Quote:
Originally Posted by Daox
Hmm, quite interesting. I look forward to hearing how this turns out.
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Thanks Daox for the interest.
The way I set my engine up now is I have taking around .200 off the bottom of four HLA intake lifters. When you remove around .190 you open up a small hole in the center of the lifter. This will collapse the lifter, but its enough to still maintain some pressure on the rocker to keep it from falling off. The intake valves with this modification still come off their seats by about 20% as normal. The downside its noisy but my Tilton pump drowns out the lifter noise so its not to bad.
This first version was just a pretest to see if swirl would help reach a more efficient combustion. It was definitely a major improvement. Swirl is by far more advantageous then tumble on a pent roof 4 valve head from all the reading I have done on this subject and now have seen i first hand.
What I found on my own experimenting is I now can run less timing for the same power output. This is a sign that BSFC has improved, and the fuel values show it.
