I pulled my supercharger and did some porting and polishing. Tilted it downwards after removing the oil plug, then refilled it with jet oil from Needswings. In members past post there has been discussions about the supercharger's 4 silencing ports. I machined out 4 aluminium tabs from junk to fill in the silencing ports. I figured there would be less time with welding heat and possible warpage with these tight fitting taps in place. At the rear silencing ports,there's 2 small holes drilled 8" deep into the supercharger's casing. Not knowing the holes purpose,I raised the rear taps so these holes could vent out at a 90 degree if it needs too. Took it to Nitro in Mooresville,NC to be welded. No Warpage, Thank God. Now the whine is just slightly louder during normal driving. Oh My Gosh,at WOT. The whine is somewhat louder,but there's a loud whistle mixture with it. Dogs on leash walking down the sidewalk now turn around to look at my approaching car then jerk free and run when I kick down the car. Twice with very little driving,I have tripped the CODE- PO 108 CNF MOD 10 Manifold Absolute Pressure or Barometric Pressure Circuit High Input. With one eye on the road and the other on the wideband,looks like it trips at 21 PSI. I'm running a 185 pulley. My A/F use to be 11.4 at WOT. Now it's to lean at 13.2 WOT. I'm running the Needswings fuel management kit so I should be able to just turn in the vacumn **** to increase fuel. Another day project. Squirrel Crusher

 

looking good you did a nice job of making the fillers. you cleaned up the 3 intake runners on each side of the sc also correct?

 

Alright, extra boost? Can someone point me to the right threads to read up on this? I would love to do this mod.

 

I completely understand the port/polish aspect increasing flow, but I guess I'm not following this plug mod. From the pics, it looks like where the fillers are going is in irrelevant places. I guess a before/after might help me understand or maybe a link to these other threads.

 

Be careful with that 13.2 AFR at WOT... Would spoil your day to send something to the graveyard. Pistons and rings are probably not cheap for this aging platform. install labor too...

 

I'm not totally convienced just yet if this mod has a performance benefit or not. It's definately a high risk project because of possible heat weld warpage. Dan Timmons owner of Nitro in Mooresville,N.C.who has projects in the Genius Book of World Records and designer and manufactor of Nas Car's 36 lazer offical car body inspection station is the one I trusted to do my welding. I'm thinking that welding in these silencing ports with taps has got to somewhat increase boost. I've never thrown a boost code until doing so. I could be all wrong here,but here's my theory. There's just a small opening at the back of the supercharger and on the bottom that passes air. Each side of the blower's rotating vanes are sucking air, then meeting in the center,then blowing out the air. The flanged case opening on the bottom where the intercooler is bolted,are cut exactly to line up with the blower vanes. Except for the notched silencing ports. Being the notched area isn't lined up with the blower vanes,it makes this notched area useless and just tones down a whistle effect that Mercedes doesn't want. Just my thoughts and no proven documentation. Squirrel Crusher

 

Here is a pic of a V8 charger and shows the slots on the bottom of the SC that are still open.

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this is crusher's blown up next to the one above with the tabs already welded in.

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Crusher, what's going on here with the white tabs and red arrows on the intake side?


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JesseJamesSRT6..Good picture of the slots on the V-8. Thanks.... The two slots that have the white paper with red arrows is located on the back side of our supercharger. These can be seen after removing the throttle body snout. These two slots have a 3/16" hole thats drilled 8" deep into the supercharger's body. The two holes reach all the way into the plate that has two unused large threaded holes on the top side. This plate with two large threaded holes is located close by our clutch. Not knowing the purpose of these small 8" deep holes,I didn't want to have them welded shut. They may be some kind of vent for the oil?? So I lifted my tab to be welded in a 1/16 of a inch. The small deep holes are still open but have a tab with a gap over them to breath at a 90 degree angle now if necessary. I cut two strips of paper with arrows,then slid them between the welded tab and the supercharger body to show the vented gap for a picture. Squirrel Crusher

 

Still liking the mod? Any video of the sound?

 

The purpose of those 2 holes is for pulling the complete motor out of the car with the 2 tabs on either side in back and the 2 bolts with cradle attached to the front on the s/c. I was happy to have them to use as MB designed this car/engine/platform with lots of serviceability in mind. I have a friend that worked at the MB dealership and asked him after the first time I pulled my engine and he told me about the cradle and bolts to use for the balance to pull with the complete motor out. Much easier and can pull engine and tranny still bolted together easy peasy with the adjustable engine positioning block.