SM Head Modifications on a budget
The cardiac kids of TN Vols baseball kept me up too late last night so not much testing this morning. I was able to do the first round of head bolt bulge reduction. After careful consideration of the tools available in the picture, I chose a 1/2" diameter 36 grit cartridge roll for this job. Spent about 5 minutes working the bulge, mostly from the intake side. Working from this side is totally safe - not much can go wrong. After removing about half of the bulge, I flipped the head over and worked the back side of the bulge from the chamber side. Working from this side is a little more tedious because the cartridge roll could easily get into the short side turn and the 1/4" shaft can bang the seat. Pictures of the port are after working the head bolt bulge.
Results as shown. Nice little 2-2.5 cfm gain before flow separation rears its ugly head.
Continue on with full removal of the bulge?
The cardiac kids of TN Vols baseball kept me up too late last night so not much testing this morning. I was able to do the first round of head bolt bulge reduction. After careful consideration of the tools available in the picture, I chose a 1/2" diameter 36 grit cartridge roll for this job. Spent about 5 minutes working the bulge, mostly from the intake side. Working from this side is totally safe - not much can go wrong. After removing about half of the bulge, I flipped the head over and worked the back side of the bulge from the chamber side. Working from this side is a little more tedious because the cartridge roll could easily get into the short side turn and the 1/4" shaft can bang the seat. Pictures of the port are after working the head bolt bulge.
Results as shown. Nice little 2-2.5 cfm gain before flow separation rears its ugly head.
Continue on with full removal of the bulge?