Scored a large displacement MFI setup

[Shuie]

If this is a dream, please don't wake me up

What do you guys think this was from originally?

Intake port orifice measures 39mm, the top of stacks are 43mm. Everything was covered in dust, but it cleaned up nicely. The pump turns over smoothly by hand and the throttle plates all move smoothly and freely.

I know that the '73S shared some part numbers with the 2.7 and 3.0 RS cars on the MFI setups. Is there anyway to tell if this came off of a 3.0 RS without disassembling the pump and looking at the spacecam? Can you guys tell from the serial numbers?

TIA

[Grady Clay]

WOW - Good for you!

In Bosch-speak 0408 126 019 is a '72-'73 2.7SC MFI Pump!

In Porsche-speak that is a 2.7RS. The Porsche part number is 911.110.254.00.

Judging by the casting date (51/72) and the serial number (32302158), I would speculate it is a '73 2.7 911RS. Someone with access to the numbers can confirm. I suppose it could be a 3.0.

Best,
Grady

[deoxford]

Holy **** Batman!!

[Fishcop]

Tell us the story then!

[Shuie]

Thanks everyone!

So the big question is, can I put this on my 3.2 without re-camming the pump?

Originally posted by Fishcop
Tell us the story then!

You guys would never believe me. This was luckier than finding my 3.2 Max Moritz motor. Oh well, I'll take luck anyday

[Cornpanzer]

Yes, lets hear the story!!

[Grady Clay]

Sherman,

I'm off to the Pelican Gathering of the Flock.

The answer is a qualified "yes." I'll e-mail you tomorrow.

I just think you saved this from a dumpster.

Best,
Grady

[Elombard]

Sweet, you realize you have to drill the heads to add MFI to a later motor.....

[Shuie]

thanks Grady, I appreciate the help.

[Shuie]

Originally posted by Elombard
Sweet, you realize you have to drill the heads to add MFI to a later motor.....

Yep, thats the easy part. The hard part is the stacks and throttle bodies. Im still struggling with the 4 bearing cam towers and cams, but I think im making it more difficult than it really is.

The only bad thing about this is that I already have a fresh set of stock smallport SC heads from EBS with all new valves, guides, springs, and retainers that do not have the right port size for the RS throttle bodies.

I didnt want to change anything too drastically on this motor since it ran very well with the small port heads, GE40 cams, and webers. I hope that going to the bigger ports, and MFI doesnt throw off what Ive been told was already a great motor.

[Shuie]

the port size thing is throwing me off

From BA's book, the port sizes
2.7RS 36mm
3.0RS 39mm

My throttle bodies are 39mm. Can someone confirm that this setup is NOT from a 3.0RS?

[randywebb]

I think you need a different (and probably custom) space cam - not an MFI expert tho.

[Elombard]

Oh thats right its running the pump from the cam that is tricky. Wasnt there a guy on the board who did this 3 or 4 years ago and sold the car?

[wot]

Hi

from this picture it looks like it is from a twin plug engine, RSR?

[Shuie]

The RSR had slide valves or high butterflys intakes. Its definitely not from a RSR. Everything Im reading and being told leads to a 2.7 RS.

I'd love for someone to confirm the port size for a 3.0RS is 39mm. I know Hans can figure out the spacecam issue if the pump will not work well as is on my 3.2, but Id really like to know that the stacks and throttle bodies were going to work so I can address my heads.

[jpnovak]

Very cool Sherman! If you can find the early SC (78/79) they will have a 39mm intake port. HMM if yours don't fit, they will fit mine.

That 3.2SS will rock with MFI!

[Shuie]

Thanks Jamie, thats what I was thinking.

Problem is that I just got my now basically 100% new set of small port heads back from EBS. Now they have to be tapped for MFI injectors and ported to 39mm on the intake side. It never ends

[Jim Garfield]

Great find Sherman! It's got to be a good story, c'mon.

[dd74]

Originally posted by Shuie
The only bad thing about this is that I already have a fresh set of stock smallport SC heads from EBS with all new valves, guides, springs, and retainers that do not have the right port size for the RS throttle bodies.

I didnt want to change anything too drastically on this motor since it ran very well with the small port heads, GE40 cams, and webers. I hope that going to the bigger ports, and MFI doesnt throw off what Ive been told was already a great motor.

Well, from what I know, the GE40 cams are pretty radical, so depending upon what your compression is (what is your compression?), you should have a lot more top end if you bore the heads. Torque loss on a little '72 should be neglible.

Wayne sells naked heads fairly reasonable. If you sell the fresh small port SC heads, you'd probably have enough $$ to put a dent in the cost of new heads which are bored out properly. But does anyone on this board want fresh small-port SC heads? Maybe if they're into keeping things stock - or are into torque more than top end power. So, in short, you might be stuck with boring the heads out anyway.

Whatever you do, don't get rid of that MFI...

[BURN-BROS]

Kudos Sherman, great find!