Is there a formula to calc. for alt. & outdoor temp.?

skiwesser · 06-12-2004, 01:51 AM

I did'nt run good today!!

I'm hoping it was cause of heat & humidity (8pm-10pm) it was

real humid and prob. 89-91 degrees out.

Think this caused my low ET's. Car felt real strong and hooked

GOOD but still only cut 2.01-2.04 60 ft. times?

Please tell me I'm right, last time i went was b-4 T.B,1.7's intake

& head porting (I did them w/ a dremmel

) I also had

heads milled .035 and was hoping for better times

Is there a formula or website to calc. for alt. & outdoor temp.?
Thanks Wes

Mercury · 06-13-2004, 04:10 PM

Your 1.7 was before Porting???

Porting cylinder heads is alot more involving than people think. And more bad can be done than good.

Just getting in there and grinding metal out can affect alot of aspects of the flow rate. Even to stock Ford heads (Which are kinda weak on the exhaust especially), you can still hurt the flow by just hogging them out.

Bigger doesnt always mean better.

Not trying to be a jerk, just letting one know.

There are several good books you can find at Barnes and Noble, and Books A Million about head porting. They go into the science of it. And its that, a science.

As for the formula you asked about, I have no clue.

lx mike · 06-14-2004, 06:59 AM

thias will help you. it calculates the density alittude based on temp, humidity and barometer reading. higher means there's less air for your engine to use.

http://wahiduddin.net/calc/calc_da_rh.htm

06-12-2004, 01:51 AM	#1
skiwesser Registered Member Join Date: Sep 2000 Location: rock hill,S.C. 29730 Posts: 420	Is there a formula to calc. for alt. & outdoor temp.? I did'nt run good today!! I'm hoping it was cause of heat & humidity (8pm-10pm) it was real humid and prob. 89-91 degrees out. Think this caused my low ET's. Car felt real strong and hooked GOOD but still only cut 2.01-2.04 60 ft. times? Please tell me I'm right, last time i went was b-4 T.B,1.7's intake & head porting (I did them w/ a dremmel ) I also had heads milled .035 and was hoping for better times Is there a formula or website to calc. for alt. & outdoor temp.? Thanks Wes __________________ 88 GT: subs,pullies, 1 3/4 longtubes, flowmasters, AFR 165's,T,F #1 cam,Thyphoon intake, 24# inj., 73mm C&L,65mmT.B., 190LPH pump, Eagle sir rods, forged pistons in a newly rebuilt 306. DYNO TUNED TO 300.97 RWHP 337RWTQ

06-13-2004, 04:10 PM	#2
Mercury The Redneck James Bond Join Date: Sep 2000 Location: Fayetteville NC Posts: 1,707	Your 1.7 was before Porting??? Porting cylinder heads is alot more involving than people think. And more bad can be done than good. Just getting in there and grinding metal out can affect alot of aspects of the flow rate. Even to stock Ford heads (Which are kinda weak on the exhaust especially), you can still hurt the flow by just hogging them out. Bigger doesnt always mean better. Not trying to be a jerk, just letting one know. There are several good books you can find at Barnes and Noble, and Books A Million about head porting. They go into the science of it. And its that, a science. As for the formula you asked about, I have no clue. __________________ 64 1/2 "D" code Red Mustang Coupe. Red Baron, 2000 Perf Red Mustang GT. 5spd. Stage 2 CNC heads with Large Valves, Comp Cams (270-274 dur .550 lift), Forged Crank, DRP pistons, Manly H-beams, Pro M 87 mm Mass Air, 24lb Inj, 75mm TB, Plenum Spacer ,Long Tube Headers, Homemade H-pipe, 2 chamber Flows, 4:10's, Steeda Tri-Ax, LKW 70/30's, Eibach Drag Springs, Steeda SubFrames, Battle Boxes, Rear Girdle, Adj uppers, Alunimum Drshft, Southside Lift Bars. Project Cars, 64 1/2 6cyl coupe, 1930 Model A Nostalgia Rod.

06-14-2004, 06:59 AM	#3
lx mike Undescribable Join Date: Sep 1998 Location: Ft Myers Fla Posts: 1,539	thias will help you. it calculates the density alittude based on temp, humidity and barometer reading. higher means there's less air for your engine to use. http://wahiduddin.net/calc/calc_da_rh.htm __________________ Rice Haters Club Member #101

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