.060" spark plug gap?

[Indian Outlaw]

when you say flat thru the mid on up do you mean the a/f ratio stayed at say, 13 at 3000 and 13 at 5500? My dominators are lean in the mid range and fatten up on the top due to the power valves i presume.

Oh yeah, i run .038" gaps, with tbolt ignition and blowers. No misfires i can detect.

well goodie for you!!

[Airpacker]

I only had about 20 hrs of fine tuning in my dominator / Victor jr intake on a 540. Sucker would idle all day long and never foul a plug. The PITA is drilling air bleeds to JUST the right size. Had a few ooops, too big episodes but, in the end the carb was perfect. Idle, mid and WOT.

It just takes some serious time and lots of trial and error to get them right.

[MikeyFIN]

Mika,,,i know u know alot ,,but stop it .

If u order a new 1050 dominator MARINE carb it is dialed in +2 on the rich side.
End of discussion.

Agreed and Gotcha. just the way I like it. Rather change plugs than valves...

Regarding Patriyachts case I´d say his power valve comes on a bit late ?

[MikeyFIN]

I only had about 20 hrs of fine tuning in my dominator / Victor jr intake on a 540. Sucker would idle all day long and never foul a plug. The PITA is drilling air bleeds to JUST the right size. Had a few ooops, too big episodes but, in the end the carb was perfect. Idle, mid and WOT.

It just takes some serious time and lots of trial and error to get them right.

My Dad´s a goldsmith so I usually go and get his small reamers to do the job... you can go one thousand of an inch up...
Shhhh... don´t tell him.

[PatriYacht]

When you say flat thru the mid on up do you mean the a/f ratio stayed at say, 13 at 3000 and 13 at 5500? My dominators are lean in the mid range and fatten up on the top due to the power valves I presume.

Oh yeah, I run .038" gaps, with tbolt ignition and blowers. No misfires I can detect.

Not exactly but sort of. Originally I was up to 98 jets and the top end was still a little lean while mid range was rich. With the air bleed change, I was able to drop down to 92's and the top end and mid range were good.

Power valves add 6-8 jet sizes. Changing them changes when they open but not how much fuel they pass. At wide open throttle they all add 6-8 jet sizes and that wasn't enough. Btw, new Dominators come with removable air bleeds. You can change them just like jets.

[MikeyFIN]

OK so you left the power valves to open late to richen the top end ?

[Geronimo36]

Power valves add 6-8 jet sizes. Changing them changes when they open but not how much fuel they pass.

Zul taught my buddy a trick with that.... he drills the orfice in the metering block where the power valve goes!

Mid-range on this particular engine was perfect but needed a tad more up top (when PV opens) so he drilled it out larger and it was perfect!

[2112]

Zul taught my buddy a trick with that.... he drills the orfice in the metering block where the power valve goes!

Mid-range on this particular engine was perfect but needed a tad more up top (when PV opens) so he drilled it out larger and it was perfect!

I believe Nickerson will do that for those of us who only adjust and idle screw.
.

[PatriYacht]

OK so you left the power valves to open late to richen the top end ?

Yes

[MikeyFIN]

Zul taught my buddy a trick with that.... he drills the orfice in the metering block where the power valve goes!

Mid-range on this particular engine was perfect but needed a tad more up top (when PV opens) so he drilled it out larger and it was perfect!

That goes into fine tuning and yes it´s really a delicate tune to do to get your engine just right.

[Geronimo36]

I'm happy to say I have learned a lot of tricks from some of the best in the business over the years and apply them on my own!!

[MikeyFIN]

Same goes here.... something you don´t learn in the Universities...