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  #1  
Old 09-19-2000, 10:20 PM
mattsuzie
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I was wondering if anyone has a digital pic of the pistons that go into my 300 or 420?

Are these pistons the same size?

Are they dished? Flat?

Thanks


------------------
'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)
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  #2  
Old 09-19-2000, 10:26 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
They are flat with valve relief cuts and swirl cavity on one side of the piston.

------------------
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
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  #3  
Old 09-19-2000, 10:33 PM
mattsuzie
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Do you know the compression ratio on these 2 engines, 300 & 420? I would assume 10:1?

I am satisfied with my 3.0 L. How about you? What were some of the pros and cons of this engine.

BTW, thanks.

------------------
'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)
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  #4  
Old 09-19-2000, 10:38 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
I love my M103. Compression is either 10:1 or 10.5:1. Not sure, but who cares... High revver, smooth, rock solid bottom end. Plenty of meat in the block. Head is a little weak (kinda soft aluminum alloy). Know for eating valve guides and seals. Performs like a much bigger engine. Not much bottom end, but I never expected a dragster when I got the 300E.

------------------
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
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  #5  
Old 09-20-2000, 08:59 AM
mattsuzie
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Considering proper maintenance, what is the expected mileage life of these engines? 300,000? 200,000? 400,000? How much before replacement / massive rebuild?

------------------
'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)
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  #6  
Old 09-20-2000, 01:04 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Matt, who knows?? Keep changing the oil every 3000 miles and keep up on the scheduled maintainance. Could outlive you

------------------
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
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  #7  
Old 09-20-2000, 09:18 PM
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Join Date: Mar 1999
Location: Suwanee, GA, USA
Posts: 4,712
I think the 103 had 9.2:1 and the 104 had 10:1.

------------------
Benzmac:
Donnie Drummonds
300E
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM
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  #8  
Old 09-20-2000, 10:02 PM
mattsuzie
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I don't know engine numbers so I am right by saying the 103 is the 3.0L and the 104 is the 4.2L

If the 3.0L is only 9.2:1 , then why do I have to put premium gas? Can I get away with 87 octane? This seems like low compression to have the hi octane??? The 4.2 I can see, but not the 3.0?? What do you think?

------------------
'89 420 SEL
'90 300 SEL
'68 Olds 88 Convertible
'84 300 SD (sold it)
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  #9  
Old 09-20-2000, 11:25 PM
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Join Date: Jan 2000
Location: New Bedford, MA USA
Posts: 1,583
Matt, I think the M104 is essentially the M103 with a 24 valve DOHC head on it. They might have upped the displacement to 3.2, but I am not sure. I don't think that block could ever be stretched to a 4.2.

------------------
Jeff Lawrence
1989 300e
2000 Dodge Grand Caravan SE
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