John Speake

The Euro 16v are fairly torque-y but they don't really pick up and go until they come on the cam at about 3500rpm.

Any of the 32v have better low end torque than the 16v.

GregBBRD

I've been told, my entire 928 life, that Euro 2V engines are interference.

I actuallly have no practical knowledge to verify if this is true, or not.....nor do I want to have any.

They have very deep valve cutouts in the pistons....why would they do that if they didn't want them to have clearance under all conditions?

For all the "horror stories" regarding tensioners and belts, I've only had two engines bend valves, after working on literally thousands of these engines, for almost 40 years.

One engine broke a cam drive "triangle piece", from not being correctly tightened and the other one stripped virtually all the teeth off of a 75,000 mile 20 year old belt.

SeanR

Only been in it a portion of the time you have and I've had two engines bend valves, both GTS's. One with a busted cam and one with a PKT bolt failure.

Did have an '85 Euro with a broken cam nose but the valves didn't bend. Found that a relief as did the owner.

PorKen

Typos abound as well. Some literature says 265 TQ for USA 4.5 L-Jet but 256 is found in other documents. (4.7 engines are listed at 263 so 256 makes more sense.)

SMTCapeCod

The for-sale ads are almost as bad as the factory literature...meaning the rumor mill might've been stoked from so many adds claiming early imported Euro 4.5s have the 310HP motor.

Strosek Ultra

The Euro 2-valve 4,7 liter engines or 928S as they are called over here are rated 300 HP (K-Jetronic) and 310 HP (LH-Jetronic models 1984-85). I dynoed my 1985 Strosek (310 HP) many years ago and it had 185 KW or 252 HP at the wheels. We ran it with stock air filter, K&N air filter and without air filter and found no difference in power output.
On the very same engine the nose of the left hand side camshaft once broke resulting in a few bent valves, not very hard, no damaged to the pistons. Exchanging the bent valves and a few valve guides was all that was needed.
Åke

Vilhuer

There are many different scenarios of bent valves. Taking cambelt off and rotating shafts or breaking cam or belt when engine is running etc. I think every 928 engine which do not have 45 degrees marked in damper can be rotated around freely when engine is stock and there is no buildup on piston tops. When these conditions are not met anything can happen. Engines with 10.4:1 pistons are definitely close while all K-Jet 4.7L and early '84 which still use early S pistons have more reserve.

GlenL

I had some "touched" valves on my '80 Euro S. Overrev? Perhaps.

The later pistons have shallower notches...for what that's worth.

Something to add to the debate is the different cam lift when the oil system isn't pressurized as the lifters will be fully collapsed.

In the end, what's the point? Differ maintenance and take a different risk?

Don't let the T-belt snap. You'll thank me.

Ducman82

Exactly! In the end it really does not matter. Keep her maintained and happy, and all will be well.