Re: why would a stock street hemi have only 5in vacuum ?
[Re: ogopogo]
#1533348
11/18/13 12:39 AM
11/18/13 12:39 AM
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Joined: Oct 2003
Posts: 2,537 PORT ALBERNI , BC., CANADA
superwrench
master
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master
Joined: Oct 2003
Posts: 2,537
PORT ALBERNI , BC., CANADA
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Just to give you a comparison of sorts.....I have a Racer Brown SSH-44 for a Hemi sitting on my shop shelf. It's a hydraulic 292* .510 lift cam that Direct Connection had 30 years ago. The reason it's on the shelf is for the very reason's you have pointed out in your post.....NO vacuum, pig rich running at idle and low speed, and all the other associated woes that a cam like that creates. My hemi car doesn't have Power brakes,but the 6" of vacuum that I had wouldn't have run them anyways. My is you need a cam down in the 276*-280* maximum (Not at .050 either) That cam made the car haul like hell up top, but you couldn't poke around town with it and enjoy the car. Just the stock solid in the car now, and that's what's staying in it.
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Re: why would a stock street hemi have only 5in vacuum ?
[Re: ogopogo]
#1533358
11/28/13 12:16 PM
11/28/13 12:16 PM
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Joined: Jun 2003
Posts: 52,972 Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
I did some online research before buying this cam and two moparts members have it in stock resto cars and are happy with it,I thought it speced out fairly mild?
Sooo,Cab says I should install it at 102 and cudaman is saying 112? Im getting confused here ! My local engine guy as well as BGR are saying 108 is good!
NO NO... they are talking 2 different things... Cab is saying to INSTALL at 102.. Cuda is talking LSA (lobe separation angle).... from your initial post you said you moved the timing pointer.... if thats the case your timing would be based on the od pointer... when installing a cam you set TDC on the piston then slide the cover on to verify the zero... so if you moved the pointer you changed a lot of factors.... back to the cam numbers... like Cab said I would INSTALL it at 102 or so for the lower end torque A cam that is installed retarded(as in 109 or higher) will have low vac
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Re: why would a stock street hemi have only 5in vacuum ?
[Re: ogopogo]
#1533360
11/28/13 01:25 PM
11/28/13 01:25 PM
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Joined: Jan 2004
Posts: 8,354 fredericksburg,va
cudaman1969
master
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master
Joined: Jan 2004
Posts: 8,354
fredericksburg,va
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Quote:
I did some online research before buying this cam and two moparts members have it in stock resto cars and are happy with it,I thought it speced out fairly mild?
Sooo,Cab says I should install it at 102 and cudaman is saying 112? Im getting confused here ! My local engine guy as well as BGR are saying 108 is good!
Just looked at some cams and Crane has a 660091 cam,284-294 with 112 lobe separation - 1500-5200 rpm great idle. This is what I'm saying, a good street cam that will give you the vacuum you need for stock carbs.
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Re: why would a stock street hemi have only 5in vacuum ?
[Re: cudaman1969]
#1533362
11/28/13 02:55 PM
11/28/13 02:55 PM
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Joined: Aug 2003
Posts: 43,309 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,309
Bend,OR USA
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Quote:
Quote:
I did some online research before buying this cam and two moparts members have it in stock resto cars and are happy with it,I thought it speced out fairly mild?
Sooo,Cab says I should install it at 102 and cudaman is saying 112? Im getting confused here ! My local engine guy as well as BGR are saying 108 is good!
Just looked at some cams and Crane has a 660091 cam,284-294 with 112 lobe separation - 1500-5200 rpm great idle. This is what I'm saying, a good street cam that will give you the vacuum you need for stock carbs.
Hemiroid motors don't like wide lobe seperation angles like above 110, even a street blower motor Same thing on close lobe centers(closer than 106), them dang hemirod motors are a pain to get right
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: why would a stock street hemi have only 5in vacuum ?
[Re: Cab_Burge]
#1533363
11/28/13 03:39 PM
11/28/13 03:39 PM
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Joined: Mar 2006
Posts: 9,883 MI, usa
dvw
master
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master
Joined: Mar 2006
Posts: 9,883
MI, usa
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Quote:
Quote:
Quote:
I did some online research before buying this cam and two moparts members have it in stock resto cars and are happy with it,I thought it speced out fairly mild?
Sooo,Cab says I should install it at 102 and cudaman is saying 112? Im getting confused here ! My local engine guy as well as BGR are saying 108 is good!
Just looked at some cams and Crane has a 660091 cam,284-294 with 112 lobe separation - 1500-5200 rpm great idle. This is what I'm saying, a good street cam that will give you the vacuum you need for stock carbs.
Hemiroid motors don't like wide lobe seperation angles like above 110, even a street blower motor Same thing on close lobe centers(closer than 106), them dang hemirod motors are a pain to get right
I built a Hemi for my buddy's 69 Road Runner. A friend recommended a cam with a 114 LCA. The car Idles like a 318. Has great low end and pulls to 6000. All stock (still has the original exhaust from 69) 13.00@107. I would have never chosen this cam but he swore it would work. He was correct. Doug
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