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Hey, I was just siftin' through this thread. That's a cool build you're doing. I didn't read all the posts but I was wondering if you tossed out the cracked cases or if they'd be available for sale. I have half an EVO case (primary side not cam side), so I'd be interested in purchasing at least the non cam side if you still have it. I can do paypal too. Sorry to bug if they're already gone.
PM replied. Sorry bud, they're in a San Diego county landfill somewhere by now.
I was shown early on that I can just upload right to the thread using HD Forums uploading service. No 3rd party needed, but thank you for your suggestion.
Back in the day forums didn't do this, now apparently they do.
Had a REALLY good chat with Ron at Axtell yesterday. Long story short, oil pump issues. I'm not sure if you're familiar with how the Evo distributes oil but he's had this issue with hot Evo engines that use the S&S HVHP oil pump. I'm not the first Axtell cylindered Evo with that HVHP oil pump who's smoked pistons. He went back and forth with S&S back when that oil pump came out and finally got out of S&S that the HVHP pump is designed for their Special Application cases that come with piston oil jets under the pistons to keep them lubed and cooled. The standard Evo case (which I have even though it's S&S as well) does NOT come with piston oilers, therefore (in conjunction with the larger scavenge side of the HVHP pump) the use of the HVHP pump is basically starving my bottom end for oil causing the overheating pistons and scuffing. He said there's a way to machine the HVHP pump to make it more like the OEM pump so I'm gonna do some comparing between the two (I have both right now) and see if that's something I wanna tackle.
Oh, to the person who asked me of the cylinder composition, 40,000 psi ductile cast iron from a foundry somewhere local to him in Iowa.
So you're saying that the scavenging is so good that you're not getting the normal oil bath lubrication you would from the wheels slinging oil up onto the cylinder walls which in turn is causing poor lubrication (cooling) to the skirts and walls creating high heat and excessive thermal expansion.....
So you're saying that the scavenging is so good that you're not getting the normal oil bath lubrication you would from the wheels slinging oil up onto the cylinder walls which in turn is causing poor lubrication (cooling) to the skirts and walls creating high heat and excessive thermal expansion.....
Yes
In conjunction with the shitty oil passage going into the pinion shaft. Basically the oil passage is the thickness of the gasket and about 1/8" wide. Here's an illustration of this location (it's the pic I emailed to Ron for confirmation):
If you compare that passage to the OEM pump you'll notice it's machined all the way down to that lower hole. According to S&S, the HVHP pump is designed to work with the SA cases (which also have piston oilers) so that narrow passage is plenty for oiling the pinion.
Hand milled the passage after drilling a few holes with my Dremel
Rear cylinder was a bit harder than the first. I had to scoot the oiler forward more than intended due to complexity getting oil to it. Mill made quick work of it.
Both pointing towards the rear of each cylinder.
Notch out the cylinder skirts to make room
And the piston as low as it will go to check for clearance there too
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