Engine mod (BJ 1991)

[Jack-Lee]

And now i build up the new controller. A "UMC1". Sensors: MAF (main), MAT, CLT,TPS,Lambda.

[Jack-Lee]

Now i modified the head of the motor.
I would build in 29mm/32mm valves with 6mm stem in place of the 28/32mm original valves with 8mm stem. In addition i mill the valve seats to the max for much intake/exhaust flow.
I turn my own valve guides, from CW713R, because theres no guides with 6mm inside and 12,06mm outside on the market. Besides i smoothed the ports and makes the radius as great as possible. So i could realise a 25% better cfm rating.
The intake manifold merge to the head and i install the big throttle from the 75PS GT Engine.

And for better comparability i make a dyno-test with the original Engine:
http://network.perfexpert-app.com/results/WsfkuKAXrW

[Jack-Lee]

Another work is done: The Valves are ready.

Intake Valve 35% lighter and more aerodynamic
Exhaust Valve 40% lighter.

[Xist]

Is the only difference between the dyno tests the valves?

[Jack-Lee]

No, the three dynostests made directly in a row. Minimize deviation.
The new Valves, the MPI and the modified head should rise the power from 45hp to 80hp and the torque from 77Nm to 115Nm

[renault_megane_dci]

Nice work.
You focus on exhaust valve to reduce pumping losses ?
Good to know someone who cuts their own valve guides ;-)

[Jack-Lee]

I change all Valves. So i could reduce the weight, could work with ne single spring (instead of two) and improve the airflow.

Yesterday i build the elektronik. Works great (on the Table), today i build it in the car.

[Jack-Lee]

Today the car is ready to roll.

[Jack-Lee]

Oh, i forget to upload the results of the mod with the new fuel injection
Nice Tourqe und Power-gain. Now i musst build up the new head and install it.

[Jack-Lee]

Now the valve-set is complete Ready to install.
I could manage 33% less weight and 20% more flow.