301t Won't idle

[canadian nascar]

Hi Cliff,

i had my 301t built 8.5 comp, 262comp cam, roller rocker vt. i am having trouble getting it to idle, it will for awhile in park the it dies off and won't idle in drive. the exhaust is very smelly

i called you, Cliff the other day and you told me that my ilde tubes and channels are to restictive. can i just remove, then drill them out? or should i buy them?

you told me to look at the upper end of ilde mod reicipe #2

also i bought #77 jets in it and it runs good, but was wondering if they are enough and maybe should try some bigger ones?

thanks kevin

[canadian nascar]

the carb was rebuilt last year

thanks kevin

[Cliff Ruggles]

The main jets have no effect on idle quality.

In most cases the idle tubes can be removed and re-used.  If not, we have new ones available.....Cliff

[canadian nascar]

thanks for your help Cliff,

will do some disecting this week. i now understand if i do need mure fuel to use the APT screw during part thottle instead of changing jets.

kevin

[Cliff Ruggles]

Correct, the APT screw raises the height of the metering rods.  This only increases fuel delivery at part throttle/high vacuum.  Fuel delivery at heavy/full throttle remains the same....Cliff

[canadian nascar]

Hi Cliff,

with the APT screw in is rich out is lean. I would like to know is for every full turn in how much of a jet size might i be increasing? or is it not known?

thanks kevin

[canadian nascar]

Hi Cliff,

read abit closer and understand the apt raises the rods not creating larger jets.

i was talking to a fellow 301t and he has 110 needle and seat are these avalible? and also you made a pair of secondary rods last year for me like dx rods but he is running ay rods which are richer?

removed my idle tubes and drilled them, the recipe you offered was #2 i didnt find .038 drill bit but found a .042 and tried it and it seems fine. it idles now in park and almost in gear, i just have to adjust the idle speed and screws abit more.

[Cliff Ruggles]

We have .110" seats, .125's, .130's, .135's, .145's and .149's.

We also sell new idle tubes in any size you would want....Cliff

[canadian nascar]

Hi Cliff,
if the local boys can get me .145 needle seat will this give me any problems or should it be more application specific?

i am trying to learn how to make sure the secondaries are opening all the way. i have read from your book that emisson carbs like like mine are restrictive. so i might have some questions on that one.

thankyou kevin

[canadian nascar]

hi Cliff,

i am looking to open up the secondaries as i have some pinging and want to make sure i am getting all the fuel i can.
could you lead me the right way,

k hanger, custom dx and 77 in the primaries.

can run 5-6 lbs with gas only, did a test with water meth off, normally run 12lbs with water meth injection

thanks kevin

[Cliff Ruggles]

Detonation on turbo engines is NOT a good thing.

You may need to pull out some timing as more boost is added. 

How did you end up with .077" main jets, those are HUGE for that carburetor?

The only time you need a large needle seat assembly is when you aren't able to keep the carb full on hard runs.  Sometimes a better fuel delivery system is needed, in lieu of a larger inlet seat.

I would doubt the little 301 would require a large needle/seat assembly, and is probably fine with a stock fuel pump/lines, etc.

Is there any evidence of running out of fuel on hard runs?.....Cliff

[canadian nascar]

Hi Cliff,
i purchased a sr kit, idle tubes, extra gaskets but air bleeds were sent with my package instead of the channel tubes for my 301t, do i reorder them channel tubes or don't worry about it?

should i put these recipie 2 air bleeds in or not?

i hope you have enough info on this post.

also stock came with 71 jets and i just bought 75 and 77 jets, tried them and 77s seem to be fine. doesn't flood or anything.

kevin

[Cliff Ruggles]

Idle downchannel restrictions and the main airbleed restrictions are the same part.....Cliff

[canadian nascar]

thanks again

kevin

[Cliff Ruggles]

The airbleeds (idle downchannel restrictions) have a very small hole in them, apprx .045", unless we pre-drill them.

They can be used at either location, for upper-lower main airbleeds, or for idle down-channel restrictions.....Cliff