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#1
03-29-2005, 04:21 PM
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M103 Rocker Arm Ratio?
This is a wierd one,,, Anybody have any clue what the rocker arm ratio is on an 86 300E M103 engine??
Thanks! Adam
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Current Stable: 01 ML55 AMG 92 500E (a few mods) 87 300E (lots of mods) 00 Chevy 3500HD Diesel Box Truck 68 18' Donzi Marine  06 GT i-Drive7 1.0 Mountain Bike (with GPS!  )PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320 
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#3
04-01-2005, 07:05 PM
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Anyone?
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Current Stable: 01 ML55 AMG 92 500E (a few mods) 87 300E (lots of mods) 00 Chevy 3500HD Diesel Box Truck 68 18' Donzi Marine 06 GT i-Drive7 1.0 Mountain Bike (with GPS! )PREVIOUSLY OWNED:83 300SD, 87 420SEL, 88 420SEL, 90 420SEL, 86 560SEL, 86 190E 2.3-16V AMG, 94 E320
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#4
04-01-2005, 07:36 PM
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Tell the truth... I'm not sure what that means.
Does this sheet help?
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-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13 http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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#5
04-01-2005, 07:46 PM
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Pretty sure M.B.Doc or Gilly will know.
 A264172 What it means is this, I'll just use a Chevy for this. One end of the rocker arm is moved by a pushrod, which in turn is actuated by a hydraulic lifter, which is actuated by a lobe on the camshaft. The other end of the rocker arm actuates the valve. This is not a 1:1 ratio. For instance on a small block Chevrolet, this ratio would be 1 : 1.50. I.e. for every 0.100" lift at the camshaft, you would have 0.150" of lift at the valve. For more detailed information ( or if you really care ), you'll have to pay me.
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2007 C 230 Sport.
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#6
04-01-2005, 08:13 PM
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Quote:
Maybe when I find a cheap valve spring compressor that will work well on my M103... and attempt the seals, sometime in the future. I'll get back to you on that. Adam, Is that a preformance mod you are attempting? Manny ain't talkin
__________________
-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/showpost.php?p=831799&postcount=13 http://www.peachparts.com/shopforum/showpost.php?p=831807&postcount=14
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#7
04-02-2005, 10:06 AM
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I've never seen a published rocker arm ratio for M102/3, but by looking at cross section drawings of the engine I would surmise that it is essentially 1:1, which is maybe why it is not mentioned in any specification lists.
Rocker arm ratios are not constant, but vary with valve lift. For example, everyone "knows" that vintage Chevrolet small blocks are 1.5:1. Not true! I've measured the rocker arm ratio on my '63 Corvette with mechanical lifters and it is 1.37:1 at the lash point and 1.44:1 at maximum lift with a cam lobe height of about .300". Duke
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