924Board.org

GregSC · Joined: 19 Jul 2008 Posts: 122 Location: Lovely, KY

I have a 77 N/A that I am in the process of restoring. It is a Martini so I would prefer to keep it as stock as possible (at least to the eye). With that said I would like to get a little more out of the engine than the 95hp that the current XH engine provides. After reading several posts here on this site it seems that a good choice would be to upgrade to the equivalent European engine (XK engine).

If that is a viable option (and I'm open to correction), my questions are what components do I need to complete the transformation? What are the steps necessary, and where is a good place to find the needed parts? My expertise won't allow me to perform the work myself, and my location limits access to a variety of mechanics that are familiar with these older 924s. I am confident that I can find a good shop to rebuild the engine in a larger city a couple of hours away, but I would like to be able to direct them as to exactly what I needed them to do, and provide any parts/accessories that they couldn't readily get a hold of.

I reviewed several posts that hinted at different aspects of this type of rebuild, but I couldn't find a definite parts list of what I needed to transform a 77 XH to what is essentially a XK, or a list of procedures that should be undertaken to complete such a task.

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

You'll need euro pistons to fit the bore of your engine (see my signature), or to fit the bore of your engine if an over-bore is deemed required on teardown (very unlikely, the 924 block can withstand an atomic explosion).

Cam is the same.

Valves in the 77 I think are smaller.

So, you'll need to cut in larger valves, so why not go bigger anyway (see my signature).

You'll have to pop the cam out to do the valves, why not replace with a hotter cam (see my signature).

I've been down the path you are heading on, but I went beyond the euro spec engine and am very, very happy with the results.
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1987 951 - M193 Version for Japan

GregSC · Joined: 19 Jul 2008 Posts: 122 Location: Lovely, KY

Thanks for the information Chrenan, very appreciated.

A couple of more questions based on this info (for you or anyone who might be able to respond)

1. Do you know of a good supplier for the Euro spec pistons? Bigger values? (I was able to locate the cam from Integral Cams)

2. Will I be able to use the stock fuel supply effectively with these modifications?

3. What kind of performance improvement can be reasonably expected from these modifications?

PORSCHEV · Posted: Sun Jul 20, 2008 11:15 am Post subject:

It will cost you a smalla mount in extra machining but it will pay off in the end. Check this out on the for sale section. If I was doing another rebuild ........it's a great deal.

http://www.924board.org/viewtopic.php?t=26236
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1976 924
5 lug conversion, 17'C2 wheels,custom body work,327 vette engine.

1978-#53 "D" track racer.

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

Also Greg, to be on the safe side you may want to consider stock rods junk, as bolts are NLA and they are not supposed to be reused. One of our members spec'd out replacements with a custom rod maker, but be ready to drop $750 for a set.
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Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

Chrenan · Joined: 15 Jan 2003 Posts: 3903 Location: Canada

Rich H · Posted: Tue Jul 22, 2008 12:34 am Post subject:

Try Porscheapart in the UK

They will be able to help I'm sure...
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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

GregSC · Joined: 19 Jul 2008 Posts: 122 Location: Lovely, KY

Thanks guys, all the replys have been very helpful. I appreciate your time.

Cedric · Joined: 27 Aug 2004 Posts: 2801 Location: Sweden

I have two sets of europistons i think, (lots of parts in the garage

). Is it worth the hassle to send them over the sea, can i get any money besides the shipping ?

. Or maybe i can send them over with my folks whos flying over in august, hmm. If your intressted i can se what i have in the garage. At least one set.
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1980 924 Turbo
www.instagram.com/garagecedric/

Raceboy · Joined: 01 Mar 2004 Posts: 2327 Location: Estonia, Europe

TOM087 · Joined: 19 Jun 2007 Posts: 73 Location: Hobart, Australia

i'm thinking about doing the same thing with my martini too, and i've located a set of 9.3:1 piston and rod set for $150aud. The parts are from an 84 though, and, with my non-existent knowledge of engines, i've no idea of whether they can be used in my 77.
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1977 Martini Rossi

tuurbo · Posted: Wed Dec 03, 2008 1:59 am Post subject:

Raceboy - yeah the points you make are good ones - the rods are fine and the bolts are fine - but the supply of bolts is nil. And without rod bolts, what good are even excellent rods?

Like, what torque would you use on a bolt that's stretched or used, when using them changes everything?
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1980 924 turbo, MSD, Meth. Inj, otherwise stock.

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

ideola · Joined: 01 Oct 2004 Posts: 15550 Location: Spring Lake MI

Rod bolts can now be gotten at least. The first run from ARP should arrive sometime in January. I've order a few extras and EBS has promised to pony up for five sets to put on their shelf. Still awaiting payment from them, so if it doesn't come thru, I'll have 8 sets of rod bolts that I'll be very anxious to sell

Anyway, now that ARP have the specs, we can always do another group buy in the future.
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erstwhile owner of just about every 924 variant ever made