advice needed on L24 / 45DCOE starting point

[Kent]

Hi Guys,

 

I was hoping that someone here would be able to give me some advice on some starting settings on a set of triple Webers.

 

The Car is a standard (as much as i know) 1970 L24, it was rebuilt by the 2nd last previous owner, but details are scarce, so i can only assume it was not modified. It currently has twin roundtop Su's but is running way to rich i swear, my clothes usually have more petrol in the car than the tank does).

 

I have a set of 45DCOE152 webers on a lynx manifold that use to be on a friends standard L28. They were tuned (badly might i add) a couple of years ago, but either the top or low end was never right.. I would love to stick them on the 240z. I know that 45DCOE are to big.. but it seems easier to put in larger chokes than it would selling them and getting 40's or smaller (eventually i may look at slightly working this engine.. but that is a long while off).

 

The current setup is:

Venturi (Choke) = 36

Aux Venturi = 45 (i presume this is 4.5.. 3 of them also have a 1 on the front, and the other three seem to have a 1c on the front it is very hard to make out.. no idea why they are different)

Idle Jet = 60F6 (6/60, 60/6.. got them all mixed in.. i presume they are the same)

Air correction = 180

Emulsion tube = F15

Main Jet = 145

Pump Jet = 35

 

from what i can gather a set of 30's or 32 chokes will be better for me, can anyone recommend a setup that i can buy, fit in and at least get the car driving (i know that the "perfect" setup will never be found over the internet )

 

Thanks Guys

 

 

 

 

[Kent]

almost forgot..

 

can anyone recommend any decent mechanics / tuners in Sydney (northern beaches, north shore or inner Sydney) who know Z's and weber's inside out?

[chris240]

no no no no no...

you dont put 30 or 32mm chokes on 45 dcoes. 45's are not designed to flow 30-32mm main chokes.

either sell the 45 dcoes or go find a "mildly" worked L28, or get some 40dcoes 32-34mm chokes and jet to a 125 main jet.. the balance of your recipe appears ok. ....its as simple as that.

 

fyi...Im running 40dcoes with 32 chokes (could be 34...) with a mild jet recipe on an L28 and theve been perfect right thru the rev range...

[Kent]

Thanks,

 

unfortunately for now.. an engine swap is out of the question (early matching number car, and i don't have the room to store the engine for later), and both the car and webers have sentimental value. So i am reluctant to sell them up for a set of 40's.

 

I am still very new to carb's, but wouldn't a set of 32-34mm chokes in a 45DCOE not be similar to a set of 32-34mm chokes in a 40DCOE (i presumed that is why they made them in the more restricted 28-34 sizes)

 

Thanks

Kent

[salty]

chokes arent interchangeable between 45 an 40 dcoes :'(

[Kent]

No, but it looks like they make chokes for the 45dcoe in sizes 28, 30, 32, 34 etc.

[FLEXZED]

chokes arent interchangeable between 45 an 40 dcoes :'(

 

welcome back mate its been a while since your last post you so informative

 

 

 

[salty]

welcome back mate its been a while since your last post you so informative

 

 

 

mum passed away easter, long battle with cancer,

cheers

[Scoota G]

I run 45MM Dellortos with 34MM Chokes.

 

Sorry to hear about that Salty 

[Kent]

I run 45MM Dellortos with 34MM Chokes.

 

Is that on an L24?

[Scoota G]

Oops sorry mate, it's on an L26 bored out 40 thou.

[salty]

Sorry to hear about that Salty 

thanks Scoot.

 

 

 

Kent some info coming shortly which may help

[salty]

Kent, some info for you.

the 36 chokes are ok, would work much better with a 72,74 degree cam but suggest that you run a 3.5 aux ventury as the 36 is large.

32's will be more drivable but theres no need to buy them.

the idle jet is way to rich, you should run a 50-55F2 or F13, thats mid range.

I'd also increase the air jet, instead of spend ing $$ on jets , buy a 2mm drill and drill out the 180, that will give you a 200 air.

pump jet should be a 40-45

F15 emulsion tube is ok.

depending on your $$$$ I would recommend buying a Warniford manifold, if you can find one or a Redline, the Lynx  is small and restrictive BUT very streetable but not that good for track work.

I have run 36 chokes on a 240

good luck with it

[peter mc]

hi i just tuned a 240 with 45s motor was stock  34 choke 5.0 sec venturi 1,45 main f15 emmulsion tube 180 air  55f2 idle  and it was ok no power house but it was ok have used this as a start tune for a long time 

 

sorry to hear that salty.

[Kent]

Thanks Guys for the info (and Sorry too for salty, i lost my best friend to stomach cancer 2 months ago, he left me this car and the webers, hence why i am keen to get them going)

 

For the time being, i am just after a nice streetable car.. it is a weekend car.. but would love to be able to drive it to work more often (across the city).. the car needs a little work on it, but long term goal - realistically 2+ years (after i finish my 240K) is to upgrade the L24 a bit, bigger cam.. head work.. nothing wild just something to liven it up a little more.. not interested in breaking the original numbers, which limits me somewhat (otherwise i would be RB'ing it).. i have been waiting for these webers to roar into life for some time.. they were always a work in progress for my mate.. however much i pushed

 

I would rather spend the extra to get the car working well now and for the next 2 years though than compromising the next 2 years until the cam/headwork goes in. I don't really understand the relationship between the choke and aux venturi to judge between your two starting points.

 

Would i be better off going down to 32's (with whatever changes that makes in the jets and auxilary venturi) now, then back up to the 36's when (if) the head/cam goes in? along with the set of larger manifolds.  If this will make the engine happier now, i am keen to do it. If so, what aux venturi should i get (would the current 4.5 work?) and do the 200 air, 40-45 pump jet, 50-55F2 idles remain the same?

 

[chris240]

as peter said...start with 34's....you wont need to go bigger.

I'd personally start with a smaller main jet than a 145 or buy 2 types , there not that expensive. call the guys a weber-performance, theyre excellent to deal with..

[peter mc]

fair call on the mains it is a juggle on some motors with air correction and mains, some times you can go up and down on both. but this is where i like to start

[zr240]

HI

 

This is the recommended starting point from Redline

 

Choke 34

sec Venturi 5.0

Main Jet 1.45

Emulsion Tube F15

Air Jet 1.80

Idle Jet 55F2

Pump Jet 0.45

In. Valve with Exh. Orifice 0.45

 

As I said its the recommended starting point by Redline using a stock L24

 

**just noticed this is the same as what Peter said **

 

Good luck

 

Ash