924Board.org

356speedster · Joined: 06 Aug 2006 Posts: 122 Location: Norway

Hi

My 1982 (ROW) 924na Manual is accelerating with a good pull up to about 5000 rpm, but then the pull just dissapears, and it feels like I have to push the engine up to the redline. in other words: there is no action above 5000 rpm. But it is smooth without any missfires or engine cut-out.

When reading about others that enjoy to take it to the redline, I figure there must be something wrong.

So I need to locate the problem, but what should I inspect/replace?

BTW: the engine does have serious ticking noise (sound like a diesel) so I guess it needs a valva adjustment, and there is an issue with high idle after engine is run hot. Not sure if these things are related tough.
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1982 Porsche 924 na My 924 blog
1990 Porsche 928 S4 My 928 blog
1995 Fiat barchetta
2007 BMW 318d M-Sport
2010 Volvo V50

-nick · Joined: 16 Nov 2002 Posts: 2699 Location: Cambridge, MA

Check to make sure your distributor is advancing as the rpm's go up.

It's a little tedious, but measure the distance between the 5 and 10 degree marks on your flywheel (or 0 and 10 or whatever) and make marks every 5 or 10 degrees on the flywheel with a marker - up to about 35 degrees. Then, with a timing light connected, raise the rpm's and watch that the marks move past.

Timing makes a big difference in peak power!
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1980 931S
15psi boost, MS-II, EDIS, 951 IC, custom intake, Ford 5.0L throttle body, Forge BOV, WB o2, G31 w/LSD, 964 wheels, 968 rear sway, Bilsteins, 200# Welt. springs. A laptop, and a partridge in a pear tree.
1991 964 C4 Cabriolet

Rasta Monsta · Joined: 12 Jul 2006 Posts: 11733 Location: PacNW

Or get an advance timing light. . .way less tedious (and fun to play with).

Your car may be leaning out too. . .changed the fuel filter lately?
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

gohim · Joined: 02 Nov 2002 Posts: 4459 Location: Rialto, CA

The 924 engine does not make much hp, and the max is in the 4XXXrpm range.

Just what do you expect from the engine when you have already exceed the rpm where it makes the most power?

356speedster · Joined: 06 Aug 2006 Posts: 122 Location: Norway

StienbargerR · Joined: 28 Oct 2005 Posts: 1362 Location: Richmond, IN

Speedster, how many miles on your car? I think that the older cars get they probably just loose their peppy-ness. And have you tried just putting fuel injector cleaner in? That might help a little bit.

Ryan
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1978 924 NA
-250lb lowering springs, Euro Pistons

dpw928 · Joined: 02 Nov 2002 Posts: 1860 Location: owasso, ok 74055

If your 924 is equipped with a catalytic convertor it could be partially plugged. Also, it could be running lean which would explain the dead top end and the hot running.

Dennis
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81 931 5 sp
78 928 5 sp Silver
78 928 AT Euro Black