Quote:
Originally Posted by g300d
Nice work!
Will the 4.6 cams on the 4.4 need a tune?
I didnt know these motors have cracked connecting rods.
Interesting on the ring deposits, are the M62's prone to them? I was thinking of trying Valvoline Restore and Protect just because there is a lot of evidence they clean so well. No oil consumption on the 4.6 and it was spotless under the valve cover last time the gaskets was done though.
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I'm sure it would run on the 4.4 DME load, but I'm planning on using a the 4.6 DME (or a DME updated to 4.6 software) as a place to start. The added 50 or 60hp that the M62TUB46 delivers seems come from the cams primarily. .2 L displacement can't be responsible for too much at all. The 4.6 DME load will have the specific tables for these cams.
I'd like to find a place that can run it on a test stand to break it in and make sure it doesn't come apart in some way due to shoddy workmanship. And since I'm leaning towards building my first track car around it, they could ideally develop a tune for it. I'm guessing it will make 310 to 320 HP-ish with the 4.6 cams in it, but that is just a guess. Partee Racing in Virginia specializes in the S62 and has a test stand set up for that motor, which should use the same bell housing as the M62 (I think). They do S62 tuning so I suspect the M62 wouldn't be a stretch for them.
It's tough to say when and why all the carbon came from, nor how much it was affecting the compression on each cylinder, or if my M62 build up was unusual at 155k when it came out of the X5. After the heads were replaced under warranty at 20k miles,, the motor never burnt much oil at all until very late in its tenure in my E53 when I also think it began loosing compression on 4, 6 and 8. These 3 cylinders were sitting at 160ish PSI, while the other 5 were at or above 175ish. The carbon was pretty uniformly deposited across all 8 though - heavy on the tops and ring groves. The heads and valves however, looked pretty good.
As far as the rods go, I think they are sintered which makes a strong rod and is good for mass production, but my machine shop said that cracking the caps off is done just to save money and mass produce them. The videos on line of rod caps being cracked off are pretty cool to watch.