Does a carb spacer really help
11-17-2009, 07:19 PM
#1
4th Gear Member
Thread Starter
Join Date: Aug 2008
Location: Goodyear, AZ
Posts: 1,674
Does a carb spacer really help
i added a 1" to my set up. at the same time i also added octane booster. I am not sure which of the two made a diff but it was really noticable.
However, it ended up hitting my hood. so i removed it. I am going add a 351 scoop and cut out the hood so it will clear in the future, but does it really make a big diff?
However, it ended up hitting my hood. so i removed it. I am going add a 351 scoop and cut out the hood so it will clear in the future, but does it really make a big diff?
11-17-2009, 08:20 PM
#2
4th Gear Member
Join Date: Jun 2006
Location: Upland, California
Posts: 1,246
It terms of what?
It did a huge difference for me in terms of heat dissapation so my fuel NEVER boils over in the summer. And you living in arizona would have this problem way more than californias 105 degree summer days. I can start my car on a 105 degree day without it dying.
As for performance wise I noticed maybe a little bit of difference in peddle responsiveness but it might have just been all in my hand
I had to trim my air cleaner riser and my air cleaner wingnut to make everything fit.
It did a huge difference for me in terms of heat dissapation so my fuel NEVER boils over in the summer. And you living in arizona would have this problem way more than californias 105 degree summer days. I can start my car on a 105 degree day without it dying.
As for performance wise I noticed maybe a little bit of difference in peddle responsiveness but it might have just been all in my hand
I had to trim my air cleaner riser and my air cleaner wingnut to make everything fit.
11-18-2009, 06:31 AM
#5
6th Gear Member
Join Date: Oct 2006
Location: Cork, Ireland
Posts: 6,417
phenolic 1" spacer worked wonders for me and friend of mine.
my problem was after car switch off fuel would vaporize, carb would get really hot and very hard to start. my buddies carb got so hot in idle just standing there that the car cut out.
I bought that one from summit. comes with studs (the right size) and bolts. I just bought 2 gaskets with it. the lower one i left completely open and the top one to match the 4 holes
http://www.summitracing.com/parts/EDL-8711/
(the two gaskets actually show op on right hand side).
my problem was after car switch off fuel would vaporize, carb would get really hot and very hard to start. my buddies carb got so hot in idle just standing there that the car cut out.
I bought that one from summit. comes with studs (the right size) and bolts. I just bought 2 gaskets with it. the lower one i left completely open and the top one to match the 4 holes
http://www.summitracing.com/parts/EDL-8711/
(the two gaskets actually show op on right hand side).
11-18-2009, 07:09 AM
#6
4th Gear Member
Join Date: Jun 2006
Location: Upland, California
Posts: 1,246
phenolic 1" spacer worked wonders for me and friend of mine.
my problem was after car switch off fuel would vaporize, carb would get really hot and very hard to start. my buddies carb got so hot in idle just standing there that the car cut out.
I bought that one from summit. comes with studs (the right size) and bolts. I just bought 2 gaskets with it. the lower one i left completely open and the top one to match the 4 holes
http://www.summitracing.com/parts/EDL-8711/
(the two gaskets actually show op on right hand side).
my problem was after car switch off fuel would vaporize, carb would get really hot and very hard to start. my buddies carb got so hot in idle just standing there that the car cut out.
I bought that one from summit. comes with studs (the right size) and bolts. I just bought 2 gaskets with it. the lower one i left completely open and the top one to match the 4 holes
http://www.summitracing.com/parts/EDL-8711/
(the two gaskets actually show op on right hand side).
11-18-2009, 07:34 AM
#7
6th Gear Member
Join Date: Feb 2007
Location: state of confusion
Posts: 7,635
Spacers also add plenum volume and can affect mixture distribution. It is also possible for a spacer to increase the flow that the engine actually sees, since this depends on more than just the carb rating.
The best spacers are the tapered ones. Apparently they're good enough that some racing organizations have outlawed them for some classes (in circle track racing, I think, but don't hold me to it).
Very approximately, a tapered spacer goes from being a four hole spacer at the top (carb base) to an open or nearly open spacer at the bottom (manifold). There's more explanation at the bottom of this page. Like any other piece of advertising, I wouldn't place much importance on the numerical claim ("as much as 110 cfm" in this case), since you don't know the circumstances under which that was observed (and I highly doubt that their 110 cfm gain was measured with a 600-ish cfm carb on a 289/302 with OE heads).
Norm
The best spacers are the tapered ones. Apparently they're good enough that some racing organizations have outlawed them for some classes (in circle track racing, I think, but don't hold me to it).
Very approximately, a tapered spacer goes from being a four hole spacer at the top (carb base) to an open or nearly open spacer at the bottom (manifold). There's more explanation at the bottom of this page. Like any other piece of advertising, I wouldn't place much importance on the numerical claim ("as much as 110 cfm" in this case), since you don't know the circumstances under which that was observed (and I highly doubt that their 110 cfm gain was measured with a 600-ish cfm carb on a 289/302 with OE heads).
Norm
Last edited by Norm Peterson; 11-18-2009 at 07:48 AM.
