Leyland Car Owners - Holley carby with 4.4 ltr engine

Question Holley carbys

Sunday, November 06, 2005

: Right oh , i just found the problem (I think).
: I had a go at retuning the holley 600 carb and found that when i turned idle screws back in and only turned them out half a turn the motor started to run smoother and now theres no smoke out the pipes.
: Now the question is i thought that these carbs had a one and a half turn idle ajustment?? could there be another prob?(leak?)

: cheers niko.

: Monday, November 07, 2005 5:06 PM

: Hi Niko
: One question, why are you running such a high CFM Carby when their is no way in the world that your 4.4
: can flow that much ???
: If you want it to boogie down low and up high,don't go larger than a 465 Holley.
: So many people think bigger is better and end up driving a fuel guzzling pig instead of a torquey street sleeper.
: I have the figures here to work out your CFM requirements if you provide me with some details about your motor..
: Cheers Anton...

Monday, November 07, 2005 8:44 PM

: Hi Anton, i think from memory i had been told that the 600 would work fine, but im not sure by who its been in the car for a while.
: When i had the motor recoed they (speedpro) did do a fair bit to it.
: It was bored out to 4.8ltrs and flattop pistons were fitted.
: The heads have been ported/shaved and the manifold is a custom number (4barrel)
: Other mods include
: jethot coated extractors, electronic distributor,and a cranecams sparkamplifier.

: Im not sure of the power out put but the biggest problem has been the transmission its blown up three times( one time really blowing up!!)
: Its all going to change as im going to fuel inject the motor sooner than later.
: cheers niko.

Mon, 7 Nov 2005

: Sounds good in the motor department Nico, but i would still like to see a 465 holley set up properly for the motor
: mods, recon you would think twice about fuel injection then. I would imagine that the 600 holley you have on at
: the moment would be running a heavier spring on the vacuum secondarys to negative any of the ill effects of the
: large carby, opening the secondarys too quick which would play havoc with your airspeed.
: The formula for working out your CFM is----- Engine CID X Maximun RPM Divided by 3456 .......
: This formula assumes 100% Volumetric efficiency, which off course you will only have if your motor is blown. \
: Yours is probably working at around 80 to 85% realistically.

: For example a 350 chev X 8000 rpm Divided by 3456 = 810cfm at 100% VE
: Where at 85% VE its CFM is 689 quite a difference.

: So your motor would roughly come out at 290cu X 5000rpm divided by 3456 = 420cfm at 100% VE........

: Hope this helps & Happy Peeing.................
: cheers Anton.

Tue, 8 Nov 2005
: Your Holly 600 isn’t too big for the capacity (4.4) but the P76 ports in the heads are too restrictive to allow
: the flow rate the 600 needs, hence try using a smaller CFM size and it will probably go better and use less fuel .

: You can enlargen the ports for more flow and fit bigger valves , cam etc and the horsepower will go up but low down toque will suffer , also don’t expect it to be a cheap option .
: By the way – Holly lies about the CFM rate on their carbies (they have a creative way of measuring their CFM rates to get higher figures)

: Hope all this helps , now where was that coma .......

: Rick

Mon, 7 Nov 2005
: With a mild cam, extractors and few head mods a 390cfm would do nicely, I reckon.
: Mick.

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