Dart Pro-1 215cc and RHS 235cc Flow Tests

[MaxRaceSoftware]

RHS # 12030 235 CC Head FlowBench test results to follow


(these are the Old-Style, not the new Platniums)
Dart Pro-1 215 cc Heads Out-of-Box Shape on a 4.125 Flow Fixture
2.080/1.600 Valves

Intake Port CenterLine Length = 5.4925 " inches long
actual measured Port Volume = 218.5 CC's
Theoretical Average CSA= 2.42763 sq.inches area

Exhaust Port CenterLine Length= 3.0275" inches long
actual measured Port Volume= 74.5 CC's
Theoretical Average CSA= 1.5017 sq.inches area

[automotivebreath]

Larry,
In the bottom chart you have three columns, minimum, normal and maximum
HP for 8 cylinders. Can you explain how these figures are determined?

[MaxRaceSoftware]

Originally Posted by automotivebreath

Larry,
In the bottom chart you have three columns, minimum, normal and maximum
HP for 8 cylinders. Can you explain how these figures are determined?

i just needed something to "Fill-in" that bottom right corner of the page

i decided to display a few "BallPark HP estimations" in that corner,

here's the breakdown->

the "Minimum Column" is
Min HP = FlowBench_Flow_CFM@28" x .257 x Number_of_Cylinders
more for a "Beginner" Engine Builder with maybe Low CompRatio engine,
stock oil pan, normal weight rotating assembly,
limited Carburetion, mild Hyd or solid Cams, Low Lift Rollers,
and maybe some CSA Choke problems, maybe Un-Tuned Lengths ,etc.

Normal HP =
would tend to correlate for more Professional Engine Builds
with CompRatios in the 9.5 to 12.5:1 CR Ranges,
light oil, large oil pans, excellent Hone/Ring Seal, lightweight Rotating Assembly,
max-area type Cam Lobes, Solid Rollers, Large Carbs, Single-Plane
and Tunnel-Ram Manifolds, Tuned Intake + Exhaust System Lengths etc.

Max HP=
tend to correlate to State-of-Art Professional Engine Combination,
12:1 to 16:1+ CR Ranges, Unlimited Carb(s), Camshaft,
DrySump or Large Oil Pans w/Vac Pumps,etc.

basically Max-HP Column is the most you would expect ?
a few Engines surpass this Column , but not by a whole bunch !

and also the proper way to view all those Columns
is for example,
if your Cam Valve Lift is .600" Lift
then subtract .100" lift off that and use .500" Lift Flow Numbers
to tell what HP you might be capable of making

like is stated...its just "BallPark" stuff ...freebie Info

[MaxRaceSoftware]

the Dart Pro1 215 CC Heads are not impressive at all
Out-the-Box... and i've seen them make 487 Peak HP to 540 Peak HP Range
on 388cid SBC to 406cid SBC with small solid Roller Cams (.630" Lift range)
in Out-the-Box shape absolutely no Porting.

but after going to a 2.100 or especially a 2.125 to get more metal to "Shape"
on the Valve Job + Bowl + Short Turn Area + Chamber transition,
they end up making a ton of HP gains !

the actual Porting in the Entry and the Pushrod area and the Port itself
is really no different than if i was maxing it out for a 2.080" Valve,
its just going to a 2.125 gives you more metal to shape in the Bowl + VJ areas

The Intake Ports are Ported to match the FelPro# 1206 gasket area/specs

Danny's 756 HP 434cid is matched to FelPro# 1206 Gasket

[MaxRaceSoftware]

[MaxRaceSoftware]

these next Heads are the "older" ProAction cast-iron Heads

i handpicked this Pair out of 12 Pairs in my Shop,
they are about as perfect as can be, no core-shifts, very uniform thickness,
no blemishes, etc.

they are perfectly band new, out-of-box shape, just "Older" in Time .

[rookie]

Why such a difference from the same casting company?

[MaxRaceSoftware]

Originally Posted by rookie

Why such a difference from the same casting company?

i don't know ?

the old 14deg cast-iron ProActions like what we run on
Craig's A/ND had a bunch of core-shift,
ended up just HardBlocking the Cylinder Head waterjackets.

Craig runs no water in the Block or Heads,
the HardBlock was just for Wall support in the Cylinder Heads.

[L89 chevelle]

Originally Posted by MaxRaceSoftware

i don't know ?

the old 14deg cast-iron ProActions like what we run on
Craig's A/ND had a bunch of core-shift,
ended up just HardBlocking the Cylinder Head waterjackets.

Craig runs no water in the Block or Heads,
the HardBlock was just for Wall support in the Cylinder Heads.

Larry can you tell us more about the 14* cast heads? flow, port size, etc..

I have a new set and was thinking of doing them up.

[MaxRaceSoftware]

Originally Posted by L89 chevelle

Larry can you tell us more about the 14* cast heads? flow, port size, etc..

I have a new set and was thinking of doing them up.

which CC'version of the 14deg do you have ?
what Valve sizes

what's the Engine Specs and expected ET/MPH times ?


Methanol or Race Gas
Carbs or Injectors ?