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I think that, despite the appearances, my belief is that there's not going to be a huge, game-changing difference in flow resistance in an actually running engine. Maybe the new ones are a little bit better because of the longer radius bends. But the old, hand fabricated manifolds are pretty good, too.
There should be a meaningful improvement in keeping the pulses separate longer.
The fabrication hours will be cut down dramatically, however. And the castings look money!
Some people have asked me about the runner sizes and post-op machining steps.
Quoting John:
[Runner entries] are cast undersized right at the opening such that they can be profile machined open to be port matched to the head. I may also slightly bevel to account for thermal expansion. They will match the ports for sure.
It's absolutely critical that there be additional material for machining as you have to allow for coverage to compensate for shrinkage, warpage, etc. Since it's cast you have to post-op it. On the part, we added +2mm to all surfaces for post machine operations.
See the hole [in the below picture] right now is smaller than the tube, but just at the flange...this will be post-opped to be port matched to the head.
Here's why you add material...[below picture] this is the last hole with the sheet metal template being matched up. As you can see the casting is not perfect, but we know this going in so we added material to allow this to be opened up and matched to match. Each port hole will be profile machined "profiled" to the exact port spacing and size...there will also be some minor blending of the surfaces done by hand.
Now that the Greco-European clown show is on intermission, I am on the plane to Italy, specifically the island of Ponza via da Vinci airport. Been a busy first half of the year observing the political genius of Mr. Tsipras, and trading accordingly.
By a total coincidence, I might actually fly over my new daily driver that is crossing the Atlantic in the opposite direction. My 2016 AMG S65 Coupe is on board of Aniara on the way to Baltimore:
Twin Turbo 928 fixed and back out there terrorizing the streets!
Originally Posted by ptuomov
Now that the Greco-European clown show is on intermission, I am on the plane to Italy, specifically the island of Ponza via da Vinci airport. Been a busy first half of the year observing the political genius of Mr. Tsipras, and trading accordingly.
By a total coincidence, I might actually fly over my new daily driver that is crossing the Atlantic in the opposite direction. My 2016 AMG S65 Coupe is on board of Aniara on the way to Baltimore:
The CL 65 AMG is a great car! Congrats! We were playing tag with the F12, and it came down to whose pedal toe was quickest to the throttle in the roll on from 80 - 190 it is just as fast as the Fezza. Granted it was tweaked by Hartmutt at Renntech.. Quite the Q-ship that one!
Now that the Greco-European clown show is on intermission, I am on the plane to Italy, specifically the island of Ponza via da Vinci airport. Been a busy first half of the year observing the political genius of Mr. Tsipras, and trading accordingly.
By a total coincidence, I might actually fly over my new daily driver that is crossing the Atlantic in the opposite direction. My 2016 AMG S65 Coupe is on board of Aniara on the way to Baltimore:
From the Vessel Particulars I can see the homeport of the Aniara is Stockholm and it is carrying a Swedish Flag which is good. Most ships nowadays are flagged out to low cost countries. Tuomo has now reached a certain age allowing him to own a Mercedes which in Germany is designated as "Ein Auto für alte Männer" (a car for elderly men). I wish Tuomo all the best with the new car and hope the Boston police won´t stop him for speeding.
Åke
Last edited by Strosek Ultra; 07-11-2015 at 12:11 PM.
The MBC option (which is not available on S63C) is supposed to allow me to drive over speed bumps without slowing down or spilling my coffee. We'll see.
Originally Posted by Mark Anderson
I love the new S coupe but I'm curious your choice of the 65 over the 63 . I know the 65 has a higher potential but there is the weight penalty
Damn. That's a lot of work right there! Who is financing all of this??? Those rapid prototyped patterns still have to cost a pretty penny...
Between CAD work, John's time, foundry fees, tooling engineering, etc, there is over $10K right there not including the cost of the first parts. The whole investment made by John's firm. I am just paying for the parts I am buying.
07-09-2015, 03:38 PM
Which one do you think will flow better?
