No doubt it will be better than ever in a few weeks.
New BG carb issues
Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 6,938
Likes: 1
From: San Diego CA
New BG carb issues
After all the problems I had and figured out and thought I had it dialed in, well good enough until LARS shows up the 6th of Nov. Well anyway the idle sits at 850RPM but after a long drive it idles at 1100 RPM. TOO HIGH!!
CHECKED
linkage, same if linkage is attached
intake leaks, none
vacuum 16"hg at idle
butterfly position- set .020 both
A/F 14/16 a turn out.
I'm stumped right now.
CHECKED
linkage, same if linkage is attached
intake leaks, none
vacuum 16"hg at idle
butterfly position- set .020 both
A/F 14/16 a turn out.
I'm stumped right now.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
is fuel percolating and increasing the idle???? do you have a heat shield? while your drivining is the air movement enough to stop this from happening????
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Brett Foote
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
yes thats what i mean, i guess it is the stage between a fluid and a gas and created by heat causing the fuel to expand. i don't know if that a scientific explanation but its what i'm thinking
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
i just fininished fabricating mine out of stainless steel, the only problem is the bends to clear the accereratol pump turned out to be about 5/8-3/4 of an inch, i was aiming for 3/8 - 1/2 ... i hate bending sheet steel.... oh well i guess a 1/2 phenolic riser may be in the equation. let me know now it turns out, My fear is that if I wind up using a spacer that it will create problems with air cleaner/hood clearnance. thks bob
Safety Car
Joined: Jul 2002
Posts: 3,770
Likes: 3
From: St Louis MO
The mysterious creeping idle has happened to me too. I just idled it down and it stayed put after that.
Something else I learned the hard way. Keeping the transfer slots equal never worked for me. I found out by trial and error that I got the best off-idle response with a certain amount of the primary slot showing. After I found that sweet spot, I left the primary alone. I then adjusted the idle with the secondary screw only. So, you'll have 2 very different setting on each throttle blade. You might want to try it. It worked for me.
Brett
Something else I learned the hard way. Keeping the transfer slots equal never worked for me. I found out by trial and error that I got the best off-idle response with a certain amount of the primary slot showing. After I found that sweet spot, I left the primary alone. I then adjusted the idle with the secondary screw only. So, you'll have 2 very different setting on each throttle blade. You might want to try it. It worked for me.
Brett
Thread Starter
Le Mans Master
Joined: Jan 2001
Posts: 6,938
Likes: 1
From: San Diego CA
