So I bought the 79 Euro as a car for my wife to drive while her 78US was in my shop getting the "treatment". It also has some great harvestable parts like Bilsteins and the Borla exhaust. It was someones track car before the last owners got it and it has been run into the guardrail. It's actually what we refer to as the "beater Porsche". So my 17 year old son is now driving it as his "first car". I take it down to the shop to fix the pass. window (bad switch) and I'm looking at the engine noting that it sure is clean.........I'll bet it's been out. So I look at the engine code and it's an M28/11. Can't find that number in my manuals. Could it be the coveted EuroS motor? Did I make the right buy for once in my life?
David

 

Bingo.

 

Well it at least has a 80-83 Euro shortblock. Good catch ******.

 

It looks like the "beater" will be donating it's engine, as well as, the exhaust, shocks, carpet and other sundries. My FWM doen't have any specs on the M28/11. Is there a place where I can those?
David

 

'81-'82 928, '80-'84 928S Dimension Tolerances.pdf

 

Erkka,
Your link did not post.
David

 

Didn't meant to post link. Thats file name of Tech Spec Book found in Morehouse CD's. Get them. IIRR Roger (http://www.928srus.com) sells them.

 

M28/11 is the engine I have in my car. It is the 300hp engine, and probably a great step up from any US 16V unit. Be aware that there is a later Euro S engine from 84 with better cam, higher compression and 310hp. In Europe, this is the "coveted" one!

 

you have to also check to make sure it wasnt just a block replacement, although it would make sense that someone just swapped the euro for the US 79 as they are both CIS and not too many differences. (i think) . However, there have been some folks that have used a euro bottom end on their top end for bottom end replacement. I dont know the easy way to check this, except by seeing a picture of the throttle body and plennum. the euro is MUCH larger diameter than the US version. heads and cams are even tougher to determine.

a dyno run will tell all.

scots 28-11 engine with the US LJet electronics and FI did 250rwhp with headers. Im sure if it was CIS, it might have been more like 260rwhp . (LJet is restrictive)

mk

 

Erkka........thanks for the information I will give Roger a call.
Mark........the throttle body is significantly larger than the US cars we have. Of course the spider runners are larger diameter and there are some differences in the vacuum routing. The car itself is a Euro model. It appears someone yanked the 79 motor and stuffed the M28/11 in the hole. I don't know where to find casting/part #s for the heads and I won't be pulling the cams anytime soon.
I picked up a US S motor to use as a base for a supercharged motor for the 78 US that my wife drives, but I'm thinking the M28/11 is now the likely candidate. I supposed it would be good to verify the top end before I get too married to the idea.

If Louie has another dyno day it would be fun to strap the kid's car on it and see what it'll do.
David

 

Any ZZZ in the VIN? Maybe it was Euro to begin with and fenders were replaced to federalize or after a crash. Just a thought. Before tossing, check transaxle too, may have a lower ratio.

Worth doing some research on the supercharger install- the lower HP US version may have lower compression and accommodate more boost. I think both US and Euro pulls are posted on Carl's site, not sure that you can rely on individual results as a basis for the decision...but more compression= more detonation if you aren't careful, and the likely need for intercooling if you weren't considering it.

 

There are subtle differences like larger intake runners, throttle body and intake valves (?) to name a few. They are not interference engines, btw.

 

SMT.........Yeh it's a ZZZ car with the "imported by" sticker, the pipe in the doors, and the side markers aft of the front wheels. Of course now I'm wondering if it is indeed a 79. It's not a tosser as I have a couple extra engines and at least another cars worth of parts. My wife's 78 US is the "queen" and it gets all the good parts, but the 79 Euro is a great driver and I think my son likes to drive it.
Excellent point about the CR. The 78US 4.5 is 8.5:1 which I believe is about ideal. I'll need to find the specs on the M28/11 and see where it ends up. A 10 to 10.5:1 motor is not going to take 9.5 to 10lbs of boost as nicely as the US. But if my baseline is 80HP more then I might still be ahead. I'll have to crunch the numbers on that one.

Anthony........ I see you have the same motor. Was that motor produced and installed in the 79 MY?
BTW......I love your avatar!
David

 

M28/11 nominal CR is 10.0:1. Actual is between 9.5 and 10.1 depending on what numbers are used in calculations.

http://members.rennlist.com/vilhuer/928EngineSpecs.gif
https://rennlist.com/forums/928-forum/344250-head-and-piston-top-cc-numbers.html

Few pictures of the engine should be enough to tell if its 4.5L or 4.7L. Intake runners are different enough between engine types.

 

The early 1980 cars were built in late 1979, which happens every year , and when imported may have been retitled as a 1979. If your goal was an extra 80 HP you just got that without the blower.