Wednesday, September 01, 2010

head work...

still remember the ported cylinder head I'm using previously??... the ports are rugged and no polishing job was done to the surface... the valve guides were also badly ported, which might allow the valves to vibrate under high engine revolutions...





finally after 4 months sending my cylinder head to workshop for port and polish job, it has finally returned... but with just the porting job done...





i DIY'ed polished the cylinder head valve throats with some sand paper and autosol... did some shopping for new top set kit, viton valve seal, timing belt kit, water pump and other necessary fluids...





head swapping was done at workshop... left my car there for a day and got it back the following day... what makes this newly ported and polished cylinder head different compare with the old one, the engine revs up more smoothly... there is no minor jerks and hesitation which i experienced with the old cylinder head setup... however, the downside i lost a little bit of throttle response and torque... this is probably because the cylinder head was not ported big enough...

my mechanic also overtightened the aircond compressor belt, causing very high pitch screeching sound... crankpulley and emitting strange grinding noise... most probably due to improper installation... always remember, do not take your attention away from your car when it is at the workshop... u'll never be sure your mechanic did the right thing... or he might had passed the job to his junior to handle...

overall was not very satisfied on the performance... but i gained precious knowledge and experience trying to assemble/dismantle the valvetrain and porting and polishing it... i dont think i will be taking it out and redo the port work again anytime soon...

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