had mentally settled on 90mm P&Cs with custom pistons to raise compression to 9.3-9.5:1, with E cams and on my stock T crank. I'd also considered swapping the Zeniths for Webers which would entail finding Sporto-specific Weber manifolds, since swapping gearboxes is not an option (and outside the scope of this thread - no hijack!).
On the head end of things, it's been suggested to me that I not bother with head work but swap in later 2.7S heads which aren't hard to find and are reasonably priced. As my T is of the 1970 variety, it's possible I'd need squirters and other case work. This setup might need additional cooling in the front fender as well.
A twist to my situation is that my car had a top end done about three years before I bought it, in early 2006. There was a minor amount of head work done as the compression is slightly higher than that of a stock 2.2T (exact number I'm not sure, didn't commit the PPI report to memory but can dig it up). I wonder from time to time if I'd be better served by putting the engine on a pallet and sourcing a well-built 2.7 or 3.0.
Suspension/braking status: Bilsteins front/rear; fronts are inserts in Boge housings. Factory 15mm sways front/rear. 21/27mm torsions front/rear (hollow Sander, Elephant plugged/plated). Front calipers are Alfa GTV Brembos (fits those Boge housings), rears standard. Porterfield R4S pads. 195/65 P6000s on 7X15 Fuchs is how the rubber meets the road. I'm pretty satisfied with this setup.
(edit: Here's a recent photo for reference. Actually, not that recent as you can still see the M calipers up front. Yes, this Sporto-equipped car did not come with S front calipers.)
Some self-imposed constraints: Retain Sporto; retain carbs; single plug. Retain narrow body.
How/where would I use it: Almost exclusively on the street and almost exclusively east of the Mississippi. Highest altitude might rarely be 4,000-6,000 ft but most of the time from sea level - 2,000 ft. Would love to drive on on of those Mountain Mille type events if health permits.
What would seem like a simple route: slip fit 87.5mm Nickies w/9.5:1 CR JE pistons; 911E, mod-Solex or DC30/35/40 cams (would need recurved distributor); SSI exchangers; Dansk sport, Porsche Classic or SCART exhaust, 2 in/1 out. Retain 2.2T heads and crank. Could either rejet Zeniths or spring for PMO 40.
What had also been suggested to me: slip fit 86mm AA biral cylinders with JE pistons to reach that 9.5:1 CR, then split my case and swap out my 66mm crank for a 70.4mm crank. Same heads, cams, carbs, exhaust scenario. Initially this sounded like an option but have heard less-than-good things about the AA products and figure that once my case is split, Pandora's box of machine work is opened. So I'm not as keen on this option as when first presented.
OCG911T ended up going the 87.5/9.5:1 route and I'd like to think I could do that without opening my case. I've spoken to several shops in my area and no one wants to build anything on my case. They all tell me to put my matching-numbers engine on the pallet. (Who out there wants a matching-numbers driver-quality 2.2T Sporto? I didn't think anyone did; that's how I was able to get mine.)
Another option: Some folks have told me just to pick up a used 3.0SC motor and plug and play. I'd have to find a Sporto manifold for that (Sporto SCs do exist but they're rarer than Sporto longhoods), then also deal with new wiring, a different ignition system, the SC tach and some kind of tach-adapter for the SC tach. Swapping CIS to carbs might help a little but not much. I've had a couple of 3.0s offered to me but I didn't move fast enough on them. Also a couple of motors (2.7, 3.0) that look promising but have no known history. This seems easy enough but I'm just not sure a 3.0 or even a 3.2 is keeping with the spirit of the car.
The most involved solution, but after the simple route maybe the most trustworthy, may be to start parts hunting: find a 7R case (2.4 or 2.7, not picky) and go that 90/9.5:1 X 66 route, same cams, carbs, exhaust. Just build or have built the whole shooting match.
In all scenarios except the slip-fit routes I would expect to have to add a front fender-mounted cooler. I'd also expect to use a 3.0SC or newer oil pump.
So yeah, I've been dragging my feet for a couple of years on this one, but I'd still appreciate some input and feedback as to the feasibility of each route. Thanks.
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Originally Posted by edmayo
