Motorsports Village
http://motorsportsvillage.com/forum/

1150 HP 2 Circuit conversion.
http://motorsportsvillage.com/forum/viewtopic.php?f=6&t=9316
Page 4 of 4

Author:  jmarkaudio [ Mon Aug 13, 2012 8:46 pm ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

Order some 2.75" bowl screws for it, they will engage a lot more. I've started to add them to all the rebuilds and new carbs.

Author:  SGDCXCVI [ Mon Aug 20, 2012 5:43 pm ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

jmarkaudio wrote:
Order some 2.75" bowl screws for it, they will engage a lot more. I've started to add them to all the rebuilds and new carbs.


Hey Mark,
are the 2.75" screws, hex head or screw driver slot?

Author:  jmarkaudio [ Mon Aug 20, 2012 6:35 pm ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

Hex. I have some from Braswell that are torx as well.

Author:  SGDCXCVI [ Mon Oct 22, 2012 5:26 am ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

Well guys, I finally got to test my two circuit conversion. I had to travel to Adelaide.
I was surprised at how much fuel the car DID NOT use. The amount of runs I did with driving to the start line and driving back, with the 3 circuit I would have used at least 40 litres.
I was lucky to use 20 litres. \:D/ \:D/
I pulled a plug and considering I drove to the start and back from the deep end, they looked pretty good.
The only issue I see, is I was racing Super Gas. When the stop comes on, the AFR goes rich then lean and then settles down.
My first thoughts are that maybe the cruise RPM is down to low and it's upsetting the carb.
I will include some photos and see what you guys think.
Cheers Colin.
Image

Author:  SGDCXCVI [ Mon Oct 22, 2012 5:57 am ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

I can't seem to get the pic of the plug to load.
The carb had good maners. It started, idled in or out of gear. it also went from idle to wide open as quick as I could mash it.
Cheers Colin

Author:  Beretta [ Mon Oct 22, 2012 6:49 am ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

What kind of stop are you using and looks like it's shifting on the stop?

Author:  SGDCXCVI [ Mon Oct 22, 2012 2:58 pm ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

Correct Barry, timer #1 is @ 0.01, timer # 2 @ 1.45 (on that run) shift @ 0.8 sec. I use a Dedanbear ts-6? Disc stop.

Author:  Beretta [ Mon Oct 22, 2012 5:49 pm ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

Well not sure what that will do to the O2 and it may be normal but I think Bruce (nomad) or could help you as he runs super street.. Thinking I would just run it wide open (no stop) and look at the afr to see how it is and tune from there for best MPH. Then put it on the stop and see what it does then.
What MPH does it run on the stop?? Is it faster than it was from previous timer settings?

Author:  SGDCXCVI [ Thu Oct 25, 2012 6:32 pm ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

I have one more Super Gas meet, the Nationals. It would be the equivelent of your US Nationals, this coming weekend. Then I have some 1/8 mile events that I can run the car all out.
I'm going to go back and re-read a few times the emulsion thread, there might be some relevant info in there.
I think I still might try raising the cruise rpm a little, hoping not to upset the afr as much.
I will report my findings.
Cheers Colin.

Author:  SGDCXCVI [ Thu Jan 31, 2013 4:26 am ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

Well I haven't had nuch of a chance to test lately. First weekend in January I travelled about 4 1/2 hours away to our 1/8th mile points meet.
Unfortunetlly I had problems, starter took a dump, also the radiator started to leak #-o #-o
I got so far behind getting the car fixed, I had to guess on my settings for first round. And of coarse I lost, broke out by .01. That's racing.
Anyway, when I got home I had some starter mods to do. I had the pipes off one side and I noticed how nice the exh ports looked, colour wise.
In one of the photos I lightly draged my finger in the port and you could see the black/rich colour underneath from the 3 circuit.
Remembering I was driving to and back from the run, no tow car.
My dash was showing 14/1 to 15/1 AFR idleing back, on the return road. \:D/ \:D/
I have been getting the idle speed v's ts exposure sorted out. I'm at 0.078" holes drilled in the butterflys and my idle and ts exposure is where I want it.
More updates to follow.
Cheers Colin.

Image
Image

Author:  Ken0069 [ Thu Jan 31, 2013 9:17 am ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

From the looks of that exhaust port, I'm surprised you haven't melted the headers off it on the return road!! O:) =; =; ;-)

Author:  Beretta [ Sat Feb 02, 2013 9:17 am ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

Ken0069 wrote:
From the looks of that exhaust port, I'm surprised you haven't melted the headers off it on the return road!! O:) =; =; ;-)



LOL!!!!!!!!!!!!!!!!!!

Author:  SGDCXCVI [ Sun Feb 03, 2013 6:42 pm ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

Ken0069 wrote:
From the looks of that exhaust port, I'm surprised you haven't melted the headers off it on the return road!! O:) =; =; ;-)


Hey Ken,
where does that come from? Who said it?
Obviously a 3 circuit dude.

Author:  Ken0069 [ Sun Feb 03, 2013 10:12 pm ]
Post subject:  Re: 1150 HP 2 Circuit conversion.

SGDCXCVI wrote:
Ken0069 wrote:
From the looks of that exhaust port, I'm surprised you haven't melted the headers off it on the return road!! O:) =; =; ;-)


Hey Ken,
where does that come from? Who said it?
Obviously a 3 circuit dude.


Guy named Patrick James (pro carb builder) posted that over on the Chevelles.com site back a few years ago when guys were talking about the 2 circuit conversion we were doing here. And yes, he's a 3 circuit guy.

Page 4 of 4 All times are UTC - 5 hours
Powered by phpBB® Forum Software © phpBB Group
http://www.phpbb.com/