How to tune a 2lt

[carlo rossi]

yeh but much cheaper than a new carburettor
Imagine those poor americans
they have to buy a new carby everytime!
they go by CFM very hit miss they have no idea what its doing
some say a 40mm dellorto is equivalent to around 250 cfm( means nothing really)
X 2 means a 2ltr with 500cfm! bigger than a 5.0ltr V8 stock!! so thats 125 cfm each 500cc
now back in the 70s the thing to do to your chev 350 or falcon 5.8 was to big valve the heads flow it and a cam extractors
and then a 750 double pumper Holley sits on top thats 94 cfm for each 720cc piston up from 74cfm
See how well the alfa flows, if the alfa was a 350 cubic inch behemoth it would need 180 cfm for each piston roughly double and this is a basically stock car!! and thats a 1450cfm Holley or what you call a Daytona race car CARB

I have to add thou a little known fact that in 1977 the fastest reasonably priced 2 doors
falcon 5.8 197 km/h  faster than your torana A9x 5.0ltr and  a charger( 4.3 6CYL) at 185kmh and the monaro 308( 5.0 ) at 176kmh
and the Alfetta gtv 194kmh some say it was faster but thats wheels magazine tested

[joestram]

Hi everyone - just an update - I've received my jets, however, can't track down a local rebuild kit.

I know I can buy them online, however, prefer to buy local.

I drove over to thornbury carbs last weekend and they were closed and have been trying to call all weekend and they seem closed as well.

I have tried a few other places from the yellow pages but seems like all those businesses are closed.

Where do others buy carb rebuild kits and gaskets from?

Is carby cleaner able to be shipped by post? I wouldn't have thought so?

Thanks

Joe


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[Alfapride]

YOu can buy carby cleaner from repco or super cheap auto. Kits might be available from some of the club sponsors or try the spare place in Adelaide if you want to buy local

[joestram]

Thanks for the reply Alfa Pride.

I will be calling them today

[Neil Choi]

Give Bruno at Maranello a call, 9386 9650.

[carlo rossi]

what have you got and what are you missing
you wont get the chokes in Australia i believe
dellorto.uk

[carlo rossi]

have to say that auto italia was the perfect run to tune the car
2 jet changes on the way there
on the way back it flew and had a 5th gear drag with a 328 and a 308
level pegged
I think if they went back to 3rd or 4th I would have been a different story
but the moral of the story is a 2lt Nord with 40% more power is not a bad thing

[joestram]

Thanks everyone!

I have just purchased all my outstanding bits from the UK so hopefully they are delivered shortly and I can test it all out!

[carlo rossi]

have the parts arrived?

[carlo rossi]

surely the parts have arrived Joe?
how is it going

[joestram]

Sorry Carlo, I just saw these messages and your pm... the first order of chokes never left the UK so had to wait 30 days before lodging a complaint and then I purchased from a new seller...hopefully they are here in 2 weeks. Everything else has arrived and is ready for installation. Looking forward to bolting it all back together!


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[carlo rossi]

whilst you are waiting take off the front cam cap on the inlet first
(one at atime)so you dont mix them up and check that cams are set to 105 deg
on inlet depending year of manufacture of the cap the degrees could be anywhere from 102 to 114deg
download the deg template from centreline to see what its set at
the exhaust can be at 108-104 the lower the gruntier down low
please note that from front of the engine the inlet for a lower figure goes clockwise (advance)
and the exhaust anticlockwise (retard)

[Mike]

Just finished reading this thread start to finish
...now keen to hear outcome!  We all started learning this way so keep it up. 

One thing I have seen in recent times is chokes with a poor radius on the front.  Presumably some inferior copy.  The fellow spent a few dyno sessions trying to work out why his high performance engine would not rev.  Changed echausts...tune..etc only to find a new set of chokes transformed it.  Closer inspection revealed a slightly shorter taper after initial rad.  Only thing I could think was that this was perhaps producing some flow separation past a certain flow point.

One other note would be that inlet trumpets length also has a material impact on power but you are a way off woring about that.  I note yours are quite short so more akin to top end rather than bottom end.

[joestram]

Hi everyone, I think I'm finally going to have some time this weekend. How do I take the chokes out? I can't figure it out!
All my parts have arrived now so I'm just going to reassemble the carbs with the new parts and hope for the best!!


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[bonno]

Hi Joe
Suggest that a possible youtube link may help in disassembly/assembly of your carburetors. Not much available on the net on the DHLA Dellortos except a "how to" guide, however 2 good Youtube videos on the DCOE webers maybe worth a look in particular part 2 @ 4 minute mark on removal of chokes.
Dellorto  How to guide
https://elthamracing.wordpress.com/how-to-rebuild-dellorto-sidedrafts/ 
Weber
Part 1
https://youtu.be/4dxO1TPWhlE
Part 2
https://youtu.be/9ta3cBkXXIA
Hope this helps
bonno