As many know we built a twin turbo with the guidance of Mark Unchained. Got it going late in the season last year. Made way too much power. I was told it would by Mark and Hass. Had a few problems and eventually kept it in one piece.
Spit the belt driven fuel pump drive out one day testing. It lean popped but seemed OK. Had low boost one test session and found a silicon coupling was blowing loose under boost. lol. Lost oil pressure one day testing and found the crank had flexed hard enough to knock the oil pump loose. Had clearanced the pump to clear the crank during assembly. Caps had walked pretty hard. Changed the bearings and took some timing out. Put one piston in the lathe and opened up the ring grrove where it had pinched rings a bit.
Missed the race we were trying to get to.
Got it going again. It ran so hard almost blew it over testing. Killed another set of bearings. Missed another race. Caps walking pretty bad. Crank was not pretty Our friend and Shazam CC Mike Boyce said it has to be timing. Crap we are running methanol 9.4 compression and only have 33 degrees of timing. Called Brodix and they confirmed 31 degrees max with the Head Hunter heads.
Decision time. Wanting to get to the World Finals. Asked Info Jr. what does he want to do? All we have time to do is roll in another set of bearings and back the timing off. We decided to go for it. Make a few passes and check the oil filter. If it's good keep going, if it's ugly pack it up and bring it home in one piece
Set the timing to 27 degrees went to the WF made a couple really good passes. Checked the oil filter and it was ugly. Has to be an oiling issue.
Brought it home and didnt touch it all winter. Pulled the engine a couple of weeks ago. It had only killed the rear main bearing. Everything else looked great. As it turns out the rear main on the crank was not happy and the block line hone on the rear main was not either.
Analysis. Damaged it with too much timing. Did not have it apart the last time to find out the crank and block was not happy.
Just set the engine back in the boat yesterday. Ground the crank and line honed the block. Put a Titan oil pump on it. Thanks Steven Gearhead. New piston for the one we repaired. Should last all season this year.
Current challenge: getting control of the boost.
Couple pics of upgrades. Oil pump and bigger oil lines going to the Oberg filter. Moved the corner of the oil pan out to clear the pump. Very lucky it was so simple. Info Jr. getting the boat ready to drop it in.