My head has stock diameter valves and was a comptune flow, but uncle
jack got even more out of it. Wish I had asked him what he did. I
do not have the flow numbers, but all work was verified on a flow
bench. With the 87 mm liners, I have as good a flow as we got with
the oversized valves. What happens is that the valve is so close to
the edge of the liner that it shrouds the outside of the valve and
effectively reduces its diameter. If you are running 89 mm or larger
liners you'll have a better chance of gaining an advantage with the
oversized valves. I agree they are works of art.
The stuff that seems to OBVIOUSLY improve flow does not actually
improve flow. There are certain key areas in the port that really
matter, unfortunately I don't know exactly where they are.
- Tony
At 08:56 AM 10/28/2010, toodamnfunky@comcast.net wrote:
>FoT,
>
>Does anyone have any TR-4 head flow data. I'm thinking of going to
>the big valves
>
>so I decided it's time to get smart on the subject.
>
>
>
> >From TeriAnn's website discussing webers.
>
>"optimum gas speed" for best flow was 325 fps.
>
>
>
>"this might explain a little why lots of times increasing the size
>of the inlet valves does
>
>NOTHING for the power and may even be a deterrent."
>
>
>
>I use the mikuni hsr45 smooth bores which flow at 237 CFM.
>
>I'm just trying to put things into some perspective.
>
>
>
>Jim G.
>_______________________________________________
>fot@autox.team.net
>
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>
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