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Was in Halfords the other day browsing through the booklet that tells you what ignition lead set you need for each car. The listing which my '89 500 SEC fell under had options for both low and high compression engines.

I didn't know there were two engine types available, or is this the distinction between US and European engines?

J.
 

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Was in Halfords the other day browsing through the booklet that tells you what ignition lead set you need for each car. The listing which my '89 500 SEC fell under had options for both low and high compression engines.

I didn't know there were two engine types available, or is this the distinction between US and European engines?

J.
Yes, 500 engines come in a wide range of compression ratios, more than two actually, depending on the year and options.

I don't think they would require different ignition leads only because of COMPRESSION RATIO though!!

As far as i know, the late 80s engines used other kind of ignition wires.
 

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Was in Halfords the other day browsing through the booklet that tells you what ignition lead set you need for each car. The listing which my '89 500 SEC fell under had options for both low and high compression engines.

I didn't know there were two engine types available, or is this the distinction between US and European engines?

J.
Have you tried a forum search? If not sure how, please re visit the 'Welcome to the Forum' sticky on top of the W126 forum.
The 500/560 engines came in 8:1 (USA), 9:1, and even 10:1 engines. For some Countries, I even heard of 7:1.
Look for UK member Talbir's post's; he is one of benzworld resident experts.
I think the higher performance was called ECE / RUF.
The wires between the earlier - 1985 cars, and the later - 91 are different.
The supposedly best brand out there is Beru, Bremi is OK too, the foreign made Bosch wires are not of the same quality.
 

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Was in Halfords the other day browsing through the booklet that tells you what ignition lead set you need for each car. The listing which my '89 500 SEC fell under had options for both low and high compression engines.

I didn't know there were two engine types available, or is this the distinction between US and European engines?

J.
You have an '89 500SEC so you need the later type wires. Jonathan (the above poster) can get you a set.
 

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The MB Technical Data Passenger Cars (1993) handbook gives compression ratios of either 8 or 10 for the M117 and M119, except for M119.986, which is 8.8.
 

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In the UK 500 M117's were 9:1, except 'high output' engines (from 1986 to 1988) which were raised to 10:1. All late 500s were 10:1.

talbir
 

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Compression ratios for the M117

The MB Technical Data Passenger Cars (1993) handbook gives compression ratios of either 8 or 10 for the M117 and M119, except for M119.986, which is 8.8.
That's not 100% right.

Straight from german wikipedia:
Mercedes-Benz M117 - Wikipedia


Bauzeit Ausführung Bohrung/Hub
[mm] Hubraum
[cm3] Verdichtung Leistung [kW]
bei Drehzahl [U/min] Drehmoment [Nm]
bei Drehzahl [U/min]
69-76 D-Jetronic 92 / 85 4520 165 378
76-79 K-Jetronic ff. 8.8 : 1 160 370 bei 3250
79-81 165
78-79 Alu-Block ff. 97 / 85 5025 8.8 : 1 177 bei 5000 404 bei 3200
79-81 96.5 / 85 4973 8.8 : 1 177 bei 4750 404 bei 3200
81-85 9.2 : 1 170 bei 4750 405 bei 3000
85-87 RÜF 9.0 : 1 180 bei 4750 400 bei 3750
KAT 164 bei 4700 365 bei 2500
87-91 RÜF 10.0 : 1 195 bei 5200 405 bei 4000
KAT 185 bei 5200 390 bei 3750
85-86 ? ECE 96.5 / 94.8 5547 10.0 : 1 220 bei 5000 455 bei 3750
85-87 RÜF 9.0 : 1 200 bei 5000 430 bei 3750
KAT 178 bei 4800 390 bei 3500
87-91 RÜF 10.0 : 1 220 bei 5000 455 bei 3750
KAT 205 bei 5200 430 bei 3750

The spanish (great) website "PIEL DE TORO" also say that early versions of the M117 engine (the ones for the W116 S-class) also came in 7,5:1 low compression versions, on request.
 

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I think the low compression engines (7 : 1) were meant for third world countries with real low octane gas.

gr J
 
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