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Old 10-14-2004, 23:47   #1 (permalink)
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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?
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Old 10-14-2004, 23:56   #2 (permalink)
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Re: Appropriate manifold vacuum

Mine sits between 18 to 20...
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Old 10-14-2004, 23:59   #3 (permalink)
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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....
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Old 10-15-2004, 00:06   #4 (permalink)
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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...
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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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Old 10-17-2004, 02:00   #5 (permalink)
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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?
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Old 10-17-2004, 17:01   #6 (permalink)
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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.....
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Old 10-18-2004, 01:29   #7 (permalink)
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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 ;(
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