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Originally Posted by pgfpro
This weekend I'm going to start on my second version of my single intake opening valve system with solid lifters. I built a very simple system that holds four of the intake lifters in place with no rocker arms on them, this keeps them from popping out under hydraulic oil pressure. So now I have a single intake valve per-cylinder to promote swirl for ultra lean burn operation. This will also help with engine delt p by increasing intake boost pressure from a more restrictive valve area.
The only downside to this is the fact when I want full maximum performance I will have to pull the valve cover and remove the lifter holders, and put the rockers back on. I will also be experimenting with the exhaust valves also.
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Quote:
Originally Posted by pgfpro
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.  |
This is too cool Russell! I have been contemplating valve deletes in the Escort. I read up on a thread that EM member Gasoline Fumes started about deleting valves in his Honda Wagon and saw the improvements he had. Like you, I have also read up on the effects of tumble vs. swirl, and swirl wins out hands down.
I have to get extra cams and ground off a lobe (DOHC 16v engine). Direct cam-to-lifter cantact is a more efficient design, but messed me up with this task
Let me know how the exhaust valve deletes go. I do want to do this, but am curious to the effects. Keep up the awesome work, my friend
