Idle EGT`s

How can idle EGT`s kept closer together. I´am using the enderle BAU injector with 6 nozzles along with 2 nozzles in the back of a 14-71 HH retro plus the ports.
Engine is a 375 big chevy.
As the ports are non active at idle i ask myself how this is done. As i raise the
idle speed, temperatures come lot closer. Car is a powerglide appl. so idle
speed cant`be raised more than 1850 in my case.
Will playing with the injector nozzle size be the cure?

any help would be appreciated

BJ

 

what is your pump pressure at idle ???
what pressure do your port nozzles open at ??

you might want to fatten up the barrel valve a flat or so.

at a idle,..low pressure the amount of fuel going into the motor
goes in where there is the least resistance,..as you come up in rpm the pressure increases equalling out threw all of the nozzle areas

Increasing the hat nozzle sizes wont change individule cylinder
temps, but will help overall temps across the board.
also if increasing hat nozzle sizes your nozzle area will change and you will need to compensate for that elsewhere in the fuel system.

how much overdrive is on the blower ???

 

at 1800 to 1850 idle rpm, pump pressure varies between 12 and 21 psi,
ports open at 16 to 17 psi
blower od. is 25%

temperatures of cyl. 1 + 2 are around 380° all other are appr. 150 higher.

any thoughts?

 

what are the egt`s like during the run ??
does your motor surge at idle, or is idle constant smooth ??

 

uneven at idle

My tuneup guy says don't pay attention to the temps at idle, especially if you aren;t using dribblers. Just pay attention to them at WOT.

 

What's the best way to monitor cyl head temps?

 

There are probe sensores you can put into the cylinder heads that your
computer can read from,one in each head tapped and screwed into...
..or,
..a company named mcmasters ???? or something like that, make these
heat strips you can place on the heads and see actual head temps.

 

that would be mcmaster carr

 

Mike, check with Randy McMahon at RPM Performance. He's building 3/8-16 thread screw in sensors for his system. I think with the proper calibration data they should work with most any recorder.

http://www.rpmperf.com is the website.

Wayne

 

$70 motorsports innovations
http://www.motorsportsinnovations.com/wb_temp.htm

 

You sure about that Mike? Looks like it would work on any bolt hole. More importantly, did you call and ask?

 

The kind that you drill and tap the hole in the
back of the head, then screw the probe into, but then
it just reads the back cylinder head temp.

 

on my veney heads there is a place that is drilled and tapped on the exhaust side between the 2 cylinder heads, way up in there. The sensor from motorsports innovations is designed to be bolted to the head. Don't forget that the temp is all relative. What you want is to get consistency in the head temps and compare one run to the other, not necessarily your data with someone elses, so if you read off the back of the head and always read there, you'll know where you stand, but you can't compare someone elses #'s. Just like you should always use the same tire pressure guage every time. If you borrow someone elses it could be off and even though you thnk you have the "right" pressure, it may not ranslate.

 

Danny;

Might be a silly question, but what good is head temp if you're reading EGT?

Is there a correlation between the two?

 

Ok, so lets say that you have 700 egts, and it is a false reading.

If the head temp is the same from one run to the next, how would you know the egt is false?

Would you be just as well off on a water block to take the water temp, or still take head temp?