hi all,
i just put a 465 holley (vac sec) on my 202 and am after any pointers on tunning it, doesn't have to be perfect just good enough to drive down and get it dyno tuned. but still it would be nice to have it running well, and then even better after the dyno tunning (probably next month)
c'mon all you holley users time to step out of the closet and give up some of your wise knowledge.
dont' know about the power valve but jet size is 63. i can get it to idle OK but its running heaps rich, so do i screw the mixture screws in or out?
also has an auto choke, which im not sure is set up correctly. at full throttle the choke flap is closed.
any advise is good.
cheers
john
(formaly known as johno)
465 holley tunning
Started by
_Chamois hatch_
, Apr 15 2006 05:24 PM
11 replies to this topic
#2
_EXLXSL_
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Posted 15 April 2006 - 07:40 PM
Idle
The best way to set the idle mixture is to lean the carb out until the vacuum just starts to drop, then richen the mixture by about 1/4 turn. If you have a bit of a stumble in very light, low speed operation, sometimes it helps to richen it up by another 1/4 turn.
If you are starting your adjustments fresh, begin at about 2 turns out. If you have a carb with a normal system where the mixture leans as you turn the screws in, then when you screw them in almost to a light seating, the engine should die.
On a regular, standard idle circuit Holley, turning the idle mixture screws all the way in should kill the engine. If your idle mixture screws do not respond to adjustments, you may have several different problems. The most common is using the wrong carburetor for the application.
This is some stuff I saved off the web ( Carb tuning ) and will explain a lot more. The method above works if you have, or have access to a vacuum gauge of some sort. I prefer a manual choke and you could convert it but if you set up the auto choke properly it should be fine - Bob2000 above also recommends using genuine Holley parts over cheap stuff. You get what you pay for...
The best way to set the idle mixture is to lean the carb out until the vacuum just starts to drop, then richen the mixture by about 1/4 turn. If you have a bit of a stumble in very light, low speed operation, sometimes it helps to richen it up by another 1/4 turn.
If you are starting your adjustments fresh, begin at about 2 turns out. If you have a carb with a normal system where the mixture leans as you turn the screws in, then when you screw them in almost to a light seating, the engine should die.
On a regular, standard idle circuit Holley, turning the idle mixture screws all the way in should kill the engine. If your idle mixture screws do not respond to adjustments, you may have several different problems. The most common is using the wrong carburetor for the application.
This is some stuff I saved off the web ( Carb tuning ) and will explain a lot more. The method above works if you have, or have access to a vacuum gauge of some sort. I prefer a manual choke and you could convert it but if you set up the auto choke properly it should be fine - Bob2000 above also recommends using genuine Holley parts over cheap stuff. You get what you pay for...
#3
rodomo
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Posted 15 April 2006 - 07:45 PM
Screw them in to lean off. Maybe start from scratch and count how many turns in each till they bottom. Say if one screws in 2 turns and the other 1 1/2 turns, then turn them both out 1 3/4 turns. Start it up and screw one them in (1/4 of a turn at a time) then the other. What ever you turn one is the same amount you turn the other. If it starts to run rough that is where you stop turning in and minutely turn both out till it purrs.
Good luck!
^ Must have been typing together
Good luck!
^ Must have been typing together
Edited by rodomo, 15 April 2006 - 07:47 PM.
#4
_UCV80_
_UCV80_
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Posted 15 April 2006 - 08:12 PM
I just bought a 390cfm 4 barrel for my hot 202.
here is some info to read.
Holley tuning
doesnt exacly tell you how to tune. Interesting read though.
Thanx for the above posts
keep them coming. very interested to see how the auto choke works.
,nathan
here is some info to read.
Holley tuning
doesnt exacly tell you how to tune. Interesting read though.
Thanx for the above posts
keep them coming. very interested to see how the auto choke works.,nathan
#5
rodomo
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Posted 16 April 2006 - 01:18 AM
Hey ToranaZ? Have you fitted it yet? Driven it? Is it vac or mech secondaries?
More than likely a better choice than the 465 but thats just my opinion.
More than likely a better choice than the 465 but thats just my opinion.
#6
_UCV80_
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Posted 16 April 2006 - 09:13 AM
Just won it on ebay... so i wont have it for a week and a bit.
was advertised as mech sec. but there is a vac sec diaphram in the pic.
did some internet calculator thing and it suggested a 388cfm carby.
Any idea wat jets i should use... might just start with the stock ones and work my way up.
cheers,
nathan
was advertised as mech sec. but there is a vac sec diaphram in the pic.
did some internet calculator thing and it suggested a 388cfm carby.
Any idea wat jets i should use... might just start with the stock ones and work my way up.
cheers,
nathan
#7
_Chamois hatch_
_Chamois hatch_
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Posted 16 April 2006 - 10:29 AM
thanks for the info gents i'll give it a go today...
i went for the 465 coz iv seen it work excelent on a hot 179 in an eh wagon my mate had. plus i pick up the carby BRAND NEW for $200 still in original Holley box, so i cant complain.
cheers and keep the info coming
john
i went for the 465 coz iv seen it work excelent on a hot 179 in an eh wagon my mate had. plus i pick up the carby BRAND NEW for $200 still in original Holley box, so i cant complain.
cheers and keep the info coming
john
#8
rodomo
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Posted 16 April 2006 - 11:09 AM
I had my 390 dyno'ed and they did change the jets but it was 25yrs ago and I don't remember the sizes sorry. The reason I would choose a 390 over a 465 is as you have said the CFM. Is a 465 square bore? Vac secondaries? Waht did you pay for the 390 off e-bay? I looked at that myself and saw it was Vac secondaries. I didn't bid cos I thought if the seller doesn't know if its vac or mech secondaries, does he know for sure its 390?
Edited by rodomo, 16 April 2006 - 11:13 AM.
#9
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Posted 16 April 2006 - 12:09 PM
hey,
They said it is a 400-450 but the part number says 390
Its a lady seller, she had it all on a standard 179 with no mods lol poor little engine woulda got drowned! im guessing/hoping thats why it was for sale.
Ebay link
$185 + post for it all... all my bids on the triples got out bidded, so i grabed this, before i got my engine is had a 390 and he couldnt stop spinning his wheels.
Nice buy john! 465 will go good, im guessing the 202 is pretty worked. everyone running triples have around 500cfm!
Do you get less performance with the vac sec?
,nathan
They said it is a 400-450 but the part number says 390
Its a lady seller, she had it all on a standard 179 with no mods lol poor little engine woulda got drowned! im guessing/hoping thats why it was for sale.
Ebay link
$185 + post for it all... all my bids on the triples got out bidded, so i grabed this, before i got my engine is had a 390 and he couldnt stop spinning his wheels.
Nice buy john! 465 will go good, im guessing the 202 is pretty worked. everyone running triples have around 500cfm!
Do you get less performance with the vac sec?
,nathan
#10
_Aquarius - LC_
_Aquarius - LC_
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Posted 16 April 2006 - 01:38 PM
G'day chamois hatch,
Prior to the tripples i have on now, I was running a 465 on my
worked 202 for nearly 2 years. Before this 350 then 500 cfm
then 390 holleys. I've also tried the 34 adm webber & twin
stromy's, on the same engine.
I dont no anything about your 202 , but as long as its worked
enough to handle the extra carburation, the 465 is a good choice.
Certainly the best of the single carb combo's I have used on my
engine. I should say.. dyno runs were done with all the above
combo's. So no guess work !
As far as set up advise, in the 465 i had 59 primary jets, 45 power
valve, the long yellow secondary spring & sorry can't remember the
secondary metering plate i used.
So much trial & error getting it just right, but worked very well in
the end. Really good power & reasonable economy, as long as you
did'nt get into the secondary's to much. The only prob I had was poor
idle quality , due to big cam,low air speed through carb at idle engine
speeds. After 2 years of blipping the throttle all time, I went to
tripples, and because you are just starting on the 465, I wont tell
how much better they are:TEASE
Hope this helps a little.
Prior to the tripples i have on now, I was running a 465 on my
worked 202 for nearly 2 years. Before this 350 then 500 cfm
then 390 holleys. I've also tried the 34 adm webber & twin
stromy's, on the same engine.
I dont no anything about your 202 , but as long as its worked
enough to handle the extra carburation, the 465 is a good choice.
Certainly the best of the single carb combo's I have used on my
engine. I should say.. dyno runs were done with all the above
combo's. So no guess work !
As far as set up advise, in the 465 i had 59 primary jets, 45 power
valve, the long yellow secondary spring & sorry can't remember the
secondary metering plate i used.
So much trial & error getting it just right, but worked very well in
the end. Really good power & reasonable economy, as long as you
did'nt get into the secondary's to much. The only prob I had was poor
idle quality , due to big cam,low air speed through carb at idle engine
speeds. After 2 years of blipping the throttle all time, I went to
tripples, and because you are just starting on the 465, I wont tell
how much better they are:TEASE
Hope this helps a little.
#11
_Chamois hatch_
_Chamois hatch_
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Posted 16 April 2006 - 02:56 PM
and because you are just starting on the 465, I wont tell
how much better they are:TEASE
dont say that or im gonna buy tripples next! and i prommised my self that next thing for the torrie will be a v8! i really should put up a thread in the members projects section as its coming along nicely....
cheers
john
#12
_UCV80_
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Posted 19 April 2006 - 09:25 AM
How did your tunning go? does it run good?
,nathan
,nathan
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