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Registered
Join Date: Mar 2008
Posts: 20
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vacuum
Does anyone know how much vacuum a US 4.5L CIS engine should pull at idle? I can't find a spec in the manuals.
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07-29-2008, 09:28 PM
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RicerSchnitzzzle
Join Date: Jun 2008
Posts: 385
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About 25 inHg after the TB
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'81 Euro 'S' 928 5-Speed 5.0L Hybrid "Ricerschnitzzzle" Wish list: RollBar, New Helmet and driving lessons  Wishes Done: Body kit, seats, No cat, Headers, X, Afterburners, 3" exhaust, short shifter , 17" TT Rims, 250HP N2O, MSD ignition w/retard+rev limit, MSD billet distributor, Accel Coil. 5.0L block, ported heads, JE race springs + .503 "S+" cams |
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07-29-2008, 09:31 PM
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Registered
Join Date: Mar 2008
Posts: 20
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That seems kind of high for a V8. I'm pulling 15 inches now. The motor is rebuilt with a custom set of gapless piston rings. The baseline before I tore the motor down was about 9 inches. With the new rings I was expecting more vacuum, but I don't have a factory baseline as a reference point.
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07-29-2008, 10:19 PM
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RicerSchnitzzzle
Join Date: Jun 2008
Posts: 385
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My $30 pillar gauge could be wrong.
__________________
'81 Euro 'S' 928 5-Speed 5.0L Hybrid "Ricerschnitzzzle" Wish list: RollBar, New Helmet and driving lessons Wishes Done: Body kit, seats, No cat, Headers, X, Afterburners, 3" exhaust, short shifter , 17" TT Rims, 250HP N2O, MSD ignition w/retard+rev limit, MSD billet distributor, Accel Coil. 5.0L block, ported heads, JE race springs + .503 "S+" cams |
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07-29-2008, 10:49 PM
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