4.9 EF Futura

Hi all,

Just wondering what manifold vacuum one should expect to see when the Windsor 4.9L is at idle?

Currently seeing between 22in/Hg and 18in/Hg depending on weather etc.

Sound about right?

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1995 EF Futura: 4.9L V8 w/ Powerdyne Supercharger @ 7-8psi. Water Injection @ 3psi and above. Vortech Rising Rate FMU. 73mm C&L MAF. Shift Kit, VSS override, TCC override. Blue dash. Custom blue courtesy lights. Switched A/F meter, boost/vac and oil psi gauges. 6.5" TV, CarPC w/1500+ MP3, DVD and porn, precious porn

ebxr8240

Mine sits between 18 to 20...

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Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...

4.9 EF Futura

Cool. I appreciate the speedy reply.

Noting that your engine is *slightly* modified, lol, is there any reason it would differ from standard or 'normal' vac at idle? No offense, but your engine is a freak....

__________________
1995 EF Futura: 4.9L V8 w/ Powerdyne Supercharger @ 7-8psi. Water Injection @ 3psi and above. Vortech Rising Rate FMU. 73mm C&L MAF. Shift Kit, VSS override, TCC override. Blue dash. Custom blue courtesy lights. Switched A/F meter, boost/vac and oil psi gauges. 6.5" TV, CarPC w/1500+ MP3, DVD and porn, precious porn

ebxr8240

A custom turbo cam with specs like 236 inlet and 224 exh 545 lift and 114* lob centre..The 114* lob centre is what makes it bearable to drive..It has chopy idle but very good maners..The wider the l/c usually the wider power band, less over lap...
Umm hopefully good ring sealing helps as well..C.P pistons are known for this..
They have a groove between 1 ring and second.This allows compression in behind second compression ring for good sealing through small gas ports...

__________________
Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
.
Tuned & maintained by "Peppertree Perfmormance". Dart block, Scat 4340 steel crank, Custom C.P pistons.Oliver rods.. Mal Wood twin plate clutch.. Twin SC61/2's,482 rwkw/ 645 rwhp..
Passengers, myocardial infarction material..
R.I.P Possum...

Walkinshaw

Lobe center is key for idle, I got greedy with a 110LSA and the idle went out the window.

How are you measuring the vacuum?

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Ive been described as a vault of usless random knowledge.

Ill take it as a complement i think.............

4.9 EF Futura

The boost gauge has PSI/boost and inHg/vacuum. I should note my question does not arise from cam specs, i have been testing the vac system (which has a few extras on it now) for leaks. Havent found any so just wanted to confirm manifold vac reading is about right. I figure a vac leak would also be a boost leak so wanna be 110% sure.

Seems ok.....

__________________
1995 EF Futura: 4.9L V8 w/ Powerdyne Supercharger @ 7-8psi. Water Injection @ 3psi and above. Vortech Rising Rate FMU. 73mm C&L MAF. Shift Kit, VSS override, TCC override. Blue dash. Custom blue courtesy lights. Switched A/F meter, boost/vac and oil psi gauges. 6.5" TV, CarPC w/1500+ MP3, DVD and porn, precious porn

Walkinshaw

Cool, i just hooked up a boost guage i had liying arround, 400mm/Hg (15.7"), hence my idle problem ;(

__________________
Ive been described as a vault of usless random knowledge.

Ill take it as a complement i think.............