Well my buddy finally got a chance to tear down the VE motor. Ill start off by saying the motor was in my buddies 200sx for 2+ years and close to 50k miles put on it of pretty hard abuse. Motor saw 11k+rpm a couple times because of mis shift and no rev limiter. But with the n1 cams it still wasnt enough to float the valves into the pistons as there is no sign of any P2V contact at all. I was releived to hear that.
Second of all, the motor for the first year and a half just had a base VE n1 cam tune on it and had a ton of detonation down in the low to mid range heavy load so Id imagine thats where all the damage on the pistons and block came from. I didnt get it on the dyno to really start tuning it until the last 6 months that it was in the car. On the dyno when we did the base pull it had to be stopped because WOT from mid to high end was running almost 14.7-15.0:1 a/f ratio. Not good at all. Richened it up to 12.8:1 or so and it picked up a lot of power just doing that and then bringing in some more timing. After that the plugs and all checked out fine with no signs of detonation. Got rid of the low and mid range heavy pinging completely. But obviously the damage was done as the pistons and edges of the block between the firing ring and cylinder wall have pitting. Not deep but still there. Luckily I dont care because its getting sleeved.
Here are some pics:
The stuff on the tops of the pistons is just carbon buildup, for the most part the pistons are pretty smooth except for the very edges of them.
Next thing is I had him see the difference between the DE flange and the ve ports. Its quite obvious that the de ports are larger. From what people have said it was a positioning thing but its quite apparent that the ve ports are smaller than the de ports. Here is the gasket matched to my turbo manifold, you can see the gasket lines up very very well with the ports.
Here is the same gasket on the ve head. You can see the top and sides of the port till about halfway down match up perfectly but the bottom half of the port stops short of filling up the gasket area.
I think Im just going to port match the VE head to the gasket which is not a whole lot of material but should open up the port quite well. Other than that ill be leaving my flange as the de flange and it should be perfectly matched to the ve port once opened up. Gonna clean up some of the ports on the manifold as well, but nothing major.
The block is getting shined up tomorrow and boxed up and ready to ship to Mazworx. Hopefully by the end of the year Ill have my sleeved stepped deck Mazworx block with 1/2" machined headstud holes back ready to get assembled when I get back. Marry Christmas Ashton. lol
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