old cylindrical mounts for the airbox standoffs seem to be
a common problem on 928's.the result is airbox not aligning up
with the maf causing vacuum leaks etc.

a recent post discussed where to purchase new ones.they werent
exact size needing washers.not that thats a bad thing.

found a company(no affiliation) that offers exact metric size cylindrical
mounts that porsche used.

http://www.vibrationmounts.com

advanced antivibration components: METRIC Cylindrical Mounts

part number is:
V12Z02MFF303010 30mm 1.18 inch (length)* 30mm 1.18 width m8 thread

price: $2.55 each

 

Nice. Thank you for posting this.

 

Yeah, thanks! Getting ready to do my intake refresh, now I can put these on at the same time!

 

Great thanks..................

 

As far as S4s and later are concerned....

If there is an intake leak between the airbox and the mass-air sensor, it is for more-likely due to the rubber gasket on the bottom of the airbox than the bonded-rubber standoffs.

Again, if for S4 or later...

Whoever posted that the factory part is the wrong size didn't try hard enough. The part number is 931 110 191 00 and unless it is mis-bagged by Porsche (and that can happen) it is the correct size and doesn't need washers.

Now, if all this pertains to pre-87 then I have no comment.

 

Real men move the motor to make the airbox fit.

Well thats wot it feels like.

Apolgies to WK for the blatant plagiarism.

 

dave:
yeah i was refering to pre 87.
believe this part is nla.
post i was refering to was using a mount
McCaster sells which is little on small side but
works with washers.

my mounts were so warped along with probably others that it actually lifted the maf
from the manifold inorder to align the bolts in place.rubber gasket obviously can be a problem too.

 

I got a handful of them in May. So, if they are NLA then they are only recently NLA. There are a dozen-plus variations of the bonded rubber buffers used on all the older Porsches (like ours). They vary in stud size and rubber thickness. In the case of those on the air box the only important dimension is the rubber, the length of the studs is not important as long as both are long enough.

(Oh, and BTW, since they are "all over the place" at a Porsche shop, when one breaks the mechanic will grab one out of a pile, not check it and just throw it in. Guess what happens on an early '87 with its fuel rails mounted by bonded rubber buffers to the intake if the wrong sized buffers are used?)

The mass-air sensor should be firmly clamped in the rubber air-guide such that what you describe won't happen. Manipulation of the brackets and air box to get them to align then deform the rubber air guide without causing an intake leak. But, once everything is bolted down deformation of the air guide should be minimal. Of course, if the air guide or the thick gasket between the mass-air sensor and the air box is 22-years old then all bets are off.

The S4s work exactly the opposite of the S3s. With S3s, the expectation is that the mass-air sensor and air box are removed as a single unit. Correspondingly the S3 has a different mechanism for sealing the mass-air sensor to the (metal) air guide (i.e. a big-assed o-ring that doesn't care if the MAS is straight or not.)


Bah! Real men would have fixed the air box fit while the motor was out due to an oil change!

 

Bump ... have a pair of these if any S3 owners need them, shoot me a PM, would like to find them a new home!

 

Or you just rotate the little rubber things so they line up., BTW VW rabbits use the same type of mounts for their radiators.
()

 

Saved. My. ***.

Thank you!

 

Current price $4.25. Inflation is a hellava drug.

https://www.vibrationmounts.com/cyli...unt-11773.html

 

It looks like they have a $50 min order requirement

 

I stock the rubber isolator for $25 a pair.
Original number 928 110 049 02 - I have both the complete unit $30 each and the rubber isolator as above.
They fit 4.5l & 4.7L USA cars 80 to 84 & 84 to 86 S2 ROW cars