507 WHP, 88 civic hatchback
Discussion Starter · #1 ·
OK everyone i am at the a complete loss with my rebuilt d16z6. i am on my second set of bearing in this particular engine. i believe the first set died because i didn't clean out the girdle good enough after i ground it down to accommodate the custom length rods. fair enough i tore everything down cleaned more thoroughly and replaced the oil pump and oil pan. i took the crank to my machinist and had him inspect it to be sure i caught the failing bearings early enough. he micro polished it and said everything was in spec. so i put it back together with some acl over sized race bearings with a moderate amount of assembly lube, and dropped it into the car. i unkooked the dizzy and spun the engine over to prime the oil. but when i started it i had no oil pressure. within 10 seconds of startup i shut it down and left it till the next day. again the followeing day i did the same thing and nothing. so now im looking at no more than 20 seconds of run time. at this point i take the plugs out and spin the engine for several minutes. i finally get it to prime by feeding oil into the block at the oil filter and fire it up. now im looking at 85 psi of oil pressure cold and 15 to 20 once its warm running 20w50 with zinc breakin additive. i let it run for 30 minutes and drain the oil and swap the filter. i do this twice more but i run it for an hour trying to flush anything i might have missed from the first set of failed bearings. by the third oil change i notice my oil pressure is stuck at 100 psi even after warm up. (first two were 20ish once warm) so i pull the girdle and notice lots of wear on the new bearings and lots of flakes that must be from the bearing in the oil. what i want to ask is this caused by running the engine without oil for those 20ish seconds or do i need to look for other causes. total run time is 3ish hours.