1966 2.0 vs 1969T 2.0 HP difference

[Jayboundless]

So I have a question: Spec sheets show the early cars 1965-1968 base models 2.0 as having 130hp. I have a 1969T 2.0 but it only has 110hp. They appear to have the same bore and stroke so what are the differences that would give those more hp? I,m speaking about the base engines not "E" or "S" models.

[Matt Monson]

Compression ratio and cam grind. And valve and head port size differences.

[bgyglfr]

Swb 911 normal is equivalent to a 69 911E. It was the mid level car. 65/67 had solex cams and 68 normal was basically a E cam grind. That and more compression and there's your 20hp.

[304065]

64-66 had solex grind, cams changed in 67 with 901/06

see here op Suggestions for warmed over 2.0 901/05?

[Hotrod911T]

One of the reasons the '69T (and 914-6) engines had the least amount of horsepower of all the 911 engines is that to meet USA smog requirements the Webers were choked down with 27mm venturis. The first things I did when I got my '69T back in 1974 was to put in 30mm venturis, change the carb jetting and install a CD ignition system. Those modifications alone probably picked up 15-20 hp.

Rod

[Jayboundless]

Interesting Rod. My eventual plan was to upgrade the C&P to a larger bore and switch to E cams. Is this a Carb modification I'd make anyways?

[Hotrod911T]

Jay,

Whatever you do, you would need to modify the stock Weber 40IDT3C carbs because they are so restrictive even for a 2.0 liter engine. I eventually upgraded my '69T with 2.2S p/c's and '67S cams, '67S distributor and went to even larger 32mm venturis. It was my DD for 25 years.

About 15 years ago I built a 2.7 with 46 PMO's out of a '66 aluminum 2.0 case for the car and now it has a 3.2SS race motor with a 915 trans.

Rod

p.s. By the way, how is Omaha these days? I graduated from Bellevue HS (now Bellevue East). The main thing I can recall about starting to drive when I was young and restless in Omaha is that there seemed to be a lot of one way streets, but I haven't been back in Nebraska for a long long time.

[Daves911L]

Originally Posted by Hotrod911T

One of the reasons the '69T (and 914-6) engines had the least amount of horsepower of all the 911 engines is that to meet USA smog requirements the Webers were choked down with 27mm venturis. The first things I did when I got my '69T back in 1974 was to put in 30mm venturis, change the carb jetting and install a CD ignition system. Those modifications alone probably picked up 15-20 hp.

Rod

Rumor had it that the 27 mm venturies (and the restrictor rings in the exhaust) were a nod to the marketing dept. to differentiate the "cheap" model with a bigger horsepower gap. Back in the day Stoddard sold a kit of 30mm venturis and associated jets to get 911Ts breathing properly.

[Jayboundless]

Ok. Good to know. I've just started researching the options for upgrading my 2.0L. It appears there are a few:
- Boring the cylinders for larger pistons, with "E" cam upgrade to 2.2
- upgrading P&C's and cams with "S" parts as you described to 2.2 "S" specs
- just stroking the engine with 2.4 crank and rods.

More research on my part is much needed before I commence the upgrade. decisions, decisions...

Omaha is good (although I always wish I was somewhere else!). I don't know how long ago you were here, but it has changed and grown quite a bit. I'm born and raised and relatively young (46), and I remember when 120th was farm ground. Now the city stretches to Elkhorn to south past Bellevue.

[Jayboundless]

Oh yeah, and I found this little gem yesterday while checking for specs to upgrade the dizzy with a Pertronix electronic ignition. I guess this one is quite rare and sought after.

[Hotrod911T]

Jay,

I have a '67S distributor like yours with a Pertronix ignition unit that I took out of my 2.7 before I got rid of it. I also have the relatively unused original '69T Marelli distributor with an extra cap and rotor, now that is really becoming rare. When I built the 3.2SS the '67S distributor wouldn't fit the case so I had to use a 2.4 RS distributor with a custom curve. The '67S is a great distributor in stock form and even better with an electron ignition in it.

[Hotrod911T]

Dave,

I know what you are saying about Porsche detuning the '69T engine. It only had 20 hp more than a 912 and the the 912's were better handling cars being lighter and with a better weight distribution. I used to time trial the '69T with POC/PCA and felt like being a moving chicane for all the faster cars. I'd rather switch than fight, so it wasn't long before I got a '67 911S for the track. Now that was a car. PCA kept bumping the '67S up in class to eventually we had to run against the (then new) 911SC's.

[Jayboundless]

Rod, There are a couple of Pertronix ignition sets available but neither list the 67s dizzy for use. Do you recall which part number you used?

Thanks in advance!

[Hotrod911T]

Jay, there is a Pertronix unit specifically made for a '67S distributor, and it is part# 1866.

Rod