Specs are:-
2100 Autolite 1.02 = 245 cfm at 3" Hg, throttles 40 thou over from the first 1957 0.98, with 55 cfm extra,
1963-1966 164 hp Gross 260 cube 2-bbl Fairlane Falcon, Tiger,TVR engine
1960 198 hp Gross 292 cube V8 Ford Fairlane Galaxie Autolite 2100 1.02 was C0AE-H
164 and 198 hp Gross is said to be about 143 to 173 hp net maxium, but likely to be 117 to 141 hp net maximum.
Net Hp is the power of a fully equiped engine at the flywheel, not the power at the wheels. Gross hp is the power of a stripped down engine. The difference can be as little as 14%, and much as 36%. If its more than that, its because of insurance Hp fudging. Some losses of 50% did occur, but that was due to engines loosing 3 points of compression and 30 degrees of cam duration in one year...like the 1973 De Tomaso Pantera.
This is based on other carbs, the 1.08 287 cfm carbs that fed 104 hp 2.8 liter Vee sixes and 119 hp 4.2 v8s.
and the 1.21 351 or 1.23 369 cfm carbs fed 140-178 hp net V8
All pre 1964 got Holley jets.
Normal rule is,
the jets that are in there, they will work.
If not, then there is some goobledegook for ya.
1. Find out the two power valve restriction sizes, as they add 8 jet sizes to the total flow.
Then work out how much net hp you
think your going to get.
1.02" venturi carb is a very low CFM 2-bbl carb, same as, say, a Weber 38DGES, a 123 to 138 hp net carb on European Ford 2.5 to 3.0 liter V6's.
The jet size flow rates have been published for Holleys (XXH), but not for Ford jets (XXF), but based on flow, they work out this way..
47H = 43F are enough for the less than 100 hp net
54H = 50F are enough for about 125 hp
62H = 58F are enough to give 157 to 200 hp net
Holley uses call sizes that aren't the bore sizes.
In a perfectly sustained Muli point carbed or injected gasoline engine,
324 ccs per minute makes 100 Net Horsepower.
648 cc/min, 200 hp,
1620 cc/min, 500 hp net.
Everything else in between by proportion.
That recent 840 hp supercharged Dodge car would need at least 2.721 liters of gasoline a minute, or a 0.719 US gals per minute, plus a factor to ensure it didn't lean out.
Because our engines have single carburettors,
not injection,
and lots of wetted whistle perimeter,
and multiple 90 degree bends
and ports the wrong shape for flow and power,
and one or two points of distribution supplying six cylinders,
some three times as far away as others
a two barrel carb needs a power valve with two 50 to 60 thou holes to enrichen the supply under load. Or 324 cc/min to make 100 horses just isn't going to work.
To get 125 hp, you wont need
just two 202.5 cc/min jets to get 405 cc/minute,
That is two 51 call size Holley Jets for a start. The two power valve holes are normally around 40, 50 or 60 thou, equal to two poorly flowing jets.
Based on those size, and the fact that there is a PVCR for each jet. If they flowed like jets do, that could be 246, 396 or 596 cc/min extra. But the extra amount is only 8 jet sizes for 2-bbl carbs. Its less on other Holley carbs, more on Autolites.
2-BBL's are set up much richer in the Power Valve Channel Restrictions, expect at least an additional two jets sizes 8 steps bigger as well. That is about 138 cc/min, which is about what one Holley 42 size jet produces.
Holley call sizes yeild the following cc/min flow
171 cc/min or 47 thou nominal, 47 call size jet; so 43F Flows approx 171 cc/min
178 cc/min or 48 thou nominal, 48 call size jet
185 cc/min or 48 thou nominal, 49 call size jet
192 cc/min or 49 thou nominal, 50 call size jet
198 cc/min or 50 thou nominal, 51 call size jet; 198 x 2 = 396 cc/min, enough for 122 hp Now the Internals of the Autolite carb then step up 8 jets sizes
205 cc/min or 52 thou nominal, 52 call size jet; [highlight=red]1st jet size up[/highlight]
212 cc/min or 52 thou nominal, 53 call size jet; [highlight=red]2nd jet size up[/highlight]
221 cc/min or 53 thou nominal, 54 call size jet; [highlight=red]3rd jet size up[/highlight]
230 cc/min or 54 thou nominal, 55 call size jet; so 50F Flows approx 230 cc/min; [highlight=red]4th jet size up[/highlight]
239 cc/min or 55 thou nominal, 56 call size jet; [highlight=red]5th jet size up[/highlight]
248 cc/min or 56 thou nominal, 57 call size jet; [highlight=red]6th jet size up[/highlight]
257 cc/min or 57 thou nominal, 58 call size jet; [highlight=red]7th jet size up[/highlight]
267 cc/min or 58 thou nominal, 59 call size jet; [highlight=red]8th jet size up[/highlight]
285 cc/min or 60 thou nominal, 60 call size jet
298 cc/min or 60 thou nominal, 61 call size jet
311 cc/min or 61 thou nominal, 62 call size jet;
325 cc/min or 62 thou nominal, 63 call size jet; so 58F Flows approx 325 cc/min
All you need is the base 50 thou nominal, 51 call size jet to make about 125 hp if the Power Valve is doing its job.
Your total gasoline flow at wide open throttle will be 396 cc/min plus 138 cc/min.
In an ideal engine, every 324 cc/min of gasoline gives a potential 100 hp net.
125 hp needs, by proportion, 405 cc/min
Then the nominal 8 steps above the jet sizes is extra fuel to cover the efficency loss flow time in our I6 induction systems.
The time of concentration,
before gasoline hits the chamber, on a good, well fettled in line six with a good carb, normally, 438 cc/min will give you 100 hp in a six.
The diffence between the 405 cc/min theory amount to make 125hp, and the about 530 cc/min it might need, is measure of how much fuel is losts bouncing around the intake runners.
You can go up to Holley 54's in steps if you need to, which might get you into the 140 hp level, but your exhaust system and cam duration would be the restriction past that.
The maxium jet size cant go more than 1/16th of the venturi size, thats a 63.5 Holley jet size .
The smallest jet size can't be less than 1/25 th of the venturi size, thats a 41 Holley jet size.
Within those two jets sizes, your potential hp range is 77 hp net minimum to 205 hp net maximum.....if you have the right cam technology.
