Is This TOO Much?

[texasz]

I'm looking at a 240Z with an L24 and a Holley 650 on it. Is that carb too big?

[ZmeFly]

but it wouldnt matter as long as you decided to switch back to the dual su's

plain and simple the Z wasnt made for a downdraft carburetor nor for a four barrel

[Mr Camouflage]

4 barrels for 6 cyls, the maths dont add up.

Kidding aside, the is 650 probably too much carb for a 2.4 liter engine, unless it has a wild cam in it, even then it probably still is, but i'm no expert, i've just read a lot of car mags.

L24 engines did come with downdraft carbies. The skyline/240K for example.

[biker]

Sounds too big for me.

In the days of old, a 6 cylinder of an L24 size would not get more than a 2 barrel and no greater than 450cfm.

But I am talking about GMH straight sixes

Can't see things changing

:beard:

[dozer171]

motorsport sells the fourbarrell setup and reccomends 390CFM, seems like it'd be good even for a mod l24

[Mudge]

That is HUGE, but do we know how it is jetted? Alot of people who 4-barrel the L6 run a 390cfm setup.

[texasz]

No, I do not know how it's jetted. I do not think that the owner does either. He has told me that the car starts but sputters/backfires and stalls out. He is blaming the over carberation for this problem. The car also comes with dual DGVs already mounted on intakes with I would be swapping for the Holley that is on the car now. That is of course if I buy it.

[Brett240]

the original SU's will flow fine, even with a wild cam. my engine is 2949cc, has a stage 3 cam and im still running 1 3/4 inch SU's, albeit with richer needles.

[Mudge]

I know the DGV carbs a bit as I have them on my car, I am getting 20-22 MPG average, freeway is 3400-3800 RPM for me I work in San Francisco so I dont touch alot of freeway miles either, overall though I wish I had round tops, but my car is a 73. I have an early 5 speed and I believe a 3.90 (its an R200). With what my RPM and tires are, everything points to a 3.90, 3.54 with the Turbo is going in "soon." Just to give you an idea on what to expect when you rejet the DGVs, I spent about $75 experimenting on jets.

If I had a choice I'd go with round tops, you should be able to score a set around $100, in 73/74 these cars came with less performance oriented SUs. They can be worked over for bigger HP setups, there is a Rebello guy running 287 crank HP on pump gas with big bore SUs.