New Prototype Engine: Porting

Before we get into the assembly of the engine, we need to prep the cylinder head with porting. This was not done with the previous prototype so hopefully by porting this time around, we will be able to gain some extra HP over the previous prototype. I have seen information on porting claiming anywhere from gaining an extra 0.5hp to 2 hp. This variability is also related to what cam you use as well. The higher the lift, the more you will gain. With the cam we intend to use, we may not be gaining 2hp, but I'd say somewhere from 0.5hp to 1hp would be reasonable.
Also, because we are using after market valves, we will be doing valve / port mating as well, just to make sure the new valves will seal properly.
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I‘m on Instagram @js_racing_jason

[@dangerrous]

Good to see DIY work instead of just buying or farming out to a machine shop. Couple of hints, when checking for leaks use brake cleaner fluid or Isopropyl alcohol, this will remove any reisdue as you check, they are also a little less forgiving when checking for leaks. Second, when porting, open up the the inlet port transition angle from the neck to the back of the valve seat area, this gives the air fuel mixture a little swirl help passing the valve opening. There's a number of videos describing this procedure, David Vizard has a long video on port design, he also references another video that goes into the benefits of a widened port. The increase in port size is minimal to keep the velocity, it's the shaping that's important, these increases are only really felt at higher rpm's

[@JSRacing-Kartsmith]

Thanks for the insightful advice, I'll try it out once I have the dyno built, should be able to see the difference much better from the dyno results.

[@krbk-j8469]

if you open up ur intake port wouldn’t that help you out too? i’ve heard moving from the stock i think 24mm up to 25-26mm, but i’m not to sure if it’s just a hoax i’ve been trying to find the best ways i can gain more power without just absolutely obliterating my block

[@JSRacing-Kartsmith]

@@krbk-j8469 I would have to do a bit more research on that as I am also planning another build where we open up the intake to about 28 and I have been able to source the right tool and seats for it yet.

[@nevinkuser9892]

Crazy you installed the valve with your fingers. First time I've ever seen that! Do you mind me asking what kind of drill that is?

[@JSRacing-Kartsmith]

It's a Dremel connected to an air compressor.

[@Kothamhomework]

Your porting not much effecting the airflow. Its not much change. Come here i will show you good port job!✌️

[@JSRacing-Kartsmith]

Nice, I'll go check out your channel!

[@Kothamhomework]

@@JSRacing-Kartsmith im sorry but i dont make content about porting job

[@Kothamhomework]

@@JSRacing-Kartsmith but i have some knowledge about it, and i can recommended you some good channel about porting job