Quote:
Originally Posted by Malekreza11
Robert is right, hand porting this motor will most likely result in no gains or loss of power gains and disrupt the VE. The head is already ported pretty aggressively from the factory and the CNC marks also lead to a better control of the air flow since they are parallel with the flow.
Like many have said, detonation could be the cause, but if that was the case, where is the damage to the valves and head itself? I have seen engine damage from detonation first hand many times along with a poorly balanced motor from the factory. To me it looks like it was off balance. This must be considered because the shop rebuilding his motor even said the crank is off balance.
Yes it's possible that the detonation through the balance of the crank off, but it would be to be very severe detonation for that to have happened, and nothing in the cylinder chamber or head show that. Your spark plug may have grown closer together because of the misfiring your motor is producing to begin with and distorted the tip. If those piston pieces would have flown around in your combustion chamber, your block would be near unrepairable right now.
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I agree that the factory intakes are already very well ported seeing his RD progress thread. Well he is not done with the polishing the intake valves after the porting so we'll see how it looks like after that is done. I will post some pics here once that is done.
Regarding the valves, a few of them were warped and had to be changed. The rest were vacuum tested and they were absolutely fine. The cylinder head took some slight damage but it did not warp the heads or anything like that. It was cleaned up and there was some marks but they were slightly grinded off. These marks were basically foreign objects from the pieces of the piston which was damaged.
He remarked that the off balance of the crank by 1.3kgs was probably to do with the balancing at factory and at this margin of error, he was particularly surprised at such tolerance. The crank was not damaged at all from whatever happened in the cylinders but the bearings were in such a state that if I had not sent it in time, the block would be rendered unfixable once it eats through the bearings and it would be impossible to repair it.
The piston pieces damaged and scurred my cylinder walls heavily but since it was going to be bored out anyway to fit the liners, then it wouldn't be a big deal. The thruster bearings had an unusually amount of uneven wear and tear which exacerbated the wear on the other bearings holding the crank. If you look at the photos carefully, you will know what I mean.
