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Originally Posted by kk9
You'll note here a "7" can indeed be correct for your car.
http://mb.braingears.com/124_DISC1/P...03/15-1031.pdf
This shows H7 was standard upto 2/87 and on 103.980.
As my engine is 103.983 and a euro model, I should be using H8 for normal compression and H9 for low compression if I understand it right or do I ?
Again it seems as per the manual if I use H9 I should not drive over 160Km/hr.
To be on the safe side should I use H8. what will I be sacrificing if I use H8 or after reading this link what do you think Duke2.6, should I still use H9.
I rarely would drive above 160Km/hr and only if challenged and that too in short bursts. |
You're kind of analysing this thing to death, but I've been known to do the same thing, so I understand.
If you rarely have an opportunity to drive at a SUSTAINED 160 KPH or greater, then your driving conditions are similar to the USA, and M103 owners have good results with H9DC or H9DC0.
IIRC the 103.983 engine is the one with 10:1 CR, where all the other 103s are 9.2, but this modest difference in CR has no meaningful impact on heat range selection. It's based on the peak sustained output demand for your driving conditions, and if you rarely have the opportunity to cruise at 160 KPH or more heat range 9 should be just fine, just as it is for USA driving conditions.
Brief bursts of full power to accelerate to cruise speed or brief bursts to 160 or more will do no harm. I do so at almost every opportunity!
Duke