MFI throttle body

[bob thibodeuax]

Gentlemen I greatly appreciate all info included in this forum. I have been refurbishing a 1972 911 E. I was putting the throttle body back on and discovered that one of the tabs to screw body down is broken. This is the body that has the butterfly's. The body is made of a plastic material. My question is can this be fixed and by who? Thanks for your input

[76_rookie]

I've got a set for sale. Interested?

[bob thibodeuax]

All I need is one side. How much?

[jbell959]

Can you post a picture? Not clear if you are describing the throttle body or intake stack.

[91133]

Sounds like the velocity stacks. You could try the local PU bumper welding/repair guys. Just don't use the 'Porsche' word...they may do it for free. I had one repaired like that some years ago.

[bob thibodeuax]

No, it is not the velocity stacks, but the body throttle body the holds the butterfly valves. I. Will try and post pics tomorrow.

[Flieger]

If they are plastic throttle bodies they are not from a Porsche. The throttle bodies with the butterflies in them are Magnesium. The velocity stacks were done in both Magnesium and in plastic.

[Dodge Man]

QUOTE: Flieger If they are plastic throttle bodies they are not from a Porsche. The throttle bodies with the butterflies in them are Magnesium. The velocity stacks were done in both Magnesium and in plastic.

Go to someone who builds & tunes MFI for a living to get advice not the posters!!! Go to an MFI shop or someone like Mark who runs outlaw racing MFI motors out of his shop so they may be able to actually help you with your issue. Mark actually runs some built late model motors with MFI(not easy to tune). Racers generally know how to fix things. Mark's biz is MFI so check the posts for feedback. I ran MFI for some years so I know it is not a picnic of instant opinions/posts. Better research = better results. Good luck.

Mark Jung
Seal Rock, OR
mfiwerks.com

[Flieger]

Maybe some aftermarket company has made plastic throttle bodies but unless they are carbon fiber reinforced plastic I wouldn't want them. The Magnesium ones wear out bad enough.

[Porboynz]

Originally Posted by Dodge Man

QUOTE: Flieger If they are plastic throttle bodies they are not from a Porsche. The throttle bodies with the butterflies in them are Magnesium. The velocity stacks were done in both Magnesium and in plastic.

Go to someone who builds & tunes MFI for a living to get advice not the posters!!! Go to an MFI shop or someone like Mark who runs outlaw racing MFI motors out of his shop so they may be able to actually help you with your issue. Mark actually runs some built late model motors with MFI(not easy to tune). Racers generally know how to fix things. Mark's biz is MFI so check the posts for feedback. I ran MFI for some years so I know it is not a picnic of instant opinions/posts. Better research = better results. Good luck.

Mark Jung
Seal Rock, OR
mfiwerks.com

Aha, free advice being offered, or maybe not. The throttle body screw adjusters often do break as you get a electrochemical reaction between the steel adjuster screws and the magnesium body material. You need to be uber careful to release the lock nut and then if the screw is frozen work very carefully to loosen the screw using heat and the usual methods to avoid a broken housing. I tried a dental compound to repair one broken adjuster mount but it broke after about 6 months so I ended up with new/old throttle bodies. Maybe a skilled welder could work with the magnesium, but if the throttle body butterfly spindles are worn as well then good replacements are a better option. Good luck with that.

[RSTarga]

if these guys can't help you no one can.

Eurometrix Porsche Carburetor MFI Remanufacturing

[Dodge Man]

Originally Posted by RSTarga

if these guys can't help you no one can.

Eurometrix Porsche Carburetor MFI Remanufacturing

Nice reference. I asked my canyon runner buddy that does freelance restoration work and there are some old school restoration shops that can fix the broken bolt ears but most of them do it for restoration projects only and do not advertise. Maybe some other people can also post references to MFI shops to give you some more choices to evaluate.

[bob thibodeuax]

Thanks for info and suggestions on my problem. After further checking the body is Magnesium, so I decided to just order a used body instead of repairing.

[Flieger]

Originally Posted by bob thibodeuax

Thanks for info and suggestions on my problem. After further checking the body is Magnesium, so I decided to just order a used body instead of repairing.

Magnesium can definitely be repaired. Perhaps you can exchange your cores for a new rebuilt setup from Eurometrix? (They are the guys I think of first when I think MFI throttle bodies. Mark Jung is great for the MFI pumps).

[Dodge Man]

Originally Posted by bob thibodeuax

Thanks for info and suggestions on my problem. After further checking the body is Magnesium, so I decided to just order a used body instead of repairing.

Just hang onto the old one. Todays trash is tomorrows treasure. I let go of my old 2.4 MFI motor years ago and now it is worth a lot more than the $500 I got 30 years ago.