924Board.org

[jeffkay1723]

Hello, I have never owned a 924 before and I am getting used to the CIS... There is a hole in between the air intake boot and the fuel distributor where the "beam" adjusting 3mm allen is. After making adjustments to this, if I am idling, I can put my finger over the hole and the idle changes. This leads me to believe that there is supposed to be a rubber plug over this hole during normal operation? Haynes sort of alludes to this in the text but I have never seen one in a picture, etc. Can you let me know if there is supposed to be one or this hole always allows air into the vacuum side of the intake? Or a pic or part number, etc? I am still tracking down vacuum leaks but getting there slowly.

Next, I know that the injectors are threaded and have the outer black threaded collars that go into the head of a 931. My question is, is it possible to use regular 924 style injectors in the 931? Obviously I mean with some modifications to accept the o-ring style injector. Is there any other specification change in terms of fuel delivery and or spray pattern? I am able to get the 924 type injectors pretty cheap and this is a budget project so I am thinking of this approach. I would lock them into the black collars--might have to drill out the treads and use a sealant. Yes, it would not be simple to replace them later but I am okay with that as long as fuel delivery and smogging will be good for a driver. Has anybody done this kind of mod, etc?
Thanks, Jeff

[Rich H]

Yes there is defiantly supposed to be a screw cover on that hole.

As for standard 924 injectors I doubt very much anyone has bothered to check compatibility - why bother, there is nothing to be gained? At worst get yours cleaned.
_________________
1994 Lotus Esprit S4 - Work in progress...
1980 Porsche 924 S2 DITC Turbo - Original spec
1978 Homo-Sapiens - Tired spec
1953 Landrover S1 - Pensioner Spec

[Grenadiers]

good old tape of some kind will cover that a/f mixture hole as well.
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[stevekat]

The reason the insulators and injectors are threaded is because of the positive pressure in the intake. You should not use standard o-ring type, modified for the application, because they would be subject to leakage past the o-rings, where the thread version creates a tight seal.
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

[Rasta Monsta]

[stevekat]

The Porsche part number for the small rubber plug on a short steel stick for the mixture opening is:

911.110.934.00

I may have sourced this from EBS Racing at one point. Not sure if I gave them the part number, or just a description.
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

[Grenadiers]

Spike came with a touch of aluminum tape over that hole! Works great in a pinch. I subsequently found the correct part in my stash, all is well!
_________________
'83 944 Track car.
'88 924S Track car.
'89 944 Turbo
2004 Winnebago Vectra monster RV
2012 Jeep Wrangler
2014 Kia Soul
2001 Ford F350 powerstroke

[Rasta Monsta]

[stevekat]

The little rubber plug on a stick works well on my 931. My assumption was that this 911 part number is the same as my part, though I am not 100% certain. I cannot find reference to the source I used to get it. Probably Porsche, EBS or PAP. Really a convenient addition.
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

[jeffkay1723]

[ideola]

911.110.934.00 now appears to be NLA.
_________________
erstwhile owner of just about every 924 variant ever made

[stevekat]

Dan, if you want the somewhat equivalent (I think.)

http://www.autopartsfair.com/volvo-engine_parts/240-1982-air_intake-b3050_18622bos_2.html
_________________
"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.

[emoore924]

You cannot switch the injectors...