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#21
11-14-2016, 01:48 PM
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Tom, I really would like to run a front tank, but I'm nervous about having any tank/supply up in the front of a street/strip car. I've been thinking of building/installing a tank up front for the strip only, leaving it all empty for normal use, using valves at the injectors to switch from gas coming from the rear tank, then switch to a front tank for the strip. I believe the 91 swill we have here should allow a safe 14 psi with correct tuning and that would be about 1000hp on the street. The front tank would then supply E85, or alcohol for the strip. We just changed away from E85 down here to E55/E54 because of some law about flex fuel crap. My 2000cc injectors should be fine for alcohol at 1200 HP and up. I do have a nice 3 gallon pretty/shiny surge tank I could mount on the firewall. I could use a smaller rear pump to supply fuel from the rear tank, into the surge tank, then use my big pump out of the surge to supply the engine. Then drain the surge thru the engine system to run alcohol with the rear tank, pump, and lines closed off. The return from the regulator bypass can run back to the surge tank in each system. When I'm using the system for the 91 premium I can open the surge return to go back to the rear tank. Just lots of plumbing.
Mark
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My Gasser '63 Catalina build. Oh sorry, it's a Street freak. Either way it's a fun build. |
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#22
11-14-2016, 08:26 PM
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PM to you Mark.
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#23
11-14-2016, 09:07 PM
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NO tank on firewall !!!
Build a dual fuel sytem! For pump gas street use, a RobbMc Power surge may be your best bet for street use. (1000 hp rated)(1100 carbureted) http://www.robbmcperformance.com/pro...owersurge.html http://www.robbmcperformance.com/ins...PowerSurge.doc In street mode you should only need something like a Holley or Mallory pump if no place for a stock pump on your setup. Build something similar for when you switch to ethanol. (with an appropriate supply pump) Use two main tanks in trunk. One for each fuel. You'll need changeover valves on both supplies and main tank returns. Your MS3 will support a flex fuel sensor. I was reading the "?" marks in the settings in Tuner studio and think that should work well. As you switch tanks over it will sense the fuel difference and compensate accordingly. Anything left in rails will only slightly affect actual percentages of ethanol in either tank and flex fuel sensor compensates for it. Get yourself a drum of E98 for racing and run pump gas for cruising. |
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#24
11-14-2016, 11:24 PM
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All great info guys, thanks.
__________________
My Gasser '63 Catalina build. Oh sorry, it's a Street freak. Either way it's a fun build. |
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#25
11-18-2016, 06:51 PM
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NO tank on firewall !!!
Lol Bruce. Remember, my firewall is 15 inches ahead of the clutch area. Right at the center/middle of the motor. No normal firewall safety problems with clutch explosions. Mark
__________________
My Gasser '63 Catalina build. Oh sorry, it's a Street freak. Either way it's a fun build. |
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#26
11-21-2016, 12:41 AM
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Quote:
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#27
11-21-2016, 11:20 AM
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Good Post Aaron and a concept often missed in discussions about fuel systems.
Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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#28
11-21-2016, 05:01 PM
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Very true Aron and great catch/reminder. I do know this however I failed to think about it as I was considering my alternatives. My biggest concern for a front mount surge is the fuel leaking if punctured in an accident. Then contacting hot surfaces. If I use a front mount surge tank of some sort (I have one purpose built 3 gallon surge tank and one 3.5 gallon Moon tank for consideration), I would use them as first return destination after the regulator and then overfill back to the rear tank. That way it would be full almost all the time except under full fuel flow (WOT) where it might drop in level if the rear pump does not completely keep up with demand. But that would be a very short lived time. It would be full all other times.
Mark
__________________
My Gasser '63 Catalina build. Oh sorry, it's a Street freak. Either way it's a fun build. |
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#29
11-21-2016, 07:09 PM
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That is exactly the way that the Autocross systems are set up and function with their Surge Tanks. Tank always full unless the fuel demand lowers the fuel slightly if the pusher pump cannot keep up.
The surge tanks I use are made out of .120 wall heat treated aluminum and would survive many potential crashes scenarios without a potential puncture. A ripped off fuel line or a lousy mounting system (like Daddy Dave's NOS bottle flying out of the car in his crash) would concern me more than the potential fuel leak after doing a quality surge tank installation. Tom V.
__________________
"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
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