Nicole

Someone on ebay claims that swapping the intake from US to Euro on the 2-valve engines brings 45 HP. This sounds like too good to be true. What do you guys think?

Euro Intake

ribs

Hmm...I seriously doubt it. I think the euro engines had higher compression pistons for the early 16 valvers and less smog equipment...but I am a 944 guy, so I could be wrong.

2V4V

Nicole,

In a word, no. The 300hp Euro/ROW 4.7L motor has (at least) the following variences from US - higher compression, different intake and runners, different cams, different heads with larger valves, twin coils and a 'split' distributor (two caps 4cyl ea.), different fuel computer, different spark computer. That's the big stuff. There are other little things as well.

Any of the pieces could make some small positive impact on HP.

Can you get most of the ~50 HP difference between the US and Euro motor by bolting on the intake alone? Only if you use an old intake runner as a crack pipe while reading your dyno sheets.

Greg

Joe R

Don't forget to remove the CATS.
Go Navy

DaveW

Yup, 1886 Euro 86 S's rule! (apart from GTS's obviously!)

These last 16V (300/310 HP) cars have a higher power to weight ratio than any other 928 apart from the GTS which is not far ahead as a lot of weight was added in the later cars. They also have other 'S4' equipment like bigger brakes and ABS. And hey, I've got one!

I like my car.
DaveW

Jim V

I would expect that you would get some HP gain by bolting these parts on however I think the gain would only be top end and there would be a loss of HP at the lower end
(where you drive it). From what I understand
the main performance limit on the L-jet engines is the air flow meter; I'm not sure
if that's true but an induction system will
only flow as much as it's smallest component.
If you are going to hot-rod it, a Euro induction set would be a worthwhile investment but you've gotta have those bigger
valves.

Jim V

Should've looked at the link 1st, he says
he's only got 4 of the runners, where you
gonna get the other 4?

Bryan

The '84-'86 Euro also has a hot-wire air mass meter as opposed to the flapper-door L-jet type. I've gotta believe the L-jet air flow meter is more of a restriction than the intake plenum and runners. The '84-'86 Euro also has significantly different exhaust manifolds which I would think would be the hot ticket upgrade for a US car. If you're going to bolt Euro pieces on a US engine, I'd start with the exhaust manifolds and a free-flowing exhaust.

Bryan

dr bob

All:

I think Mark Kibort's "part Euro" car had a US engine with Euro manifold, a reworked air flow sensor, and from memory some rework of some interconnecting pieces to get smooth transitions. The results were respectable, but I don't thing that 45 extra HP was available from the intake work alone. Mark had headers, no cats, bigger-bore exhaust, etc, and was still shy of the 300 RWHP point if I remember correctly.

I guess with a 310 crank rating, you might expect to see 275 or so RWHP with a genuine Euro driveline still original. Slightly less than what Mark saw with the extra exhaust mods.


That engine is now with Rich Andrade in Phoenix, destined to live in his white '79 track car. Mark is the proud owner of the former Holbert land speed record S4, soon to be red again and on the track.

Jim Nowak

Dr Bob

A 928 with 310 crank hp will dyno around 240-250 RWHP on a Dyno Jet. A stock S4 with 316 crank hp usually dynos around 245-265 RWHP depending on an automatic or manual tranny.

Jim Nowak

Randy V

The bidding is heating up on this one - with Mark Anderson of 928 International leading!

Maybe he knows something we don't?

ebay auction for euro intake

2V4V

What Mark knows is at $200, it is slightly under compared to sourcing from Europe.