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How close is to close to Carb? #754190 07/21/10 09:03 AM 07/21/10 09:03 AM
Joined: Feb 2003 Posts: 3,456 Out West 4 408strokerdart OP master
408strokerdart OP master 4 Joined: Feb 2003 Posts: 3,456 Out West	I was wondering how close is to close for carb to hood clearance. I have a 1" spacer under my carb and it brings the carb real close to the hood scoop (6 pak type scoop). I was also wondering about the opening size in the scoop for a 417" engine spinning 8200 RPM. So the requirement of the engine is about 500 cu. ft./min of air. Does anyone think the close nature of the carb (1050 dominator) to the hood (about 1 1/2") is a problem? I have been considering going to a different hood scoop to give me more clearance to the carb.

Re: How close is to close to Carb? [Re: 408strokerdart] #754191 07/21/10 09:18 AM 07/21/10 09:18 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	From testing both Chrysler and myself, the top of the carb should be 3/4" below the bottom of the scoop for best performance... if the carb is up in the air flow its causing turbulence plus if its way up in the air flow its making the air go into shear to get into the carb .... if you want to do a cheapo wind tunnel test tape 2"-3" long pieces of yarn to all different places in the scoop and mount a camera to the hood so you can record the action of the stings

Re: How close is to close to Carb? [Re: MR_P_BODY] #754192 07/21/10 10:36 AM 07/21/10 10:36 AM
Joined: Jan 2003 Posts: 4,056 Shelby Twp. Mi HardcoreB master
HardcoreB master Joined: Jan 2003 Posts: 4,056 Shelby Twp. Mi	Quote: ...and mount a camera to the hood so you can record the action of the stings OR...Mount the camera onto your brothers car facing rearward when you run him heads-up. Sorry, I saw it and I took the shot. J/K, I joke. I'm big on the string trick for scoop placement. Mike added valid criteria...below bottom of scoop base.

Re: How close is to close to Carb? [Re: 408strokerdart] #754193 07/21/10 10:36 AM 07/21/10 10:36 AM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	Every time this comes up all I can say is look at the hemi super stockers...............the air horns are damn near touching the scoops and they run pretty good. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: How close is to close to Carb? [Re: MR_P_BODY] #754194 07/21/10 10:36 AM 07/21/10 10:36 AM
Joined: Oct 2009 Posts: 1,288 Oregon sg66mopar pro stock
sg66mopar pro stock Joined: Oct 2009 Posts: 1,288 Oregon	Mr P, I'm guessing you mean 3-4 inches and not 3/4"? Mine's barely at 3" and I've wondered if that's too close.

Re: How close is to close to Carb? [Re: sg66mopar] #754195 07/21/10 10:44 AM 07/21/10 10:44 AM
Joined: Mar 2008 Posts: 5,746 Ontario, Canada Dodgem master
Dodgem master Joined: Mar 2008 Posts: 5,746 Ontario, Canada	I've heard a minimum of 2" (I too have 1") and there is a theory based on throat size I think.

Re: How close is to close to Carb? [Re: sg66mopar] #754196 07/21/10 10:47 AM 07/21/10 10:47 AM
Joined: Jun 2003 Posts: 52,972 Romeo MI MR_P_BODY Master
MR_P_BODY Master Joined: Jun 2003 Posts: 52,972 Romeo MI	Quote: Mr P, I'm guessing you mean 3-4 inches and not 3/4"? Mine's barely at 3" and I've wondered if that's too close. No... I said 3/4" below the BOTTOM of the scoop not the top... by rights they say 3/4" below the bottom of the intake of the scoop Thumper they have rules to follow... look at pro stocks they dont put those scoops on just for kicks... you know are the PS guys are about aerodynamics

Re: How close is to close to Carb? [Re: MR_P_BODY] #754197 07/21/10 10:58 AM 07/21/10 10:58 AM
Joined: Jul 2004 Posts: 19,317 State of confusion T Thumperdart I Live Here
Thumperdart I Live Here T Joined: Jul 2004 Posts: 19,317 State of confusion	Agree about the pro-stocks but the super-stockers are difinately making it work. 72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....

Re: How close is to close to Carb? [Re: MR_P_BODY] #754198 07/21/10 11:10 AM 07/21/10 11:10 AM
Joined: Oct 2009 Posts: 1,288 Oregon sg66mopar pro stock
sg66mopar pro stock Joined: Oct 2009 Posts: 1,288 Oregon	Quote: No... I said 3/4" below the BOTTOM of the scoop not the top... by rights they say 3/4" below the bottom of the intake of the scoop Well, OK then.

Re: How close is to close to Carb? [Re: sg66mopar] #754199 07/21/10 11:47 AM 07/21/10 11:47 AM
Joined: Jul 2010 Posts: 3,502 SOUTH JERSEY HEMIFRED master
HEMIFRED master Joined: Jul 2010 Posts: 3,502 SOUTH JERSEY	I have this old test done by Direct Connection for the snorkle scoops showing desired placement. they had found the previous style didn't work very well and came up with this design.this is the older scoop and lack of anything protruding out from the opening showed very little airflow into it.It might sound weird but I am using this on my Cuda. 6097522-SCOOPFORCUDA.jpg (63 downloads) Last edited by HEMIFRED; 07/21/10 11:49 AM. home of the Sox and Martin Hemi Duster

Re: How close is to close to Carb? [Re: HEMIFRED] #754200 07/21/10 12:46 PM 07/21/10 12:46 PM
Joined: Nov 2004 Posts: 2,119 sc T tjmarcus1 top fuel
tjmarcus1 top fuel T Joined: Nov 2004 Posts: 2,119 sc	i think the real point is this! sometimes you just got to do what you just got to do. like when the motor is set back and up high due to the car being low to ground.

Re: How close is to close to Carb? [Re: tjmarcus1] #754201 07/21/10 01:50 PM 07/21/10 01:50 PM
Joined: Feb 2003 Posts: 3,456 Out West 4 408strokerdart OP master
408strokerdart OP master 4 Joined: Feb 2003 Posts: 3,456 Out West	I will provide more detail. My carb sits pretty high, probably about 1" higher than the bottom of the scoop opening. I have the short 6-pak style AAR hood and my carb is sealed very well to the hood. I have wondered if my scoop is arrowdynamically below the flow of air. My carb is on a 1" HVH spacer that I could remove and try a couple of passes without it? At this point, I just want it to run appropriate times for what it is. Not to concerned if I need another style of scoop, but don't want to do it if there is no gain there.

Re: How close is to close to Carb? [Re: HardcoreB] #754202 07/21/10 01:54 PM 07/21/10 01:54 PM
Joined: Feb 2003 Posts: 3,456 Out West 4 408strokerdart OP master
408strokerdart OP master 4 Joined: Feb 2003 Posts: 3,456 Out West	Quote: Quote: ...and mount a camera to the hood so you can record the action of the stings OR...Mount the camera onto your brothers car facing rearward when you run him heads-up. Sorry, I saw it and I took the shot. J/K, I joke. I'm big on the string trick for scoop placement. Mike added valid criteria...below bottom of scoop base. I think Lonnie will be looking at tail lights even if he is quicker than me Actually, our cars are very well matched as they sit. I am looking to throw another .1 to .2 in the bank though.

Re: How close is to close to Carb? [Re: 408strokerdart] #754203 07/21/10 03:05 PM 07/21/10 03:05 PM
Joined: Jan 2003 Posts: 4,056 Shelby Twp. Mi HardcoreB master
HardcoreB master Joined: Jan 2003 Posts: 4,056 Shelby Twp. Mi	Quote: I have wondered if my scoop is arrowdynamically below the flow of air. Easy schmeezy Japanesee. 6097778-mopardavescoop.bmp (61 downloads)

Re: How close is to close to Carb? [Re: 408strokerdart] #754204 07/21/10 03:09 PM 07/21/10 03:09 PM
Joined: Jan 2003 Posts: 4,056 Shelby Twp. Mi HardcoreB master
HardcoreB master Joined: Jan 2003 Posts: 4,056 Shelby Twp. Mi	Quote: I think Lonnie will be looking at tail lights even if he is quicker than me I know, you know, he knows, he ll we all know it.

Re: How close is to close to Carb? [Re: HardcoreB] #754205 07/21/10 05:28 PM 07/21/10 05:28 PM
Joined: Jan 2003 Posts: 1,412 Johnstown 69dart pro stock
69dart pro stock Joined: Jan 2003 Posts: 1,412 Johnstown	I've been wondering this too since the carb on my roadster is only about 1/2" from the hood without a hood scoop. 33 Plymouth Roadster - 383 - 5.90 1/8th 9.58 1/4 68 Dart - 340 66 Belvedere - 400 Windy Hollow Garage - https://www.youtube.com/@windyhollowgarage

Re: How close is to close to Carb? [Re: HEMIFRED] #754206 07/21/10 07:54 PM 07/21/10 07:54 PM
Joined: Oct 2003 Posts: 1,561 yarnell,az M mopacltd pro stock
mopacltd pro stock M Joined: Oct 2003 Posts: 1,561 yarnell,az	I am looking for one of those windshield snorkle scoops for my Colt. Anyone?

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