SAC vs VCO

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Re: SAC vs VCO

Postby spencerdiesel » Sun Jan 17, 2016 7:45 pm

My friend took the fuel screw the rest of the way to the bottom (about 1 turn), and nothing. No idle increase, no attempt to runaway (IC pump).....and no power difference.

I've gathered (or maybe made it up in my head :roll: ) that the 1st turn on the screw will add more hp than say the last turn before runaway. Is that wrong?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
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Re: SAC vs VCO

Postby PToombs » Mon Jan 18, 2016 5:10 pm

I've never heard that. Quit thinking with the little head and you won't have those problems. And a bunch of others too! ;)
pete

Just enough power to break everything behind the crankshaft.
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Re: SAC vs VCO

Postby RCCUMMINS89 » Mon Jan 18, 2016 5:56 pm

Only way 1 turn can be different are a few different ways................

1 - a simple geometery relation.....if a screw is pushing on something that is 180 degrees (though it is not even close to that) it wont move the other end of a fulcrum the same distance as if it is 90 degrees to a screw. Those numbers I used are made up numbers in order to EXAGGERATE the point I'm making in geometry.

2 - the internal h/r pressures toward the last part of the duration are too much and one is literally getting blow by. Small injectors would exaggerate this affect. This affect is 100% accurate and true to what happens. If it were not, one would have the SAME cc output, regardless the size of the injectors.



So.......Pete........ maybe you aren't the one who can keep up, because his head his larger.......BURN!!!!!!


:lol: :lol: :lol: :mrgreen: :mrgreen: :mrgreen: :mrgreen:
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: SAC vs VCO

Postby spencerdiesel » Tue Jan 19, 2016 9:43 am

Much appreciated, the fulcrum angle/geometry you spoke of makes sense. I've wondered about it for some time
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
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Re: SAC vs VCO

Postby spencerdiesel » Sun Mar 06, 2016 4:15 pm

For DD that may tow some, what's the biggest recommended injector in 5,6 and 7 hole count? The 7 won't interest me, but still curious.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
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Re: SAC vs VCO

Postby RCCUMMINS89 » Sun Mar 06, 2016 5:43 pm

For a 92, 6 hole.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: SAC vs VCO

Postby spencerdiesel » Sun Mar 06, 2016 7:15 pm

Thanks.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
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Re: SAC vs VCO

Postby RCCUMMINS89 » Sun Mar 06, 2016 7:24 pm

6 hole runs the cleanest sub 1800 ish rpm. Above that, 5 hole and 6 hole run fairly similar.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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Re: SAC vs VCO

Postby spencerdiesel » Sun Mar 06, 2016 7:50 pm

Will a 6 hole that flows 50 lpm spool a turbo any different than 50 lpm 5 hole?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
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Re: SAC vs VCO

Postby RCCUMMINS89 » Sun Mar 06, 2016 8:01 pm

Yes and no.....only in instances where the 5 is flooding things out will it make a difference.
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
RCCUMMINS89
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Re: SAC vs VCO

Postby spencerdiesel » Sun Mar 06, 2016 8:08 pm

As in gross over fueling?

The 6x13's I've been seeing seem to be really popular is why I'm asking.
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
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Re: SAC vs VCO

Postby spencerdiesel » Sun Mar 06, 2016 8:09 pm

For a good running DD
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
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Posts: 1022
Joined: Tue Oct 27, 2015 4:02 pm
Location: Brevard, NC
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Re: SAC vs VCO

Postby RCCUMMINS89 » Sun Mar 06, 2016 8:29 pm

Flooding pre boost is easier with 5 hole than 6.

What turbo again?
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
RCCUMMINS89
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Re: SAC vs VCO

Postby spencerdiesel » Mon Mar 07, 2016 7:39 pm

Eventually your 62. But unfortunately an h1c or hx for a while :?

If I backed the screw off the fulcrum lever, could that size injector be run and be tamed to under 40 psi with an HX?
1992 W250, 5 speed, 4.10, Ext. cab Ext. bed, 12.5k winch, 75 gal. fuel tank

Fuel: THD 12 psi piston pump, THD fuel pin, 366 spring, fuel screw bottomed @ 3 turns, timing bumped 3/16"
Muffler delete
spencerdiesel
14mm rotor
 
Posts: 1022
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Re: SAC vs VCO

Postby RCCUMMINS89 » Mon Mar 07, 2016 8:17 pm

Yea
89 RC on shortened 92 diesel frame - NV4500 w/dual disc/4.10s on 37s. - Self built pump, "hot screw", lots of timing, True high volume low pressure lift pump, 62fmw/68/.7gated, 77lpm SAC Inj., Studs/O-rings,- 423/1220 Mustang - 11/16/2013 http://www.TheHungryDiesel.com full line dealer, if you don't see it please ask.
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