924Board.org

[northwolf]

Hello to everyone on board

I bought an 924 NA '78 a few days ago and i'm planning to upgrade its performance slowly during the next year or so.

Car is currently fitted with a vertical weber carb (i will have to check it's type and size soon) and a airfilter box that draws the air in from above the exhaust manifold.

So my current plans for the car are:
1)Remove the "joke for an airfilter" and replace it with a front wounted CAI unit.

2)Get the carb adjusted for 98 fuel and the CAI

3)Dyno run to see if the carb is adequate

If the carb is sufficient to feed the engine, i will drive this summer happily, if not then what?

EFI or bigger carb(s)?

Long term plans include a big-valve head ( i have a good connetction to a local machine shop), agressive street cam and some other mods. I've read a lot of threads, but haven't located many dyno charts of modified NA cars, how much is possible to achieve from this engine? Is 140hp out of the reach?

Exterior will be left as it is (with some repainting of course)

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'78 924 NA with a weber
'84 MB 200d (hidden away)
'87 BMW 735ia Shopping cart

[Slam]

Welcome to the board! Nice-looking car, and carbed to boot. Have a look for Chrenan's engine build - he went with the big-bore head and a cam and was quite satisfied with the results.
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'84 944 - kid blew motor
'83 944 - resting comfortably. For 12 years
'87 944 - sideswiped by trucker
'80 924 - gone
'78 924 - gone
'77 924 - rusting comfortably

[northwolf]

Long pause in a project, had to do a lot of work on my "daily driver"...

But having time to plan my first stage:
1) Replacing all bushings in the suspension
2) Installing stabilisers 26.8 and 16mm
3) Replacing front shock cartridges with new bilstein sports
4) Some stiffening to the rear


Second stage will most likely be a freeflow air cleaner on top of that carb and a dyno run to see if make over 100hp (it's a stock eurospec engine)


And a pontiac bulding friend of mine, planted an idea of a small mini or mercedes sourced SC + Carb combo with low boost and about 145hp...



Can anyone of you identify this carb:



_________________
'78 924 NA with a weber
'84 MB 200d (hidden away)
'87 BMW 735ia Shopping cart

[9xx]

[ideola]

Nice project, thanks for sharing! Could you take some additional photos from a bit further back? I'm very interested to see the manifold setup.

FWIW, carb plus forced induction of any sort is a difficult path to go. If you're going to go to the trouble and expense to supercharge, you need to make a custom manifold anyway. It's hardly going to add much to the cost to have some injector bungs welded on. From there, going to an EFI conversion should be much easier than trying to get a supercharger to work safely and reliably with your 2-barrel setup. Even if you get it to work, the carb is going to be the constraint, and you'll want to upgrade to something with more flow.

With the Euro motor to start with, you definitely have some potential. Anecdotal evidence suggests that 140 HP should be within the margins of the motor itself. However, I doubt you'll get there with the two barrel carb. Most of the 125+ HP carbed cars were running dual Dellortos or dual Webers.
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erstwhile owner of just about every 924 variant ever made

[northwolf]

I'll snap a few pictures from the enginebay.

The carb setup is an old one, probably made in the early nineties or so, no one knows exactly. I've seen well running turbo-BMWs running on 2-barreled pressurised webers... i could get my hands on one with a decent pricetag. Those 316s were putting around 150-180hp from a 1,8l engine.

But as i said, first i have to get the suspension done and then decide on the engine. I'll be limited to below 150hp or so (the early US-spec 931, with rear drums?) due to the lovely finnish laws.
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'78 924 NA with a weber
'84 MB 200d (hidden away)
'87 BMW 735ia Shopping cart

[Ozzie]

Webers usually have the model stamped into the side of the base plate.
more than likely on the hardest side to get a look at.
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Porsche 924 1984 (UK import) NA
Its AUTO and its BLACK
Montego Black on black/red
Engineer of Electro/Mechanical Systems Maintenance