option for 2.0 engine rebuild

freezing14 · 08-22-2006, 05:35 AM

ok i am rebuilding my 69 911T engine ( actually 914-6) and I need to find a solution for the pistons, the cylinder are not bad but they will need to be bored, the pistion are ok but not that great, i see set of pistion and cylinder around,, in the book "911 engine rebuild" from wayne, it says that the 2.0 to 2.0 is a good choice but I should change the heads,, what is it going to do if i keep the 2.0 heads, i do not want to make a racer just a reliable driver and I want to keep cost down, what are the options?

thnaks

jluetjen · jluetjen's Garage

If you can find a set of usable 2.0E pistons, those will work great without changing anything else. You can even go with 2.0S pistons, but I'd want to use at least E cams to keep the static CR reasonable. If you can't find factory pistons, you can always go with JE's, especially if you have to go one size over due to reboring the cylinders.

freezing14 · 08-22-2006, 10:22 AM

that the whole point,, my cylinder are OOS" out of specification, so i need an over size with piston, ( about 1300$ just for the piston) then add 50$ for each to be rebored, or I have seen set of 2.2 new P&C for 700 but add 300 to have the heads fly cut and an other 100 for the head gaskets,

here is the real tricky question,, how will the engine be ( more/ less hp, more/ less torque, hot running? drivability\

if I go stock 2.0 case-crank-rod, 2.2 L P &C with stock 2.0 heads and T cam

shbop · 08-22-2006, 11:54 AM

If you have Biral cylinders, you could buy JE's at 81mm and bore your 80mm cylinders. I just did this to a 2.0, and so far I'm very pleased with the result.

freezing14 · 08-22-2006, 12:13 PM

how much for the set of JE pistons 81 mm,, it has to be less than 700 for the set to be worth while,,

shbop · 08-22-2006, 02:07 PM

Around $1000, but "worth while" is a relative term. You quoted $1300 just for pistons and another $50 a hole, for boring. You could buy the JE's, spend $300 for boring, and be at the cost of just pistons, in your previous post. Unless I'm missing something, which is entirely possible.

Henry Schmidt · Henry Schmidt's Garage

I know the cost may be higher than you were looking to spend but we have 86 mm Nikasil cylinders that will make your 2.0 into a 2.3. They are slip in and come with 8.5, 9.5 or 10.5 to 1 comp.
The cost is $2,340.00 but it is a nice slip in conversion.
I would recommend 2.2 heads but 2.0 heads can be modified for very little maney and you're good to go.

jluetjen · jluetjen's Garage

Quote:

Originally posted by freezing14

here is the real tricky question,, how will the engine be ( more/ less hp, more/ less torque, hot running? drivability\

if I go stock 2.0 case-crank-rod, 2.2 L P &C with stock 2.0 heads and T cam

Just extrapolating a few things...

1) You'll basically have a 2.2T. It will make more torque then a 2.0T for the simple reason that the engine is bigger.
2) The HP will be up a some from the 2.0T, but not greater then a stock 2.2T since the same port sizes were used for the 2.2T's as the 2.0's. So the port flow won't be limiting the engine compared to a 2.2T.
3) I'm guessing that the HP curve will be shifted down a smidjion from a "real" 2.2 since the 2.0T's had smaller valves, which will help low RPM turbulance and velocity, but make the engine feel like it has a little less cam in it.
4) Heat wise, I doubt that you'll be making more then 140 HP which is what a 2.0E made, so heat shouldn't be a issue without a fender cooler since 2.0E's didn't use oil coolers. I don't think that 2.2Ts did either for that matter.

Since you're going to be getting new pistons anyhow, I'd spec them with a 2.2E's CR rather then a 2.2T's. This will beef up the torque curve even further to make the engine even more flexible for around town street driving compared a 2.2T.

shbop · 08-22-2006, 08:01 PM

Ouch Henry! Now you got me thinking about another one. Oops, gotta go--- wife has ahold of my left earlobe........

freezing14 · 08-23-2006, 04:53 AM

dear jluetjen

that IS the eplanation I was looking for, great information,

in that case i will for sure go with the 2.2 and ask for the E piston. if I am not mistaking brigning the ratio up will only required premium gas??

is there going to be any valve clearance issue, I know that that the S cam with E or T piston will not work , the angle of the valve are different from the 2.2 head to the 2.0