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post #1 of 7 (permalink) Old 10-15-04, 12:47 AM Thread Starter
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Appropriate manifold vacuum

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?


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
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post #2 of 7 (permalink) Old 10-15-04, 12:56 AM
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Re: Appropriate manifold vacuum

Mine sits between 18 to 20...

Don't be afraid to try something new. Remember, amateurs built the Ark...Professionals built the Titanic!
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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..
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post #3 of 7 (permalink) Old 10-15-04, 12:59 AM Thread Starter
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Re: Appropriate manifold vacuum

Quote:
Originally Posted by ebxr8240
Mine sits between 18 to 20...
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
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post #4 of 7 (permalink) Old 10-15-04, 01:06 AM
Two SC 61's = trouble
 
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Re: Appropriate manifold vacuum

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...
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post #5 of 7 (permalink) Old 10-17-04, 03:00 AM
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Re: Appropriate manifold vacuum

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?

Ive been described as a vault of usless random knowledge.

Ill take it as a complement i think.............
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post #6 of 7 (permalink) Old 10-17-04, 06:01 PM Thread Starter
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Re: Appropriate manifold vacuum

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
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post #7 of 7 (permalink) Old 10-18-04, 02:29 AM
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Re: Appropriate manifold vacuum

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.............
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