ported my 318 heads
just to come around to show the FABO gearheads the result of several hours spended to port and polish my 318 heads.
due to the reason, that swirl-port, or magnum heads are not so easy and cheap to find in Germany (no way to find them on junkyards...)
i decided (together with a good friend and helping mind of me - he is an graduated engineer (espec. aerodynamic properties) ) to stay with a pair of stock 318 heads out of 1969
the pics are not really the best, but i guess the show a little of what was done.
the first 2 pics show how i tried to get the valve guide boss smooth and narrow.
also i grinded the walls of the bowl and tried to get a smooth surface and eliminate the ridges, i have taken about 0.05 to 0.07 at the walls and about 0.08 to 0.1 at the bowl left an right side of the boss down to the runner. The runners are opend up to match a RPM-performer intake, and smoothed out as far as i dared to deburr on the pushrod holes. Actually the runner ended up being about 0.08 to 0.1 larger measured between the side wall and the wall of the pushrod hole. From top to bottom i could achieve 0.16 to 0.18
also a point was to eliminate the "air flow break-away edge" on the short runnerside of the bowl to create a better and faster transition
due to the fact - that we decided to stay with the smaller valves, we didn´t take so much material from the bowl itself, just to make sure the bowl wouldn´t get to big compared to the flow-capacity of the valves.
conc. the exhaust side we only made a little bit of polishing to smooth out all the surfaced and making the runners only 0.1 wider
hope you enjoy - what you can see - awaiting your comments
and please dont be so "harsh" when you judge my work - these are the first heads i have done :yawinkle:
just to come around to show the FABO gearheads the result of several hours spended to port and polish my 318 heads.
due to the reason, that swirl-port, or magnum heads are not so easy and cheap to find in Germany (no way to find them on junkyards...)
i decided (together with a good friend and helping mind of me - he is an graduated engineer (espec. aerodynamic properties) ) to stay with a pair of stock 318 heads out of 1969
the pics are not really the best, but i guess the show a little of what was done.
the first 2 pics show how i tried to get the valve guide boss smooth and narrow.
also i grinded the walls of the bowl and tried to get a smooth surface and eliminate the ridges, i have taken about 0.05 to 0.07 at the walls and about 0.08 to 0.1 at the bowl left an right side of the boss down to the runner. The runners are opend up to match a RPM-performer intake, and smoothed out as far as i dared to deburr on the pushrod holes. Actually the runner ended up being about 0.08 to 0.1 larger measured between the side wall and the wall of the pushrod hole. From top to bottom i could achieve 0.16 to 0.18
also a point was to eliminate the "air flow break-away edge" on the short runnerside of the bowl to create a better and faster transition
due to the fact - that we decided to stay with the smaller valves, we didn´t take so much material from the bowl itself, just to make sure the bowl wouldn´t get to big compared to the flow-capacity of the valves.
conc. the exhaust side we only made a little bit of polishing to smooth out all the surfaced and making the runners only 0.1 wider
hope you enjoy - what you can see - awaiting your comments
and please dont be so "harsh" when you judge my work - these are the first heads i have done :yawinkle: