(25-08-2014, 11:55 AM)Ruan Wrote: Absolutely love it!!! Massive tractor pulling fan - this is right up my street!
With regards to the problem with the oil film before 45BTDC - I'm surprised you're having as many problems, although cylinder pressures will be much higher, the ignition delay of Diesel surely isn't really starting to generate high cylinder pressures until a few degrees later?
You may want to look into DLC (Diamond-Like Carbon) coatings for the bearing surfaces which may allow you to get the fuel in a little bit earlier. Though as far as I'm aware, the XUD11 cranks are no better in terms of oiling holes, not to mention your rods wouldn't work with the crank since they're a wider crank journal width.
I'd be very interested to see what you've done with the valvetrain to hold it together at 500kPa and 7000+rpm!
We can see the hole is a problem since it leaves a ferm impression on the bearing, how, what or why is not clear but the damage is there after one 10 second run, if other types use the same place we have to look for a way to plug the original one and drill another. (and thereby making it weaker)
The wider journal width is only 2mm (4mm stroke) so I can grind that away from the casting, no problem. (4mm for a DW12 would be more problematic)
The valve train is completely stock however I do have a dry sump turbo oil system so al of the pump capacity is used for the engine.
We use the ultimate road cam from piper cams, to our knowledge the fastest thing there is for these engines, if some of you know a more cruel cam please let me know!
Coatings do scare me, never seen wonders from it, only damage if it gets loose.
If you want some pics guys:
Yesterday:
https://picasaweb.google.com/minimumrisk...0189572578
(my 19 year old female driver did forget to give full throttle first piece but we ended up 2th)
https://picasaweb.google.com/minimumrisk...3978850034
My friend got 1st (but probably melted his 4th set of pistons this year, he uses stock not billet)
https://picasaweb.google.com/minimumrisk...1083445154
more stuff in our web album: https://picasaweb.google.com/minimumrisk.pulling.team
