Pump Gas Connundrum

[TheEngineWorks.com]

You should be more then fine with that cranking compression on 92/93, been doing it for a LONG time, with many engines.. Toss some pump swill in it, and have fun! When you say your cranking compression is 183 range, I assume that is peak pressure, after multiple revolutions. Mine is well above that, and I'm not gonna get into what it is, but I fully expect to have nothing in my tank but pump gas..

I didn't see it but I guess you have aluminum heads too..

[CDMBill]

I was wondering what kind of valves to use but the more I thought about it, I was thinking I could also do it with Jiffy-tite connectors so I wouldn't have to worry about leaks. A little pricey to start with the 6 x -8 connectors but would probably be worth it in convenience.

What would cause the fuel heat concern?

Some folks have reported that running the fuel back and forth into a small volume, like a five gallon cell, add heat to the fuel from the pump, the lines, rails etc. without the addtional fuel mass to cool it down, add in a hot trunk based location and who knows?

BTW Rich, with iron heads you have a very different knock threashold than thos of us with aluminum heads. Often a full point of compression lower.

[moparman63]

just err to the safe side enough to make you confident in your rig.that car has come light-years along since last summer.

[c2xejk]

Water/Meth spray is the way to go. I have a Snow Performance system. Last year at Amarilo I ran 17 pounds of boost on 89 octane fuel with no issues. See ya soon, Tom H

Quick question. On a water/alcohol injection system, do you need run braided SS lines (like for fuel lines) to be NHRA legal?

I will likely be running at least water injection and likely a 50/50 water/alcohol blend and wondering if the rubber hose is sufficient or if I need to convert it to braided SS.

Thanks

[BBR]

just err to the safe side enough to make you confident in your rig.that car has come light-years along since last summer.

Tell me about it. I was just flat unprepared last year and had very little confidence in the car. This year I've worked many of the bugs out and feel much much better about the car's prep.

I checked DA's at all the tracks yesterday around 9:30am and all were virtually the same at 2400-ish feet. I'll just monkey around with it on Sunday and see where I'm at and it probably should be a good indicator for the rest of the week.

[moparman63]

cool....that is same DA i had in ennis in may when my car finally dipped into the 10s.

[JeffMcKC]

OK guys this is what I would do, cranking compression is ok to check for going down the road ONLY! Your highest cylinder pressure is at PEAK TQ. (This by the way is when your VE will be the highest.) < this is what counts.

Make a run pull the plug out ( Pull all of them to start) find the lean one this will be the one to keep your closest eye on. If you make a pass then look at the plugs close, you will see some "Black Pepper" if its very light detonation going on its knocking the carbon off the chamber. If you see sparkles, thats piston this is bad very bad catch it quick and save a motor, also look for a chalky ceramic or glazed this meas overheating the plug the glase is like a flash over heat. I HATE seeing guys just tune by AFR's it can get you in trouble quick. I know some that have lost engines that way plugs not AFRs tell you whats going on in the cylinders.

This is what I would do. Not saying you have to but there is no reason to geuss or be lost doing this. I have a 3 gallon cell I shortened up for this year to run stand alone E-85 at the track.

[MR P-BODY]

OK guys this is what I would do, cranking compression is ok to check for going down the road ONLY! Your highest cylinder pressure is at PEAK TQ. (This by the way is when your VE will be the highest.) < this is what counts.

Make a run pull the plug out ( Pull all of them to start) find the lean one this will be the one to keep your closest eye on. If you make a pass then look at the plugs close, you will see some "Black Pepper" if its very light detonation going on its knocking the carbon off the chamber. If you see sparkles, thats piston this is bad very bad catch it quick and save a motor, also look for a chalky ceramic or glazed this meas overheating the plug the glase is like a flash over heat. I HATE seeing guys just tune by AFR's it can get you in trouble quick. I know some that have lost engines that way plugs not AFRs tell you whats going on in the cylinders.

This is what I would do. Not saying you have to but there is no reason to geuss or be lost doing this. I have a 3 gallon cell I shortened up for this year to run stand alone E-85 at the track.

So you run E-85 on the track... are you running E-85 on the road? Or
do you change carbs

[JeffMcKC]

So you run E-85 on the track... are you running E-85 on the road? Or
do you change carbs

EFI, I can run gas or 8-85 with a slight program change, I can also set timing and fuel maps while going down the road.

Plan to run gas on the road and E-85 at the track this is what Doc did with his car last year just pumped his cell dry and refilled. I just have to turn 3 valves

[MR P-BODY]

Gotta ya... I run E-85 on my race car and I thought about running
it on my Rampage for DW(next year) but there are alot of places
in the country you cant get it... plus my engine uses a carb so for
the time being its just pump gas

[bulletproof]

i have a 3 gallon moon tank in the grill.a line coming out of the bottom to a filter to a pump up to the regulator. have a stock style tank under the trunk, line to fuel filter line to pump line heading up to regulator..i have a male jiffy quick disconnect fitting on the regulator and on the front line and rear line a female fitting,,have a 3 way switch on the dash ,up runs the front tank, down controls the rear.
this is a dead head setup..im sure return lines could be used,,maybe have a regulator for each tank,and 1 line to the carb with a disconnect fitting...
last year i ran shut off valves at the tanks and a fuel block,,, but there where to many restrictions...

[slimbo5]

The way I do it is put pump gas in my stock tank t the back of the car.....yeah that's it...lol

[Dignlif]

thanks for all the advice. I think I'll have to wait until next year to add the 2nd cell, my budget for additions this year is pretty much done. I'll continue supplementing with race gas and since I got the AFR meter working, start taking a look at that and attempt to read the plugs.

Although it stinks and wastes fuel and some power, is there any other harm in running a bit rich? For me that's a safer bet until I can discuss this stuff with you guys in person with the car present.

[JeffMcKC]

You really dont want to leave any carbon to heat up and light it off instead of a plug. Black plug bad, a little rich you can live with ( darker wider fuel ring)

[milner351]

Jeff is going to be busy in the pits helping the rest of us read plugs - at least with no shock towers - mine will be easy to get to!