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-   -   Why is SC engine often referred to as bulletproof? (http://forums.pelicanparts.com/porsche-911-technical-forum/289299-why-sc-engine-often-referred-bulletproof.html)

ChrisBennet 06-20-2006 02:54 PM

Quote:

Originally posted by RickM
When I had asked 3.2 owners with failed rod bolts to identify themselves I don't believe one did.

So, while they MAY fail under very extreme conditions I still don't think it's at all common.

Feel free to prove otherwise.

SmileWavy

I agree, it isn't that common but it isn't an old wives tale either.
The failure mode of 3.2 rod bolts is to stretch (not break) which then causes the rod bearing to get pounded out. One of the side effects of this problem is a scarcity of good used 3.2 cranks compared to 3.0 cranks. When I was looking for a 3.2 crank a few years ago Bruce Anderson contacted me because he had a friend looking for one also. (He wanted me to let him know if I found one that I wasn't buying.)

In addition to the head stud issue, early SC's are busting valve springs (there was a bad batch) as well. The oldest SC's are 28 years old now and that is taking it's toll on their reliability but the bottom ends on those motors have a well deserved reputation for reliability.

-Chris

DARISC 06-20-2006 03:14 PM

MOMO3.2 -
Where did I get 80lbs? From one of those other hype the SC bash everything else threads...http://www.pelicanparts.com/support/...amingdevil.gif

ficke 06-20-2006 03:19 PM

Momo3.2 You have a cool car.
Darisc I think you have it right on in the difference between these cars.
I have owned at different times not at the same time ( because of $$), A lot of different cars All were good cars that I enjoyed in there own way. They all had there pluses and minus. I now own a 67 911S with a 2.0L, The engine had short comings, over heated in Tucson because there is no aux, cooler, 2.0l deep dome heads ping with the mild really compression of the S piston's etc. etc. Not being a stickler for stock, because I believe improvements have been made since 1967 and I enjoy driven it , when I rebuilt the engine used these great features of the newer engines ( Now has Aux oil cooler, piston squirter's, by pass mod. twin plug, Carrera chain tenioners and oil pump, etc.) but I kept it 2.0L with carbs because I like the feel of the engine.
When people say my car is a glorified VW I agree because it is.
I grew up hot rodding VW,s that is most likely why I like Porsche's. So I say, Lighten up, these cars or not perfect, none of them. That does not mean they are not great cars, all of them.

MOMO3.2 06-20-2006 03:56 PM

Thanks ficke!

DARISC:

I put one of the winky smiling faces at the beginning of my post so it was ok to be a dick--right?

Anyway, Darisc, your SC really is the bomb. No wonder you are so pumped over it. I would be too.

Mike

DARISC 06-20-2006 04:30 PM

MOMO3.2 -

Like I said! Get odda heah! Whaaad evah!
Umm, Momo - that's an Italian name isn't it...Sir?
You wouldn't be affiliated with....
Really... no offense intended. I wasn't SCerious!

Mmm, Uh oh :(

DARISC 06-20-2006 04:53 PM

ficke -

An S such as yours, a mechanical maladroit such as myself can only daydream about ever posessing. What's it weigh? I'll bet it's REALLY nimble!

Ahh, in the true spirit of the emergant truculence that I've seemed to provoke in some on this thread, I gotta tell you:

Your MIDGET ain't nothin' but a WALLEYED BUGEYE! http://www.pelicanparts.com/support/smileys/wat3.gif

David

asphaltgambler 06-20-2006 05:15 PM

We put a whopping 3K miles on our 'new' 85 targa when the rod bolt(s) let go. Car had @95k on the clock with good history. We did not abuse it, just bad luck.......possibly.

This is the main reason I did not just buy another used 3.2 - so I agree that the 3.0 was tougher all around

ficke 06-20-2006 05:18 PM

Ahhh Darsic, us midget owner dream of the cute good looks that those bug eyes get, so to try and capture some of the bug eye spirit I am putting Cibie lights on my 911. The Porsche weighs 2280 with spare tire , tool kit and full tank. no driver. Now with the work on the engine I can flog the piss out of it on the track when it is 103 and keep up with the big engined cars ,kinda, we quit driven here in the summer, season is winter, kinda opposite from northerners. Just for reference the 1970 BB Corvette I sold to buy the 67S weighed 3600, I guess I like change.

ficke 06-20-2006 05:25 PM

Darisc, looks like you like a wide variety also:D

Laneco 06-20-2006 05:31 PM

This is the bottom end of our 3.0 at 149,000 miles. It did have two fractured (not pulled) headstuds. Ran absolutely perfect.

Love these motors.
angelahttp://forums.pelicanparts.com/uploa...1150853499.jpg

pwd72s 06-20-2006 05:32 PM

82 SC Driver

Registered: Sep 2005
Location: CARLSBAD CA
Posts: 178
Why is SC engine often referred to as bulletproof?

Because it's "understressed". Kind of like the original SBC V-8.

DARISC 06-20-2006 06:30 PM

ficke - Tell me if it's bad form to hijack my own thread. I'm a dumb newbie.

Yeah, variety's good in both cars and women (gotta admit though, I could use a little more luck with both!). Like you, they own me one at a time (the cars). you're several up on me though; being an expert cross threader, I leave the wrenching to wrenches.

This will probably sound downright goofy - but maybe not to you, having had a Midget (can I say that?);

When I decided to get back to the basic feel of a pure sports car and bought the SC, I'm driving down the road and suddenly it came to me - I ain't quite felt this down to earth and simple mindedly exhilarated on four wheels since, uh, since my first sports car, my cherry red 59 Bugeye! Drove it w/my girlfriend an entire N.E. Ohio winter with the top down, rain, snow, swear to god! - only time ever neither of us even came down with even a head cold!

I remember numerous late nights alone in my folks driveway, quietly taking off the windshield (4 bolts as I recall) and the muffler (equally simple to remove)and pushing it out of earshot of my old man before firing it up and ripping off into the night at 3 ayem out to nearby country twisties, waking up lots of cows, chickens & farmers with the outrageousely loud unmuffled exhaust note of that miniscule 948cc, 48hp 4 banger! I would usually be Sterling Moss while doing this.

Some great life experiences grow dim as time passes.

And then my SC comes into my life and brings it all brightly back!
How can I not have fallen in love with her ?!!

Like I say, you guys who take the time to read this twaddle will either think I'm goofy,....or you'll understand.

Bottom line, it took an old Porsche, a car that I had my entire life scoffed at and had no desire to own, to give me this gift. Belatedly it may be, but now....I SEE THE LIGHT!

danl 06-20-2006 06:54 PM

Quote:

Originally posted by pwd72s
Why is SC engine often referred to as bulletproof?
Because it's "understressed".

It is cool to think that the 3.0 layout was designed and built to take "Turbo Power" and then given only 60% of the HP to handle.
The beauty of every 911 motor is that there is more than enough subsequent R&D to make every engine bulletproof.

I would like to "live" with a Carrera for a little while to see if I would l love it as much as my SC. I probably would....

911 Rod 06-21-2006 05:19 AM

Weight.
You haven't convinced me a 915 SC weighs any less than a 915 Carrera.
Every SC I've seen has power everything and most have sunroofs.
My 86 on the scales came in at 2625 with 3/4 of a tank of gas.
Air con removed but that's about it.
Maybe with my dual exhaust, bilstein sports etc etc just make it feel raw.
I've actually never been in an SC or another Carrera other than on the track.

JBO 06-21-2006 05:39 AM

Most SC's do not have power seats (do any?), which adds significant (worthless) weight. That is the biggest difference I can think of - not sure what else there might be. That is easily rectified with aftermarket non-power seats. Thus I don't think the weight difference between SC and 3.2 915's is a big deal. Talk about worthless, my BMW 7 series has power/reclining rear seats - how stupid!! The battery is under the rear seat bottom on that car, and I was flabbergasted at how much the power seat bottom (just the seat bottom) weighed when I pulled it out to replace the battery.

911 Rod 06-21-2006 05:50 AM

You guys are worse than a wife as far as spending goes.
I'm going to see at lunch time a set of 80 930 sport seats.
What do you think the weight savings is?
(btw I'm going to start a sport seat thread)

Huh 06-21-2006 06:43 AM

911 Rod here is some info:

http://www.356-911.com/post1974/performancefigures.htm

http://www.adelgigs.com/911performance.shtml

it appears the SC weighs less and has comparable 0-62mph numbers. I could live with these numbers and justify a $5K average jump in price.

911 Rod 06-21-2006 06:56 AM

So the older SC's are actually heavier than the Carrera.
Hmmm RS!

JeremyD 06-21-2006 07:39 AM

I just decided to get more HP - I can loose weight later :0

and while I had my engine apart (only layshft bearings looked worn, but I replaced them all) I also added ARP rod bolts and Supertech head studs. Hopefully addressing those two issues in the future.

My biggest issue with SC's was CIS - I like the instant start of the Motronic... The valve guides suck though - hopefully no need for those for awhile...

911 Rod 06-21-2006 07:52 AM

My theory on buying cars is usually buy the newest you can afford.
But, I'm not to interested in the non-torsion bar models.


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