1967 Restoration. Need engine advice!

[The Greek]

So I randomly came across a rare matching numbers 1967 911 that the COA says is Black, which is my dream. So with the help of a friend and his shop, I decided to take the plunge into restoring the car to its factory color. But pertaining to the motor, I need your guys advice. I cant decide which direction to go....

So here are the facts, I sold a 1972 911 with a MFI 2.7 motor that put out 206 rwhp. Car was a blast to drive. So i had that experience with a longstroke 2.7 motor. Now with this build, I want to do something different. Have always dreamed of a wicked 2.5 short stroke that revs to 8k. For me, I already have a 997.2 RS and a 964, so my priority is more visceral feel and experience rather than pure speed.

I have the matching case that needs some machine work, but I also have a spare 67 case that I could hot rod. What i am worried about is building a motor that is not balanced with the chassis, or is just too much power for it, where I cant have fun carving canyons because I am feathering the throttle all the time. There is something to be said about having a blast going WOT with a 2.4 through the canyons. So much fun. Car will have updated suspension with sway bars and upgraded brakes, but nothing too crazy. Just a nice strong street setup. 21/26 torsion bars. Tires will be 185 Avons all around with steelies.

Here are the ideas of possible engine ideas

- 2.5 Short Stroke (220-250 hp) Shelve matching numbers case, and use spare case to build the hotrod motor. I have been told its a great motor, but lacks a lot of grunt midrange. Do short gearing 2-4 and lsd to maximize the power band.

- 2.8 Short Stroke (280-300hp) Have been told the price to build a 2.8 over a 2.5 is negligible, and with the 2.8 you get the midrange torque while having it scream up top. Henry from Supertec refers to it as the ultimate Porsche motor. But I am concerned its too much for the chassis, and the 185 AVON's all around. Do short gearing 2-4 and lsd to maximize the power band. But also not sure if 901 transmission can handle power reliably.

- 2.45 Long Stroke - Shelve matching case, use spare case to use a longstroke crank and rods, and built a nice fun street motor that revs to 7000. Simple and fun. Do short gearing 2-4 and lsd to maximize the power band.

- 2.2 Short stroke - Use matching numbers case to build a nice short stroke. Take a deep breath from the monster motor build ideas. Do short gearing 2-4 and lsd to maximize the power band. Something kind of cool about a nice clean SWB hot rod running around with a matching numbers case

[The Greek]

Anyone? lol : )

[darrin]

seems the limiting factor's going to be the 901 transmission, see 901 vs 915 gearbox & a short stroke 3.2

Perhaps shoot for a power to weight ratio similar to the original 911r?

[gomezoneill]

The more power the better.

[Gus Berges]

You said it yourself you always dreamed of a 2.5 short stroke.... It is one of the options you list...

Assuming the 901 will handle it, you can play with gearing and weight saving/adding measures to balance the car to your liking.

[1QuickS]

I had Ed Mayo build a 2.3 liter for my 67 911S hotrod. Twin-plugged with 2.2 heads. Chassis weighed 2100lbs wet and power from engine was right at 210 HP. Plenty quick enough and every run through the gears lasted long enough to thoroughly enjoy.

901 box is fine for this as long as you don’t want to lay rubber in first. The 911R used a 901 box when it ran 96 hours at Monza in early 1968 averaging 130 MPH including time spent replacing front suspension.

I can supply build details if requested.

[Flat6pac]

With power and the weakness of low gear, find a 4 speed so all the power stays on the main shaft
Bruce

[1QuickS]

Yes, light car doesn’t need 1st unless you want to drive up incline from a stop.

[Hi_Fi_Guy]

I vote 2.2 or 2.5. Either would be a blast in this car... especially since you have other, more modern, go-fast cars when needed.

[The Greek]

Originally Posted by Gus Berges

You said it yourself you always dreamed of a 2.5 short stroke.... It is one of the options you list...

Assuming the 901 will handle it, you can play with gearing and weight saving/adding measures to balance the car to your liking.

I believe the 901 will handle the power of 2.5. I know torque is subjective so I guess I was wondering how weak the power curve was below 5500. For me driving around town, I was fine with how the 2.0 midrange was on the stock motor. But then you hear people saying how much a dog the 2.5 is and how a 2.8ss is the ultimate motor.

Originally Posted by 1QuickS

I had Ed Mayo build a 2.3 liter for my 67 911S hotrod. Twin-plugged with 2.2 heads. Chassis weighed 2100lbs wet and power from engine was right at 210 HP. Plenty quick enough and every run through the gears lasted long enough to thoroughly enjoy.

901 box is fine for this as long as you don’t want to lay rubber in first. The 911R used a 901 box when it ran 96 hours at Monza in early 1968 averaging 130 MPH including time spent replacing front suspension.

I can supply build details if requested.

Dude, if you could that would be awesome! Can you email me to npappas2@yahoo.com?

Originally Posted by Hi_Fi_Guy

I vote 2.2 or 2.5. Either would be a blast in this car... especially since you have other, more modern, go-fast cars when needed.

Yea, that is what my gut is telling me. I cant imagine a closed geared 2.5ss that revs to 8k being boring. It has to be badass

[1QuickS]

Cable for internet is down so I can’t send info now. I sold my car on BAT about four years ago. Search for “Modified 1967 Porsche 911S” for some info. I also have a YouTube in-car video that provides an idea of what it’s like to drive a hot 2.3 in a lightweight SWB.

The 2.3 with Webers was originally used in 911STs. With S-cams (GE-40) torque peaks at 6600 RPM and HP is about 210. GE-60 cams will produce about 230 HP at 7000 RPM and GE-80 cams allow even more with a 8000 RPM redline.

Contact me via email provided on my website “PerformanceOriented.com”