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Re: Pick me a cam
[Re: Mebsuta]
#1391178
02/23/13 12:30 AM
02/23/13 12:30 AM
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Joined: Jul 2008
Posts: 259
Khemi, Stygia
Mebsuta
enthusiast
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enthusiast
Joined: Jul 2008
Posts: 259
Khemi, Stygia
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I guess I need to call Isky. Anything greater than a 108 LSA and I'll be laughed out of Sonic Happy Eating.
68 Roadrunner. 383 4-spd. Beat up.
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Re: Pick me a cam
[Re: 1_WILD_RT]
#1391179
02/23/13 01:22 PM
02/23/13 01:22 PM
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Joined: Jan 2009
Posts: 106
Poland
willard
member
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member
Joined: Jan 2009
Posts: 106
Poland
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Quote:
Quote:
W.H.I.P.L.A.S.H. Here's a cam for ya!
I'm leaning toward the Comp, I've run it before in a smallblock & it's a strong choice.... I was hoping someone might post a wildcard choice just cause I like to be different...
The Whiplash isn't an option, I've got to high of C/R to consider it.. straight from Hughes website.. ""These are killer cruising cams made for low compression (8:1-8.75:1) engines and are designed so the cylinder pressure will not be reduced (Torque Killer!) like other cams of this size or type. " I'm gonna be a full point higher which means my cylinder pressure would be well into the detonation zone....
Thats/ intresting as I enquired Hughes about my 383 with 10.4:1, source heads, stock intake/exhaust, his stall mopar vert, 3.55 rear and they said it would be fun and go for it...
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Re: Pick me a cam
[Re: BSB67]
#1391181
02/23/13 11:04 PM
02/23/13 11:04 PM
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Joined: Mar 2007
Posts: 3,300
Northern Indiana
Dunnuck Racing
master
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master
Joined: Mar 2007
Posts: 3,300
Northern Indiana
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Sorry it took me a while to expand on things. I usually willingly give out any and all information . Since I just sent in two articles that cover a couple of topics on here,they wont reach the stands for a few months.
So as not to make the articles worthless to the publisher,I need to not give away too much of it so Ill be brief.
I started the cam testing on this 360 a set of cheap 1 5/8" headers. I tests a few cams of similar size . One was a dual pattern,one was a single pattern both with the same basic intake lobes. Then I ttested a cam with the same intake closing point,but was split pattern with a narrower lsa.
After seeing how things acted,I went back and repeated the testing with manifolds and a couple different header designs.
On this engine ,a basic small block,and sseveral other combinations I have spent a lot of time on,they all made more peak torque and had wider power bands with narrow lsa cams compared to similar cams with wider lsa.
I will be the first to admit,I have not worked with every combination possible.
Most Mopar small and big blocks favor narrow lsa cams,and Im not the only guy that thinks so.
MOST cam companies spread the lsa out a couple degrees over optimum to help with idle and vacuum on a lot of their " performance" cams because they feel we will pick a cam with too much duration .
Keith
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Re: Pick me a cam
[Re: 1_WILD_RT]
#1391182
02/23/13 11:07 PM
02/23/13 11:07 PM
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Joined: Nov 2009
Posts: 2,177
ill
dennismopar73
top fuel
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top fuel
Joined: Nov 2009
Posts: 2,177
ill
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Quote:
I'm playing around with the idea of a cam swap in my Challenger, nothing big just hoping to optimize what I have..
The Car...
!970 Challenger R/T Vert.. Heavy probably 3700lbs
3.23 gear which is staying, this is a highway cruiser not a hotrod
727 with stock convertor currently it with flash 2200ish
Stock exhaust manifolds to tips
Stock A/C, going to change to a Sanden compressor
The Engine...
Original 383 with 75K miles since O/H
.030 O/S KB 162 pistons .018 in the hole 5cc valve trough
with the current 906 heads C/R is around 8.2-1
But I'm changing to a set of 915 heads which have been cut .030 which reduced chamber volume to 76cc
New C/R should be 9.7
Current cam is the OE Resto cam
Intake is a Performer RPM & Carb is a Holley 4776 600cfm D/P
I've jetted it down four sizes & opened the PVCR's
I know the official stance is a heavy car with tall gears should have a vacuum secondary carb but it runs well & I accept the fuel mileage..... 
So lets hear your thoughts...
I would not go over a 270h comp cam ,keep the the c/l @ 105,108 install at @ 102
Watch your push rod lenghts as they can be to short for a hyd situation?
Not much diff in your assumed comp pick up.
a little short on carb JMO
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Re: Pick me a cam
[Re: dennismopar73]
#1391183
02/24/13 09:41 PM
02/24/13 09:41 PM
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Joined: Aug 2005
Posts: 4,800
ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,800
ILL
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Quote:
Quote:
I'm playing around with the idea of a cam swap in my Challenger, nothing big just hoping to optimize what I have..
The Car...
!970 Challenger R/T Vert.. Heavy probably 3700lbs
3.23 gear which is staying, this is a highway cruiser not a hotrod
727 with stock convertor currently it with flash 2200ish
Stock exhaust manifolds to tips
Stock A/C, going to change to a Sanden compressor
The Engine...
Original 383 with 75K miles since O/H
.030 O/S KB 162 pistons .018 in the hole 5cc valve trough
with the current 906 heads C/R is around 8.2-1
But I'm changing to a set of 915 heads which have been cut .030 which reduced chamber volume to 76cc
New C/R should be 9.7
Current cam is the OE Resto cam
Intake is a Performer RPM & Carb is a Holley 4776 600cfm D/P
I've jetted it down four sizes & opened the PVCR's
I know the official stance is a heavy car with tall gears should have a vacuum secondary carb but it runs well & I accept the fuel mileage.....
So lets hear your thoughts...
I would not go over a 270h comp cam ,keep the the c/l @ 105,108 install at @ 102
Watch your push rod lenghts as they can be to short for a hyd situation?
Not much diff in your assumed comp pick up.
a little short on carb JMO
The 270H COMP is what I use for stock hp 440 resto builds.
MLR426
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