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Carb spacer

DeltaV said:
There are probably at least a few benefits to a spacer, but mainly academic?

1) isolating the carb from heat.
2) it gives the intake charge a more gradual turn into the runner which helps flow.
3) it increases plenum volume.

I used one a long time ago mainly to address concerns regarding heat.
Click to expand...
Item #1. Heat isolation....depending on what it is made from....the R value or resistance to heat transfer.
Item #2. It creates a larger pressure drop and REDUCTION of flow velocity of the exiting fuel mixture which actually hinders flow due to the expansion factor....Boyle’s Law of pressure volume temperature relationships. Applies to fuel induction systems also.....
As per Boyle’s law, any change in the volume occupied by a gas (at constant quantity and temperature) will result in a change in the pressure exerted by it. In other words, the product of the initial pressure and the initial volume of a gas is equal to the product of its final pressure and final volume (at constant temperature and number of moles). This law can be expressed mathematically as follows:

P1V1 = P2V2

Where,
P1 is the initial pressure exerted by the gas
  • V1 is the initial volume occupied by the gas
  • P2 is the final pressure exerted by the gas
  • V2 is the final volume occupied by the gas
This expression can be obtained from the pressure-volume relationship suggested by Boyle’s law. For a fixed amount of gas kept at a constant temperature, PV = k. Therefore,

P1V1 = k (initial pressure * initial volume)

P2V2 = k (final pressure * final volume)

∴ P1V1 = P2V2

This equation can be used to predict the increase in the pressure exerted by a gas on the walls of its container when the volume of its container is decreased (and its quantity and absolute temperature remain unchanged).

Examples of Boyle’s Law​

When a filled balloon is squeezed, the volume occupied by the air inside the balloon decreases. This is accompanied by an increase in the pressure exerted by the air on the balloon, as a consequence of Boyle’s law. As the balloon is squeezed further, the increasing pressure eventually pops it. An illustration describing the increase in pressure that accompanies a decrease in the volume of a gas is provided below.

#3. See Boyle's Law examples....

Just a thought for you to consider......
BOB RENTON
 
Last edited:
I would have to say after my Algebra lesson , the word SPACER was the wrong word to use in the initial post

That would bee an insulated carb base gasket
 
RJRENTON said:
Item #1. Heat isolation....depending on what it is made from....the R value or resistance to heat transfer.
Item #2. It creates a larger pressure drop and REDUCTION of flow velocity of the exiting fuel mixture which actually hinders flow due to the expansion factor....Boyals Law of pressure volume temperature relationships. Applies to fuel induction systems also.....
As per Boyle’s law, any change in the volume occupied by a gas (at constant quantity and temperature) will result in a change in the pressure exerted by it. In other words, the product of the initial pressure and the initial volume of a gas is equal to the product of its final pressure and final volume (at constant temperature and number of moles). This law can be expressed mathematically as follows:

P1V1 = P2V2

Where,
P1 is the initial pressure exerted by the gas
  • V1 is the initial volume occupied by the gas
  • P2 is the final pressure exerted by the gas
  • V2 is the final volume occupied by the gas
This expression can be obtained from the pressure-volume relationship suggested by Boyle’s law. For a fixed amount of gas kept at a constant temperature, PV = k. Therefore,

P1V1 = k (initial pressure * initial volume)

P2V2 = k (final pressure * final volume)

∴ P1V1 = P2V2

This equation can be used to predict the increase in the pressure exerted by a gas on the walls of its container when the volume of its container is decreased (and its quantity and absolute temperature remain unchanged).

Examples of Boyle’s Law​

When a filled balloon is squeezed, the volume occupied by the air inside the balloon decreases. This is accompanied by an increase in the pressure exerted by the air on the balloon, as a consequence of Boyle’s law. As the balloon is squeezed further, the increasing pressure eventually pops it. An illustration describing the increase in pressure that accompanies a decrease in the volume of a gas is provided below.

#3. See Boyle's Law examples....

Just a thought for you to consider......
BOB RENTON
Click to expand...
Yeah Wayne, I can’t believe you didn’t know that. Shhhheee
 
RJRENTON said:
Item #1. Heat isolation....depending on what it is made from....the R value or resistance to heat transfer.
Item #2. It creates a larger pressure drop and REDUCTION of flow velocity of the exiting fuel mixture which actually hinders flow due to the expansion factor....Boyals Law of pressure volume temperature relationships. Applies to fuel induction systems also.....
As per Boyle’s law, any change in the volume occupied by a gas (at constant quantity and temperature) will result in a change in the pressure exerted by it. In other words, the product of the initial pressure and the initial volume of a gas is equal to the product of its final pressure and final volume (at constant temperature and number of moles). This law can be expressed mathematically as follows:

P1V1 = P2V2

Where,
P1 is the initial pressure exerted by the gas
  • V1 is the initial volume occupied by the gas
  • P2 is the final pressure exerted by the gas
  • V2 is the final volume occupied by the gas
This expression can be obtained from the pressure-volume relationship suggested by Boyle’s law. For a fixed amount of gas kept at a constant temperature, PV = k. Therefore,

P1V1 = k (initial pressure * initial volume)

P2V2 = k (final pressure * final volume)

∴ P1V1 = P2V2

This equation can be used to predict the increase in the pressure exerted by a gas on the walls of its container when the volume of its container is decreased (and its quantity and absolute temperature remain unchanged).

Examples of Boyle’s Law​

When a filled balloon is squeezed, the volume occupied by the air inside the balloon decreases. This is accompanied by an increase in the pressure exerted by the air on the balloon, as a consequence of Boyle’s law. As the balloon is squeezed further, the increasing pressure eventually pops it. An illustration describing the increase in pressure that accompanies a decrease in the volume of a gas is provided below.

#3. See Boyle's Law examples....

Just a thought for you to consider......
BOB RENTON
Click to expand...
Like I said...mainly academic. Most people aren't going to notice any differences or be able to measure any differences.

My BSME and MSME work were in fluid and thermal sciences, as well as aerodynamics. I've been in the aerospace industry for more than 44 years and I'm looking forward to retirement. I did not complete my MSAE work/thesis and do not intend to do so. Also, I have no intention of teaching master's level engineering courses ever again. I did that for one full year around 20 years ago. Maybe 2 out of 20 students were serious about having a deeper understanding of physics and engineering. Maybe.

I'll be in the garage, as well as enjoying the great outdoors much more starting sometime next month.

I'll try to do some moderating too. :)
 
What is the thickness of the carb base gasket you removed? The one you linked above is a 1/2" thick.

Also, did the air cleaner fit in the Ram Charger ductwork correctly?
 
DynaBro said:
Well I torqued everything correctly and it just blew loads of fuel out the base
Click to expand...

Have you put in a carb kit and checked the float levels?
 
DeltaV said:
What is the thickness of the carb base gasket you removed? The one you linked above is a 1/2" thick.

Also, did the air cleaner fit in the Ram Charger ductwork correctly?
Click to expand...
Holley says 108-12 “Base Gasket 1.75 in. Bore Size .3125 in. Thickness Fits Holley 4160/4150 and four barrel TBI flange pattern”

Yes I completely rebuilt the carb with all new Holley parts and set the floats.
 
DynaBro said:
Holley says 108-12 “Base Gasket 1.75 in. Bore Size .3125 in. Thickness Fits Holley 4160/4150 and four barrel TBI flange pattern”

Yes I completely rebuilt the carb with all new Holley parts and set the floats.
Click to expand...
Did you measure the one you removed?
 
DeltaV said:
Like I said...mainly academic. Most people aren't going to notice any differences or be able to measure any differences.

My BSME and MSME work were in fluid and thermal sciences, as well as aerodynamics. I've been in the aerospace industry for more than 44 years and I'm looking forward to retirement. I did not complete my MSAE work/thesis and do not intend to do so. Also, I have no intention of teaching master's level engineering courses ever again. I did that for one full year around 20 years ago. Maybe 2 out of 20 students were serious about having a deeper understanding of physics and engineering. Maybe.

I'll be in the garage, as well as enjoying the great outdoors much more starting sometime next month.

I'll try to do some moderating too. :)
Click to expand...
Too bad you did not complete your MSAE credentials.....sometimes it takes more guts than than the glory...the hours can be difficult.....I had/hold a BS EE, an MS in Buisiness Administration-Macro Economics and a Professional Electrical Engineer credential. I have done ASME Section VIII Division 2 Unfired pressure vessel calcs, of the 3 types of gas-gas, gas to liquid, and liquid to liquid high temp heat exchangers, i held a class 2 ASME inspection credential, to be able to read and sign off "the shooter's sheets" for x-ray inspections. I have done WPS designs AND PQR records for welders' fabricated construction of ASME vessels. I've used exotic metals....Inconel, Incaloy, all the stainless steels both ferritic and non ferritic alloys (400 series of metal...iron and chrome, no nickel) I have 50+ years maintenance and supervision experience at a chemical plant and project management and have had direct responsibility for building several plants both in the US plus UK......it sounds as if we have common goals and experiences......congratulations on your achievements. ........cheers....
BOB RENTON
 
Any idea what side the paper gasket goes? Touching the intake or touching the carb? Only have one.
 
I recall an episode of Engine Masters, where Steve Dulcich, Dave Freiberger and Steve Brule tested spacers where dyno testing showed spacers provide a bit more HP and Torque...can't recall the range(s). Seems to me from a foggy memory that Dulcich opined that spacers increase air velocity a bit.
 
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