accufab plenum and ?spacer?

stonegod85 · Aug 27, 2005

will a spacer help out at all with the accufab plenum. i have an opportunity to get a 5/8 spacer (i think that is the size) for $10. would it make any better flow?

Dark Knight GT · Aug 27, 2005

If you can get one for 10 dollars, then I'de buy one and try it out. Especially if you're installing the plenum and spacer yourself(I take it you are). You can always take it off and compare how the car runs with and without it.

Quick note, the way a plenum spacer works is to increase the length of your runners and add more internal space to the intake system, allowing for a bit more air to be present in the intake at one point in time. They really aren't known for making serious power, but they do tend to help out in higher rpms. I'm running two intake spacers that measure almost a full inch with my setup and I don't have any problems with mine. I believe Starkie once did a dyno test with an intake spacer before he switched to a Bullit Intake setup, and he found it increased hp as much as 7-8rwhp in high rpms, like between 5500-6000rpms.

stangman · Aug 28, 2005

most people have some idle problems when they do this. & just a lil fyi, the plenum has a built in spacer

billfisher · Aug 28, 2005

yes...

assuming your runners on your intake have the volume and taper to support it, adding spacers helps shift max rpm torque(hp) to a higher rpm. there is a rusulting drop in low rpm torque as well. i intend to add a cowl hood or scoop to put a 2" spacer on mine. drag racing uses high enough rpm band to benefit. the plenum acts like a capacitor for the runners. the more they can draw from the more they draw. when ford designed the original 4v intake they designed it with less than half displacement volume to retain low rpm torque. remember the wall is the runner length,volume and taper limits. just look at a carb tunnel ram intake. huge plenum volume with large cross section high taper runners. by the way the best torquing horsepower intake available for the street is a weiand street single four barrel tunnel ram. it keeps all low end torque and makes power to 7500+ rpm's.

ForPointSex · Aug 28, 2005

The accufab plenum has the spacer built in.

myponyrocks · Aug 28, 2005

accufabs website doesn't recomend their TB and Plenum WITH a spacer, when a company is telling you not to give them moeny somethings up.

Dark Knight GT · Aug 29, 2005

billfisher said:
assuming your runners on your intake have the volume and taper to support it, adding spacers helps shift max rpm torque(hp) to a higher rpm. there is a rusulting drop in low rpm torque as well. i intend to add a cowl hood or scoop to put a 2" spacer on mine. drag racing uses high enough rpm band to benefit. the plenum acts like a capacitor for the runners. the more they can draw from the more they draw. when ford designed the original 4v intake they designed it with less than half displacement volume to retain low rpm torque. remember the wall is the runner length,volume and taper limits. just look at a carb tunnel ram intake. huge plenum volume with large cross section high taper runners. by the way the best torquing horsepower intake available for the street is a weiand street single four barrel tunnel ram. it keeps all low end torque and makes power to 7500+ rpm's.

I agree with what you said about the intake spacers. What I'm curious about is this "weiand street single four barrel tunnel ram" intake you're talking about. I take it this is not something for the 2v 4.6ltr GT's ?

forpit2000gt · Aug 29, 2005

Not sure about the Weiand intake, haven't seen that yet. Reichard racing makes a 4bbl intake for the 2v and Hogan makes them for the 4v. I am going with one of these setups.

Dark Knight GT · Aug 29, 2005

:offtopic:
Forpit, anyplace I can find out more information on the Reichard racing intake ? I've heard the complete intake with install kit is like 2,000 dollars. Is this true ? Thanks.

hotmustang331 · Aug 29, 2005

Weiand intake manifolds are ONLY for pushrod motors like the Ford 302s and Chevy 350s. Weiands seem to be good intakes but I use edlebrocks Vr Jr intake for my 331. Its powerband is from 3500-8500+. I dont buy the whole idle-7500 thing...maybe on certain setups with the right cam and heads it can make power off idle...but it sure as heck wont pull to 7500....and if the cam and heads are setup for 7500RPM it will NOT make power off idle. The powerband stuff advertised cant be taken literally alot of times and completely depends on your setup...especially the weiand. BTW My heads are setup for 3500-8500...but my cam is setup for 3000-6800. It pulls to the 7500 limiter with ease though.

As far as the spacer, I think Csledd has one with her aftermarket plenum and heck she made 270RWHP W/O cams...so i doubt it will hurt lol.

billfisher · Aug 29, 2005

right

the weiand reference was "for reference only". i goes on small blocks (ford).

to illustrate large primary plenum volume advantage. i have seen those exotic mod intakes and i like them. when i change to 3V i am hoping they have one for it.

forpit2000gt · Aug 29, 2005

Dark Knight GT said:
:offtopic:
Forpit, anyplace I can find out more information on the Reichard racing intake ? I've heard the complete intake with install kit is like 2,000 dollars. Is this true ? Thanks.

reichardracing.com is the website. the intake is all aluminum. They do not show a 4bbl setup but it is offered. I haven't called them but it is the aluminum intake that they use for Fuel injected ingines and instead of a plenum mount on top, there is a 4bbl mount. I'm not sure about price, but I think from some threads a while back that it was around the cost of a Bullit intake swap. That would be $ 1600-1800. If you search a thread with carb intake in the 4.6 forums you can pull up some info on several intakes. I asked about this a couple of weeks ago on this site and modulardepot.com.
vtengines.com is a site you might want to look at.

billfisher · Aug 29, 2005

not true.

hotmustang331 said:
Weiand intake manifolds are ONLY for pushrod motors like the Ford 302s and Chevy 350s. Weiands seem to be good intakes but I use edlebrocks Vr Jr intake for my 331. Its powerband is from 3500-8500+. I dont buy the whole idle-7500 thing...maybe on certain setups with the right cam and heads it can make power off idle...but it sure as heck wont pull to 7500....and if the cam and heads are setup for 7500RPM it will NOT make power off idle. The powerband stuff advertised cant be taken literally alot of times and completely depends on your setup...especially the weiand. BTW My heads are setup for 3500-8500...but my cam is setup for 3000-6800. It pulls to the 7500 limiter with ease though.

As far as the spacer, I think Csledd has one with her aftermarket plenum and heck she made 270RWHP W/O cams...so i doubt it will hurt lol.

if i said "idle" to 7500 i don't remember. but if i did i think it is 3500-7500. I will try to find the dyno pull references that show weiand single 4V tunnel ram is best out of box for low rpm and high rpm performance in pushrod SB.

forpit2000gt · Aug 29, 2005

Weiand is a Holley company. A far as I know they don't make intakes for a modular.
Reichard and Sullivan are the only people making a 2v carb intake that I can find. I don't know about pricing yet.
Hogan makes just the 4v intake.

These are a couple of pics. The Reichard is shown with a plenum for FI but comes in carb form also.

hotmustang331 · Aug 29, 2005

Sorry I miss took your statement of "keeping all lowend torque" which means ALL and that would mean it would have to have a powerband off or near off idle. As far as 3500-7500 then I can believe it. I have seen some impressive dyno graphs for that intake. I just dont buy into it being THAT great...its good but it cant be the best for everything. No inatke can...however it seems to be a good all around one...like the performer from edlebrock. Its in between the vic Jr and performer in power band.

hotmustang331 · Aug 29, 2005

Please dont go carb on a modular...you can make more power with EFI (with FI anyways) and tuning is a sinch.

forpit2000gt · Aug 29, 2005

hotmustang331 said:
Please dont go carb on a modular...you can make more power with EFI (with FI anyways) and tuning is a sinch.

This is application only, that is not a true statement. You can make equal or more power with a carb. It is just different.

billfisher · Aug 29, 2005

reichard looks good

forpit2000gt said:
Not sure about the Weiand intake, haven't seen that yet. Reichard racing makes a 4bbl intake for the 2v and Hogan makes them for the 4v. I am going with one of these setups.

good for you. me too eventually. accufab makes a 90 degree elbow for adapting square bore carb flange to fuel injection. maybe crank fired ignition and 750 or 850 cfm 4 barrel will work. who knows.

billfisher · Aug 29, 2005

maybe, maybe not.

hotmustang331 said:
Please dont go carb on a modular...you can make more power with EFI (with FI anyways) and tuning is a sinch.

performer carbs have annular discharge which make about EFI torque. if you look at cfm ratings for accufab with 75mm @ 29" vacuum it really does not impress me.
however with carbs on my 302 i pulled 1" vacuum @6900 with 750 cfm carb. that was with dual plane 6500 rpm intake. with victor junior and RADICAL cams 850 is realistic. CFM = max HP (usually). Reichard intakes 'appear' to have what it takes to flow 6500+. i just hope they make 3v version. i will be first to jump on 3v at that point. i like EFI now. i like drivability, economy and power. I get 28 mpg now. my last 302 got 8 mpg.

hotmustang331 · Aug 29, 2005

forpit2000gt said:
This is application only, that is not a true statement. You can make equal or more power with a carb. It is just different.

Not equal...you can only go so far with a blowthrough carb setup. ofcourse your right as this only applies to a modular setup. Why? because there are no postitive displacement blowers that use a carb available for the modulars....a draw through carb setup can make serious power. But like said, the fuel injection with a centri can make more power ultimatly make more power than the same centri connected to the carb. Really it comes down to its tuning capabilities, you would never get the tune right with the carb. trying to adjust the airbleeds and different jets...there are only so many combos. My quote is true when taken to the extent..but for the adverage GT it would probably make more. But even still you can throw your gas milage out the window...STAY WITH EFI.

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