I think it’s pretty good with the flowing and porting that you’re doing. I reckon the factory V6 heads would flow roughly the same so it would be a good comparison to see the difference between your porting and then flowed.
Good video i just cleaned casting dags and bumps on my VN heads in the ports, Got neway cutters, what do you recommend the 45deg seat in/ex width to be on a street engine? Thanks
I try and aim for 0.060in seat touch, checked by machining blue for both in/ex. It's small, but with today's unleaded fuels, the seats are going to widen over time. I also used this as it was a starting point from Mr. Vizards' books about porting. So far, on the heads I have done, there are no troubles.
I disagree. On a flowbench, velocity (which is a restriction causing an increase in vacuum) is not the best for flow numbers. What changed is how the air enters the port, which had the effect of reducing flow through to the cylinder. Since I was only measuring a port without an intake manifold, this situation can be changed. I couldn't prove it due to not having access to a manifold.
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Pretty good demonstration to watch. I’d like to see you do an L67 supercharged V6 head.
I don't have access to the supercharged one, but I do have an n/a one kicking around...
I think it’s pretty good with the flowing and porting that you’re doing. I reckon the factory V6 heads would flow roughly the same so it would be a good comparison to see the difference between your porting and then flowed.
Good video i just cleaned casting dags and bumps on my VN heads in the ports, Got neway cutters, what do you recommend the 45deg seat in/ex width to be on a street engine? Thanks
I try and aim for 0.060in seat touch, checked by machining blue for both in/ex. It's small, but with today's unleaded fuels, the seats are going to widen over time. I also used this as it was a starting point from Mr. Vizards' books about porting. So far, on the heads I have done, there are no troubles.
@@crd-nz_001 thanks for that info
Look at the flow go backwards after the injector boss was squared off. Probably made port to big and affected the port velocity
I disagree.
On a flowbench, velocity (which is a restriction causing an increase in vacuum) is not the best for flow numbers. What changed is how the air enters the port, which had the effect of reducing flow through to the cylinder.
Since I was only measuring a port without an intake manifold, this situation can be changed. I couldn't prove it due to not having access to a manifold.
Alot of the cnc porters leave the injector boss alone. Early heads didn't have injector boss. And apparently flow better om low lift.
Just have a look at the results in your video they are down easy 5% when the boss was removed.