my cam adjusting experance

[rusty4g]

i took my car to the dyno the other day. barring in mind all i have done is bolted a set of dual carbs from a d14 to a d16z6 with a set of trumpets, a 4-2-1 manifold and a 2.25" full exhaust system. it had a dwell after 1/4 throttle and could not work out why. it made 118 bhp. if i am honest i was expecting more so i started scratching my head on things that will improve it. the first thing i looked at was my cam timing and found that my valves were not opening and closing at the rite time. the exhaust valves were staying open after the piston had started making its way back down the stroke and the inlets were not opening early enough. i spent about half an hour studying the valve opening and closing timing and found that my cam was 6 degrees retard from its best setting. so i adjusted the cam so the inlets started to open as soon as the piston reached top dead (10 degrees before top dead on the crank) and the exhausts were closed as soon as the piston started to make its way back down the stroke (10 degrees after top dead on the crank). there is 20 degrees of crank movement where the piston is at top dead/not moving. when i drove the car after making these changes the engine ran much smother and feels more powerful. the dwell i had has disappeared and now pulls harder in vtec this could have been caused by head skimming as i don't know the history of the engine. so i am hoping for some better results at the dyno next time.

[bryan]

118bhp is a fairly good figure considering you hadn't set it up iirc gizmo's EF2 made a similar figure on its first dyno run

[Gizmo]

119bhp

[bryan]

close enough

[rusty4g]

looking at it in that way it was rather good then. i just hope with my changes i can get more out of it. what did gizmo get on the second run?

[bryan]

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[rusty4g]

i still think i can get more from my engine but a bit happier now i no that this is roughly what they make

[pikey-pete]

my setup made 117.8 haha

d14a1
z6 30 thou skim
diy port polish
standard carbs with bike filters

[rusty4g]

fair shout thats good

[joe f]

Mine only made 113.5

Stock z6, full exhaust, stock carbs with trumpets.

[Gizmo]

Mileage on the engines used?

Mine had 100k IIRC

[rusty4g]

about 200k. was on 180k when i took it out the del sol and i have now been running it for about 7 months. been round the world a few times lol

[rallyeluke]

My 1616 made 145.9 Bhp

[rusty4g]

My 1616 made 145.9 Bhp

with what mods mate?

[rallyeluke]

My 1616 made 145.9 Bhp

with what mods mate?

Dizzy advance, 99 ron fuel, manifold, 2.25" exhaust, K&N panel filter and silicon power leads and a very healthy engine with 196 psi average on all 4 cylinders