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Re: Can a lower compression 60x be built?
Quote:
Originally posted by trik
Allright, I finally found a decent forum with lots of info and enthusiasts for Mercedes Diesels! 
After reading too many Cummins websites, I see how a lower compression diesel can make some serious power when fuel and boost is turned up. At 22:1, the Mercedes is too close to the edge for me to tinker with a lot. So I was thinking of how to drop the compression ratio down. Well, I can't find the bore and stroke specs on all the 60x motors easily. I do know that the 601 went from 2.0 to 2.2 and the 603 had a 3.0 and 3.5. I have to assume that an increase in stroke occurred in these expansions. So, unless block deck height changed or the combustion chamber changed, the longer stroke cranks needed shorter connecting rods. Well, I know dirt about these motors, but if bearing sizes were kept the same, can the stroked connecting rods be coupled with the smaller cranks to drop the compression ratio? It may be too drastric of a change, but I was hoping to find out if it was possible. If anyone has any specs, please share!
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Reducing compression ratio will have downsides too:
* - Hard to start, heat of compression will be lower, resulting in need to glow longer.
* - lower efficiency, higher compression ratio is diesel's advantage over SI engines.
Why reduce compression ratio, only to have to pump air into the combustion chamber to make it work again?
__________________
Tony from West Oz.
Fatmobile 3 84 300D 295kkm Silver grey/Blue int. 2 tank WVO - Recipient of TurboDesel engine.
Josephine '82 300D 390kkm White/Palamino int.
Elizabeth '81 280E, sporting a '79 300D engine.
Lucille '87 W124 300D non-turbo 6 cylinder OM603, Pearl Grey with light grey interior
Various parts cars including 280E, 230C & 300D in various states of disassembly.
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