Detail of the 5 angle seat job.
Design and oversee of production heads and manifolds.
jueves, 31 de mayo de 2012
D16Y8 5 seat angle
Did more cylinder head work tonight. Done a 5 seat angle job to my d16y8 customer. Gained a solid 7CFM in all valve lifts, from .1 to .5. The valves need more work in the lathe, need to get rid of some tenths from the valve steam.
viernes, 25 de mayo de 2012
D16Y8
Started the development of a new cylinder head for a new customer. This is a D16Y8 head.
It's a weird head. Honda always seeks for performance but in this one, looked for combustion efficiency instead high flow head. Air tends to flow more throught the right port and then making swirls to maximize
air fuel mix improving combustion.
This is for a D16 low boost turbo setup.
Done a 3 angle seat valve job, resurface the valve with 45º and 30º angles, light work in the valve throat, smoothing the short and long radius.
Achieved today 192CFM at .387 valve lift which is customers camshaft lift choice.
Next must do the remaining 75º and 15º valve seat angle job and see if we can get more CFM without loosing CFM at lower valve lifts.
It's a weird head. Honda always seeks for performance but in this one, looked for combustion efficiency instead high flow head. Air tends to flow more throught the right port and then making swirls to maximize
air fuel mix improving combustion.
This is for a D16 low boost turbo setup.
Done a 3 angle seat valve job, resurface the valve with 45º and 30º angles, light work in the valve throat, smoothing the short and long radius.
Achieved today 192CFM at .387 valve lift which is customers camshaft lift choice.
Next must do the remaining 75º and 15º valve seat angle job and see if we can get more CFM without loosing CFM at lower valve lifts.
miércoles, 16 de mayo de 2012
D16Z6 intake manifold almost done
been working late at night to finish this intake manifold. not a perfect finish but it works, a gain of 6% of airflow.
martes, 15 de mayo de 2012
domingo, 13 de mayo de 2012
D16 intake manifold
reduced the loss of 10% to a loss of 3.38% of airflow. more tapered runner and wider entry from
the plenum to the runner. pics tomorrow.
the plenum to the runner. pics tomorrow.
lunes, 7 de mayo de 2012
D16Z6
more d16z6 head development. achieved 202cfm at only 0.387, it's the oem valve lift.
cfm raises up to 207 at 0.4 valve lift, enough for an aftermarket camshaft.
stock intake manifold shows a loss of 10% of airflow volumen and speed.
did some calculations:
98,960 Cubic Inches @ 6600 RPM with 135,00 % Volumetric Efficiency PerCent
Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 205,8 215,8 225,9
Minimum Intake Valve Lift to prevent Choke = ,299 Lift @ 6600 RPM
Minimum Exhaust Valve Lift to prevent Choke = ,285 Lift @ 6600 RPM
Intake Flow CFM @28in RPM Range = 5106 to 7106
cfm raises up to 207 at 0.4 valve lift, enough for an aftermarket camshaft.
stock intake manifold shows a loss of 10% of airflow volumen and speed.
did some calculations:
98,960 Cubic Inches @ 6600 RPM with 135,00 % Volumetric Efficiency PerCent
Peak HorsePower calculated from Cylinder Head Flow CFM only
600 RPM/Sec Dyno Test Lowest Average Best Potential
Head Flow Peak HP = 205,8 215,8 225,9
Minimum Intake Valve Lift to prevent Choke = ,299 Lift @ 6600 RPM
Minimum Exhaust Valve Lift to prevent Choke = ,285 Lift @ 6600 RPM
Intake Flow CFM @28in RPM Range = 5106 to 7106
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