Vacum/idle?
Senior User
Joined: Oct 2003
Posts: 480
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From: Elyria, Ohio
vacuum readings
Study the following website and compare to the vacuum readings you measure and observe.
http://www.users.bigpond.com/ergoff/vac1.htm
http://www.users.bigpond.com/ergoff/vac1.htm
Thread Starter
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Freshman User
Joined: Feb 2004
Posts: 27
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Below is my super ford web site. I have the pics of the vacuum guage and the cam specs listed under rough idle. Check them out and tell me what you think.
my superford site
my superford site
Postmaster
Joined: Jun 2001
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The first thing I noticed, usually people mention when they convert to roller camshafts.
You do have roller lifters, correct?
CS-195R which is the cam you listed is a roller camshaft.
I could only find lobe C/L 112 so I will assume the intake and exhaust has a 112 centerline, (intake C/L + exhaust C/L divided by 2 = lobe seperation), which is 112 lobe seperation.
Are you sure this camshaft was recommended for speed density, 112-114 lobe seperation is usually recommended for stock speed density efi, but if the camshaft isn't designed to make x amount of vacuum, then your efi system will do what you have explained.
That or you have a vacuum leak, check all your vacuum lines.
You do have roller lifters, correct?
CS-195R which is the cam you listed is a roller camshaft.
I could only find lobe C/L 112 so I will assume the intake and exhaust has a 112 centerline, (intake C/L + exhaust C/L divided by 2 = lobe seperation), which is 112 lobe seperation.
Are you sure this camshaft was recommended for speed density, 112-114 lobe seperation is usually recommended for stock speed density efi, but if the camshaft isn't designed to make x amount of vacuum, then your efi system will do what you have explained.
That or you have a vacuum leak, check all your vacuum lines.
Posting Guru
Joined: Jul 2003
Posts: 1,486
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From: Independence, MO
The cam you have installed is too big for speed density, here are the specs for a CompCams cam specificaly ground for a SD system,
cam # 31-255-5
Grind # XE250H-14
valve lift: int- .462 exh- .474
dur. @ .50 int- 206 exh- .216
LSA 114
RPM range 1000 - 5200
Look at this and compare the differences, to make your motor run right you have to options, tear it down and change the cam and lifter out, or convert to Mas air, if its within you budget i would sugest converting to mas air, hope this helps GOOD LUCK! DW
cam # 31-255-5
Grind # XE250H-14
valve lift: int- .462 exh- .474
dur. @ .50 int- 206 exh- .216
LSA 114
RPM range 1000 - 5200
Look at this and compare the differences, to make your motor run right you have to options, tear it down and change the cam and lifter out, or convert to Mas air, if its within you budget i would sugest converting to mas air, hope this helps GOOD LUCK! DW
Thread Starter
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Freshman User
Joined: Feb 2004
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Well I guess you would say its bad news and bad news. How much would it be to convert to mass air? Is there a kit somewhere?
Oh, thanks for the bad news hahaha
At least I know now. Got tired of everyone telling me that I had a vacum leak, when I have checked everything to do with vacum.
Oh, thanks for the bad news hahaha
At least I know now. Got tired of everyone telling me that I had a vacum leak, when I have checked everything to do with vacum.
Posting Guru
Joined: Jul 2003
Posts: 1,486
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From: Independence, MO
summit racing and jegs both sell a conversion kit, there kinda pricey but it worth the conversion, a few people have gotton the parts from the boneyard and re wired and soldered there own harneses but my under standing is that it time consuming but can be done for less money. do a serch on the fourm here there have been several people do the conversion and numerous discusions on the subject. Good luck DW
Postmaster
Joined: Jun 2001
Posts: 4,496
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Another option, if your not looking to upgrade the motor any time soon, you could opt for a chip. later
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Lead Driver
Joined: Nov 2002
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From: Concord, NC
Doesn't a '95 351 have a E4OD transmission? Summit and Jeg's won't have a kit for trucks with that transmission. People like Pro-M might, but it's over $1000. Chip might be the best and cheapest way to get it running right, as jwtaylor said.
Posting Guru
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From: Independence, MO
Originally posted by jwtaylor
Another option, if your not looking to upgrade the motor any time soon, you could opt for a chip. later
Another option, if your not looking to upgrade the motor any time soon, you could opt for a chip. later
Postmaster
Joined: Jun 2001
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Originally posted by DW2455
the problem here is eratic vacuum and idle, cause: he installed as cam that to big for SPEED DENSITY so a chip will be of little help at this point.
the problem here is eratic vacuum and idle, cause: he installed as cam that to big for SPEED DENSITY so a chip will be of little help at this point.
Really, I was under the impression that a chip could be reporgramed to provide the proper fuel map, in order for the engine to react to different variables, such as lower vacuum properly, and smooth out the idle. Then again I am not 100%, but that was the impression I was getting. Let me know, as I am learning slowly the ways of the efi. later
Posting Guru
Joined: Jul 2003
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From: Independence, MO
Dont get me wrong, i'm not saying it wount help, but even with a new chip it's stillvery specific as to how much it can compensate for, his money but i dont think just a chip is gona compensate for .512 inch lift on the exhaust, but who knows DW