Another 2.7 rebuild +ITB&EFI

[Neffets]

I haven't tried extending the 622 yet, but luckily my intakes are very good so I will only lap them
I had no idea this engine would take this many hours to complete... I'm used to working on 4-5cyl vw/audi engines, so when I started this I was planning to have the engine back in the car in a couple of weeks, yeah right

[Neffets]

While I'm waiting for my new valve guides I drew a cylinder holder tool you can make if you have a 3D printer

Porsche 911 cylinder holder tool by neffets - Thingiverse

[Clay.0]

Awesome project, any updates?

I'm looking into doing a similar ITB setup.

[Neffets]

just a quick update, cylinders have been nikasil plated and bored/honed to my dimmensions by US chrome, cost $189 per cyl, and are on their way back to me
I will post pictures and do a dimmension check and RA measurement when I get them

[ozracer]

Wow thats cheap what were they bored to we pay over 400 bucks here per cylinder there is only one place in the country that nikasils so we are stuffed.

[Neffets]

Got my cylinders today
I was suprised that there where no documention that verify they are made to my spec.
Anyway i will measure them tomorrow including the surface roughness RA.
DC-30 camshafts are in the mail as well

[Neffets]

I also got 1,5 spare 2.7 engine today, not sure what I'm gonna do with it, maybe i'll make a coffe table out of it...

[Clay.0]

Flat 6's make great tables. Keep up the good work.

[Neffets]

Can I stack the cylinder to case gaskets?
My stock was 0.25mm, I see from my notes I had to remove 0.4mm from the heads, so I should have a 0.65mm gasket. Or can I use the 0.5mm gasket?

[Neffets]

cams arrived today :




What goes where? Port and starboard?

[JmuRiz]

4 bearing cams in a 2.7?

[Neffets]

the 4th bearing will just spin in free air

[Neffets]

So finally I got 5 of 6 cylinder base gaskets....
Installed on p/c to find out that stock rod pins are to long for JE pistons, argh

[Neffets]

Forgot to update here
P/C installed with supertec headstuds

[Neffets]

Cam timing, took some time and some tries ended up with
cyl1-2-3 3.89mm
cyl4-5-6 3.81mm that was as close to 3.8mm I could get on the DC-30 camshafts

[Neffets]

The dial goes backwards from 0, so this is at 3.89mm



RSR rocker arm seals

[Neffets]

Made myself a camshaft tool

[Neffets]

So I bought the camshaft oil restrictors, and after reading much for/against I decided to drill it somewhere inbetween.
From left stock - drilled - restrictor

[Neffets]

Then I looked into the camshaft housing, and dooh there is a much smaller hole than the stock 6mm, I'll measure it tomorrow, but anything bigger than that up to stock hole is meaningless then...

I drilled mine 3.5mm, but if that is bigger than what's in the camshaft housing than it's the same if it's 3.5 or 6mm...

[911 tweaks]

u r correct on all that u say here...but... keep in mind the entire oil circuit when using the later "restricted/smaller hole" fitting has increased overall system oil pressure which is another gain from using the smaller hole fitting...the other gain - debated by many - when using the restricted/smaller hole fitting, less oil is on top of the motor = better oil scavenging by the oil pump as there is more oil down in the sump that can be scavenged & a bit less fluctuation in the qty of oil in the oil tank...