924Board.org

PieszczoH · Joined: 03 Dec 2009 Posts: 66 Location: Warsaw Poland

Hi DutchPug
I wounder what is the model of KN filter that You used and ewentually the dimensions of it.

DutchPug · Joined: 27 Jul 2008 Posts: 94 Location: the Netherlands

Hi Pieszczoh,

It is K&N RE-0880; 4" intake hole, 6" bottom, 14" long.

PieszczoH · Joined: 03 Dec 2009 Posts: 66 Location: Warsaw Poland

Thank You !
I need something like this.
I use standard shaped performance filter and it collide with the retractable lamps so in the end I run with lamps standing all the time...
Hope this kind of filter will help me.

DutchPug · Joined: 27 Jul 2008 Posts: 94 Location: the Netherlands

Been driving the car for a bit, thought it was time to up the boost pressure a bit further... Who wants to know what power it made at 2 bar?

I do... all I can tell is that a rod did not a agree and decided to leave the engine.

Have a spare engine, the plan is to build that with forged internals. (not going to do the k-swap on this car anymore, think it is more fun keeping the original engine)

gegge · Joined: 27 Jul 2007 Posts: 1124 Location: Sweden

I DO WANT TO KNOW!

(Guessing CR was on the brave side of safe...)
_________________
Carl Fredrik Torkildsen

924 turbo -81 Carrera GT RESTOMOD
924 turbo -80 Dolomite De Luxe
924 -85 DP kit, BBS RS, M030 and tuned engine
924s -86 Black on black turbo with Fuchs

WEASEL149 · Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield

Fasteddie313 · Joined: 29 Sep 2013 Posts: 2596 Location: MI

Raceboy · Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe

And that is Euro 924 NA with 9.3:1 CR. I am guessing around 400whp at 2bar.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

WEASEL149 · Joined: 19 Aug 2005 Posts: 595 Location: UK, Sheffield

morghen · Joined: 21 Jan 2005 Posts: 8880 Location: Romania

do you have like videos of the thing going at 2bar?
_________________
https://www.the924.com

Raceboy · Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe

Even if it is a rod bolt, it still proves that these engines are very strong even with stock parts.

If I am not mistaken, Pieter revved the engine a bit higher with new cam and that may very well be the root cause of rod bolt failure, not 2 bars.
If it was not a bolt, but a rod, then it is probably high limit of the rod itself.

But truly, there is no point spending loads of money on lower end, better to spend it on making the head flow better and focus on the engine management.
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

Harhmless · Joined: 09 Sep 2015 Posts: 14 Location: Buffalo, NY

So..hypothetically of course...What do we suppose one would have to do to imitate these numbers with a '80 931 Engine? Is this possible?

For a guess- With a fresh block rebuild, slightly larger injectors, and a 4" straight pipe with a 20 PSI wastegate...What would you suppose power numbers would be at? (and should I invest in a really big fire extinguisher)

Raceboy · Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe

931 pistons and rings are weaker than 924 NA, as weird as that may sound...
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche

DutchPug · Joined: 27 Jul 2008 Posts: 94 Location: the Netherlands

Thanks for the support

.

Knew I was taking a risk with the engine, but if you don't try... you never really know

Had the rev limiter at 7200...

The rod of the first cylinder broke about 2 cm above the big end. The big end is still nicely attached to the crank

.

It happend on the high way; had just done a full pull through fourth and shifting hard in fifth. The rod snapped after spending about a second in 5th gear. It snapped out of the blue, no signs indicating its will to leave.

Have not pulled the engine yet, but the gaping hole in sump makes for easy viewing.

The plugs looked perfect on all cylinders, except for the first, where the piston gave it a little kiss; it only closed the gap of the plug

Raceboy · Joined: 01 Mar 2004 Posts: 2326 Location: Estonia, Europe

That was my guess. The rods are quite heavy and could not cope with the hugely increased tensile loads. I have never dared to rev the 924 engine past 7k on regular basis...
_________________
'83 924 2.6 16v Turbo, 470hp
'67 911 2.4S hotrod
'90 944 S2 Cabriolet
'78 924 Carrera GT replica
'84 928 S, sold
'91 944 S2, sold
'82 924S/931 "Gulf", sold

'84 924, turbocharged, sold.
http://www.facebook.com/vemsporsche