Carburetor spacers
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'm using a 1/2" phenolic spacer and heat shield with the speed demon...have not done any experimenting with it, but i'm happy with how it runs....in fact i wasn't far from you today with the vette i just kept heading south after i dropped one of the kids at school....
Team Owner
Joined: Jul 2001
Posts: 182,997
Likes: 88
From: Lakeland, FL
Cruise-In IV-V-VI-VII-VIII Veteran
St. Jude Donor '03, '06, '17
I use a 1/2 inch spacer right now...
I've seen many dyno runs with spacers.. and on big cammed engines, the spacers can make a huge difference.... I've seen 25+ HP difference with 1 - 2 inch spacers... However, the RPM range will shift and you might actually looks power and torque at lower RPM but will gain at higher RPM...
I've seen many dyno runs with spacers.. and on big cammed engines, the spacers can make a huge difference.... I've seen 25+ HP difference with 1 - 2 inch spacers... However, the RPM range will shift and you might actually looks power and torque at lower RPM but will gain at higher RPM...
Melting Slicks
Joined: Dec 2001
Posts: 2,025
Likes: 1
From: Billings MT
Yes, actually. I have tested the following spacers at the drag strip:
1/2" 4 hole phenolic spacer
1/2" open phenolic spacer
1" open spacer
2" open spacer
2" four hole spacer
2" High Velocity Heads (HVH) Super Sucker spacer
The 1/2" 4 hole spacer is what I use on the street as it made tuning the idle circuit on the Mighty Demon easier (BG suggests this). It also made off idle and part throttle response cripser.
I have run all my best ET's and MPH with the HVH spacer, they say its good for .1s and 2mph, and I would have to agree with that. I have seen the same spacer pick up .1s on a 9 second car, so they do work.
The 2" four hole spacer also worked well with my motor, results will vary so the best option is to try it out and see...
1/2" 4 hole phenolic spacer
1/2" open phenolic spacer
1" open spacer
2" open spacer
2" four hole spacer
2" High Velocity Heads (HVH) Super Sucker spacer
The 1/2" 4 hole spacer is what I use on the street as it made tuning the idle circuit on the Mighty Demon easier (BG suggests this). It also made off idle and part throttle response cripser.
I have run all my best ET's and MPH with the HVH spacer, they say its good for .1s and 2mph, and I would have to agree with that. I have seen the same spacer pick up .1s on a 9 second car, so they do work.
The 2" four hole spacer also worked well with my motor, results will vary so the best option is to try it out and see...
Last edited by VETDRMS; May 3, 2005 at 09:54 PM.
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
Originally Posted by bobs77vet
i'm using a 1/2" phenolic spacer and heat shield with the speed demon...have not done any experimenting with it, but i'm happy with how it runs....in fact i wasn't far from you today with the vette i just kept heading south after i dropped one of the kids at school....
Well I"ve got the day off tomorrow and myself and about fifteen other guys and their cars have rented Atco for the day so I'm really loking forward to a good test and tune day there. I also have a 1/2" phenolic spacer and removed it to check the slots on the Demon. The gaskets really get stuck on the spacer, had to scrape them off and install new ones. I'm thinking of changing manifolds and going to an air gap for better cooling, eliminating the spacer which might give me more room for a larger K&N element say 14" x 4".....your thoughts?
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by 73jst4fun
Hi Bob,
Well I"ve got the day off tomorrow and myself and about fifteen other guys and their cars have rented Atco for the day so I'm really loking forward to a good test and tune day there. I also have a 1/2" phenolic spacer and removed it to check the slots on the Demon. The gaskets really get stuck on the spacer, had to scrape them off and install new ones. I'm thinking of changing manifolds and going to an air gap for better cooling, eliminating the spacer which might give me more room for a larger K&N element say 14" x 4".....your thoughts?
Well I"ve got the day off tomorrow and myself and about fifteen other guys and their cars have rented Atco for the day so I'm really loking forward to a good test and tune day there. I also have a 1/2" phenolic spacer and removed it to check the slots on the Demon. The gaskets really get stuck on the spacer, had to scrape them off and install new ones. I'm thinking of changing manifolds and going to an air gap for better cooling, eliminating the spacer which might give me more room for a larger K&N element say 14" x 4".....your thoughts?
whats ATCO and where is it?
those air gaps look cool, not sure if it will eliminate the need for some sort of heat barrier, i'm always amazed at how hot everything gets in the engine compartment and still continues to work properly..
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
Originally Posted by VETDRMS
Yes, actually. I have tested the following spacers at the drag strip:
1/2" 4 hole phenolic spacer
1/2" open phenolic spacer
1" open spacer
2" open spacer
2" four hole spacer
2" High Velocity Heads (HVH) Super Sucker spacer
The 1/2" 4 hole spacer is what I use on the street as it made tuning the idle circuit on the Mighty Demon easier (BG suggests this). It also made off idle and part throttle response cripser.
I have run all my best ET's and MPH with the HVH spacer, they say its good for .1s and 2mph, and I would have to agree with that. I have seen the same spacer pick up .1s on a 9 second car, so they do work.
The 2" four hole spacer also worked well with my motor, results will vary so the best option is to try it out and see...
1/2" 4 hole phenolic spacer
1/2" open phenolic spacer
1" open spacer
2" open spacer
2" four hole spacer
2" High Velocity Heads (HVH) Super Sucker spacer
The 1/2" 4 hole spacer is what I use on the street as it made tuning the idle circuit on the Mighty Demon easier (BG suggests this). It also made off idle and part throttle response cripser.
I have run all my best ET's and MPH with the HVH spacer, they say its good for .1s and 2mph, and I would have to agree with that. I have seen the same spacer pick up .1s on a 9 second car, so they do work.
The 2" four hole spacer also worked well with my motor, results will vary so the best option is to try it out and see...
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
Originally Posted by bobs77vet
whats ATCO and where is it?
those air gaps look cool, not sure if it will eliminate the need for some sort of heat barrier, i'm always amazed at how hot everything gets in the engine compartment and still continues to work properly..
those air gaps look cool, not sure if it will eliminate the need for some sort of heat barrier, i'm always amazed at how hot everything gets in the engine compartment and still continues to work properly..
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by 73jst4fun
....since I removed the license plate and put the OEM front center grill in the temp has gone down, not that I had a cooling problem, but that plate blocks alot of air to the engine....
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
Originally Posted by bobs77vet
thks... you know i don't have heating/cooling problem and i do not have that "pan/shield/valance" under the front of the car...wonder if that makes a difference either way?
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by 73jst4fun
Bob, I've heard many guys say the valance/small spoiler directs air into the engine compartment and stabilizes the front end......
one more thing to buy....maybe i should custom make one that looks like something out of "deathrace 2000"....remember that fine piece of cinematography
Thread Starter
Drifting
Joined: Nov 2002
Posts: 1,951
Likes: 1
From: Shore NJ
Originally Posted by bobs77vet
one more thing to buy....maybe i should custom make one that looks like something out of "deathrace 2000"....remember that fine piece of cinematography
Race Director
Joined: Nov 2000
Posts: 11,872
Likes: 12
From: Waterloo ontario Canada
Spacer are used to fix a problem between the carb and intake. They are slightly mismatched so we add a spacer. If the carb is too small and the plenum too shallow the air/fuel mixture hits the floor causing fuel seperation. A spacer in this case raised the carb giving the mixture more chance to make the turn into the intake runners.
A oversize carb has a lower velocity so it is not bothered by fuel seperation or hitting the plenum floor.
I have seen dyno results where adding a spacer took away torque and power.
It is hard without a dyno to test spacer. Well maybe back to back runs at the track but seat of the pance can be deceiving.
A oversize carb has a lower velocity so it is not bothered by fuel seperation or hitting the plenum floor.
I have seen dyno results where adding a spacer took away torque and power.
It is hard without a dyno to test spacer. Well maybe back to back runs at the track but seat of the pance can be deceiving.
Race Director
Joined: Sep 2004
Posts: 11,874
Likes: 263
From: Arlington Va Current ride 04 vert, previous vettes: 69 vert, 77 resto mod
Originally Posted by 73jst4fun
Fine indeed...just add spikes....was that David Caradeen (spelling)..
one rhino horn coming up, right between the middle of the lights....
