TOPIC: Euro S Heads

928s are good on the track, and my 1979 Euro track beast always turns heads. It has a "hybrid" motor, a 1985 5-liter block with 1983 Euro heads and intake. The transaxle has also been upgraded to an LSD 1985 5 speed. I kept the original 1978 CIS injection system. The exhaust is MSDS headers into a single 4 inch pipe with a Flowmaster muffler - it sounds as mean as it drives. It has 1987 S4 4-piston Brembo brakes, Koni/Eibach coil overs with a Devek adjustable front sway and 928 Specialist rear sway stiffeners. The interior is all removed and a roll cage is installed.

Nice rides.:cool:

Is there a performance benefit to using the Euro heads on the 5.0L block? Or is there another reason?

Richter12x2;197 wrote:
Euro S heads have bigger valves so there is a performance advantage, and mount to the 5L block without any needed modifications. Euro S cams have a performance advantage as well. Intake and injection can stay the same.

US 5.0L blocks come with 32v heads, intake and injection would need to be adapted or changed. Electronics would also need to change.

As I recall....

Gotcha, so basically it's easier to swap a 5.0 bottom end into an early car than Euro S heads into a late car, is what I'm hearing.

Richter12x2;200 wrote:
The later cars have 32v motors. I don't think there is any case where the 16v Euro S heads would be an improvement over the various 32v heads out there.

Oh gotcha! I misunderstood then. When I was asking about whether or not the Euro heads had any advantage, I meant over the stock 5.0 heads. Basically the Euro heads are to allow you to use the existing computer and intake setup while still flowing enough for the 5.0 bottom end. I think we're on the same page now.

I have an '85 car, and I hadn't heard of people swapping the Euro heads for power before, so that's where I was coming from when I was asking.

i was told that the 89 928 i got from japan has higher hp then the US bro,.. is that true?

I wasn't concious that we were discussing this in Rich's profile thread. I copied this topic to http://forums.928oc.org/vbulletin/showthread.php?t=64 and will remove the posts from this thread.

Sorry Rich!

B.W.Haugen;222 wrote:
Not that I am aware of, I believe all post 1986 928s are the same performance levels throughout the world. http://www.928gt.com/t-928engine.aspx lists the hp of each motor.

928racer;224 wrote:
the way the DOT mechanic explained it to me was that it was due to the emission requirements over there are less so it was not de-tuned as bad
guess it don't matter much. The first step is this exhaust i had built.



That nice spread will make easy access to the flywheel cover, reduce weight and allow for more flow for future mods. I was told this could be an extra 20hp.
The second add on is going to be that new air filter assm. I heard about.
I asked for the e-mail when its ready

You know there are X pipes out there that would be an improvement over the straight cross pipe, right?

The filter assembly looks nice, I think it is often used when motors have forced induction.

928racer;227 wrote:
Ya 928racer i was looking at the X pipes but i decided that the cost was a bit more then I could handle. with the canadian shipping and exchange and duty i only spent 1/2 of what they would have cost me.

BTW as to keep with the thread post I was looking through those pdf manuals that i downloaded (not sure which forum) and there were lots of specs for most of the years and euro engines Rich. maybe they would be a help. If I find the thread again ILL come back and post a link.

found it
http://www.cannell.co.uk/928_Workshop_Manuals/1989%20Wire%20Diagram.pdf

Richter12x2;217 wrote:
There are several performance benefits to this setup

a) 5 liter vs. 4.5 or 4.7 liter = more displacement = more power
b) Euro top end, as said by others larger valves, larger throttle body, larger intake runners support better airflow = more power
c) Euro cams = better profile for higher RPM power, less low end torque. I really need 3,000 RPM to get power (vs. better low-end on 32 valve motors)
d) Headers/custom exhaust = more power

The car weighs around 2700 lbs, so it is a good bit lighter. All the better for the track, helps the 4 piston Brembos slow down well.

My Euro engine with the improved exhaust puts out similar HP to my GTS, but lacks the low end torque.