Landracing Forum
Tech Information => EFI Questions => Topic started by: GD on June 08, 2018, 11:33:31 AM
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I’m building a new motor for this years Speedweek. It is a 286” Flathead with a Procharger supercharger and air to water intercooler. Will be running alcohol and possibly up to 25% Nitro, depending on Dyno results. I know my current fuel tank is too small so we are trying to figure out how much fuel we will need for the short course and hopefully long course if we qualify. Does anyone with a similar setup have information they can share on this subject?
Thanks
Gord Driedger
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GD,
I would suggest that what ever number you come up with you should double that volume in tank size at least. Fuel tanks need to be tall with a big connection on the bottom for the injector pump inlet and you need the extra fuel volume in the tank to insure that the pump does not cavitate and suck air. Really screws up the tune up.
Rex
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I like your idea to run alcohol. I think we might go in that direction also, but take off the turbo and run XF/FALT to get up to speed with the alcohol setup. We cracked another block at the Arkansas 1 mile challenge, this time we cracked the intake seats. Maybe alcohol would be more forgiving? Phil
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I’m building a new motor for this years Speedweek. It is a 286” Flathead with a Procharger supercharger and air to water intercooler. Will be running alcohol and possibly up to 25% Nitro, depending on Dyno results. I know my current fuel tank is too small so we are trying to figure out how much fuel we will need for the short course and hopefully long course if we qualify. Does anyone with a similar setup have information they can share on this subject?
Thanks
Gord Driedger
Gord we have found running gas blown a three gallon tank is fine for the three mile runs theres still plenty of gas left after a run. Im sure even a four mile run will work with the three gallon tank burning gas. We use a carb if your using injectors the fuel flow requirements should be known by the tech people for the brand injectors you use.
Running fuel will of course require more capacity I think a five gallon tank will work fine.
Ronnieroadster
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I appreciate the info RonnieRoadster. Yes I am running Hilborn mechanical injection. Just waiting for them to give us their recommendations on nozzle sizes.
Phil - we found that our naturally aspirated flatly likes alcohol. It ran very well on it and ran quite cool. The biggest challenge is trying to get the motor warmed up enough prior to a run. Hopefully it helps with your issues too. If you are running mechanical injection I’d be happy to share our alcohol tuneup with you if you want.
Rex- thanks for your input as well. Appreciate it.
Gord
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I appreciate the info RonnieRoadster. Yes I am running Hilborn mechanical injection. Just waiting for them to give us their recommendations on nozzle sizes.
Phil - we found that our naturally aspirated flatly likes alcohol. It ran very well on it and ran quite cool. The biggest challenge is trying to get the motor warmed up enough prior to a run. Hopefully it helps with your issues too. If you are running mechanical injection I’d be happy to share our alcohol tuneup with you if you want.
Rex- thanks for your input as well. Appreciate it.
Gord
So far we have not put any heat into the engine prior to A run but we do heat the oil I use a simple 110 volt heater element in the oil pan made by Moroso. I think early in the run the pistons become stabilized well before we have a reasonable amount of traction to really start gaining speed. See you in August
Ronnieroadster