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Series III or Holden Intake Manifold Project

332 Views 4 Replies 2 Participants Last post by  dezldave961, 
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Did anyone ever find out any significant advantages between these two designs? Horsepower or torque difference worth while mentioning on their engine combinations. Is it worth the extra expense to change to Holden Intake to a W-body FWD car?

INTAKE MANIFOLD RUNNER LENGTH

Does anyone know runner lenght of series III and Holden Intakes? Intake runner entrance area? ( cross sectional widths) Cylinder head / Intake gasket Area? ( cross sectional widths ) This will dictate the angle of taper through the intake runner.

Eg. Series II runner lenght is 8.87" total lenght ( upper and lower intake manifold combined ).

Runner Entrance area- where the intake port meets the plenum area ( this cross sectional width )
This area measured 2.75 square inches. Includes subtracting corner radius.

Cylinder Head / Intake Gasket Area 1.66 square inches. Includes subtracting corner radius.

Bernie
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dezldave961
I ran both the last 2 seasons, with some modifications to each, and I think the L26 with HV3 is better for power, but the Holden with MACE-style spacer under plenum was snappier on the street.

I'll be running the L26 while I push the car the rest of the year, bit plan to swap back to the Holden for street use later, because it's almost as good as a s/c for response (especially with cutout open on a BB turbo).
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dezldave961 said:
I ran both the last 2 seasons, with some modifications to each, and I think the L26 with HV3 is better for power, but the Holden with MACE-style spacer under plenum was snappier on the street.

I'll be running the L26 while I push the car the rest of the year, bit plan to swap back to the Holden for street use later, because it's almost as good as a s/c for response (especially with cutout open on a BB turbo).
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I was trying to indicate the longer runner give you a quicker 60' times at the drag strip and better bottom end response. The Holden Intake would give less turbo lag on your engine combination. 1/8 mile. E.T. would be quicker with this manifold.

On the other hand, the L26 intake with HV3 ( shorter runner insert ) definitely help on top end of the drag strip.
Plus, will add more plenum volume to your intake manifold for that top end charge.

This is why I asked if anyone had information on the measured the length of the intake runners and cross sectional width as I explained earlier...
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dezldave961
You can muse ad infinitum about the science and theory on this (my profession has been in that realm for 20+ yrs), but there's very simple application/practical results that I can easily get with 1hr of wrenching and swapping.

Simple solution for you, would be do what I did and buy both to compare in your personal use case. The various velocities, angles, fluid dynamics, and modifications that can be applied will give you plenty to mess with for only a couple hundred bucks.

ZZP is about to release a new HV insert in the coming months, which they previewed an old prototype of last week in their podcast. I don't doubt it was dyno tested and will be an even better upgrade than my older version.
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