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Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
#448522
08/24/09 09:35 PM
08/24/09 09:35 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
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Seen the other guys talking about exploding intakes, so I though Id better ask here. Could this be a problem on the MP Hemi Cross Ram? These intakes are pretty expensive, and haven't been in production awhile.. Max Maniac I would like to know some details of that "pop off Valve". And no replacement parts to buy. Do you know what kind of pressure were looking at? Also I assume the intake has been threaded, or a bolt jammed with holes drilled around it correct? How does the seal seat? is there a O-ring or receiver grooves? I would love to see some pictures disassembled etc. Me and My crew chief would be grateful for any info guys... 
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: Bob_Coomer]
#448523
08/24/09 10:31 PM
08/24/09 10:31 PM
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Joined: Jan 2003
Posts: 6,354
Aurora, Oh.
max_maniac
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Aurora, Oh.
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Max Maniac I would like to know some details of that "pop off Valve". And no replacement parts to buy. Do you know what kind of pressure were looking at? Also I assume the intake has been threaded, or a bolt jammed with holes drilled around it correct? How does the seal seat? is there a O-ring or receiver grooves? I would love to see some pictures disassembled etc. Me and My crew chief would be grateful for any info guys... If I can get to the garage sometime tomorrow I can get some pics of the set up. This was done to both of my intakes by Bob George. There is a bolt through the intake with holes drilled around it and they are sealed with rubber o rings glued to the cover. It has worked for me so far  maybe BG can respond to the pressure settings since he installed them but when I took one apart I kind of went by feel on how tight they should be. I never used them or had a problem when I was running the oe cross ram but have heard stories of them bursting open also. PS: Looks like a really sharp crew chief ya got there  Russ 
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: max_maniac]
#448530
08/30/09 08:02 PM
08/30/09 08:02 PM
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Anonymous
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Anonymous
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i ran my 440-25 crossram all day today with 7 passes with not 1 backfire.the trick is no gas before firing it up warm. 
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
#448531
08/30/09 08:11 PM
08/30/09 08:11 PM
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Joined: Jan 2003
Posts: 6,354
Aurora, Oh.
max_maniac
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Quote:
i ran my 440-25 crossram all day today with 7 passes with not 1 backfire.the trick is no gas before firing it up warm.
I agree but that is not how the 2nd intake I had made a big bang. The 2nd one happened when the car was running and I was driving through the pits. I later did find a carb issue that was dumping fuel so in case that ever happens again I have some insurance I can still race that weekend.
Russ
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: max_maniac]
#448532
08/30/09 08:19 PM
08/30/09 08:19 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
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were can I get one of those at Max? Or do you have two of them?
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: max_maniac]
#448533
08/30/09 08:22 PM
08/30/09 08:22 PM
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Anonymous
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Anonymous
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Quote:
Quote:
i ran my 440-25 crossram all day today with 7 passes with not 1 backfire.the trick is no gas before firing it up warm.
I agree but that is not how the 2nd intake I had made a big bang. The 2nd one happened when the car was running and I was driving through the pits. I later did find a carb issue that was dumping fuel so in case that ever happens again I have some insurance I can still race that weekend.
Russ
Russ, i understand fully, these intakes are a little tricky at first but once you get the jetting, metering rods, and most importantly the fuel bowls correctly adjusted, fuel psi at no more than 6.5, your golden.
i can understand being gun shy after exploding 2 but really look over your carbs thoroughly before firing it up. just 3 pumps at the beginning of the day to start it up after that i dont touch the gas again.
hope this helps.
Gary Jacobs talked me through a float level problem today and got me my best et ever with my NSS car. wheels came up so high today, i uncovered my primary jets totally giving me a wicked hesitation with wheels up, car came crashing down till the car leveled out and then picked back right back up.
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: Bob_Coomer]
#448534
08/30/09 08:28 PM
08/30/09 08:28 PM
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Anonymous
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Anonymous
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It is the cheapest insurance that you can have. I use the Wilson valves. But many other setups work fine. Put it on and you know you won't blow the top off your intake... 
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
#448535
08/30/09 08:28 PM
08/30/09 08:28 PM
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Joined: Nov 2003
Posts: 6,293
Rock Springs
Bob_Coomer
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Quote:
Quote:
Quote:
i ran my 440-25 crossram all day today with 7 passes with not 1 backfire.the trick is no gas before firing it up warm.
I agree but that is not how the 2nd intake I had made a big bang. The 2nd one happened when the car was running and I was driving through the pits. I later did find a carb issue that was dumping fuel so in case that ever happens again I have some insurance I can still race that weekend.
Russ
Russ, i understand fully, these intakes are a little tricky at first but once you get the jetting, metering rods, and most importantly the fuel bowls correctly adjusted, fuel psi at no more than 6.5, your golden.
i can understand being gun shy after exploding 2 but really look over your carbs thoroughly before firing it up. just 3 pumps at the beginning of the day to start it up after that i dont touch the gas again.
hope this helps.
Gary Jacobs talked me through a float level problem today and got me my best et ever with my NSS car. wheels came up so high today, i uncovered my primary jets totally giving me a wicked hesitation with wheels up, car came crashing down till the car leveled out and then picked back right back up.
Everyone sometime or another has a needle stick open, its just a matter of time...
Maxx
I was thinking, the way this Cross ram is set up, It would probably need two, cause each side it kinda isolated.. Those Wilson's look trick, but $75 each, and I need two... 
[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: Bob_Coomer]
#448536
08/30/09 09:39 PM
08/30/09 09:39 PM
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Joined: Jan 2003
Posts: 6,354
Aurora, Oh.
max_maniac
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Aurora, Oh.
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Quote:
were can I get one of those at Max? Or do you have two of them?
I have 2 on each intake. I suggest to pm Bob George as he is the one that put those together and installed them. He may be able to send you the parts or tell you where to get them.
Russ
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: Hemi Allstate]
#448539
08/31/09 12:40 PM
08/31/09 12:40 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
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This is the first I've heard about this problem. Sounds like a good idea though. 
 
Ask Russ or Kyle Reasbeck if it's a good idea.Kyle's explosion caused a fire that could have be very serious had he not been prepared with a extinguisher handy.
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: moparphillie]
#448542
08/31/09 02:49 PM
08/31/09 02:49 PM
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Joined: Jan 2003
Posts: 2,763
Walton's Mountain, Pa
Steve1118
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Walton's Mountain, Pa
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That deal with Kyle was a scary, scary, evening. There was a heck of a fire going.....and a garage full of race cars and collector MoPars. It could have been real bad. We had an extinguisher, and there were some guys around. But, if something like that had happened inside an enclosed trailer....it makes my blood run cold.
I think on that deal part of the problem is that the MSD box had gone bad, and caused it to cough up through. Whatever the cause, it was a bad deal. He has the intake working well, now, though, and the car idles and drives as well as your new 300. But, he does have the Wilson sneeze valves on it, now.
Bob could probably answer this better than I, but I think the Indy intake and the old Rat Roaster had the most problems with this. I've heard of it happening with the regular cross ram, but not very often. I think the fact that the new MP crossram has core plugs on each end would be helpful. I think the older ones, especially the Diamond Elkins deals could do it if you weren't careful.
I use the new MP crossram with no issues, but I don't street drive it. It doesn't idle around much, or spend a lot of time where it could load up and cause an incident.
Bob, I'd love to see you put a cross ram on that 65, a set of headlights, and get out there with us. I understand why you are hesitant, but you belong out there with us Geezers. That car has NSS written all over it.
"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 intake Explosions?? !!!Max Maniac!!!
[Re: moparphillie]
#448544
08/31/09 03:38 PM
08/31/09 03:38 PM
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Joined: Mar 2006
Posts: 9,910
Eighty Four, PA
B G Racing
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Quote:
This post is directed to Bob George... Is this potential problem isolated more to the Rat Roaster style of Cross Ram Intake ? The reason for this question is that I just installed a new M/P Cross Ram Intake ( M/P part number p5007534 ) with the two top access panels on my 472 Crate Engine. It will be a street car only. This talk of intake explosions has me concerned enough to look into the Wilson Manifold Pressure Relief Valves. Would it be necessary for this later style of intake ? If I do install two ( 2 ) of these pressure relief valves, where would be the best location on the intake to mount these valves ?
Thank you in advance for your response...
It is not necessarry on the factory X-rams,hemi or wedge that have the expansion/core plugs and the manifolds are more rigid. Large open plenum box style manifolds like Indy and Rat roasters with areas that can puddle fuel are more prone to blow apart.Indy uses the small bolts for just such reason and large open manifolds with no center connecting rib top to bottom with out any attachment bolts are also prone to pop.Letting the top lift causes the attaching bolts and thread bores to break,but the fire after the explosion is what worrys me.Also letting the top "lift" can do a lot of other damage especially if it pulls a fuel line off and the pump feeds the fire.In Kyle's incident the hood was open and the manifold top as well as carbs launched and ended up on the rad support.Only quick thinking and appropate action prevented it from being a disaster.And Russ's in trailer pop could have been the same.That anyones comments that it will or never happen to them doesn' need insurance since they will never have an accident.But to answer the question about the stock factory style including the new MP X-ram,no you don't need the "Snezzer"valve.
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Re: Hemi Cross Ram intake Explosions?? !!!Max Maniac!!!
[Re: mr_340]
#448547
08/31/09 09:12 PM
08/31/09 09:12 PM
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Joined: Dec 2008
Posts: 1,607
KYbywayof WV
Frito
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top fuel
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KYbywayof WV
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I remember the first one I saw was on Teuton's car several years ago. They had it fabricated by Mark Oswald. 
This one?
YEP!!!
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I may have to install a pair of these on my Rat Roaster! 
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