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Join Date: Sep 2002
Location: Paris, France
Posts: 34
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Rebuild a SWB T engine to S : Opinion please !
Hello guys,
I currently own a 68 SWB 911 T since a year. It is all matching numbers and in very good condition. Since a couple of weeks, I have a kind of ugly chain noise at the back... near 3000 rpm. Thus, I was planning a carrera tensionner upgrade. It may be the occasion for a rebuilt... My question is that if I have the engine rebuilt, should I keep the T componments, or upgrade to S componments, the price of the 2 solutions being almost equivalent... What are the engine parts I will have to change to get an S engine : Pistons ? Cylinders ? Cams ? Valves ? Should I simply swap engines ? And by the way, how do you diagnose that it is time for rebuilt ? Thank you for your precious answers !  Dooop 
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10-22-2003, 02:12 AM
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Get a compression test will give you an idea of what condidtion the engine is in.
BTW what is the name of that red? Are there many early 911's in France?
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1969 911 T (SOLD), 1977 911SC (SOLD), 1999 BMW M3 (SOLD), Current Car 2005 Lotus Exige Last edited by Aussie; 10-22-2003 at 03:28 AM.. |
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10-22-2003, 03:24 AM
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Location: Paris, France
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Gidday Aussie,
Thanks for the advise. From what compression score is it time for a rebuilt ? a difference between cylinders, under 8 ? BTW, this red is a... Ferrari red ! don't blame me, it is the previous owner's choice, but so nice ! In France, classic 911s are becoming more and more desirable, reaching astonishing prices ! a nice S is now around 35000€ (US$ 40000) see ya down under ! |
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10-22-2003, 05:23 AM
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Doop,
I'd first do a compression check to see if you need a rebuild. Does the car use much oil? since you have weber Carbs it's easier to have your engine changed to S specs. You would have to change just your cams and pistons and maybe your crankshaft but that's not 100% necasary.
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Tim 1973 911T 2005 VW GTI "Dave, hit the brakes, but don't look like your htting the brakes...what? I DON'T KNOW, BRAKE CASUAL!!!" dtw's thoughts after nearly rear ending a SHP officer |
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10-22-2003, 05:26 AM
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Join Date: Jun 2003
Location: Chelmsford, MA
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There are also other options on a rebuild like that. I, for example, have S-cams but a largely mechanically stock L engine, otherwise. The thing absolutely screams at high revs. Jluetjen on here has the opposite -- he's got S pistons with T (I guess?) cams. Unfortunately we wanted to dyno the two cars to get a feel for the difference between the two, but didn't get a chance to this year.
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1968 911L 2004 Dodge Dakota SLT Plus |
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10-22-2003, 06:43 AM
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Beautiful car! Gotta love those rally lights.
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Chaos, panic and disorder . . . my work here is done Current Stable: Maserati GranTurismo S Range Rover Autobiography Various Porsches ~ in pieces |
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10-22-2003, 07:12 AM
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Home of the Whopper
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For a street car I would go with E cams. The power comes on earlier in the RPM range. Go with the S pistons for the increase in CR. My opinion of course.
Good luck! BK
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“The wave is not the water. The water merely told us about the wave moving by” – Buckminster Fuller |
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10-22-2003, 09:16 AM
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Stay away from my Member
Join Date: Aug 1999
Location: Agoura, CA
Posts: 5,773
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Don't forget the distributor also. I don't think you want to use a "T" advance curve with E or S cams.
Gorgeous car Dooop. I am not a big fan of red Porsches in general, but I really like yours!
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Chris C. 1973 914 "R" (914-6) | track toy 2009 911 Turbo 6-speed (997.1TT) | street weapon 2021 Tesla Model 3 Performance | daily driver 2001 F150 Supercrew 4x4 | hauler |
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10-22-2003, 09:24 AM
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Location: Paris, France
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Hello everyone, and thank you for these replies !
So you would suggest, after a compression test, the following upgrades : - cams replacement : S or E cams - Same pistons if they are in a good shape, S pistons otherwise About the distribution, does the operation consists on a tune up, or a replacement ? BTW, what does "increase of CR" means ???   cool if you like the colour, I am getting used to, even if it is a non porsche...These rally lights came as an option from the first french importator of P-cars : Sonauto. Other advises very welcome !!! Dooop |
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10-22-2003, 09:42 AM
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Stay away from my Member
Join Date: Aug 1999
Location: Agoura, CA
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CR is Compression Ratio - "rapport de compression" ? The "S" pistons will result in a significantly higher CR than "T" pistons, which increases power.
The distributors can be recurved/rebuilt to the advance curve you desire.
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Chris C. 1973 914 "R" (914-6) | track toy 2009 911 Turbo 6-speed (997.1TT) | street weapon 2021 Tesla Model 3 Performance | daily driver 2001 F150 Supercrew 4x4 | hauler |
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10-22-2003, 09:49 AM
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Location: Paris, France
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Considering your replies, I am thinking about an other solution, "money-wise oriented" :
I have the opportunity to get a brand new 2.0 110 hp engine (exactly same as mine) which is a 1970 914-6 flat6. It has been used ony a few hours, in mechanic lessons (carbs tuning) of a french mechanic school. The price is fair, and it comes complete except carbs and exhaust system. I am planning to install this engine in my car (losing the matching numbers advantage) and stock the original engine for further rebuilt (and upgrade). Does this sounds good to you guys ? Dooop |
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10-23-2003, 08:45 AM
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1977 Porsche 911 SC 3.0
Lotus
1973 Porsche 911 2.4 MFI
Olive
The Turtle
Ruby
Brownie
