500 cfm 2 bb

[Dragon]

YOu need to put the e85 gaskets and other parts in it. The alky content softens the parts and gaskets otherwise. My 750 80508S came with e85 gaskets but gas jets.

[willowbilly3]

Probably so but it seems more than that, if I put in 10% ( and even certain brands of regular that are not alky) it will loose idle consistency and I have to heel and toe it at lights to keep it running. Usually a good dose of super will bring her back to normal.

[willowbilly3]

From a post in another forum

FAQ Material, originally posted by FTF:

I found the flow rates for MC2100/2150 2 barrels.

This information comes from CJOFFROAD.COM. That website has a ton of information on these carbs.

2V 2100/2150 at 3"Hg. Venturi size listed first.

0.98 = 190 CFM 24.9mm/24.9mm syncronous venturies.
1.01 = 240 CFM 25.6mm/25.6mm " "
1.02 = 245 CFM 25.9mm/25.9mm " "
1.08 = 287 CFM 27.4mm/27.4mm " "
1.14 = 300 CFM 29.0mm/29.0mm " "
1.21 = 351 CFM 30.7mm/30.7mm " "
1.23 = 356 CFM 31.2mm/31.2mm " "
1.33 = 424 CFM 33.8mm/33.8mm " "

When comparing to 'metric' carburetors, remember that venturi size is not the same as bore size. In example, a Weber 32/26 has venturies of 26mm/27mm




Remember that four barrels are flowed at 1.5 "hg. So these flow numbers do not equate to 4V flow. To convert divide by 1.41.

So, for example, a 190 2V would be equivalent to a 135 4V.
A tri-power using 3 of these 190s equals a 404 cfm four barrel.

[Dragon]

Probably so but it seems more than that, if I put in 10% ( and even certain brands of regular that are not alky) it will loose idle consistency and I have to heel and toe it at lights to keep it running. Usually a good dose of super will bring her back to normal.

That tells me there is more than carburation alky problems then. My truck has to run premium to not ping. Now that fuel has alky in it for winter. I can run midgrade. The problem is not only does my truck ping on regular I have to readjust the idle screws I need to rejet the carb richer to get it to run better. The richening of the carb quenches some of the pinging and makes the engine smoother on regular. The car engine I have in my truck is a 65 high compression 4V motor so I am looking at around 10 to 1 static.

The metering plate and block are different too. I forgot to mention that.

[willowbilly3]

Mine is a 70 car 390 2 bbl, probably 9 to 1. I have found if I run regular gas from a certain gas station that I have no problems so I don't mess with it. It's been a while since I checked the timing.

[Dragon]

From Wikipedia So it seem if my 65 is stock I have 11 to 1 that would explain the wild hard pinging I get on Summer regular. And you are at 9.5 to 1
http://en.wikipedia.org/wiki/Ford_FE_engine#390
2V
8.9:1 — 250 horsepower (190 kW) at 4400 rpm and 378 lb·ft (512 N·m) at 2400 rpm
1963-1965 Mercury
9.4:1 — 266 horsepower (198 kW) at 4600 rpm and 378 lb·ft (512 N·m) at 2400 rpm
1964-1965 Mercury
9.5:1 — 275 horsepower (205 kW) at 4400 rpm and 401 lb·ft (544 N·m) at 2600 rpm
1966 Ford
1966 Ford Fairlane
1966 Mercury
1966 Mercury Comet
9.5:1 — 270 horsepower (200 kW) at 4400 rpm and 401 lb·ft (544 N·m) at 2600 rpm
1967 Ford
1967-1968 Ford Fairlane
1967 Mercury
1967 Mercury Comet
1968 Ford Mustang
1968 Mercury Cyclone GT
1968 Mercury Cougar GT
10.5:1 — 280 horsepower (210 kW) at 4600 rpm and 427 lb·ft (579 N·m) at 2800 rpm
1968 Ford
1969 Mercury
9.5:1 — 265 horsepower (198 kW) at 4400 rpm and 401 lb·ft (544 N·m) at 2600 rpm
1968 Ford Fairlane
1968 Ford Torino
1968-1970 Ford
1968-1970 Mercury
8.6:1 — 255 horsepower (190 kW) at 4400 rpm and 376 lb·ft (510 N·m) at 2600 rpm
1968-1971 Trucks
9:1 — 255 horsepower (190 kW) at 4400 rpm and 376 lb·ft (510 N·m) at 2600 rpm
1971 Ford, Mercury
8.6:1 — 201 horsepower (150 kW) net at 4000 rpm and376 lb·ft (510 N·m) at 2600 rpm
1972-1975 Trucks
4V
10.6:1 — 375 horsepower (280 kW) at 6000 rpm and 427 lb·ft (579 N·m) at 3400 rpm
1961-1962 Ford
9.6:1 — 300 horsepower (220 kW) at 4600 rpm and 427 lb·ft (579 N·m) at 2800 rpm
1961-1963 Ford
1961-1963 Ford Thunderbird
1963 Mercury
9.6:1 — 330 horsepower (250 kW) at 5000 rpm and 427 lb·ft (579 N·m) at 3200 rpm
1961-1963 Ford Police Interceptor
1963 Mercury Police Interceptor
10.1:1 — 330 hp (246 kW) at 5000 rpm and 427 lb·ft (579 N·m) at 3200 rpm
1964 Ford Police Interceptor
1964 Mercury Police Interceptor
11:1 — 300 hp (224 kW) at 4600 rpm and 427 lb·ft (579 N·m) at 2800 rpm
1964-1965 Ford
1964-1965 Mercury
1964-1965 Ford Thunderbird
10.5:1 — 315 hp (235 kW) at 4600 rpm and 427 lb·ft (579 N·m) at 2800 rpm
1966-1967 Ford
1966-1968 Ford Thunderbird
1968 Mercury
10.5:1 — 335 hp (251 kW) at 4600 rpm and 427 lb·ft (579 N·m) at 3200 rpm
1967, 1969 Ford Mustang
1967, 1969 Ford Fairlane
1967, 1969 Mercury Cyclone GT
1967, 1969 Mercury Cougar GT
1969 Ford Torino
1969 Mercury Montego
10.5:1 — 325 hp (242 kW) at 4800 rpm and 427 lb·ft (579 N·m) at 2800 rpm
3x2V,
10.6:1 - 401 hp (299 kW) at 6000 rpm and 430 lb·ft (583 N·m) at 3500 rpm
1961-1962 Ford
10.6:1 - 340 hp (254 kW) at 6000 rpm and 430 lb·ft (583 N·m) at 3500 rpm
1962 Ford
1962-1963 Ford Thunderbird

[willowbilly3]

Good post, thanks. Mine runs a bit weak for a 390, probably because of the timing. I had it set once with a noticable ping a wot and it ran really strong there. Maybe when the weather warms up and the roads dry off I will put a tank of super in and jack the timing up, see how she really runs.