911 sc 3.6 to 3.8 engine rebuild thread

[-Levi-]

Originally Posted by Bill Verburg

Any progress?

Not much to update, waiting on some wiring harness pieces. My mechanic is going to install a connector in the main harness to separate the harness without disconnecting everything on the engine or body side of the car.
The body harness, wideband 02 sensors and the exhaust cutoff wiring has all been routed through the tunnel.

[Bill Verburg]

Originally Posted by -Levi-

Not much to update, waiting on some wiring harness pieces. My mechanic is going to install a connector in the main harness to separate the harness without disconnecting everything on the engine or body side of the car.
The body harness, wideband 02 sensors and the exhaust cutoff wiring has all been routed through the tunnel.

so the harness is in the tunnel?

usually that big hole in the bilk head to the right of the harness is where it would come through

can't wait to see it installed

I've started collecting the pieces to mount mine like that
got the 3.2 console

will use the Sheridan f/g tin replacements

debating whether to go for a Ti or SS cross bar, I like the Rennline version because of the boxed ends but Ti would be nice too

[-Levi-]

Originally Posted by Bill Verburg

so the harness is in the tunnel?

usually that big hole in the bilk head to the right of the harness is where it would come through

I've started collecting the pieces to mount mine like that
got the 3.2 console

will use the Sheridan f/g tin replacements

debating whether to go for a Ti or SS cross bar, I like the Rennline version because of the boxed ends but Ti would be nice too

Yep, the harness will still go there, just simplified and cleaned up.
I would like to do a different cross bar, I dislike the one I currently have, I just don’t really know wha5 will bolt on vs having to make something.


The Sheridan parts look even better in
Person, I highly recommend them.

I have no before pics, but the old harness was a hack job, chaotically finished in green electrical tape. This setup is so much cleaner with a main harness quick release.

[-Levi-]

Work has been hectic, but I was able to get a free day to start the install. Got a bunch of odds & ends finished up, and the engine is now mounted. I need a few more hours before we are ready to fire but we are getting close

[Bill Verburg]

I'm going to pull mine this week to correct a few other issues and replace the tin w/ Sheridan f/g, also bought a Rennline cross bar & mounts

[Bill Verburg]

Shorter studs are needed for the 3.2 console vs the 3.6 version

[Bill Verburg]

Engine is back in the 99 3nvr fits like a glove

Heat needs to be re imagined though

[pocv0]

Bill, where did you get that crank pulley ? I need one...

BTW- looks great.

[Bill Verburg]

Originally Posted by pocv0

Bill, where did you get that crank pulley ? I need one...

BTW- looks great.

It is a 993 RS single sheave
part #s are
993-106-051-80 impeller hub for the alternator
993-102-050-40 pulley for the crankshaft

[-Levi-]

Got the car started over the weekend
Exhaust was on quiet mode and the fan needed adjustment in the first video.

https://youtube.com/shorts/0eUl2jDfAyM?si=BgfGs_K991Aupg8R
https://youtube.com/shorts/htasQ4l5LP8?feature=shared

[bighead]

Originally Posted by -Levi-

Got the car started over the weekend
Exhaust was on quiet mode and the fan needed adjustment in the first video.

https://youtube.com/shorts/0eUl2jDfAyM?si=BgfGs_K991Aupg8R
https://youtube.com/shorts/htasQ4l5LP8?feature=shared

I'm enjoying following your build, and you are inspiring me to do a 3.6 swap into my 911SC. I have found a US Spec 993 3.6 VRAM, but worried about the pain I've heard the OBD2 system causes. Any words of wisdom or recommendations on how you dealt with the OBD2 system? Thanks

[Bill Verburg]

Originally Posted by -Levi-

Hey Bill!!
I wish I had more input for you. The engine mount came with the engine when I bought it years ago, at the time it bolted up so I didn’t give it much thought. I’m not a big fam of how my setup looks and I’m considering replacing it with something else.
Can I sent you an in depth video next time I’m around the engine so you can get a better view of it? Maybe some extra pictures?

After looking at these things for the past 2 years , I Think that you are using the 993 console and crossbar

Sheridan told me emphatically that his f/g wouldn't work w/ that combo but you prove him mistaken

The f/g must allow the engine to sit higher than mine w/ the 3.6 tin did

after replacing the 3.6 console and cross bar w/ 3.2 version the engine sits where a 911 engine should, the rubber along the sides seals and more importantly the exhaust is tucked up where it should be

I'm pretty sure the these are the pieces you have




these are the pieces I used


down side is
1) I had to redo the heat, not an issue on yours
2) the stock air cleaner box just won't fit so I went back to the cone I used a few years ago.

[-Levi-]

Originally Posted by bighead

I'm enjoying following your build, and you are inspiring me to do a 3.6 swap into my 911SC. I have found a US Spec 993 3.6 VRAM, but worried about the pain I've heard the OBD2 system causes. Any words of wisdom or recommendations on how you dealt with the OBD2 system? Thanks

That’s awesome!!! The 3.6 is a nice upgrade on the older cars.
I had the same concerns as you and decided to go with the 95 obd1 engine and retrofitted the VRam intake after the fact. I think the later cars can be done, but I didn’t want that extra challenge.

[bighead]

Originally Posted by -Levi-

Yep, the harness will still go there, just simplified and cleaned up.
I would like to do a different cross bar, I dislike the one I currently have, I just don’t really know wha5 will bolt on vs having to make something.


The Sheridan parts look even better in
Person, I highly recommend them.

I have no before pics, but the old harness was a hack job, chaotically finished in green electrical tape. This setup is so much cleaner with a main harness quick release.

Who made your wiring harness? Mine is all hacked up, so I need a clean one like you have.

[-Levi-]

Originally Posted by bighead

Who made your wiring harness? Mine is all hacked up, so I need a clean one like you have.

Same person that did my engine. That said, for the cost it's probably worth the extra cost to just have a mil-spec harness made.

[bighead]

Originally Posted by -Levi-

Same person that did my engine. That said, for the cost it's probably worth the extra cost to just have a mil-spec harness made.

Happen to know of anyone making mil spec harnesses for a 3.6 to SC swap?

[-Levi-]

Originally Posted by bighead

Happen to know of anyone making mil spec harnesses for a 3.6 to SC swap?

Rasant and Ry-wire should be able to help.

[-Levi-]

Well, i finally made it through the break in miles and got to do a few pulls on the Dyno.
Here are the baseline pulls with a few things to note.
- I have a fuel cutoff from the SWchip at 6,200 RPM, I may be able to squeeze a bit more going up to the factory 6,800-7,000 redline
- it looks like my AFRs are a bit on the lean side and that will need to be adjusted for safety, maybe HP?
- I'm in Colorado at 5,280 ft elevation (i don't know if that really changes anything?)
- The last pull (in orange) was with the "quiet" mode selected on the GT3 muffler. I was expecting a bit more loss there.

i assume with some changes to the chip and AFRs i should be able to get a few spare ponies out of the car. at 268 Wheel Horsepower i assume I'm making around 310 crank, which puts me in the range of what i would say is reasonable.

Here is the build.
Mahle 3.8 liter piston and cylinder 11.4:1 compression
993 RS Intake Valves
993 RS Exhaust Valves
Light Port and Polish
Pauter Lightweight Connecting Rods
AASCO Titanium valve springs retainers
AASCO Titanium Retainers
AASCO Titanium Keepers
FVD Mechanical Rocker Arm Conversion
FVD Sport Cams for Mechanical Rocker Arms
Fabspeed Carrera Cup Intake
S-Car-GO 1 7/8 Headers
Gt3 muffler (top and bottom feed)
Steve Wong Chip
Arp hardware
Patrick Motorsports Light Flywheel
Patrick Motorsports 3.6 conversion Clutch
Rothsport Single Belt pulley


Any thoughts or feedback?



DYNO VIDEO
https://youtu.be/ikdKA20s9oM?si=O4aztkx34I4ATpbL

[PeteKz]

Since you are in Colorado, did the dyno operator correct for altitude? Typically a non-boosted engine loses about 3% HP per 1000ft, thus you would be down about 15% compared to sea level. If those were not corrected for altitude, then you have even more power at lower altitude than you measured.

[winders]

For the SAE correction, the Dynojet software corrects to 77 degrees F, 29.23 inhg and 0% humidity. At least they used to do that.

Also, I believe that dyno sheet is stating it is using SAE correction and that the correction factor used on the raw data is 1.19. So that 267.42 HP pull measured at 224.72 HP.