Re: Hemi Cross Ram from Edelbrock
[Re: 4mopower]
#2451364
02/13/18 08:19 PM
02/13/18 08:19 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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IMHO flow is easy, the hard parts: 1. mixture distribution 2. plenum volume 3. response 4. tuned length
Boffin Emeritus
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Re: Hemi Cross Ram from Edelbrock
[Re: polyspheric]
#2451377
02/13/18 09:01 PM
02/13/18 09:01 PM
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Joined: Apr 2005
Posts: 1,505 TN
SCATPACK 1
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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Plenum Volume? Too much or not enough?
Old Geezer Racing
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Re: Hemi Cross Ram from Edelbrock
[Re: 4mopower]
#2451380
02/13/18 09:08 PM
02/13/18 09:08 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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EXACTLY! I'd like not only the comparison with OEM factory, but also the distance from the flange to the floor, is there a left-right partial dam, blah. I would guess shorter runners may add some peak power due to moving the tuned length up, but is this done by sinking their entries into the floor, or what?
Boffin Emeritus
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Re: Hemi Cross Ram from Edelbrock
[Re: polyspheric]
#2451384
02/13/18 09:17 PM
02/13/18 09:17 PM
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Joined: Apr 2005
Posts: 1,505 TN
SCATPACK 1
pro stock
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pro stock
Joined: Apr 2005
Posts: 1,505
TN
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EXACTLY! I'd like not only the comparison with OEM factory, but also the distance from the flange to the floor, is there a left-right partial dam, blah. I would guess shorter runners may add some peak power due to moving the tuned length up, but is this done by sinking their entries into the floor, or what? They actually offered 2 versions of the bottom. The inline top had a bottom with a divider down the middle. The cross ram set up did not include this divider. I ran the inline top most of the time. I had both tops and the inline was more consistent. I assumed it was the divider. I hope these pictures show up. Chrysler recommended some air dams be welded into the intakes on both sides to even out the air flow to certain cylinders.
Old Geezer Racing
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Re: Hemi Cross Ram from Edelbrock
[Re: 4mopower]
#2451457
02/13/18 11:42 PM
02/13/18 11:42 PM
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Joined: Dec 2007
Posts: 12,587 Great Neck,LI,new york
hemi-itis
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
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I have a bottom for 20 years,I was going to fab a top and then fell into a tunnel ram with carbs. Funny,I remember when I bought it,,,,,,it actually had rat poop in it
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Hemi Cross Ram from Edelbrock
[Re: polyspheric]
#2451464
02/13/18 11:55 PM
02/13/18 11:55 PM
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Joined: Mar 2006
Posts: 2,675 Mt. Eden Ky.
Hemi Allstate
master
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master
Joined: Mar 2006
Posts: 2,675
Mt. Eden Ky.
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I have not yet run mine, as I am testing other options first, and have very few passes on my car. The guys that I have talked to recommend a spacer between the lid and the bottom, a 1/2" or more.( more plenum?) Also to fill the lower areas with epoxy to prevent fuel puddles. There are additional mods to be done to the inside as suggested to me by a Moparts member that had done extensive testing of this manifold. Herb McCandless told me they did very well on the dyno, but failed on the track !? I added two NOS pop off valves to mine as they are notorious for back firing and cracking the lid. Mark
1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019
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Re: Hemi Cross Ram from Edelbrock
[Re: 4mopower]
#2451473
02/14/18 12:11 AM
02/14/18 12:11 AM
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Joined: Dec 2007
Posts: 12,587 Great Neck,LI,new york
hemi-itis
I Live Here
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I Live Here
Joined: Dec 2007
Posts: 12,587
Great Neck,LI,new york
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I was told to use a 1 inch spacer if I fabbed a flat top with 1 inch carb spacers. There is data on these rats out there,,,,somewhere.
HEMI-ITIS has no cure. My condition is fully BLOWN!!
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Re: Hemi Cross Ram from Edelbrock
[Re: 4mopower]
#2451489
02/14/18 12:43 AM
02/14/18 12:43 AM
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Joined: Jan 2003
Posts: 42,714 Spokane Washington
ScottSmith_Harms
Mr Wizzard
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Mr Wizzard
Joined: Jan 2003
Posts: 42,714
Spokane Washington
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I ran one on a SS/DA Hemi (69 Road Runner in the 1980's). It was the best intake allowed in the class (inline dual 4's). Great race intake for the day if setup properly but it's an antiquated design compared to modern intakes which make a LOT more power with less fussing around. As far as a street intake, I used one on my Hemi Cuda for a while (same era) and it was a PIA, fouled plugs, backfire sneezes, and the like were common. Bottom line, they are not designed for the street, fuel distribution at low rpm's is horrible even with all the dam work to help it, they just weren't designed for it. Yes, you can make one work but count on some headaches in tuning.
.02
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Re: Hemi Cross Ram from Edelbrock
[Re: 4mopower]
#2451764
02/14/18 06:41 PM
02/14/18 06:41 PM
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Joined: Jan 2003
Posts: 2,763 Walton's Mountain, Pa
Steve1118
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master
Joined: Jan 2003
Posts: 2,763
Walton's Mountain, Pa
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Raced with one for many years. The reason it was developed in line was because NHRA rules at the time dictated an aftermarket intake could be used as long as the carbs were in the same configuration.
It was better than the stock inline, and marginally better than the Vanke modified inline. We ran both, and the RR was about .05 quicker than the Vanke. Spacing the lid up an inch did help. They were also a high rpm type intake, due to the short runner length. We used one with the cross ram lid, as well, and Bob George highly modified it inside. It lowered the rpm range a bit, and gave it a bit more bottom end, but was still not ideal.
They had a tendency to blow up. Many of them that you will see have welds and cracks on the lid, this was caused by fuel puddling.
I'd never run one on the street.....such a PITA. Until the intake got warm, they ran like a box of rocks. Someone said plug fouling, all of it. They were designed to operate at some rpm and did not like idling, putsying around. They are not a big torque maker, lacking on bottom end and adding some to the top.
They worked in a higher rpm band....around 7K as compared to the stock crossram which operated at 67-6900 rpm.
It was legal, and the best option for class racing a street hemi back in the day, but was never a real good setup.
Depending on what you are doing, you'd be much happier with the Chrysler MP crossram. They are much, much superior and better. You can't beat the regular CR. We run one on our NSS car now....shift it at 6700 rpm, even idles and starts easier. We've run both in the past, and the CR is much, much better.
Last edited by Steve1118; 02/14/18 09:16 PM.
"Old age and treachery trumps youth and enthusiasm, every time!" East Central Director / Chrysler Power Magazine www.reasbeckracing.webs.com
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Re: Hemi Cross Ram from Edelbrock
[Re: 4mopower]
#2451780
02/14/18 07:05 PM
02/14/18 07:05 PM
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Joined: Dec 2005
Posts: 2,041 New Jersey
Qwik426
top fuel
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top fuel
Joined: Dec 2005
Posts: 2,041
New Jersey
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Has anyone ever used or know anything about the old Edelbrock Crossram for a Hemi? It looks like a Rat Roadster from Edelbrock only a CR version.
Regards, John I once asked Herb McCandless about this intake. He told me that during testing the car would MPH like crazy but it would ET poorly. Pete
Last edited by Qwik426; 02/14/18 09:51 PM.
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Re: Hemi Cross Ram from Edelbrock
[Re: Steve1118]
#2451859
02/14/18 09:50 PM
02/14/18 09:50 PM
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Joined: Dec 2005
Posts: 2,041 New Jersey
Qwik426
top fuel
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top fuel
Joined: Dec 2005
Posts: 2,041
New Jersey
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The reason for that is that they really suffered on the bottom end. Yep. That's why the ET's were poorer than than the standard twin four barral Rat Roaster.
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Re: Hemi Cross Ram from Edelbrock
[Re: 4mopower]
#2451875
02/14/18 10:25 PM
02/14/18 10:25 PM
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Joined: Oct 2007
Posts: 4,206 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,206
New York
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intake allowed in the class Some rude person was asked back in the day to define a "legal manifold": he said "If it says 'Edelbrock' on it". To me as long as the carbs were in the same configuration has nothing to do with where the carburetors sit, it has everything to do with what they completely changed: do only 4 cylinders (1 4 6 7) share one side of the carburetors, and the other 4 (2 3 5 8) share the opposite side? No? How is it the same? Read my article (for Mopar Action): http://victorylibrary.com/mopar/intake-tech.htm
Boffin Emeritus
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Re: Hemi Cross Ram from Edelbrock
[Re: polyspheric]
#2451890
02/14/18 10:55 PM
02/14/18 10:55 PM
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Joined: Jan 2003
Posts: 2,763 Walton's Mountain, Pa
Steve1118
master
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master
Joined: Jan 2003
Posts: 2,763
Walton's Mountain, Pa
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Under NHRA rules at the time, to be legal for Super Stock is that the carburetors had to remain in the stock configuration. Therefore, as the street hemi carbs were in line AFBs, that's what they had to be. So, the Rat Roaster was first in inline AFB deal on a big plenum.
Later on the came up with the lids for the single four barrel, for AHRA Formula racing, and the cross ram lid as a substitute for the Chrysler Cross Ram. It was no where near as good, but some guys got along with them.
It wasn't like it is today. No sheet metal, no home made intakes. The cross rams they use on the AH cars today would never pass muster. Neither would the sheetmetal in lines with the big runners that they used on the Street Hemi SS cars.
"Old age and treachery trumps youth and enthusiasm, every time!" East Central Director / Chrysler Power Magazine www.reasbeckracing.webs.com
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