1150 dominator Questions

[Tom Goldman]

Originally Posted by Floyd Staggs

Tom, OT, I just got one of them F.A.S.T. air fuel ratio recorders, their instructions leave a little to be desired. Do you know how to adjust the carburetor to get the desired numbers? What are the desired numbers?

A/f meters are great at showing you where the ratio is in relation to the car on the track. ....BUT correcting the fuel curve can be tricky. ...Most of the real experts I've talked to recommend 12.2 to 1 as a safe a/fr to shoot for ,but the car may want to lean out more as you progress down the track,and some cars work better with a much richer ratio at the starting line...........Jetting ,air bleeds and ignition timing all come into play. ...That why its best to establish a base line on the dyno before tuning on the track. .......If the a/fr is in a safe area, I'd start by moving the ign timing to see if it is covering any jetting deficencies...........Tom

[Floyd Staggs]

Thanks, Tom,
I'm just looking to keep it consistent and try to keep up with the changes in the weather.

[Bob Alberty Jr.]

Ok here is the latest.
Tom the air bleeds have been messed with at some point in this carbs life. I only brought a small selection of guage pins home, the largest being a .030, and it will fall in and wiggle, I have a few 1050's to choose from,thank goodness for friends, so we will try it next friday night with less carb. Any particular list number I should look for?
I went ahead for the sake of nothing better to do, and added 7.5 power valves, and pulled the jets back to 95's, and it idles continuouse By that I mean the rythem prior to today would change as it idled, meaning {roll your "R"s} rowd rowd rowd rowd rowd then it would change tone for a few seconds and eventualy go back, now it just sits there with the rowd rowd sound never fluctuating, it ran for 15 minutes just now.And didnt build heat over 175.
I will get the 1050's on it and see what it changes. Thanks for all your help.

[Rich Biebel]

A 9375 is a good 1050 to look for and try.....They run well and jetting should be 92's as a baseline. Anywhere from 88 to 94 is a normal jetting range on those. Holley's generally do the Holley "gurggle" and it is pretty normal.....If it holds a steady rpm without sinking it is ok....If it loses rpm after it runs a while and goes back up after you rev it a few times...it's too rich...fixing that is not always just a matter of an adjustment.......Too big a carb or cam or both often slows a car down......

[Floyd Staggs]

Got my meter put on this morning, it is way fat, 9.8 idle. Gonna drop back to 92's and then wait to make a pass at Phoenix next Thursday and go from there.

[Bob Alberty Jr.]

Well my changes did not work. Luckily one of my friends with a 1050 showed up. It happened to be a 9375 too. Bolted it on after the first time trial, and didnt even have to re-set the floats. Put the car back into the 6.50's (1/8th mile) picked up 1 mph, but the differance in throttle response is night and day. I used to have to realy get after the pedal to do the burnout, but not now,almost overwound it in low,backed off and shifted,let it pull down then got back in the gas in high gear and almost overwound it again. I think I have the 1150 traded off for a 1050,will find out later this week as I have to give the current 9375 back.

Thanks for the help. The car is much happier.

[Bob Alberty Jr.]

She is a hotrod again,

Talked with one of the big carb guru's on the phone for a lil while this afternoon, he talked me through this 1050 carb. It was loaned to me, with the option of trading the 1150 I have been running. I made my decisions, and set it up on the bench as a 3 circuit for the time being, put it on the car and she started and idled. Gained one and a half inches of manifold vacuume over the 1150. I added a round on each of the fuel / air screws from my bench setting for my highest reading ( out 2.5 turns each). I set the throttle blades at .020 t-slots showing prior to installation, and never changed them, also did not drill the blades. She idles at 1400 rpm clean. Goes against the chip clean, free revs clean, The exhaust note is so different my teenage daughter Sami came out to see what I had changed, and the neighbors eyes sure got large when she black tracked down the driveway. We will see how she runs friday night here in Tulsa, before heading to Sallisaw on saturday.

Thanks everyone.