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Dellorto DHLA 45M Blow-Thru carbs


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#1 24OZ

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Posted 22 October 2009 - 02:08 PM

I've done a lot of reading here about the old triple carb blow through set ups that people drove around in back in the day.

Seems that the consensus is that however much you tuned them there was drivability issues. However these set ups were usually with Mikunis or Webers.

I wonder if anyone tried the carburettor that Dellorto developed for the Lotus Esprit Turbo, the DHLA 45M, as this is the only true turbo carb.

They had what was called the 'tri-jet' system, which as well as an idle and main circuit, had a power jet circuit for extra enrichment at high revs.

I am hoping someone has used them and could give some insight on how the drivability was.

I originally thought that a DHLA 45 could be converted into a DHLA 45M by using the 45M gasket kit and machining the body to accept the spindle seal retaining washer. However a call to Eurocarb in the UK told me that it just makes them pressure proof- the carb will still not have the power jet feature that the 45M has.


#2 PanzerAce

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Posted 25 October 2009 - 01:13 AM

Never even heard of them. Any chance for a link for me to read up on them?
1973 240Z, 3.0L Rebello, "running them funny sideways triple deuces". Living and breathing again after almost a year in the shop. DEATH BY SUV, 5-16-2012 RIP.
1978 280Z Possible recipient of anything salvageable from the '73

#3 24OZ

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Posted 26 October 2009 - 10:06 PM

Hey there, there isn't much information out there unfortunately. I have a diagram and that's in Italian! If you want a copy shoot me an email.

#4 Tony D

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Posted 27 October 2009 - 03:07 PM

The 'power jet' may be a bit overated.
VW's for years here in the USA used converted Dellortos with the spindle seals and special emulsion tubes that enrichened under boost.

Which may be the 'power valve' they are referring to... I haven't seen a 'power valve' or see where they would even put it in the body.

Send me the diagram of the 45M with the valve, I'd be interested in what it looks like and how it was fitted.

The drivability problems I'm convinced are a byproduct of sh*tty plenum design. My mikuinis were flawless (er... as carbs can be...) with one plenum design. When I made the plenum smaller, drivability problems resulted.

The VW's I worked with using Dells were always very drivable, same as my original Mikuini Build. I even got a set of DHLA's when I found them, so I could replicate my VW experiences on a Z. That never happened, EFI came along, and made it a non-starter (er...excuse the pun!)

sharkie73z AT yahoo DOT com

You will get the HKS photos this evening when I get home from the office, if the lighting holds out!

#5 PanzerAce

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Posted 27 October 2009 - 09:54 PM

I'll take a copy while you're sending one to tony:

panzerace @ gmail.com
1973 240Z, 3.0L Rebello, "running them funny sideways triple deuces". Living and breathing again after almost a year in the shop. DEATH BY SUV, 5-16-2012 RIP.
1978 280Z Possible recipient of anything salvageable from the '73

#6 Tony D

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Posted 28 October 2009 - 11:41 AM

The photos are 16MB, if gmail accepts that much, I can send them from my work e-mail to you ace.
Otherwise I will cut the message in half and send two.
I got to rush to the house to cut up a tree laying on my cars, and hten pack for Louisiana and an emergency job at Marathon Refinery in Garyville.
I'll check in when I get the time and forward as appropriate.

#7 PanzerAce

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Posted 29 October 2009 - 12:23 AM

I'm pretty sure it'll accept anything up to 40MB. I know I've sent some truly massive LD28 diagrams before...
1973 240Z, 3.0L Rebello, "running them funny sideways triple deuces". Living and breathing again after almost a year in the shop. DEATH BY SUV, 5-16-2012 RIP.
1978 280Z Possible recipient of anything salvageable from the '73

#8 Tony D

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Posted 29 October 2009 - 01:25 PM

Panzer, e-mail on the way to you through the ether...

#9 PanzerAce

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Posted 30 October 2009 - 01:52 AM

Panzer, e-mail on the way to you through the ether...

Looks like the ether didn't lose it or get overloaded :D

Thanks for the pictures (and if enough people want them, I'll rehost them (and if it's ok with Tony))
1973 240Z, 3.0L Rebello, "running them funny sideways triple deuces". Living and breathing again after almost a year in the shop. DEATH BY SUV, 5-16-2012 RIP.
1978 280Z Possible recipient of anything salvageable from the '73

#10 Tony D

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Posted 30 October 2009 - 07:45 AM

Post em if you want, saves me the trouble! LOL
Some of them are out of focus...I don't like my new 'mini camera' as much as the previous model I had. Small lenses suck.

#11 24OZ

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Posted 02 November 2009 - 01:11 PM

For reference, these are photos which I received from Euro Carb which illustrate the 45M with the power jet feature. I also attach the 45M exploded diagram.

Attached Files



#12 PanzerAce

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Posted 10 November 2009 - 02:50 PM

Finally got around to ULing those photos. I just went ahead and zipped everything into one file, since it's easier on space.

HKS plenum pictures: http://www.mediafire.com/?zbjyywzhikl

If anyone wants it, I also have the service manual for Mikuni PHH carbs in .pdf format.
1973 240Z, 3.0L Rebello, "running them funny sideways triple deuces". Living and breathing again after almost a year in the shop. DEATH BY SUV, 5-16-2012 RIP.
1978 280Z Possible recipient of anything salvageable from the '73




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