Rzr has 970 miles on it with just a stage 5 trinity exhaust and canned Pvcx trinity tune. Iíve been working with Mike at Aftermarket Assassins to make a few improvements. Ended up purchasing 2018 head gasket, new head bolts, from OEM vendor, did DIY oil cooler mod, and RZRjoesí BOV done right mod. Purchased 2017 injectors, low temp spark plugs, and tunes 3, 3.5, 4 and s3 clutch kit with performance helix from Mike. 3 being safe pump gas tune, 3.5 being possible with good pump gas but on the edge and 4 98-100 octane.
Not looking to bash anyone with this thread but looking to find answers and see what failed. I have experience building motors for turboíd tuned import street cars. I have also rebuilt my old 2014 XP1000 at 1,900 mile with no problems. I donít take shortcuts and used OEM manual for head work and everything torques to spec. Before work began everything was cleaned and bed was removed. Any pause in work and everything was covered and protected form FOD and was reinspected before it went back together. Project went smooth nothing was rushed and no leftover parts.
Replaced head gasket, bolts, injectors, spark plugs, clutch kit. Installed oil cooler and BOV, verified timing twice. Loaded stage 3 (pump gas) tune (This is the only tune I have loaded so far). Put clutch kit to recommended weights for tune and 32s. Did vacuum test on BOV mine was .375 instead of rzrJoes' .400. Bled coolant and oil systems, verified BOV/diverter was working correctly, insured clutch was performing correctly at idle.
Did a couple of pulls to insure clutching was working properly and engine temps were stable. Clutching was close Ran it 20 miles on dirt and paved roads, then checking timing again along with coolant and oil levels. Clutch was still running a little hot but that was the case before work was done, it was staying cooler than before, just not where i thought it should be yet. Car was running good, felt a little slower then previous tune and clutch off the line but then would pull strong, figure this was due to not dialing in the clutch yet. Only did one Wide open pull on a road, rest of it was pretty tame between 20-50mph making sure everything was working properly.
Took the car out for another 20 mile run on dirt and paved roads. Driving about 40mph and boom pssssss and died. Wasnít sure what was wrong at this point, and called my wife for a tow. Got it home and have broken spark plug, ruined head, damaged cylinder walls, broken piston. I have not taken it apart yet as I was waiting to see what Mike wanted me to do, damage has been verified with a cheap borescope.
No leaks through this entire process, head bolts and gaskets are still fine with no leaks. No increase in temps at any point and no crazy boost spikes, no miss fires, no hard starting, no engine stumbling, verified timing again and still in.
Open to any ideas and requests for additional pictures to help determine cause.
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