Port Nozzle Hoses

Im setting up a 392 Donovan Hemi, to run 90% Nitro. Port nozzles are #85 to #92. I currently have #3 teflon & steel braid hoses with 90 degree fittings to feed the port nozzles. Fitting and hose ID is about 100 thou at the smallest point where the 90 degree fitting attaches to the hose.
Will this hose and fittings be too restrictive?
What is the best hose to use for high flow port lines?
Engine is using a Enderle 1200 pump. No bypass pill.
Cheers
Dave

 

Hi Linkplas,
I would be interested to know what your fuel pressure is? Those seem like pretty large nozzles. It may work great. How much blower and boost do you have? Do you have a stroker in it? They sure wake up at 90%.
thanks
Dale

 

Hi Dale,
Blower is 8/71 at 20% over. Estimate boost at 20lbs. Hemi is 6.5 compression.
I dont know the fuel pressure yet. Its a new combination and hasnt made a pass. Just done a few cackles while learning about the combo. I have 8 x #64 nozzles in the hat.
Its in a 180" FED with crowerglide, direct drive and 12" tires.
Cheers, Dave

 

I would try to run hose or tubing that has an internal area of at least 1 and a 1/2 times the area of the total nozzles it feeds.

But that is only half of the answer. The other half is - Fuel Pressure! If you don't know what you're running, you need to find out. In your 392 nitro setup, I would have a 0-160 PSI fuel gage (Glycerin filled) with a memory kit and check that puppy every time you run it. Even for a cackle session. If you find you have more pump than gage (I don’t think you will with the pump you have and the volume you’ll need), get a 0-200 gage.

Nitro tune ups like consistent, high fuel pressure from the pump. Every move you make with your tune up is dependent on this.

A repetitive fuel supply pressure curve makes your tuning choices a lot easier and also gives you a known baseline to work from that ensures the changes you make will give you an expected result. Without the fuel supply being reliable and a known value, you’re shooting in the dark regarding one critical parameter when you make a tuning change. Every thing has to be based on the assumption of a consistent fuel supply curve. No gage, now way to ensure that. Don't install one, and it will cost you sooner or later. A lot more than installing the gage kit will.

Fuel flow data helps even more but that is a lot more expensive. A good quality gage will go a long way to keeping your oil and parts inside where they belong.

 

I agree with Fuelish Habit. Fuel pressure is critical. At worst pistons are expendable in short order if the fuel and air ratio are not matched. If your fuel system has not been flowed I would recommend you do so. It is the cheapest money you can spend.
thanks
Dale

 

Thanks for the advise. Where is the best place to install the gauge? in the port distribution block? the hat distribution block? or between pump and BV?
Cheers
Dave