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Re: H89 vs gx head

Subject: Re: H89 vs gx head
by a12dato120y on 2019/5/15 22:04:48

Very interesting i wonder what the reasoning is, the h89 inlet ports look quite well designed in comparison to round ports.

I honestly cannot figure out the theory behind large port whilst retaining smaller valves.

In my mind the h89 will have better flow charecteristics with the larger valves at all valve lifts until port size becomes a restriction at high rpm.

Even then i cant see the gx head outflowing it at higher rpm with the smaller valves if they both where utalize same lift cam.