Idle EGT temps

On a blown injected BBC with 14/71 HH what do you like seeing for EGT at idle? also what kind of fuel pressure at idle? I Know that can be nozzle dependant but just looking for something to reference

 

Thank for the quick response Mike. Reason I asked is I did a first time start up last night on a brand new build, TBS XR1 blower JBR hat. Brand new Enderlie 110 twin gear pump BV at 75% blades at.012. Idle check at 10PSI and port at 25. Pressure was 16 psi It surged like a mofo and EGTs were 950-1050 at idle. Hat nozzles front to back are 56, 54, 52 and 48 x 4 in the blower. I think I have a vacuum leak under the hat. what was weird is I richened the BV and ithe surge got worse

 

Will, idle was in the 2-2200 range in park, when I put it in gear it would surge so bad it would almost kill the motor. the 25psi port check seems to be the consensus from those I have talked to for a BBC in TD to on the hat only on the 2 step. High EGTs I bet is from fuel burning in the pipe. Definitely fat

 

Reading at the pump, also have on at the port line of the BV but its not reading for some reason, showing 0

 

Port check in backward?

 

No it is correct and cracks right at 25

 

send to advanced power systems randy Anderson end all the guess ing.

 

Mike I do not have a pump sizer loop, with a 13gpm pump Jim at Enderlie didnt feel it is needed. . Made a few changes today, took some nozzle area away in the hat, reset the BV from 75 to 72. BV is 2 flats from lean. made a pill change from 125 to 135 and it idles really good at 2200 EGT temps dropped to 850-950 but still surges bad in gear, 1300-2300. Pump pressure now at 20 at idle

 

I can't imagine getting my BBC to idle at the egts Mike mentioned above. Mine likes about 800 average. I have it setup so it surges pretty good at first but about the time I back up from the burnout, it's pretty well cleared up. I clean it up with the shutoff during warmups or if I have to sit more than a couple seconds in the bleach box.

It used to surge all the way into the beams before I raised and cleaned my idle check. I actually got pretty good at staging with the surge, kinda preferred it that way. Not sure I really fixed anything by smoothing it out.

2200 would drive me nuts not to mention drain my tank. I can get it clean at 1600-1700 if I mess with it a lot, but never found a reason to idle a bracket car higher than 18-1900. Pretty sure my blades are less than .010 and my bv is wherever it sounds right.

 

Looked good Mike, nozzle plate is o ringed both sides and making good contact, blower restraint plate siliconed and tight

 

Mine idles in the lower 900's with a couple of stragglers in the upper 800's at 1625 rpm with absolutely no surge. Personally I detest the surge.
Who's leak down meter are you using, and where is the regulator set on the compress?
I use the big moroso meter, and have a snap on also. Not a fan of the dual gauge 69 dollar ones that seem to be so popular.
With regulated pressure of 100lbs either of mine will read (x), but, as a test i checked, and at non regulated pressure (125) the reading is different on both of my gauges.

 

The air/fuel ratio is not correct at idle - we ran a BBC for long time without any problems, low idle EGT;s and smooth idle in gear @15-1600.
The butterflies are closed too tight - not enough Air for amount of fuel coming into the engine.
Open the butterflies - richen the BV - untill you get idle EGT
Also 135 pill will make the engine run very very lean at high RPM. i would not run it.

 

Steve,
You never mentioned if you are using a high-speed. A high-speed will act like a pump loop if the crack pressure is low enough.
Joe

 

No high speed, this is a brand new combo with all brand new parts. Just trying to keep it simple to start with