Is multiport injection worth the extra cost??

[Tom Wells]

I had carbs on both cars initially. Now they each have multi port EFI from Holley - the HP model. Considering they were tuned by a rank amateur (me!) they run fine.

I would have kept the carbs except for one thing: the substance we laughingly call gasoline.

When the Cobras were new in the sixties, gasoline was quite different from what we have now. The current boiling point of alcohol-laced gasoline is hardly over 100 degrees F. After a nice run in either car I could watch the Holley carb bowl vents emulate Old Faithful as the lower temp fractions boiled away, flooding the engine.

EFI has a 44 psi fuel pressure that keeps the boiling from happening.

So good luck with the carbs...

Tom

PS: the no-alcohol gasoline may help with a carb - never tried it, as it wasn't available when I had to switch.

[eschaider]

Originally Posted by Tom Wells

... After a nice run in either car I could watch the Holley carb bowl vents emulate Old Faithful as the lower temp fractions boiled away, flooding the engine...

Tom ...

This is also a fire hazard with depressing after effects.


Ed

[Harpoon PV2]

Originally Posted by Tom Wells

I had carbs on both cars initially. Now they each have multi port EFI from Holley - the HP model. Considering they were tuned by a rank amateur (me!) they run fine.

I would have kept the carbs except for one thing: the substance we laughingly call gasoline.

When the Cobras were new in the sixties, gasoline was quite different from what we have now. The current boiling point of alcohol-laced gasoline is hardly over 100 degrees F. After a nice run in either car I could watch the Holley carb bowl vents emulate Old Faithful as the lower temp fractions boiled away, flooding the engine.

EFI has a 44 psi fuel pressure that keeps the boiling from happening.

So good luck with the carbs...

Tom

PS: the no-alcohol gasoline may help with a carb - never tried it, as it wasn't available when I had to switch.

I am more then old enough to remember Ethyl gas, Tetraethyl. Man did that smell good! Little did we know that at the New Jersey Dupont Deep Water plant, the building where Ethyl was made, had the nick name, The House Of Butterfly's, because the men would try to brush off, and chase imaginary bugs, and sometimes, chase them out second story windows. At least 16 workers went violently insane, and died in strait jackets. Then again, I can remember being in the pits at the inaugural Denver Air Race when the fuel truck for the unlimited racers came out with the 180 octane fuel. There was a warning on each side of the tank simply stating, Fatal If Inhaled!

[twobjshelbys]

Originally Posted by Harpoon PV2

I am more then old enough to remember Ethyl gas, Tetraethyl. Man did that smell good! Little did we know that at the New Jersey Dupont Deep Water plant, the building where Ethyl was made, had the nick name, The House Of Butterfly's, because the men would try to brush off, and chase imaginary bugs, and sometimes, chase them out second story windows. At least 16 workers went violently insane, and died in strait jackets. Then again, I can remember being in the pits at the inaugural Denver Air Race when the fuel truck for the unlimited racers came out with the 180 octane fuel. There was a warning on each side of the tank simply stating, Fatal If Inhaled!

I grew up on a farm in South Dakota. After a day with grease and dirt up to our elbows and beyond we'd go to the gas tank and wash the grease off with the leaded gas. It evaporated in seconds.

[Harpoon PV2]

Originally Posted by twobjshelbys

I grew up on a farm in South Dakota. After a day with grease and dirt up to our elbows and beyond we'd go to the gas tank and wash the grease off with the leaded gas. It evaporated in seconds.

We used to wash the underside of the radial engine WWII airplanes with high test aviation fuel. Even on a relatively warm day your hand would be freezing!