Otto's Rebuild

[purplehaze]

Congratulations, Otto!

Sounds great, and it FEELS great to have it done, doesn't it?

[otto in norway]

Thanks!
You bet! -Don't need to call Dr. Feelgood, I got just the cure...

[sabeo.m]

Beautiful 911! Sounds awesome, congratulations!!

[Britwrench]

Well done.
You need to replace the nyloc nuts on the exhaust and replace with correct metaloc or plain steel nuts.

[911 tweaks]

Also... Great job here Otto !!! what muffler are you using ?? It sounds like a M&K possibly ??
Please summarize what the final specs of your engine are and what you started with. Any testing as to hp ~ torque it is at now ??
Also, please update every time something arises and/or 1x/month so we all can learn the + and - of things you did.
Again, great job and thanks for sharing your build with us !!!
Bob

[otto in norway]

Thanks guys!
I started with a stock 3 liter engine, with 8,5:1 copression ratio. My plan was to simply bump up the compression ratio by putting in some 9,5:1 JE pistons. But this was not to be, because my cylinders was alusil alloy. I therefore bought a entire P/C set from Mahle. Still 3 liter, and with 9,8:1 comp ratio.

The engine was fitted with a sport muffler before I started. I don't know the brand, but it's heavy, stainless steel. And it's LOUD. (And yes, I've used the proper hardware for attaching it.)

This is a summary of what I did, aside from the new P/C set:

-replaced the cams for "964" profile cams (Increase HP)
-replaced cylinderbolts for aftermarket ones
-replaced cat for a pre-muffler from fabspeed (Increase HP)
-mounted an aftermarket oil cooler in front to keep it cool on the track.
-Installed oil preassure fed tensioners.
-Heads done at machine shop.

Of course all gaskets, bearings and also the shafts for the rockers was replaced.

So this is not the cheap way to go... But you can use your cylinders if you have Nicasil alloy. And you can keep the cooling system. (My oil line was old and worn , with some restrictions in the lines)

I have not broken it in yet, but I can allready feel it's "stronger" than before. I do not intend to rev it fully until the next oil change... But I'll update when I get there.

Sadly, the winter is coming soon, so I might not be able to complete the break-in before I have to store it for the winter...

Oh... I dont't know the brand of my muffler, but maybe some of you recognize it?

[otto in norway]

Now, that I'm finished rebuilding, I got bored, and made a video of the project...
Not very good, but a summary of the ordeal..

http://www.youtube.com/watch?v=PsYAFJVJtxE

[purplehaze]

VERY nice clip Otto!

It captures the spirit of doing one of these beasts oneself. Truly a celebration when you get it all back together and it runs.

[sp_cs]

Muffler looks and sounds very similary to my DP Motorsport item. Agree on heavy, circa 13kg, but the sound is like nothing i've heard from other manufacturers, especially with a bypass pipe

[otto in norway]

Thanks mate!
That's got to be it! I got it with the car when I bought it. The guy that sold it to me said it costs something like $2500.... (I'm sure he was lying, because he was lying about a lot of stuff. He actually advertized it as a Carrera)
Anyway, sounds good, and looks good!!!

[sp_cs]

No problem - you should have a small rectangular 'DP' badge on it somewhere.

Oh, he wasn't joking about the price - around 1200Euro!

http://www.dp-motorsport.de/uploads/tx_dpproducts/911_G-Model_equipment.pdf

[otto in norway]

Got some concrete results now.
I have wondered about the horsepower increase with my mods...
Well I don't know that, but I DO know is this:

0-60 time has improved by 0,4 secs. (From 5,8 to 5,4) -And I guess that's what I was shooting for! (And not bad for a 79 SC)

[Gary.H]

Hi Otto,

Did you ever get any dyno plots for your rebuild?

Cheers - Gary

[otto in norway]

No dyno results yet.
The engine is out once again, because I am going to do a job on the tranny.
I'll probably get some dyno results this summer. But maybe, just maybe, I'll install a EFI system first. (Economy will decide)

Gary: Impressive results on your engine , by the way! Are you running it on CIS?

Engine out. -Again:

[Gary.H]

Originally Posted by otto in norway

No dyno results yet.
Gary: Impressive results on your engine , by the way! Are you running it on CIS?

Yes Otto, running on CIS. Be more impressive if I could regain that mid-range torque though

[87 clubsport]

Hey Ottto good job I will start to rebuild my engine on Sat Valt. day wife may piss, just want to know what kind of paint (red) on your engine cover? thanks Steve

[otto in norway]

Hey there

I used a normal car spraypaint. Seems to do the trick.