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Think I'm gonna take the EMPI dual carb plunge?
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72VWSB Premium Member
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PostPosted: Fri May 22, 2020 6:01 pm    Post subject: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Planning on changing my setup, single 40 Dellorto to dual carbs on my pretty fresh 1915 engine. Runs pretty good as is but I don't have heater tubes due to my new exhaust setup so dual carbs might be better once it starts getting cool. Thinking of going with the EMPI Dual 40HPMX Dual Carb Kit. Any suggestions or words of wisdom? Plan on taking the old carb off, manifold and spruce up the engine compartment before the install...

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PostPosted: Fri May 22, 2020 7:02 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Single carb to dual carbs makes a big difference. Good luck with it!
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PostPosted: Sat May 23, 2020 4:54 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Those big holes in your rear tin where the heat risers used to be need to be closed up along with that hole on the right side behind the pulley.
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PostPosted: Sat May 23, 2020 5:03 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

oprn wrote:
Those big holes in your rear tin where the heat risers used to be need to be closed up along with that hole on the right side behind the pulley.


X2, I also would get a better oil filler/separator. Dan
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PostPosted: Sat May 23, 2020 5:18 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Well, yes, but the outlet from the filler does go into a second small breather box before it leaves into open air. He´ll be alright.
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PostPosted: Sat May 23, 2020 5:45 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

oprn wrote:
Those big holes in your rear tin where the heat risers used to be need to be closed up along with that hole on the right side behind the pulley.


Right side behind pulley?
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PostPosted: Sat May 23, 2020 6:26 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Do the HPMX clear factory doghouse shroud? I have empi dual 34's on my Thing and they are pretty dang tight with an oem shroud.
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PostPosted: Sat May 23, 2020 6:32 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

72VWSB wrote:
oprn wrote:
Those big holes in your rear tin where the heat risers used to be need to be closed up along with that hole on the right side behind the pulley.


Right side behind pulley?

Yup. That is the dipstick? Not? It will be leaking road dust and hot air around that too just like the other holes.

You also have several small holes in the fan shroud that will be leaking cooling air. Not a big deal but every little bit makes some difference.
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PostPosted: Sat May 23, 2020 7:52 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Thank you for the "cover up the holes" replies! lol Yes, I have been negligent taking care of those! But, perhaps I could get some replies from those who have jumped off the single carb wagon and installed dual EMPI's?
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PostPosted: Sat May 23, 2020 9:25 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Have you ever installed dual carburetors of any type onto a Beetle engine?

From what I've read on theSamba, some HPMX kits have manifolds that bring each carb too close to a full-width fan shroud, so that the narrower 36 hp style is needed. There may be a "deluxe" HPMX kit with different manifolds which do enable the carbs to fit close to the factory shroud.

-You'll probably need to move your oil breather box more to the center of the firewall to clear the right carb's air filter.
-Your alternator clamp is not correctly positioned and will likely interfere with a high-mount crossbar-style linkage. Just loosen the clamp and rotate it CW so that the fasteners are at the 3:00 position.
-Use thick fiber gaskets between the head and the manifold, not stock-style layered metal. Such gaskets should come with the carb kit. Good to have a few extra pairs in case they peel apart when you take the manifold off in the future.
-Take each carb apart one at a time, and blow through all passages (remove jets).
-Usual process to mount a carb is to install the carb onto its manifold outside of the car. Place the carb/manifold assembly down onto the manifold studs on the head, and wiggle while pushing the assembly down so the manifold sits fully against the gasket and head. Getting the lockwasher and fastening nut onto each of the two studs is done mostly be feel for the front ones, so put only one washer down onto the manifold, bring your hand up and then put the nut on.
-To fasten the front nut on the manifold base, I use a swivel-head socket, and about 3 extensions to get the ratchet up to the height of the top of the fan shroud.
-You get a slight bit more access room to get those attachment nuts down onto the manifold bases with your hand if you keep your air filter bases off.
-Have a telescoping magnet pick-up tool handy in case one of those fasteners misses the studs and falls down somewhere on the engine. I've had them fall into the spark plug area through the cylinder cover tin spark plug holes; only way to get them out is with a pickup tool.
-Before you even put either carb/manifold assembly onto either head, run a M8 x 1.25 die over the 4 attachment studs on the heads so that your fastening nuts spin freely.
-You'll need block-off plates for the muffler's two preheat outlet flanges, since you're not using it compared to the current intake manifold.
-Put your red spark plug cables into the 3 stock wire holders that fit onto the fan shroud face.
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PostPosted: Sat May 23, 2020 10:27 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

No, I have never installed dual carbs on a beetle engine before...thanks for all the valuable information here...I may want to pull the engine first and change shroud I would think?
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PostPosted: Sat May 23, 2020 12:12 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

The other option may be to buy a second DRLA or a matched pair of DRLAs then you have the advantage of buying the manifolds the best fit YOUR car/configuration and the linkage YOU want.
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PostPosted: Sat May 23, 2020 1:44 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

That would be my vote to get another dellorto and get another dellorto and dellorto manifold and linkage and you won't have a clearance problem on the fan shroud.
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PostPosted: Sat May 23, 2020 2:01 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

That would mean two manifolds and another dellorto...why isn't there a clearance factor with the delortos?
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PostPosted: Sat May 23, 2020 2:52 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

CB's sedan manifolds should work.

I think I heard empi's delux kit where they copied CB's manifolds, but I don't know. I always buy CB manifolds.
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PostPosted: Sat May 23, 2020 4:15 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Hmm, this one seems to fit a standard shroud...at Jbugs, for my larger engine too
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PostPosted: Sat May 23, 2020 6:30 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

IF you get second Del you will have to rejet the one you have as it is now it will be two rich with each barrel feeding single cylinder...

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Last edited by Dale M. on Sun May 24, 2020 6:19 am; edited 1 time in total
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PostPosted: Sat May 23, 2020 9:56 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Rolling Eyes Rolling Eyes Rolling Eyes Rolling Eyes Rolling Eyes Rolling Eyes

The HPMX carbs are great. I've only had one issue with an early set years ago. Their basic manifolds won't clear a stock doghouse shroud. The linkage leaves a lot to be desired. The rod ends are cheap and loose and the crossbar is pretty flimsy. I tossed at the hardware, redrilled the holes in the arms and used quality 1/4" hardware.

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PostPosted: Sat May 23, 2020 11:38 pm    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

Follow the great advice to clean them well. You will find shavings and other crap in them. Also look up how to measure and set the float level. Mine were not correct.

Another thing that will save you some trouble is getting jet doctors which are essentially snorkles for the idle jets. I heard that some new kits might come with them. If not get a set from CB. Clogged idle jets is a common issue.

Others mentioned the linkage. It is not great on the base kit.. Berg linkage is what I use but CSP is nice as well as the CB hex kit with their air filters.

When they are tuned right, they are great, but there is a learning curve. Good luck.

Oh, almost forgot. Read the dual carb tuning guide John has on Aircooled.net. it is very helpful.

https://www.aircooled.net/synchronize-dual-vw-carburetors-103/
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PostPosted: Sun May 24, 2020 6:23 am    Post subject: Re: Think I'm gonna take the EMPI dual carb plunge? Reply with quote

And there is this sticky...

https://www.thesamba.com/vw/forum/viewtopic.php?t=572107

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