Anyone try the Edelbrock VRS-4250 Carb yet?

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harrisonm

harrisonm

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I was watching a Graveyard, Cars episode today, and they put an Edelbrock VRS-4150 carburetor on an engine. It is a Holley look alike carb. I
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thought it was a nice looking carburetor, and I have had a couple of Edelbrock carburetors on my 340 over the years that worked very well. I just wondered if anybody has tried one yet?
 
We had an engine on the dyno at Vrbancic Bros in Ontario Ca a couple weeks ago. Right next door is The Carb Shop and he had a bunch of edlebrock vrs-4150s in all states of disassembly in his shop. I got to “crawl all over” a few of them and I gotta say I like just about everything about them so far. I’d like to run one.
 
They look really nice and their description sounds nice, but I think a lot of people are going to go down the black hole of tuning and never get them right. They have SO MANY adjustments, it's gonna be tough for some.
 
RustyRatRod said:
They look really nice and their description sounds nice, but I think a lot of people are going to go down the black hole of tuning and never get them right. They have SO MANY adjustments, it's gonna be tough for some.
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I said that exact same thing, some people will definitely tune themselves in to a corner on those things.
 
Unity motorsports on YouTube has 3-4 videos on that carb including one of a tour of Edelbrock where they are made.

Keep in mind that carb is race bred, it has no choke and more than likely will be sensitive to weather and elevation changes.
While it may run like a striped assed ape and probably does, it may not be a real good choice for a street car.
 
ValiantRacing said:
A QFT 850 is is over $1100, all carbs are expensive anymore
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Agree. The new stuff seems to be over bled so you'd need to see what calibration Edelbrock put in their carbs.

Far easier to find an early list Holley for cheap and get it rebuilt by a reputable carb builder. At least the early Holley's were make correctly and have the correctly sized internal passages and calibrations to suit.
 
Big.J.007 said:
1k for a holley knockoff with a few extras is insane!!
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Looks to be a taller carb so the air travelling down the bore will most likely increase shear force (better) as opposed to the Holley chokeless main body design.
 
Quick Fuel/Holley are tried and true.. Edelbrock has a name for itself, but not in the 4150 series world. It's like comparing summits house carb to a holley it's a close lookalike without the aftermarket support, it's not something everyone has, or you'd find on the shelf when broke down.




ValiantRacing said:
A QFT 850 is is over $1100, all carbs are expensive anymore
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I think there is a lot of bias towards them because they are not a Holley. All the adjustability without manually modifying it. Big fuel bowls , multiple circuits etc…. I can’t believe I haven’t found a tuning video on them for street cars. I would think they would be great for big cam engines.
 
Allegedly lots of development time and effort into that carb. Only time will tell how good or bad it is, it hasn't been out for that long (<3 years?). Iirc Holley made it known that their long-term business goals are with EFI systems and are kind of giving up on carbs; Edelbrock figured this out and decided to make a "be-all-end-all" performance carb to grab more of the market that Holley's giving up on.

If someone wants to give me $900 I'll buy one and try it on the 360 in my Duster, 750 CFM version should be just right thank you very much... Lmao
 
Big.J.007 said:
Quick Fuel/Holley are tried and true.. Edelbrock has a name for itself, but not in the 4150 series world. It's like comparing summits house carb to a holley it's a close lookalike without the aftermarket support, it's not something everyone has, or you'd find on the shelf when broke down.
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Summit carb is its own animal entirely, kinda resembles a Holley but it's not a copy like QFT etc. The main body and bowls are a single unit with a top plate that comes off for disassembly and tuning. Engine Masters (RIP :() tested one against a few other "new" street carbs and it worked well. Better than the Street Demon like I have on my car, bummer.
 
The summit carb is a copy of a FoMoCo carburetor that Holley manufactured for ford.

Edited to add;
I may be wrong. It looks like the autolite 4 barrels were not manufactured by Holley. I’ll have to dig in to this a bit. I actually own one on a 64 galaxie I should know.
 
I am considering one of these for my 58 Chevy truck, mainly because I swapped in a 4l80e transmission which requires a throttle position sensor. The Edelbrock vrs has a provision to install one in the main body, instead of some aftermarket adapted situation.
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TT5.9mag said:
The summit carb is a copy of a FoMoCo carburetor that Holley manufactured for ford.

Edited to add;
I may be wrong. It looks like the autolite 4 barrels were not manufactured by Holley. I’ll have to dig in to this a bit. I actually own one on a 64 galaxie I should know.
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It is a knock off of a Holley 4100 series. They were common in marine applications.
 
Jeremiah (jd) said:
It is a knock off of a Holley 4100 series. They were common in marine applications.
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There are many excellent Holley knock offs . Why do so many people disparage this one ?
Has there been issues with them ? I really like the features they added . If I needed a new carb the VRS would be my choice .
 
These edie "holleys" are bad ***, but year definitely made for the person who understands all the knobs. But damn, if you do, it's a one stop shop with everything engineered to work together.

Obviously there are those privy to the deep dark arts who will look at this thing and say "Phht, I can do all that with a drill bit and some chewing gum" but if an out of the box solution exists to delve deep, then that's fricking awesome.
 
mbaird said:
There are many excellent Holley knock offs . Why do so many people disparage this one ?
Has there been issues with them ? I really like the features they added . If I needed a new carb the VRS would be my choice .
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I was speaking of the Summit brand carb.

I do have some experience with 4500 series Holley 3 circuit carb on a car that uses a transmission brake. It works as expected.

No bad feelings towards the VRS on my end.
 
I went for two VRS-4150 750 cfm carbs on my STR-12 build. I have not yet put fuel to it. Bagged on the shelf.

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I don't know what I don't know regarding carbs. There have been comments that this carb might not be best for a street application because of tune difficulty and stability and I'm wondering what feature unique to the VRS (or other carb) would cause this? I can understand having more dials to twiddle causing you to get lost in the tune, but once optimized the engine combo, what would cause this one to fall out of tune while an older Holley wouldn't? It's not like the bleed orifices or jets change diameter over time. Is there a feature or circuit added that makes it susceptible to atmospheric changes?
 
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