1969 911S MFI - mag stacks, throttle bodies and 001 pump

[kenikh]

SOLD

For sale is a complete 1969S MFI. Condition is as follows:

Most throttle shafts have no play; a couple have minimal play. I would be comfortable running these as-is.

Action on the butterflies and links is crisp and snap back quickly.

Intake horns are the correct 'S' items; 2 are from another set and were painted at some point in their lives. These were the best six I have.

The MFI pump rotates smoothly and is capped off for storage, but I have no indicator as to when it last ran (or if it ran at all).

MFI pump part number on tab is slightly damaged and hard to read; I have confirmed from my other 001 pumps and the other ID tags on the pump bodies that this one is indeed a 001 pump.

All part numbers correctly correspond to a 1969 911S.

Asking price $1950 + shipping.

I am also happy to coordinate sending these to any refurbishment shop in the USA, should you desire restoration.

Thanks.

[kenikh]

[budge96]

Kenihk , interested ...could you tell me off hand other than the part numbers
what are the differences between these and say 70-71S ?
I don't have the spec book handy..Bert

[kenikh]

No differences that I know of. Same specs for all 'S' and 'RS' other than mag ('69-'71) vs. plastic stacks ('72/'73).

[Scott Clarke]

I think that there are subtle differences. The stacks are larger diameter at the top, but taper to the same diameter at the throttle bodies. The throttle body/stack interface is also different, so they are not interchangable from '69to '70-'71. The pump is also different, and the space cams are not interchangable with those from latter systems. All that said, I think you could use the system on a later car. I asked Matt Blast about the difference in stacks, and he seemed to think that the change didn't affect performance on way or the other. I wondered why they bothered to change?

[kenikh]

Great info. I tired to dig this info up, but couldn't find it anywhere on Pelican. Had trouble finding he part numbers for comparison, too.

[Scott Clarke]

There is a thread somewhere on Pelican that lists all of the dimensional information for the various systems. It is worth finding. Try a search under "MFI Stack Dimensions." The space cam info came from a conversation with Gus Phister.

[kenikh]

KAPOW: http://forums.pelicanparts.com/showt...ack+Dimensions

I thought since the topic comes up once in a while that I would post the dimensions of the various MFI setups for the data base.

I measured all the the induction setups with the exception of the 72/73' S/RS setup stacks which I did not have available to measure. My guess is that they are they have the same inner dimensions as 70/71' S stacks.

The stacks were made of magnesium until 72' when they started making them out of plastic.

The 69' magnesium stacks had the same outer dia. on the E and S stacks. The inner bore is what is different. Same is true of the 70/71 mag stacks.


Outer diameters of the mag stacks:

69'

E & S

55mm at the top
47mm at the bottom

70/71'

E & S

55mmm at the top
52mm at the bottom


If you use the 69' stack as the limit for wall thickness. (about 4.5mm) then you can see that the 70/71 mag stacks, E or S can be bored out to be 46mm at the top and 43mm at the bottom. This is what makes them good candidates for large displacement motors. Of course, special throttle bodies would need to be built in this scenerio. i.e larger than 38mm.

The outer and inner dia. are different on all three ver. (T,E&S) of the plastic stacks. The angle of the stack varies as well. This makes the E plastic and especially the T plastic stacks not very useful for modifying for larger ports and cams. Either find the S stacks or get some mag stacks to use. Remember, the 69' stacks won't fit the later TBs' so you'll have to buy those as well.

The throttle bodies in 69' had a stud spacing of 66mm. From 70' on they used a spacing of 72mm. Therefore throttle bodies and stacks can't be interchanged between 69' and the later years. From 70' on they are interchangeable. i.e. You could put a 70/71 E or S stack on a 73' T throttle body if you wanted to.

As you will see in the chart. All the throttle bodies start with a 38mm bore and taper to their respective cylinder port. Therefore you could bore the bottom of a T throttle body from 29mm to 36mm and use it for a 3.0RS if you chose to do so.


In the chart below you see the numbers 1 thru 5. These correspond to the inner diameters accordingly.

1. Top opening of stack
2. Bottom opening of stack
3. Top opening of throttle body
4. Bottom opening of throttle body
5. Cylinder intake port.

This shows the flow pattern going down into the cylinder.

Year..69'.......70/71'.....72/73'

T

1.......n/a........n/a......35mm
2.......n/a........n/a......32mm
3.......n/a........n/a......38mm
4.......n/a........n/a......29mm
5.......n/a........n/a......29mm

E

1.......39mm....38mm....38mm
2.......35mm....35mm....35mm
3.......38mm....38mm....38mm
4.......32mm....32mm....32mm
5.......32mm....32mm....32mm

S

1.......46mm....42mm
2.......38mm....38mm
3.......38mm....38mm....38mm
4.......36mm....36mm....36mm
5.......36mm....36mm....36mm


2.4S, 2.7RS and 3.0RS all use the same MFI setup. The only difference is the space cam used on the 2.4 motors. The 3.0RS setup is identical to the 2.7RS

[budge96]

Bobboloo that info is invaluable, the important fact to me is the stud spacing..
hoping one of our members will see there way clear to sell thier '70 set up
thanks Bert

[kenikh]

FWIW, the '69 set up will work on any car. The stud spacing is simply for the mating from TB to stack.