| Re: New LTX running well but..... |
Subject: Re: New LTX running well but..... by rklessdriver on 2008/10/27 1:54:02 Crusin- He turned it 7000rpm on the chassis dyno. It never floated the vlaves and it pulls cleanly above 6000rpm it just quits making power above that. No holes in the tuning as the rev limiter is set to 7200rpm. With the rev kit it went 7400 on the engine dyno before I shut it down. It was out of power by 7200 (HP peaked at 6800) but it didn't float the valves at 7400, so I called it a day. I was as surprised as heck when Ed called me and told me it was making great power (440RWHP)but it wouldn't pull past 6000rpm. Since I had so may problems with valve springs making RPM on these lobes (very aggressive with an inverse flank)when I first put the motor together, I pretty much knew this was some more of the same. We wasted 3 dyno sessions during development time getting it to make the power I wanted. I thought I had it solved on the last one but I guess not. At this point I'd be happy with it just making power to 6800RPM. Should be easy to do that but with theses cam lobes I got maybe not.... There's so many possibilities as to what could be wrong. When I first got the motor in the car, it was super rich on the stock tune. I didn't run it much more than idle it for some pics, and on and off the trailer to Eds. Even thou I changed the oil before I took it to Ed (and it was full of fuel)the new oil looks pretty bad after the chassis dyno session must have been a lot more gas left in there. The internal valving in the lifters could have been damaged by the gas in the oil. The internal valving in the lifters could have been damaged by all the valve float problems I had in the development period and they finally gave up. I got a bunch of spring on it and a combination of factors above collasped the lifters and they are not comming back. Like I said I got a few things to do before I take it back apart. I should have my valve covers fixed by next week and then I'm going to try some fluching the oil system and running some different oils. If none of that gains the power back up over 6000RPM, then I'm going to change the springs. If that don't fix it I'm going to change the lifters. If that sson't fix it... I'm going to have to make a descision. Mech roller or milder hyd roller. Pr0zac- No it's Billy Williams. But like everything in the Marine Corps things get butchered and for the past 12yrs my name has been "Will". Even thou I've been out a year and a half I still answer to it. TPI-guy- The cam is a custom grind from Mike Jones (Jones Cam Designs). 288/292@.006 242/246@.050 .620/.620 (1/7/1.7) 106IC/110LS. other engine specs 382 cubic inches 10.6 SCR 43lb pendlum undercut 4340 crank (3.75 stroke) 545gr Scat Q lite 4340 H beam Rods (6.0") 398gr 2618 Weisco pistons (4.030)w/99gr tool steel pins AFR 210 Elims CNC comp port T&D Shaft Mount rocker system Morel lifters Hydra Rev Converted Victor 2925 58TB w/36lb injectors Will |
