Edelbrock 1806 Tuning
01-25-2011, 06:43 AM
#21
6th Gear Member
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
I forgot to mention this before. The vacuum gauge fluctuated a little. Is the vacuum gauge supposed to have a steady reading?
I figured the cam could cause a slightly rich idle, but the cam is not radical at all and is pretty mild.
I rebuilt the carb about 9 months ago even though it was only about a year and a half old and only had 3000-4000 miles on it because I had some major issues. I did it accoriding to Edelbrocks specs, so all of that should be good.
I figured the cam could cause a slightly rich idle, but the cam is not radical at all and is pretty mild.
I rebuilt the carb about 9 months ago even though it was only about a year and a half old and only had 3000-4000 miles on it because I had some major issues. I did it accoriding to Edelbrocks specs, so all of that should be good.
my idle fluctuates as well and I was worried the whole time that I have a problem with the valves (not seating etc). It does not seem to be the case. I haven't checked for ages, but I would be surprised if it's any different. I use the xe268H cam, I think you use performer rpm cam (which is supposed to have a better idle vacuum)
I'd love to convince myself that this is perfectly ok and blame the cam ...
video is half year old
http://www.youtube.com/watch?v=Vkz-B4eZ57I
Kalli
01-26-2011, 06:20 AM
#25
6th Gear Member
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
the inner bright yellow circle is psi, every mark 1 psi, the ones with the numbers (longer marks) are 5 psi steps. So I would say it's jumping between 12 and 15 and I have no idea what carb that was. either 570 holley street avenger or 650 demon. i was using both half year back. swapping them like a madman to see for the differences and what I could get to run better.Sorry
01-26-2011, 11:09 AM
#27
6th Gear Member
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
01-27-2011, 08:59 AM
#29
5th Gear Member
Thread Starter
Join Date: Dec 2008
Location: Texas
Posts: 4,462
I'm curious if there is such little difference in the metering rods and jets etc, how is the 600 Performer calibrated for fuel economy and performance, and the 650 Thunder AVS calibrated for moderate street performance? Would I be better off trying to setup my 650 as the 600?
EDELBROCK PERFORMER SERIES 600 CFM 1406, STREET LEGAL ELECTRIC CHOKE CARBURETORS
CALIBRATED FOR FUEL ECONOMY
50-state street legal for all 1980 and earlier General Motors V8s (E.O. #D-215-10). Calibrated for maximum fuel economy. Includes timed vacuum ports, EGR and fuel vapor outlet. Not for computer-controlled engines. Comes with the following jets, rods and springs: Metering Jets - Primary .098, Secondary .095; Metering Rods - .073 x .047; Step-Up Spring - orange (5" Hg).
EDELBROCK THUNDER SERIES AVS® 650 CFM 1806, CARBURETORS
Designed and calibrated for optimum street performance in small-block and some big-block engines. Match with a variety of manifolds that include Edelbrock Performer, Performer EPS, Performer RPM, RPM Air-Gap, Torker II and other brands of similar design. Includes: Metering Jets - Primary .095, Secondary .098; Metering Rods - .068 x .047; Step-Up Spring - Orange (5" Hg).
EDELBROCK PERFORMER SERIES 600 CFM 1406, STREET LEGAL ELECTRIC CHOKE CARBURETORS
CALIBRATED FOR FUEL ECONOMY
50-state street legal for all 1980 and earlier General Motors V8s (E.O. #D-215-10). Calibrated for maximum fuel economy. Includes timed vacuum ports, EGR and fuel vapor outlet. Not for computer-controlled engines. Comes with the following jets, rods and springs: Metering Jets - Primary .098, Secondary .095; Metering Rods - .073 x .047; Step-Up Spring - orange (5" Hg).
EDELBROCK THUNDER SERIES AVS® 650 CFM 1806, CARBURETORS
Designed and calibrated for optimum street performance in small-block and some big-block engines. Match with a variety of manifolds that include Edelbrock Performer, Performer EPS, Performer RPM, RPM Air-Gap, Torker II and other brands of similar design. Includes: Metering Jets - Primary .095, Secondary .098; Metering Rods - .068 x .047; Step-Up Spring - Orange (5" Hg).
01-27-2011, 09:56 AM
#30
5th Gear Member
Thread Starter
Join Date: Dec 2008
Location: Texas
Posts: 4,462
I was thinking that this heat insulator gasket might be a good idea. Its 0.320 inches thick and should help keep the carb cool in the warmer weather.
http://www.summitracing.com/parts/EDL-9266/
http://www.summitracing.com/parts/EDL-9266/