Unless the Huma OD is slightly larger, I didn't see anything special about them other than the square hole.
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I got the power plenum installed. A few shots over the chrono shows an increase of 60 FPS to 960 with the MKIIs. This is with same 150 SP, and with either max or min on power wheel.
I used the old valve spring captured within the PP. I had to use the old HS (hammer spring) spacer to block the long valve spring from going down into the front port of the plenum, which worked out great. I used the old HS, which was about a 1/4" longer than the new HS. The spring rates seemed about the same to me. I also used the same rubber valve cap.
I got the power plenum installed. A few shots over the chrono shows an increase of 60 FPS to 960 with the MKIIs. This is with same 150 SP, and with either max or min on power wheel.
I used the old valve spring captured within the PP. I had to use the old HS (hammer spring) spacer to block the long valve spring from going down into the front port of the plenum, which worked out great. I used the old HS, which was about a 1/4" longer than the new HS. The spring rates seemed about the same to me. I also used the same rubber valve cap.
Recipe for HEAT! Try dropping the reg to 120 or less i bet the numbers wont change much
My hat's off to ya Nathan! Here is an icy cold mug of Molson Lager for you in appreciation of your most excellent results!
All the best to ya, Chuck
With the hammerweight in there and a lower reg pressure yeah can turn the little hammer spring set screw way down. The weight adds preload on its own don't forget.
Glad you're loving it enjoy the process
I wound up just installing the new valve spring and cap on the new PP upgrade. I left the old, long valve spring still in the plenum, I can control the valve spring more now, plus I can remove the new valve spring and go back with the rubber ball cap easily, too. No chrono numbers yet, but shooting very strong, snappy and quiet still. I should have the Huma dual ports soon.