Porting 4A-GE 20v Head
Late September 2003
LOO YOKE LEONG (Ah Leong) 012-6516869
DU CAR SERVICES SDN BHD (568089-W)
122, Jalan SS21/35, Damansara Utama
47400 Petaling Jaya, Sel
Tel : +60(3)7725-0107
Fax : +60(3)7727-5791
2 months after the head is removed from the block, then port and polish begins :( so much for efficiency hahahahaha.
Pictorial record of valve seats' condition before porting: -
Cylinder Intake and Exhaust Valves' seats: -
Cylinder 2 Intake and Exhaust Valves' seats: -
Cylinder 3 Intake and Exhaust Valves' seats: -
Cylinder 4 Intake and Exhaust Valves' seats: -
Before we start we went to
to buy some tools: -
But something is not right. The grind bit cannot fit into the air-compressor's spinner hence an adaptor mount was bought from a nearby DIY hardware shop near the workshop.
A torch light was also bought, can't believe it is needed in broad day light. Bill sure knows in this case.
While Bill and Yoga was busy porting the head, taking pictures etc. I took the time to remove the brake proportioning valve bias for the rear in hope to improve rear braking as advice by Bill. Please see Rear Brakes Efficiency.
Since doing that require the removal of the intake plenum, therefore the plenum is worked on whatever little that I can in hope to improve air flow: -
ACOUSTICS SECTION AUDIO SECTION CAR SECTION
HOME - Technical Website for Acoustics, Audio and Car