Technical > Spud Miller's Cave

Setting up Hilborn Stack Fuel Injection System

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nitroscott:
Hi, I am trying to get info on Hilborn Stack Injection on a SBC with methanol. The barrel valve I have doesn't have a idle circuit bypass on it, Hilborn said that I did not need one. Will this system idle without the bypass? I would also like to know what to set my main bypass at and what pill. Thank you.

AF150:
I have seen this same type of question so many times. The key to your injector set-up is your pump. Nozzle & jet size is all dependant on the pump output. Send the pump to Spud or Hilborn and have it flowed. Then they will ask about your engine, fuel etc. Only then will they have enough info to tell you how to set it up. Send as much of the system as you can. They can check for damage, worn out parts, leaking O-rings, etc. They can also provide instructions how to plumb the system, leak test the barrel valve and service after you get home from the race. Spud has a great tune-up calculator on his website once you have enough info to answer all the questions. Good luck.

JEFF/21C:
I have the same system had Hilborn go over it they change the lines flowed it, turn around was good ,mine is for a  302 sbc for my 70's style D/altered if I ever get it finished life got in the way

nitroscott:
Thanks for the responses. I would send the system in but Hilborn and FIE won't return messages or emails. What I am wondering is why I don't have a secondary idle circuit. When I talked to Hilborn when buying the parts he said that I don't need a secondary poppet and I always thought I did but that was on nitro. I guess with methanol I wont be burning as much fuel vs nitro.

msundstrom:
I use a secondary only to bring the engine back to idle rpm after a burnout. When you let out of it after the burnout the rpm is hi so the pump speed is hi so fuel output is hi so rpm stays hi and takes a lot longer to come down to idle so you can put it in reverse to idle back to the line to stage. Secondary dumps that extra fuel to prevent that situation. I run a Hilborn and idle is controlled by throttle plate air gap, barrel valve placement and the primary return spring tension for idle fuel pressure.

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