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Originally Posted by Dragonwind
I think the biggest one for me, and despite the respect I have for Jake, is the lifters issue. At first he claimed it was robbing power, now in another post he mentions it is fuel economy and no car dyno'ed gave more than 1hp gain. My mechanic who has rebuilt many a M96 motor hasn't seen these problems. And if it were MPG then why does my 99 still get the same MPG that it was rated for 10 years ago with 89k on the OD (and I keep her in the high revs)?
Chris
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Like I said, there are no blanket statements that can be made with these engines and their issues. Some cars that have lifter issues make much more power after they are remedied.. Others lose MPG but never really lose power, and some engines make more power from the factory than others.
It has a lot to do with how many lifters are bad and if they are on the intake or exhaust valves.
What I said was:
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I recently had a car show up here with 22 of 24 lifters bad, after our work the MPG jumped up 5 MPG, but the power didn't change more than 1HP and 1.5% average torque.
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Note that is ONE instance with one car. Some engines that we do this work to do pick up power, I have seen as much as 6HP and 11 lb/ft of torque but the biggest difference is the torque and HP plots and their smoothness. In a lot of instances the average power output is increased across the board, not just at peak output and the dip at the variocam changeover point is greatly reduced with the lifter upgrade.
If you have decent gas mileage and decent power don't worry about the lifters... They'll never fail and leave you on the side of the road.