LS1TECH - Camaro and Firebird Forum Discussion
LS1-LS2-LS3-LS6-LS7 PERFORMANCE
Generation III Internal Engine
MS4 vacuum at idle?

Generation III Internal Engine 1997-2006 LS1 | LS6

Sponsored by:

MS4 vacuum at idle?

Reply Subscribe

Search this Thread

Old

Oct 9, 2007 | 08:11 PM

#1

Thread Starter

On The Tree

iTrader: (1)

Joined: Oct 2006

Posts: 141

Likes: 0

From: Fairfield, OH

Default

MS4 vacuum at idle?

I have an MS4 cam, and I'm having trouble getting it running. I have pretty low manifold pressure at idle, 800 rpms. I have 71 kPa pressure, which equates to ~9 inHg vacuum. Is that normal?

Old

Oct 9, 2007 | 08:13 PM

#2

LS1TECH Sponsor

iTrader: (10)

Joined: Apr 2004

Posts: 2,774

Likes: 2

From: murrieta

Default

Quote:

Originally Posted by Kevin Doe

I have an MS4 cam, and I'm having trouble getting it running. I have pretty low manifold pressure at idle, 800 rpms. I have 71 kPa pressure, which equates to ~9 inHg vacuum. Is that normal?

not surprised that cam has alot of overlap, with a 238-240 cam in a ls2 i have seen 64 kpa at idle

Old

Apr 28, 2008 | 01:51 PM

#3

Thread Starter

On The Tree

iTrader: (1)

Joined: Oct 2006

Posts: 141

Likes: 0

From: Fairfield, OH

Default

Now that I've got it tuned up I see 60 kPa at idle, just an update. It was all in the tune.

Old

Apr 28, 2008 | 04:34 PM

#4

TECH Resident

iTrader: (6)

Joined: Jul 2004

Posts: 934

Likes: 0

From: West Palm Beach fl usa

Default

Quote:

Originally Posted by Kevin Doe

Now that I've got it tuned up I see 60 kPa at idle, just an update. It was all in the tune.

Is your engine still idling @ 800rpm?

Christian

Old

Apr 28, 2008 | 04:34 PM

#5

TECH Addict

iTrader: (24)

Joined: Jun 2003

Posts: 2,645

Likes: 0

From: St Joe, MO

Default

Quote:

Originally Posted by Kevin Doe

Now that I've got it tuned up I see 60 kPa at idle, just an update. It was all in the tune.

Just like he said. At an idle of 850 rpms I usually had 18" of vacuum

Reply Subscribe

cam, camshaft, idle, kpa, ls1tech, ms4, problems, vaccum, vacumm, vacuum

First
Prev
1 / 1
Next
Last

All times are GMT -5. The time now is 05:02 AM.