xecute":7s60acaq said:
From every drive report I've gotten my hands on, all six cylinder Ford I6's surge when punted hard through corners. Except for the EFI ones and those with Weber carbs.
We do have some pretty hardcore curves
Who can get 7 to 8 degree leans like our old Fords do, and do you guys get fuel surge. Especially interested in Holley 2300 and 5200 equiped rides.
A 32/36, 5200 or DG series carb isn't like an IDF, IDA, or DCOE Weber. The traditional Ferrari or Porche race carb is one of the best when mounted correctly.
The DG series is pretty good when the float bowl faces the front of the car, too. Plenty of mad Europeans with Fiats, Escorts, Capris and Cortinas raced with the DG series carbs without fuel starvation.
Setting the float level higher isn't normally a good idea, but its cheaper to bend the float hanger than spend money on something, so experiment a little!
It's not hard to get over twice the g foces in a corner, than you'd get by straightline acceleration alone in our sixes. If your car has a highly modified engine with a big ccam, nitrous, a blower, a 2v head, or a killer turbo you might trip the 1 g mark, but generally the cornering forces are the most likely to cause surge!
A stock Mustang can lean up to 6 ot 8 degrees in an evasive turn, but is still likley to lean a fair amount when negotiating on ramps or off ramps. Even a 12% grade isn't going to cause the problems of a hard left turn.
The traditional mounting for a 32/36 or 5200 or 350/500 Holley on log head sixes is sideways. Its simple and neat that way. The downside is that the fuel is starved from the float bowl under what is termed 'hard cornering'. These days, hard corning in a Mustang is moderate cornering for modern cars.
The Capri 2600 and 2800 engines ran a similar carb set up, and didn't suffer starvation during conrnering,. The difference is the carb was in the centre of the car, not off the side, so the roll centre was where the carb is. On our sixes, even a moderate turn can make the carb freefall a few inches downward during a left-hand turn, while the fuel is leaning at a 45 degree angle, way from the jets.
Fuel starvation is common to all Fords with stock 1-bbls carbs on the I6. If you use new shock absobers, it will have less starbvation . With stiff springs and good tires, it only gets worse.
Over here, all our Aussie Fords and Holdens I6's suffered from fuel surge until about 1982, when Rochester and Weber carbs were used, mounted with the float bowl to the front of the car.
When our tourng car racers used side mounted Holley 2-bbls carb in the sixties on Falcons and Holdens, they were pretty useless as the fuel surge only got worse. Spending a few hundred bucks on a fuel regulator and a surge free electric centifugal fuel pump helps, but it's not a certain to work.
(Later Holley electric or mechanical pumps don't povide a seamless fuel delivery, nor do Carter mechanical pumps, but some of the cheap Carter, Nipondenso or Isuzu electric pumps can improve things if they are wired up safely).
The only sure fire way to remove starvation is to mount the carb with the float bowl to the front. The Holley 350 and 500 carbs can have jet extenders and float conversions which help a lot, but there is nothing for the 2-bbl Holley Weber 5200 or 32/36.
Some improvement might come from experimenting with 200 bucks of hard earned cash for
1. a 12-804 Holley pressure regulator close to the carb,
2. a Carter 4070 electric pump.
That will stop any fuel surge from the pump and fuel line, and ensure the float bowl is instantly replenshed if the seat valve opens suddenly.
