hi guy's
i have a set of triple 2" su's (HS8 with 100 thou jet) for my GTR and i need to know what needles are you guys running, i think the one i have are too lean as the car is really struggling to run..
i am running RH needles in there now, but i think they are too lean
the motor is basically a bathurst xu-1 specs
202+40thou oversize
large valve yella terra style head with a fair bit off porting
bathurst xu-1 cam ( wade cam)
i suspect i need RF or RB needles as they are richer through out the entire range.
triple 2" su's.... doe sany one run them? ?
Started by
_@milco@_
, Jan 19 2011 08:44 AM
8 replies to this topic
#2
warrenm
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Posted 20 January 2011 - 08:17 AM
I think you'll find that using RH (1 3/4")needles will lift the needle clear of the jet at wot. You best bet is to use .125" jets & start with a set UU,UP,UX (UM are std JAGUAR which also work ok) needles as a starting point. I tried to use the same set up that your referring to without much success, when I changed to .125" jets it all became easier.
#3
_threeblindmice_
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Posted 20 January 2011 - 08:30 AM
I went to Milel Sydney , I have a set not on anything yet ,they also suggested , and supply float bowl spacers to drop the bowl , and have the jets .
#4
_@milco@_
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Posted 20 January 2011 - 08:52 AM
I think you'll find that using RH (1 3/4")needles will lift the needle clear of the jet at wot. You best bet is to use .125" jets & start with a set UU,UP,UX (UM are std JAGUAR which also work ok) needles as a starting point. I tried to use the same set up that your referring to without much success, when I changed to .125" jets it all became easier.
mmmmm i have lifted the piston right up and the needle is still in jet it does not clear the jet...... this is possble due to me getting longer than standard jets used for 2" SU conversions?
they did have .125" jets in them to start but two need to be replaced and MIDEL suggested i go to .100" jets the carbys has UC needles and .125" jest to start so that would make them jag carbys?
#5
warrenm
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Posted 21 January 2011 - 04:33 PM
Here's some pics that might help explain the difference between the Jag HS-2 & the Rover HS-2.
The bell #1 is from a Jag that uses .125" needles. #2 is from a Rover using .100" needles, the centre post in #1 is 9mm shorter. The post can cut down using a Dremel.
This is a .125" at wot.
This is a .100" at wot.
You will also need to remove some of the top the post on the piston.
The bell #1 is from a Jag that uses .125" needles. #2 is from a Rover using .100" needles, the centre post in #1 is 9mm shorter. The post can cut down using a Dremel.
This is a .125" at wot.
This is a .100" at wot.
You will also need to remove some of the top the post on the piston.
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Edited by warrenm, 21 January 2011 - 04:33 PM.
#6
greens nice
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Posted 21 January 2011 - 05:31 PM
milco, the rover carbs have a different piston to the rest, the piston breathes inbetween the side of the dashpot and the slide. you can easily spot the difference because the jag carbs have two holes in the slide when you look from the top of the slide. did all the hd8 jag carbs have the air bleed for idle setting?
im not sure why they suggested to go with the 100 jet tubes?
also warren the problem with my car wasnt the carbs at all, i had points and a mallory 6al control box, swapped to the 265 hemi setup with magnetic pickup and all is sweet now.
im not sure why they suggested to go with the 100 jet tubes?
also warren the problem with my car wasnt the carbs at all, i had points and a mallory 6al control box, swapped to the 265 hemi setup with magnetic pickup and all is sweet now.
#7
warrenm
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Posted 23 January 2011 - 10:40 AM
You can see the difference with the pistons that "greens nice" referred to in the accompanying pics. The piston with the 2 x 5/16" vent holes is the Jag & the second piston is from a Rover that I modified as it wouldn't work properly, once I fitted .125" needles. After some attempts to plug the small hole (.030" or .040")in the piston I eventually fitted a plug then re-drilled 2 holes in the bottom of the piston.
Good to her that you have your car running properly "greens nice" but why did you fit a 265 dizzy & not a HEI from the blue black Holden?
All the HD-8 carbs in my collection have the air bleed arrangement, not sure if they are all the same.
Good to her that you have your car running properly "greens nice" but why did you fit a 265 dizzy & not a HEI from the blue black Holden?
All the HD-8 carbs in my collection have the air bleed arrangement, not sure if they are all the same.
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Edited by warrenm, 23 January 2011 - 10:44 AM.
#8
greens nice
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Posted 23 January 2011 - 04:38 PM
have had missfire problems with the blue dizzy like many others, the 265 dizzy is a far better setup.
#9
_@milco@_
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Posted 23 January 2011 - 08:15 PM
i have jag carbys going my the pictures you guys have listed. as my pistons all have the two large holes..
i have went about setting them up as per this article tuning su's on a holden 6 and they are running pretty good but i feel the needle are a bit lean due to the fact that i can wind the jet down about 4-5 turns and it does not even show a hint of black smoke i.e running rich... no matter what i do i cannot make it run rich, so i will buy some RF or RB needles and test them out...
to be continued...
i have went about setting them up as per this article tuning su's on a holden 6 and they are running pretty good but i feel the needle are a bit lean due to the fact that i can wind the jet down about 4-5 turns and it does not even show a hint of black smoke i.e running rich... no matter what i do i cannot make it run rich, so i will buy some RF or RB needles and test them out...
to be continued...
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