Rebuilding 2.2 with S Pistons & S cams

[totle]

Hi,

Started to rebuild a 1971 911T engine 2,2.
It has been rebuild 5k Miles ago, I was told, but engine has been sitting in a 914-6 conversion for many years with no carburators, only towel to cover inlet.

I was told the engine was rebuilt by a former Vasek Polak employee of Hermosa Beach.

Engine had brand new clutch, flywheel and Pressure plate. All correct according to seller.

I have also verified that the 911T cams has been reground to S-Spec and no wear.
It has 2.2 S-Pistons and 84mm Nikasil Cylinders.

Serial number of engine: 6109506, 911/07

One (or actually 2) cylinders has been standing for some time with water in the cylinders.
One was not that bad, but the other cylinder has had the Nikasil plating come off.

I will need to get 1 new 84mm Nikasil Cyliner. Anyone that has one for sale, or know where I can buy one?

[totle]

some more pictures from teardown

[Henry Schmidt]

We can have a cylinder or two replated for you at a fairly reasonable price. Turnaround time is only a few weeks.

[totle]

Hi Henry,
Great to hear from you.
Please send me a quote pr cylinder. trondret at gmail . com
Thanks

[totle]

This is how P/C looks after a while with water inside.



I have read that piston squirters is mandatory when using Nikasil cylinders.

It does not look like this was upgraded to the engine case when rebuild.

I see that there can be cut a groove in the con rod, but would this be enough?

[911pcars]

Typically an S cam profile needs more lobe material to regrind than is offered by lower lift/lower duration T cams. It has been done, but only by reducing the base circle of the lobe. This changes the geometry between the cam lobe and its rocker arm - not recommended.

Sherwood

[Raceboy]

I see that there can be cut a groove in the con rod, but would this be enough?

This approach has been used on many manufacturers and engine builders and it works but I am not sure it is enough for 911 engine.
Should be good enough but perhaps others can chime in?

For comparison, here's photo of 924 rod, it has small hole in the rod (see the little bump with hole just above the big end:

Photo is from Dan's (ideola) website.

[pors1968]

90zn2 and the look of the piston might be wrong are they 2.7 RS p/c

[totle]

Cylinder is 84mm so not a 2.7

Piston stamped 84p8 w2, si I think this is 2,2s Pistons

[pors1968]

90zn2 is for 2.7 84p8+ is 2.2S piston

[totle]

Would not the 2.7 use 90mm cylinders?

[pors1968]

On your cylinder it should be writtin 84 ZD2 but picture that show 90ZN2 .

[tom1394racing]

The heads also appear to have the circumferential chamfer associated with the 2.7 90 mm cylinder. Looks like an interesting hybrid motor.

[Raceboy]

I wondered too about the 90ZN marking on the cylinder but the walls are thicker than on RS cylinder (I have a set of these) and 84P8+ is indeed 2.2 S piston (I have these also).

I wonder where these cylinder originate from? What does the spigot diameter measure? Is it 92mm or 97mm?

[pors1968]

It look they press a sleeve to put 84mm piston

[totle]

Looks like this guy has the same setup

http://www.914world.com/bbs2/index.php?showtopic=218533

[pors1968]

It a good and bad new these cylinders must rare to find.

[panama911]

Well... if it's true what is stated in post#13 of the thread you linked to above:

"Mahle for about 8yrs ? uses the 90mm casting and does the 84mm bore and they are Nikasyl coated inside" (914World.com - The fastest growing online 914 community!)
then that would be a plausible explanation.

But I don't know if it's true.

[pors1968]

But why take engine case have to bore at 90mm and have 84mm pistons .You can do samething whith 84mm barrel.Very curius about what is the + to do that.

[panama911]

So what is the spigot bore (the bore in the case)?
Is it 92mm or 97mm?