Who is best for cylinderhead development work uk
Discussion
227bhp said:
A flow loss = power loss, but not necessarily vice versa
That is both a logical and mathematical impossibility. If a flow loss always equals a power loss then a flow gain must always equal a power gain for the former to be true.In actuality head flow and power potential are very closely correlated UNLESS some other limiting factor, often the induction system flow capability, is capping the gains. For this reason low and mid valve lift flow gains more easily translate into extra power than high lift flow gains which are more likely to be capped by other restrictions. As most people only ever look at the peak flow number they can frequently misled about the power potential. The whole flow curve is important and my own algorithms developed over 25 years take all of it into account. This is not a topic to be discussed lightly or with simplistic intergoogle words of wisdom or misunderstood anecdotes.
I couldn't find em either Mike
We recorded a drop in inlet air flow when port split in MGB head radiused but increase in bhp as the flow could swap from port to port more easily.In fact the split being formed at the port face by making the port much larger then power testing as the split was ground further back then radiused showed linear improvements with increase of rpms as the start of the split went nearer the valves. Ultimately power plummeted when the split was ground too far back, ironically we showed a gain on the flow bench at this point!!!! Jury still out on whether horizontal channels on the port split also increases bhp.
Peter
We recorded a drop in inlet air flow when port split in MGB head radiused but increase in bhp as the flow could swap from port to port more easily.In fact the split being formed at the port face by making the port much larger then power testing as the split was ground further back then radiused showed linear improvements with increase of rpms as the start of the split went nearer the valves. Ultimately power plummeted when the split was ground too far back, ironically we showed a gain on the flow bench at this point!!!! Jury still out on whether horizontal channels on the port split also increases bhp.
Peter
PeterBurgess said:
I couldn't find em either Mike
Peter
I'm pissed off that my factory cnc race GM heads seem to be so lacking, lol. I think i'll stick with the GM item and boost. They'll be easily replaceable if ever I need one.Peter
Oh, it revs like a motorbike. Lets get the TR back on the road :-)
its pretty simple sometimes a flow loss means less power, sometimes the same power or sometimes more power....it really depends what the head is bolted to during operation and other characteristics of the cylinder head.
the engine doesnt actually care what the flow bench reads for CFM
the engine doesnt actually care what the flow bench reads for CFM
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