924Board.org

koolkarateguy · Posted: Sat Apr 28, 2007 11:26 am Post subject: Head Rebuild

Hey everyone, I think the time has come to seriously consider a cylinder head rebuild. Anyone have any suggestions regarding performance parts such as cams, headers and such and some sources ?
_________________
1979 N/A 924

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

Send it to European Motorworks in California, get the Big Valve work done, comes with cam of your choice, total head rebuild, bigger valves, stiffer springs, porting, the list goes on. Best $1100 I have spent on the car.
_________________
1987 951 - M193 Version for Japan

462avi · Posted: Sat Apr 28, 2007 2:54 pm Post subject:

Chrenan

Does this do any good for the 931? Sorry for the string highjack

Geoff
_________________
2005 C230K
2002 grand cherokee with 4.7L

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

If you are going to pour money into the cylinder head, start with one of the better ones.

Use either the early Euro Engine cylinder head with the "D" shaped ports, or the later 80 or 81 cylinder head. The intermediate model year cars that came with smog pumps had a head design that tends to crack between the middle cylinders.

Peter_in_AU · Joined: 29 Jul 2001 Posts: 2745 Location: Sydney, Australia

If you compare the NA intake ports with the 931 intake ports you see what a total disaster the NA head is. If you show the NA head to any specialist he will suggest doing what Porsche did with the 931 intake ports; fill in that huge lip at the opening, lift the roof and generally tidy it up.
_________________
1979 924 (Gone to a better place)
1974 Lotus 7 S4 "Big Valve" Twin-cam (waiting)
1982 924 (As featured on Wikipedia)

Learn to love your multimeter and may the search be with you

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

koolkarateguy · Posted: Sun Apr 29, 2007 12:59 am Post subject:

Hi thanks for the input. I live in Nova Scotia, Canada. The head will not be leaving the city nor will I be changing the head. What I was wondering is keeping the fact that the head will not be switched nor will it be shipped out of town, are there any parts in it like cams and such or anything else that is worthwhile upgrading while it is out of the vehicle.

Actually Chrenan , did that $1100 you paid include round trip shipping to Alberta ?
_________________
1979 N/A 924

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

No, that was extra, can't remember the total for shipping, but it wasn't as much as you'd think.
_________________
1987 951 - M193 Version for Japan

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

931 head can benefit from porting/polishing.
_________________
Toofah King Bad

WeiBe (1987 924S 2.5t) - 931 S3

koolkarateguy · Posted: Sun Apr 29, 2007 2:40 am Post subject:

Thanks but I don't have a 931 head. So again, anything that'll benefit a 924 N/A head specifically ?
_________________
1979 N/A 924

NEMESIS · Posted: Sun Apr 29, 2007 4:39 am Post subject:

Upgrades? Not many.

Hotter cam profile? Yes. Integral, Webcams, Piper, Schneider, European Motorworks, Elgin, and others.

Stainless steel valves? Yes. SI Valves

Adjustable cam gear? Yes. Too many to list.

Other than that, just your basic rebuild will do. Check all the tappets for wear, replace guides, seals, 3 angle seat, and do not port and polish the intakes, only clean up the rough edges and smooth it out. DO NOT attempt to port it or you run the risk of loosing much needed velocity by opening it up too much.

Headers? MSDS, Stahl, Bursch and maybe some others.

By the way, all of this information can be found by using the SEARCH function at the top of the page, that's how I did it.

Tigger937 · Posted: Sun Apr 29, 2007 5:04 am Post subject:

I've heard good things about ExtrudeHone for the head, intake & exhaust manifolds. Anyone have experience with this? Cost?

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

NEMESIS · Posted: Sun Apr 29, 2007 6:02 am Post subject:

koolkarateguy · Posted: Sun Apr 29, 2007 9:22 am Post subject:

Thanks Nemesis, I appreciate the info it was very helpful. And I did do a search, but it doesn't hurt to ask a question to get some opinions.

_________________
1979 N/A 924