Dan_s_young

iTrader: (1)

Well the current jets I have are:
Idle jet: f9-60, f9-55
Air correction: 155
Main fuel: 145, 170, 190
E tubes: f-7, f-16
Im using a ramflo filter so I have no air horns... And im running approx 3.5 psi of fuel even though my gauge sucks and doesn't give a accurate reading... (carter pump, holley fpr)

Well with the current setup im running I noticed that after a minute or so of high rpm agressive driving the Front header is getting red hot while the rear peice isn't... No matter how much I adjusted the air/fuel screws it didn't change this...

So im wondering if this problem is most likely my timing is off? What do you guys think too advanced or retarded? I just reset my timing a couple weeks ago to the 9 o'clock position on the front key and then I retarded the dist. a small amount by hand to where the engine sounded the smoothest.

Any suggestions on what I should do? What jet combinations I should be running or other tips?

Thanks guys I really appreciate it, its been a pain getting this weber tuned right but the results are amazing over the nikki...

Hyper4mance2k

iTrader: (40)

60 f9 for idle 190's on the main with those air correctors will be really rich, the 170's would be good economy, but kinda too lean for my liking... my recomendation is 180 main 165 air correctors... not sure on the e-tubes hope fully robert will chime also try searching. there are about 189231740987213409887 threads with alll the info you'll ever need....

Dan_s_young

iTrader: (1)

I forgot to mention this is a stockport 12a with full racing beat exhaust, does your jetting recommendations remain the same for it being a stockport? Robert is who I initally ordered some of the jets from and he said they should get me in the right ballpark for running well. I am still just wondering if the problem could be related to the timing because it is only on the front header that glows... And like I said no matter how much I tried to richen the fuel mixture the header still glowed so I assume me problem is timing related?

Paradox

iTrader: (1)

try full advance and see if you're header is still red-hot. also how is your charging system? you could be detonating from lack of proper spark

g'luck man. i know this has been a bitch of a project for ya!

SS124A

I agree completely.

depending on what your sea level is you may need to adjust the air corrector a a size... but the 180 main is at a good spot.

also are you using 1 #60 idle,, and 1 #55???? these really should match... I like my idles high.. for a few reasons... so maybe consider going to a 65...


I use a #70 in the IDA on my ported 12A using 38mm venturi for normal street driving.. starts right up, and is so sweet to drive around...

when going racing... (autoX, lapping, or dragging)
I swap in #75's or 80's base on ambient air temperature... these are too large for your application.. the 60/65 range is where you should be for idles.

Same idea with the E-tubes... are you mix matching them??

if so, STOP THAT.
I would not use the F7 tubes... they are tend to get really rich... but only way up in the power band... they are great for a race engine that has like a 2000 RPM idle... and a #95 idle jet.

as I recall the F16 emulsion tubes are special.. aren't they the ones that have the reverse flow... which are designed to increase fuel flow...

I have never played with a set of these... but i would imagine that it would cause a really RICH condition... and would therefore require huge air corrector to get enough air through the tube to atomize the fuel mix....

I like the little bubbles my F11's make

Dan_s_young

iTrader: (1)

Oh, lol another misunderstanding, im not mixing and matching these jets I was just posting the sets of jets I have in hopes someone could maybe point me towards the proper jetting setup. I ordered a set of f9-65's for idle jets but instead the company I ordered from sent f9-85's? that sucks... But anyways the car is going in for paint on Aug 2. so the jetting I have right now ill have to make work but im going to order some larger air corrector jets and I guess I will give the 180 mains a try!

Thanks for the tips guys, its really appreciated! Does anyone have any more advice? I should mention at this time this car is going to be used as a streetcar/racecar so a little economy would be nice but power is my primary goal!

And as far as the charging system goes the alternator has been changed like 6 months ago, the battery was also changed 6 months ago. New NGK plugs and wires, so the charging system should be up to spec. (although I should upgrade the alternator eventually because of the stereo)

moremazda

iTrader: (4)

F9-85 idle jets???? Weber doesn't make anything bigger than a 65 in the F9 idle.

A good base line (the one I use,and the guys above useas well)

65F9 idle
180-190 main fuel
150-160 main air
F-11 emulsion tubes

Also, it is very important to have the correct fuel pressure. Shoot for 3.5 psi, and fuel supply. I like to run a 190lph-250lph inline fuel injection fuel pump and an Aeromotive fuel pressure regulator.

Good luck
Ryan

Dan_s_young

iTrader: (1)

hmmm thats interesting with the idle jet because there is a slip of paper in with the jets that says the right size but on the jet itself it appears that it says f9-85?

Ya im currently running a carter fuel pump (from summit racing) at about 3.5 psi with a holley regulator but have sometimes noticed that the fuel pressure can be off (crappy gauge maybe).

I should maybe try some f-11 emulsion tubes as well, I was just reading another thread where Robert (rotaryshack) was suggesting to use a f-16 for economy and apparently it helps alot.

Dan_s_young

iTrader: (1)

well I just went out to try and see if the jets were f965's and the packaging says they are (slip of paper inside says so) but on the outside of the jet it clearly says f9-85. So I tried these idle jets anyways and the car ran mega rich so I stopped the car, and put back in the f9-60's and then the car wouldn't fire at all... So I pulled the plugs, a little flooded so I dried the plugs and turned the engine over to blow out the gas...

Still doesn't want to fire, I swear im cursed or something because the one header still glowed even when it was running super rich so that means to me it must be in the timing. This doesn't make sense though because the timing was reset from scratch to the stock position using the 9 o'clock positon of the keyway on the front of the engine...

Dan_s_young

iTrader: (1)

I should also mention that I pulled the plugs after running the car for a while with the new idle jets (f9-85) and the plugs are black... I was also going to mention that when I was running the 155 main jet the exhaust still smelled very rich. (very very rich...)

I need any help I can get at this point the car is going in for paint on Aug 2. and at this point it won't even start...

Dan_s_young

iTrader: (1)

Ok guys played around with it for a little while again..

With the f9-85 jet the engine flooded in a matter of minutes... flooded bad...
so I tried again with the f9-60 idle's and the car seems to get plugged up with gas for a while and only run off of one rotor but after you rev it up for a couple minutes it clears up.. Any idea where my jetting could be screwed up to cause this (I should mention this is with running a 145 main fuel jet, the 170 seemed like too much...) No matter what jetting I use the engine seems to bog big time (like I said I think its only running off one rotor) and I can't put my finger on what could be causing this...

I just replaced the spark plugs 1 week ago so I don't really want to replace them again..

Any suggestions guys???

fahqV8's

Remove the AirFilter and see if its causing restriction to the amount of airflow required at high rpms

Hyper4mance2k

iTrader: (40)

yep it's totally your timing! the 60f9's should work fine that's what I run in my car. 65 f9 would be better, but 60f9 works fine. ni said before to run your 170's on the main with the 155 air correctors. this should run perfect if is a 12a and if it's a 13b it'll be a little lean up above 5k. If your running what I tell you and you're still glowing it HAS to be your timing.