Hey guys.. getting a lot of PMs wanting to know whats going on.
I was going to wait until I had some pictures to explain everything, but that won't be until tomorrow at the earliest. I had to go buy a right angle adapter for my dremel..
Add to that a plastic welder, and we have a nice smelly low budget project going on.
First up is the simple thing I was surprised about.
The manifold I am using for my project is like new, came off a very low mileage car. While I was working on it the other night, I stuck my finger in it to wipe away some shavings and I discovered the changeover valve doesn't line up!!
It is off enough that it makes a lip on one side and a drop off on the other .. factor in both openings on the rod and and the pulses moving back and forth and you have 4 spots on EACH runner that disrupt airflow.
Should be easy enough for me to measure how far off it is and shim it.
Now on to part 2- (the actual modification that I am hoping will make a difference.)
What are the 2 main things that effect where the power is tuned on an intake manifold?
Runner length and runner diameter.
I can't do anything with the stock manifold about runner diameter.. but I can about the runner length. Look in the resonance port. I can shorten the 'high speed' runners roughly an inch 'just' by grinding them away. Should kick the peak power up 500rpm or so.