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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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 Posted: Mon Apr 19, 2021 12:16 pm Post subject: Empi venturis |
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| Looking for some info on the 51 Empi carbs. Want to downsize the venturis from 48 to 44, are the Weber venturis the same and fit in my Empis? The Weber venturis from CB Performance look to be much higher quality than the Empi ones I saw on other web sites. Any help would be appreciated! |
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neil68
Samba Member
Joined: March 17, 2007
Posts: 3440
Location: Calgary, Canada
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| Posted: Mon Apr 19, 2021 7:07 pm Post subject: Re: Empi venturis |
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I have Weber 48 IDAs and EMPI 51 EPCs and the parts are interchangeable.
_________________
Neil.
Der Kleiner Rennwagens
68 Beetle 2332 cc, 204 WHP
12.5 seconds @ 107 mph
Dynojet Test: https://www.youtube.com/watch?v=M9B_H3eklAo |
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King_vw61
Samba Member
Joined: February 03, 2018
Posts: 1383
Location: Southern California
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| Posted: Mon Apr 19, 2021 8:48 pm Post subject: Re: Empi venturis |
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I have a set of 42/46 berg vents, I will sell them for a deal if you want them..
I used them once on the dyno then went to straight 46's
These are suppose to be great for street use, they are the ones with the grooves.
PM me if you are interested. what ever berg sells them for I will take off 40%
_________________
1961 Ragtop, Autocraft 2783cc for street/strip 10k miles and counting...230.84 HP to the wheels thru Muffler 13.4 to 1 on E85
https://www.instagram.com/king_vw61/?hl=en |
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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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| Posted: Tue Apr 20, 2021 10:08 am Post subject: Re: Empi venturis |
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| Thanks for all the replies, discussing this with my engine builder, we may try the Berg venturis if they’ll fit, waiting for a call back from Berg. |
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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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| Posted: Tue Apr 20, 2021 3:37 pm Post subject: Re: Empi venturis |
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| Ivkings4, did the venturis not give good results on your dyno test? I have a 2332, 10.5 compression, cb ultra wedge ports, .585 lift, 1 3/4 a1 sidewinder exhaust. Wasn’t dynoed but estimate approx 235 to 240 hp. |
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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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| Posted: Fri May 14, 2021 11:08 am Post subject: Re: Empi venturis |
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| Ok guys, I have the new venturis and the top of the carbs off, can someone tell me how to get that air horn or aux Venturi out so I can get to the venturis? Thanks for the help. |
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k@rlos
Samba Member
Joined: October 04, 2012
Posts: 485
Location: Suffolk, England
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| Posted: Fri May 14, 2021 12:30 pm Post subject: Re: Empi venturis |
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| rock25rock wrote: |
| Ivkings4, did the venturis not give good results on your dyno test? I have a 2332, 10.5 compression, cb ultra wedge ports, .585 lift, 1 3/4 a1 sidewinder exhaust. Wasn’t dynoed but estimate approx 235 to 240 hp. |
Think he told me once they just weren’t big enough for his engine. I went from normal 37’s to 35/40 berg in the 48’s in my bay bus and they made a massive difference, pulls a lot stronger in the low & mid range and top end power is up a a bit too.
As with all things depends on the application I guess |
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67rustavenger 
Samba Member
Joined: February 24, 2015
Posts: 9772
Location: Oregon
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| Posted: Fri May 14, 2021 12:33 pm Post subject: Re: Empi venturis |
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They should pull straight up and out. You have to remove the pump jets first.
Also, Did you check geersengineering.com Shawn makes venturies. I just got a set from ACN.
| Quote: |
| Ok guys, I have the new venturis and the top of the carbs off, can someone tell me how to get that air horn or aux Venturi out so I can get to the venturis? Thanks for the help. |
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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| Posted: Fri May 14, 2021 1:14 pm Post subject: Re: Empi venturis |
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| What are the pump jets and I went with the Berg 40/44 grooved venturis, but the damn aux Venturi or whatever the hell it is won’t come out with any reasonable amount of force. |
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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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| Posted: Fri May 14, 2021 1:21 pm Post subject: Re: Empi venturis |
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| Ok, the pump jets are out, they just pull out. |
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 9772
Location: Oregon
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| Posted: Fri May 14, 2021 3:19 pm Post subject: Re: Empi venturis |
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| rock25rock wrote: |
| Ok, the pump jets are out, they just pull out. |
Just grab the aux ventury and pull it straight up and out of the carb throat.
The venturies you're trying to replace will just slide out.
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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King_vw61
Samba Member
Joined: February 03, 2018
Posts: 1383
Location: Southern California
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| Posted: Fri May 14, 2021 10:13 pm Post subject: Re: Empi venturis |
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| rock25rock wrote: |
| Ivkings4, did the venturis not give good results on your dyno test? I have a 2332, 10.5 compression, cb ultra wedge ports, .585 lift, 1 3/4 a1 sidewinder exhaust. Wasn’t dynoed but estimate approx 235 to 240 hp. |
They were ok, I did just need bigger ones, K@rlos was right. I run straight 46's now. I will go bigger once I have 54 intake valves. Won't need the berg ones
They do what they advertise, stronger signal at lower rpm's.
_________________
1961 Ragtop, Autocraft 2783cc for street/strip 10k miles and counting...230.84 HP to the wheels thru Muffler 13.4 to 1 on E85
https://www.instagram.com/king_vw61/?hl=en |
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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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| Posted: Sat May 15, 2021 9:03 am Post subject: Re: Empi venturis |
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| Thanks for everybody’s help, turns out the aux venturis were twisted on the one carb, once I straightened them out they popped right out. The other one was good and took about 10 minutes to change. I’m wondering if that was part of my low end issues with those aux Venturi holes not being exactly lined up. Gotta change the rest of the jets and we’ll see! |
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 9772
Location: Oregon
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| Posted: Sat May 15, 2021 10:25 am Post subject: Re: Empi venturis |
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That makes sense. If the aux vent is not aligned with the inlet. How can it get fuel?
I haven't run mine yet. Waiting on parts sux!
From what I understand. The venturies should be 2mm smaller inside diameter that the intake valve diameter.
What size intake valves are you running?
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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| Posted: Sat May 15, 2021 5:01 pm Post subject: Re: Empi venturis |
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| I have the CB ultra wedge ports 44 x 37.5 valves, damn things were expensive, lol, Jaycee shorty manifolds with the Empi 51’s and Jaycee polished stacks and foam filters. Don’t remember what the cam is but has 585 lift. |
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 9772
Location: Oregon
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| Posted: Sun May 16, 2021 6:54 am Post subject: Re: Empi venturis |
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| rock25rock wrote: |
| I have the CB ultra wedge ports 44 x 37.5 valves, damn things were expensive, lol, Jaycee shorty manifolds with the Empi 51’s and Jaycee polished stacks and foam filters. Don’t remember what the cam is but has 585 lift. |
Well based on the above description. 42mm venturies would be a good selection.
I don't know how the 42/46 vents work. So I'm no help with them.
On a side note. Have you installed the carbs and manifolds on your engine yet?
I too am using the JayCee shorty intake manifolds. I found that the manifold to head nuts cannot be tightened, without modifying the manifolds for some clearance. The head studs are quite a precise fit. Meaning it's difficult to get the manifolds on and off the engine.
Also, The carbs come into contact with the doghouse FS. The fuel inlets contact the FS. How, if you have them installed. Did you tackle this issue?
I ordered a Scat 36hp doghouse FS yesterday. Due to the above interference.
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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rock25rock
Samba Member
Joined: November 02, 2014
Posts: 20
Location: livonia, MI
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| Posted: Sun May 16, 2021 9:14 am Post subject: Re: Empi venturis |
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| Yep, same issue, my engine builder is a machinist by trade so he machined the manifolds in order to get a wrench on the nuts, the carbs and manifolds had to come off to get the engine in the car so putting them back on was a task even with Webber windows installed, had to modify a wrench to get that job done. I run an external oil cooler with a 36 horse shroud. Stuffing a 2332 in a 57 is a challenge so we went with 5.4 rods to keep it as narrow as possible and when the metal work was being done I had that shop put in late model engine shelf’s which are a bit narrower as well. |
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67rustavenger
Samba Member
Joined: February 24, 2015
Posts: 9772
Location: Oregon
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| Posted: Sun May 16, 2021 9:34 am Post subject: Re: Empi venturis |
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Thanks for the answers.
I don't have a mech or machinist here that can modify my bits  So I'm forced to do mods in my garage with simple tools on hand.
I also found that the #2 spark plug is inaccessible with the manifold in place. I suspect #3 will be the same deal. And this is with the engine on the stand.
All good fun, getting things mocked up and fit.
_________________
I have learned over the years.
Cheap parts are gonna disappoint you.
Buy Once, Cry Once!
There's never enough time to do it right the first time. But there's always enough time to do it thrice.
GFY's Xevin and VW_Jimbo! |
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