Carb spacer question....
Thread Starter
Drifting
Joined: Jan 2002
Posts: 1,484
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From: Northampton Ma
Carb spacer question....
I was thinking of running a 1" spacer with an additional vacuum port on my new 383, I did the math and I can definately fit it under the stock hood. My question is, do carb spacers move the powerband up in the rpm range, and if so, how much would a 1" spacer move it up :confused:
Drifting
Joined: Jan 2002
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From: N.Y
Re: Carb spacer question.... (comp)
I added a 4 hole spacer (holly) It seems to have gave me more mid range tork. I don't think I lost anything on bottom end I should do another G Tech run with out it. Currently ran a 12.52 at 112 mph. :auto:
Le Mans Master
Joined: Feb 1999
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From: Hoosier
Cruise-In III Veteran
Re: Carb spacer question.... (78 Vette)
It's said that a 4 holer helps low end torque and an open spacer tends toward the top end.
I have a 4 holer 1" on mine and it does seem to add some low down torque and it for sure decreased top end performance.
I have a 4 holer 1" on mine and it does seem to add some low down torque and it for sure decreased top end performance.
Drifting
Joined: Oct 2000
Posts: 1,825
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From: Shawano WI
Re: Carb spacer question.... (Ryan77)
There is no definative choice for carb spacers. Every cylinder head/maifold/carb/cam combination will like something different. My dyno experience has shown me that if a motor likes a spacer it will show an increase throughout the entire RPM range. If it doesn't like a spacer than it gererally hurts power throughout the entire RPM range. I have never found any spacer that works on every engine. Most engines (but not all) will benifit with a spacer and generally the taller the better.
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Team Owner
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From: Exiled to Richmond, VA - Finally sold my house in Murfreesboro, TN ?? Corner of "Bumf*&k and 'You've got a purdy mouth'."
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St. Jude Donor '06-'10, '13
Re: Carb spacer question.... (78 Vette)
An open spacer over an open intake will give a bit more top end and upper mid range.
A 4 hole spacer over a dual plane intake will give stonger bottem end and mid range torque.
A 4 hole spacer over a dual plane intake will give stonger bottem end and mid range torque.
Thread Starter
Drifting
Joined: Jan 2002
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From: Northampton Ma
Re: Carb spacer question.... (BSeery)
The motor is 383 built by AR Racing with 525hp@6200rpm and Weiand Team G intake, so I think the open spacer would have more of a benefit :cheers:
Race Director
Joined: Nov 2000
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From: Waterloo ontario Canada
Re: Carb spacer question.... (Pete79L82)
I definitely agree with Pete. A carb spacer is used to tune the carb. A small carb on the low rise intake has a problem with too much velocity through the ventura so the mixture hits the bottom of the intake where you get fuel/air seperation. In this case a carb spacer would raise the carb increasing the space before the mixture hits the intake floor, so a spacer would help in this situation.
Take the same intake, install a larger carb and the velocity slows down through the carb, the mixture doesn't hit the intake floor, no seperation and the spacer does no good.
Unless you have a dyno how can you tell if the carb wants a spacer or not??? I have seen spacer actually decrease horsepower on the dyno.
Your butt is not a very good dyno.
Take the same intake, install a larger carb and the velocity slows down through the carb, the mixture doesn't hit the intake floor, no seperation and the spacer does no good.
Unless you have a dyno how can you tell if the carb wants a spacer or not??? I have seen spacer actually decrease horsepower on the dyno.
Your butt is not a very good dyno.
Thread Starter
Drifting
Joined: Jan 2002
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From: Northampton Ma
Re: Carb spacer question.... (norvalwilhelm)
I'm not too worried about it, the car will be dyno tuned and I'll try both with and without the spacer. The intake is the Weiand Team G (part #7530) and I'm running a Speed Demon 750 with mechanical secondaries and no choke :cheers:
