911E Engine Rebuild

[DAVIDEDOO]

I can't find 2.0L pistons and cylinders for my 1969 911E has anyone got a source. Has anyone up graded to a 2.7L without major changes to the rest of the engine. Currently, it still has the stock MFI.

[rvanderpyl]

I assume you called Pelican for the Pistons/Cylinders?

Upgrading to a 2.7 IS a major change, it requires new Pistons/Cylinders, crankshaft, connecting rods, and machine work on the case. You can create a 2.5 by using the 2.7 P/C with your current crank and rods, but you will still need machine work on the cases to open up the spigot sizes.

And you can't use your MFI unless you have the pump rebuilt to match the new engine, that's an expensive item.

[DAVIDEDOO]

Originally posted by DAVIDEDOO
I can't find 2.0L pistons and cylinders for my 1969 911E has anyone got a source. Has anyone up graded to a 2.7L without major changes to the rest of the engine. Currently, it still has the stock MFI.

I am sending the pump to Fairchild in Redding Ca. to be rebuilt. I am probably looking at new heads with bigger valves too, right.
My problem is that there is to much gap between the piston rings and the groove in the piston allowing oil to pump in to the combustion chamber. I have been told someone had the groove machined to accept a wider ring does this sound possible?

[Rot 911]

What are wrong with these from Pelican Parts: Piston/Cylinder Set, 1969, 911E 2.0L, (140HP) Part number: A-103-909-05; price $1817.20 (ouch!) http://www.pelicanparts.com/catalog/shopcart/911E/por_911E_piston_main.htm

[BK911]

Let's see if this works:

Machining piston ring groove

[Carrera Charlie]

Check your private mail. I have a possible solution for your pistons.

Cheers,

[jluetjen]

You might want try a variant of an old upgrade: get yourself some high compression (~9.8 or 9.9:1) pistons and put the rest back together. This equates to using 2.0S pistons which is what I have in my car. This was a very popular upgrade back in the 70's. Getting fuel shouldn't be an issue if you can get 93 octain in your area.

While the 2.0S pistons are cool, they do cost a lot of money. I'd check JE's pistons out to see how their offering compares for price etc. (Curiously, I don't see any Porsche pistons listed in their catelogs)

I have 2.0S pistons in my 2.0E and in a back to back drive with a 3.2 Carrera, I was hard pressed to feel any slower in the 2.0. Having a big passenger in the car will have a bigger impact on the power to weight ratio in my 2.0 then with a bigger engine, but I usually drive in my car by myself or with one of my preschool daughters. (My wife doesn't care much for the 911 experience ). Anyway, my car is stock except for an MSD ignition which really helps to smooth out the idle and sub-3000 RPM running where the 2.0E's and S's will often buck and mis-fire. I'm still using the stock space cam in the MFI and I was able to adjust the idle and part-throttle settings to make the engine happy.

Unless you are going to be running a lot in the in 6500 RPM and greater range (for example vintage racing), I don't think that bigger valves and porting the heads will net you much. The intake gas speeds for the 2.0E are pretty normal for the 911 motor (89 m/s versus a range of 75-100 m/s on other 911's), so bigger ports and valves will only lower the intake gas speed which increases the likelyhood of the low RPM power suffering.

[Rot 911]

Hey David, check out this 2.0 engine that is for sale: 2.0E engine