Head Porting

[Mayolives]

I have searched but have not found post about "Do It Yourself" head porting and port matching on the L28. Where can I find information on the subject? Thanks, ...mayolives

[turbobluestreak]

Look again searching for "p90 porting" on the boards like a 5 page theory on porting. Also check other boards that don't apply to this head to gain more ideas on the theory. Then come up with your own port design. I've looked into it and to do it right all the ports would have to be welded to get the required shapes for flow. To me it's not worth it.

 

 

 

tbs

[JMortensen]

I think you can get a decent amount of power out of a simple cleanup job on the head, and unshrouding the valves. On my head there was a LOT of work to be done in the combustion chamber, which I think is something most people overlook. This has all been discussed before, so search the archives, but I think Turbo's assessment that there is no benefit to be had without welding on the head is a little harsh. You won't get huge hp gains, but its a little bit here, a little bit there...

 

I can't wait to see Turbo's DOHC head though.

 

Jon

[turbobluestreak]

Thanks to MACK my second head arrived this week and I'll be cutting it down and face milling the heads down and getting ready to weld them together. At this moment going to say real soon and the heads will be welded together; note I won't have cams made yet or the valves back in. I'm going to give this worthy head a clean up and a mild port job first. I'll have a mock up of part of a head ready soon to get my chains and cams alignment set up. I have a lot of work ahead of me before I can use the head on a running motor but having the head complete is a big start.

 

 

 

 

tbs