Dominator Carb in Supergas
 

Hi Guys, Can anyone tell me if there are any problems with running a Dominator carb on a Supergas car ?. Are there any modifications or adjustments that need to be done to these carbs ?. I have one on a BBC 555 cube, approximately 900 hp, 1150 cfm. I have been told it will not run properly on the stop. I have no info on what settings it was set up at. I have no info on carb settings yet.
Thanks Patrick.

Re: Dominator Carb in Supergas
 

Hopefully a few guys will chime in. A friend of mine runs a dominator in SST on his 421 sbc. It was worth a couple mph over his 950 Holley. I dont recall him ever having an "issue". And I believe he used an adapter.

Re: Dominator Carb in Supergas
 

I run a 1050 dominator that has been reworked to flow 1150+ on a 565 with no problems. I use an inline throttle stop and the only suggestion is th make the secondaries 1:1 with the primaries. it will be more consisent on the stop.

Bob

Re: Dominator Carb in Supergas
 

Hi Bob, the car runs a Dedendear under carb stop. I have purchased the car complete but do not have it at my place yet to be able to check everything. Have you ever heard of Smith Brothers Chassis, they had a shop in the Massachusetts area. They built Pro Stock cars back in the .90's. I believe they sold out to some one but am unable to find out anything. The car i bought is a 1990 Beretta Pro Stock car built by Smith Bros. Thanks Patrick.

Re: Dominator Carb in Supergas
 

Patrick, talk to Colin he has his working well after he completed his 2 circuit conversion on his dominator

regards
Rod

Re: Dominator Carb in Supergas
 

Hi Rod, thanks, as i am new on here how do i find Colin ?. Again not sure of what i have until i get the car, about four and a half weeks before i take delivery of it. Thanks Patrick.

Re: Dominator Carb in Supergas
 

check your phone :-)

Re: Dominator Carb in Supergas
 

I don't think that I actually know anyone that doesn't run a dominator in SG.. hopefully when you get the car, it will come with the log book and you will find all of the throttle stop settings in the book.. IF NOT, don't panic.. if I can do it, anyone can do it.. and don't be afraid to ask questions of your local SG racers.. that's how I'm still learning...

Re: Dominator Carb in Supergas
 

The carb that most run would be a 1050, 3 circut that has been modified in the intermediate circut so as to be consistant on the stop. Most believe that anything bigger than a 1050 will suffer some with the signal coming thru the boosters coming off of the stop and consistancy will suffer. My engine made 1182 hp on the dyno and that was with a 1050
Chuck

Re: Dominator Carb in Supergas
 

Chuck is very close on his assessment , How ever the trend is, my engine runs well on the stop with a 1250 Quick Fuels tuned Carb. My RPM's are dead on @4000 and my car runs fairly consistent- I just don't know how to drive anymore !

Re: Dominator Carb in Supergas
 

I agree that a properly prepped carb of any size will work, I ran a 1250 for years on mine. In order to get it consistant coming off of the stop though, we had to run skirts on the boosters in order to get a consistant signal through the carb. The 1050 seems to be a little better at having a consistant signal. I would probabley run a little more mph with a 1250, but for the most part, I am happy with the 1050
Chuck

Re: Dominator Carb in Supergas
 

Chuck,
I have a Quick Fuels reworked 1050 for my super gas 565 from a few years ago. Since I installed an O2 sensor, I found a very lean idle condition and getting info from them on air bleed tuning is like pulling teeth. Did they provide you with any tunning advice?

Bob

Re: Dominator Carb in Supergas
 

Hi Guys, Thank you for the replies. What type of throttle stop do you guys run ?. Under carb or inline ?. The 1050 carbs that you run are they 2 circuit or 3 circuit ?. Have read a story that you need to richen up the intermediate circuit to run on the stop. Hmmm, 1182 hp with a 1050, thats is pretty stout !. Thanks again for the replies, 3 1/2 weeks till my car gets here cheers Patrick.

Re: Dominator Carb in Supergas
 

I run a 3 circuit 1050 (modified for increased cfm) with an inline stop.

Bob

Re: Dominator Carb in Supergas
 

Be Careful messing with Air Bleeds without proper advice- Call Marvin at Quick Fuels - Mine is a little on the fat side but my Motor likes it that way. Look at your Plugs- they tell all, it might be lean at idle and ok on the high speed side, Research and Read !

Re: Dominator Carb in Supergas
 

3 circuit with an under the carb stop.
Chuck

Re: Dominator Carb in Supergas
 

Patrick, have you been able to find any further info on Smith Brothers Chassis or build details of your car

regards
Rod

Re: Dominator Carb in Supergas
 

Hi Rod, No nothing a s yet. I thought Bob from Massachusetts may have heard of Smith Brothers Chassis as he comes from that area also. Or maybe anybody that remembers Pro Stock from the early .90's. I did speak to a guy at Lebanon Valley raceway and he remembered them , but did not know who took them over or bought them out.
Cheers Patrick. 2 1/2 weeks to go.

Re: Dominator Carb in Supergas
 

I did hear of Smith Brothers but that was quite a while ago. I do not know who, if anyone, had taken over.

Bob

Re: Dominator Carb in Supergas
 

Smith Bros. Race Cars was located in Brockton Ma. Fred Smith sold The shop to John Ondrejko of John's Racecraft. John is still building race cars there. His Number is 508.580.2576 or http://www.johns-racecraft.com/

Re: Dominator Carb in Supergas
 

Hi Bob, Thank you , I have sent John an email and photo of the car to see if he has any records from the Smith Bros. days. Something may come up, thanks again , cheers Patrick.

Re: Dominator Carb in Supergas
 

John' Racecraft is a good shop.

Re: Dominator Carb in Supergas
 

Nothing at all wrong with a Dominator in any of the Super classes when they are set up right and not overkill for the engine. The right boosters help, they can improve signal and recovery when the stop comes off. As far as 2 or 3 circuit, it really depends on the stop type, engine airflow, and RPM run while on the stop. For most a 2 circuit works very well and is very stable on and coming off the stop. Inline stops I would always use a 2 circuit. I have not messed with a disc stop but it should be fine as well, pulling fuel and air though the center. On an under carb blade stop a 2 circuit usually works well, but it depends on how far the blades are closed. If it's a large engine that pulls a lot of air and runs the set RPM with the blades closed far enough, or the RPM is set too low, the boosters are not able to provide a stable fuel delivery. And with the stop blades well below the idle and transition metering they are unable to provide enough fuel either. This can cause the RPM to flutter on the stop. Having intermediate fuel in this case can make an improvement, but it doesn't need to be much to do it. Excessive intermediate fuel is never wanted or needed, it will only hurt consistency and performance. It was originally added to work with individual runner engine where the runner pulsing is not dampened like it is with a plenum style intake. The pulses disrupt the booster signal at part throttle, so intermediate fuel is added to fill in the hole. If you chose to go to a 3 circuit BLP wide body metering blocks are the only ones I will use. The idle circuit uses no tubes in the main wells, and they allow the idle feed restriction to be located at the bottom of the main well.

Re: Dominator Carb in Supergas
 

Hi Guys, Finally got the Beretta home and have had a quick look at the Dominator carby. I have not pulled it down to see what jets and air bleeds etc.are in it yet but will do that in the next couple of days. The part no. on top of the carby reads, 12R-9027B. there is also another number 1713 on the top. is this a Gasoline carby or a Methanol carby ?.

P.S. Johns Racecraft did not have any information on any cars built at Smith Brothers Chassis.

Thanks again for your help, Squirrell.

Re: Dominator Carb in Supergas
 

That should be a non-HP 1150 casting, the list number on top should be a 7320 or 9377 unless it was a custom built carb using a bare casting. If you can post a picture of the main body side of the metering block, I can tell you if it's 2 or 3 circuit. If it is a stock unmodified carb I would suggest getting it reworked, with the right mods it will work fine on the throttle stop. I have a pair of the old style 9377's one on gas, one on E85, both work fine on the stop. It should look like the 1050 in my picture below.

Re: Dominator Carb in Supergas
 

Hi Guys, here are some photos of the carby.
http://i1067.photobucket.com/albums/...psf6f5e014.jpg
http://i1067.photobucket.com/albums/...ps414e313b.jpg
http://i1067.photobucket.com/albums/...psd90bde76.jpg

Can anyone tell me if this is a petrol carby or methanol carby. I did not find a listing for it on the Holley site. I have emailed them with the same questions. Thanks for your help, Squirrell.

Re: Dominator Carb in Supergas
 

Patrick

is there any numbers stamped in on the other side of the carby

the 12R number I believe is a casting number

regards
Rod

Re: Dominator Carb in Supergas
 

It could be set up for alcohol based on the fuel bowl extensions.

bob

Re: Dominator Carb in Supergas
 

Hi Rod , I could not find any numbers on either side of the carby. There are some numbers on the throttle arms, 1549 on the primary arm and 1480 on the secondary arm . I sent an email to Holley and they asked the same questions. Cheers Patrick.

Re: Dominator Carb in Supergas
 

Pull a bowl and look at the jet size. I'm inclined to believe it's methanol as well with the bowl extensions, but I have seen someone build a gas carb with a secondary extension... not what I would use on either gas or methanol.