Timing and jetting dual Holley 4150 800cfm's on supercharged 509?
07-04-2007, 03:48 AM
#1
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Timing and jetting dual Holley 4150 800cfm's on supercharged 509?
I'm about to start up my rebuilt 509 with a 8-71 blower and two Holley 4150 (9022) 800cfm's.
What jets and powervalves etc should I begin with? (Standard jetting from Holley is 72 / 87 and 6.5 PV.)
At what angle should I put my timing?
Do you have a HP guess for this engine?
The engine is as follows:
Block: Merlin II 509ci
Crank: Callies
Rods: Manley H-Beam
Pistons: JE blower pistons (757F)
Piston rings: Total seal TNT gapless top
Cam: Marine Kinetics Hyd roller
242º/250º @ .050" / .646"/646" lift valve / 112LSA
Wot RPM: 5700-5800rpm
Heads: GM 188
Head gaskets: FelPro MLS
C/R: 8.3
Valves: 1.88/2.25
Rockers: Jesel Comp Series 1.7
Intake: Blower intake
Intercooler: Superchiller
Blower: BDS 8-71
Boost: 52T/49T (+/- 5.8% overdrive) About 8psi
Carbs: 2x Holley 9022 800cfm (Holley std jetting: 72 / 87 / 6.5PV) Not boost referenced
Ignition: Thunderbolt IV
Distributor: MSD 84891 Crab cap
Exhaust: Stainless Marine Gen III with 4.5" dry tails
Fuel: 91 or 93octane
/Tomas
What jets and powervalves etc should I begin with? (Standard jetting from Holley is 72 / 87 and 6.5 PV.)
At what angle should I put my timing?
Do you have a HP guess for this engine?
The engine is as follows:
Block: Merlin II 509ci
Crank: Callies
Rods: Manley H-Beam
Pistons: JE blower pistons (757F)
Piston rings: Total seal TNT gapless top
Cam: Marine Kinetics Hyd roller
242º/250º @ .050" / .646"/646" lift valve / 112LSA
Wot RPM: 5700-5800rpm
Heads: GM 188
Head gaskets: FelPro MLS
C/R: 8.3
Valves: 1.88/2.25
Rockers: Jesel Comp Series 1.7
Intake: Blower intake
Intercooler: Superchiller
Blower: BDS 8-71
Boost: 52T/49T (+/- 5.8% overdrive) About 8psi
Carbs: 2x Holley 9022 800cfm (Holley std jetting: 72 / 87 / 6.5PV) Not boost referenced
Ignition: Thunderbolt IV
Distributor: MSD 84891 Crab cap
Exhaust: Stainless Marine Gen III with 4.5" dry tails
Fuel: 91 or 93octane
/Tomas
Last edited by tomas_wallin; 07-05-2007 at 08:42 AM.
07-05-2007, 07:44 AM
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Well I can help you with timing and HP guess... I'd run 32 degrees and I think you will make ~825-850HP.
I don't know Holly 800's, but jetting on Demon 825's and almost the same set-up is 87 / 92 with boost referenced 4.5 pv in primary only, no pv in 2nd dary. Keep in mind Demons are totally set up different than Holly.
Also...make sure you run 93 Octane....or take some boost out of it with those iron heads if you plan on staying in it for long periods...
I don't know Holly 800's, but jetting on Demon 825's and almost the same set-up is 87 / 92 with boost referenced 4.5 pv in primary only, no pv in 2nd dary. Keep in mind Demons are totally set up different than Holly.
Also...make sure you run 93 Octane....or take some boost out of it with those iron heads if you plan on staying in it for long periods...
07-05-2007, 12:10 PM
#5
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How do you know the boost if ya havnt run it yet?
Looks like a nice combo.
Timing 32 locked.
No pv secondary increase jet size 7 numbers.
Primary should be boost refernced and you will need
to see where your vacuum boost is while running
a 6.5 should be good to start with.
Make sure you have the big acceleartor pumps in
the front atleast. Otherwise you may have a flat spot
when you whack it.
Just like Jdnca1 said make sure ya run the good gas.
Do a search on here reading plugs read it and learn it.
Stay on the fat side of jetting and you will be safe.
Good Luck
Gerry
Looks like a nice combo.
Timing 32 locked.
No pv secondary increase jet size 7 numbers.
Primary should be boost refernced and you will need
to see where your vacuum boost is while running
a 6.5 should be good to start with.
Make sure you have the big acceleartor pumps in
the front atleast. Otherwise you may have a flat spot
when you whack it.
Just like Jdnca1 said make sure ya run the good gas.
Do a search on here reading plugs read it and learn it.
Stay on the fat side of jetting and you will be safe.
Good Luck
Gerry
07-06-2007, 07:22 AM
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How do you know the boost if ya havnt run it yet?
Looks like a nice combo.
Timing 32 locked.
No pv secondary increase jet size 7 numbers.
Primary should be boost refernced and you will need
to see where your vacuum boost is while running
a 6.5 should be good to start with.
Make sure you have the big acceleartor pumps in
the front atleast. Otherwise you may have a flat spot
when you whack it.
Just like Jdnca1 said make sure ya run the good gas.
Do a search on here reading plugs read it and learn it.
Stay on the fat side of jetting and you will be safe.
Good Luck
Gerry
Looks like a nice combo.
Timing 32 locked.
No pv secondary increase jet size 7 numbers.
Primary should be boost refernced and you will need
to see where your vacuum boost is while running
a 6.5 should be good to start with.
Make sure you have the big acceleartor pumps in
the front atleast. Otherwise you may have a flat spot
when you whack it.
Just like Jdnca1 said make sure ya run the good gas.
Do a search on here reading plugs read it and learn it.
Stay on the fat side of jetting and you will be safe.
Good Luck
Gerry
Regarding the boost it's a estimate and comparison from previous year with the old pulleys.
Do you mean I should increase the jets with 7# from the standard ones from Holley 72/87 to 79/94?
07-06-2007, 02:34 PM
#7
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When you run a powervalve plug you would want to
increase 6-8 jet sizes to componsate.
I would run a plug in the secondary and increase jet sizes.
Then boost ref the primary power valve.
Are you adding boost from last season?
Are your carbs side saddle or inline?
07-07-2007, 04:18 AM
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Oh I see. You ran a similar combo last season?
When you run a powervalve plug you would want to
increase 6-8 jet sizes to componsate.
I would run a plug in the secondary and increase jet sizes.
Then boost ref the primary power valve.
Are you adding boost from last season?
Are your carbs side saddle or inline?
When you run a powervalve plug you would want to
increase 6-8 jet sizes to componsate.
I would run a plug in the secondary and increase jet sizes.
Then boost ref the primary power valve.
Are you adding boost from last season?
Are your carbs side saddle or inline?
One or the PV's is already plugged (in both carbs). I will skip the boost ref for now, really have no time for it for the moment.
The carbs are mounted side by side, like yours in your avatar..
Last edited by tomas_wallin; 07-07-2007 at 04:21 AM.
07-09-2007, 08:05 AM
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Ok, I will lock the distributor at 32deg's and keep the old jets as they were (78/96) when I start it up today.
The dyno guy will take care of the rest at the dyno on thursday.
Thanks you guys!
The dyno guy will take care of the rest at the dyno on thursday.
Thanks you guys!
07-09-2007, 08:57 AM
#10
Geronimo36
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I'm about to start up my rebuilt 509 with a 8-71 blower and two Holley 4150 (9022) 800cfm's.
What jets and powervalves etc should I begin with? (Standard jetting from Holley is 72 / 87 and 6.5 PV.)
At what angle should I put my timing?
Do you have a HP guess for this engine?
What jets and powervalves etc should I begin with? (Standard jetting from Holley is 72 / 87 and 6.5 PV.)
At what angle should I put my timing?
Do you have a HP guess for this engine?
I'd go 32 on the timing but see what the dyno likes best.
