Re: Clearance oil pickup 4.5 stroke Hemi
[Re: mopar dave]
#3263249
10/10/24 02:03 PM
10/10/24 02:03 PM
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Joined: Jan 2003
Posts: 13,516 Marion, South Carolina [><]
an8sec70cuda
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I Live Here
Joined: Jan 2003
Posts: 13,516
Marion, South Carolina [><]
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I'd be concerned about the tube cracking.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 4 speed, Dana 60 '71 Demon 340, no drivetrain, on blocks behind the barn '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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Re: Clearance oil pickup 4.5 stroke Hemi
[Re: mopar dave]
#3263250
10/10/24 02:03 PM
10/10/24 02:03 PM
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Joined: Jan 2003
Posts: 12,933 Benton, IL.
DaveRS23
Master of nothing...
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Master of nothing...
Joined: Jan 2003
Posts: 12,933
Benton, IL.
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Have you thought about using an Accusump for priming? Since my car can sit for a month at a time, I use one as a primer. Fully oiled before I hit the key. In your case, it would kill two birds with one stone. Priming the pump AND the entire engine.
Just a thought.
Master, again and still
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Re: Clearance oil pickup 4.5 stroke Hemi
[Re: mopar dave]
#3263275
10/10/24 04:42 PM
10/10/24 04:42 PM
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Joined: Jan 2012
Posts: 2,742 Stuttgart, Arkansas
rickseeman
master
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master
Joined: Jan 2012
Posts: 2,742
Stuttgart, Arkansas
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That was my original plan, but with all the reports on losing prime after setting, I decided internal would be better since it will be primarily a street car. I like your original plan better. It is a 4.5" stroke and probably a big powerful motor. Go external like you planned on and quit thinking about losing prime. Hemi's have been using external pickups for over 50 years. Do you know why every Hemi Super Stocker in the country had external 50 years ago? It's because they had big powerful engines (not as powerful as yours) and they wanted it to have good oiling. BMP sells a block-off plate.
2011 Drag Pak Challenger
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Re: Clearance oil pickup 4.5 stroke Hemi
[Re: rickseeman]
#3263280
10/10/24 05:31 PM
10/10/24 05:31 PM
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Joined: Jan 2004
Posts: 8,752 fredericksburg,va
cudaman1969
Itch Nutz
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Itch Nutz
Joined: Jan 2004
Posts: 8,752
fredericksburg,va
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The right pump doesn’t need the block off (no hole in pump body) loop the external line higher behind the pump so there’s always oil laying in it when engine is not running. My first system I made in the early 70s was a static single line that ran behind the deep pan sump, took awhile to prime till I put the line up under header( above pump) instant prime after that. I also used the big Teflon lined line (same size as the rubber line 14?)
Last edited by cudaman1969; 10/10/24 05:35 PM.
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Re: Clearance oil pickup 4.5 stroke Hemi
[Re: rickseeman]
#3263283
10/10/24 05:42 PM
10/10/24 05:42 PM
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Joined: Jan 2003
Posts: 10,141 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
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Frostbitefalls MN (Rocky&Bullw...
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After having another episode of no prime, after custom clearanncing my oil pump to minimum specs, i am thinking of a way to put vacuum draw on the inlet side of the oil pump pickup, right up by the pump. If i could draw oil up by the pump, it should then prime quickly. I have an accusump, and despite a full pre oil, it refused to prime. So if this idea has merit, you might be able to use it on your Hemi. I am tired of pulling the distributor and gear on my motor, as at times it has taken a lot of trys to get the pump gear to go back in. So drilling and tapping a 1/8 pipe plug port , and using a small vacuum pump to pull oil is what i am considering. If my idea works it would save me a lot of messing around. One of those tire deflater things comes to mind, since i have a compresser in my race trailer. My last fail to pull prime was on a cold morning at the track.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Clearance oil pickup 4.5 stroke Hemi
[Re: calrobb2000]
#3263310
10/10/24 09:55 PM
10/10/24 09:55 PM
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Joined: Jan 2004
Posts: 4,649 Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,649
Motor City
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I have heated and dinged the pick up tubes also in the past also. However, I am currently running the dual line external system on the street with no lose of prime issues with a slight loop. Here is the loop in the picture.
1963 Belvedere 440 Max Wedge Tribute 1970 Charger R/T S.E. 440 Six Pack 1970 Challenger R/T, 528 Hemi 1970 Charger 500 S.E. 440 4 BBL 1970 Plymouth Road Runner 383 1974 Chrysler New Yorker 440 1996 2500 RAM 488 V-10 4X4 2004 3500 Dually Cummins 4x4 2012 Challenger R/T Classic.
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Re: Clearance oil pickup 4.5 stroke Hemi
[Re: cudaman1969]
#3263312
10/10/24 10:01 PM
10/10/24 10:01 PM
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Joined: Jan 2003
Posts: 10,141 Frostbitefalls MN (Rocky&Bullw...
gregsdart
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,141
Frostbitefalls MN (Rocky&Bullw...
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Inabiliy to prime comes from the pump clearances hindering the pump to pull oil, the volume of the system, viscosity and temp of oil. At somewhere around 50 degrees temp with 20w50 oil and an external pickup,(big volume from oil to pump in the external line) the pump has to spin a ton of rpm to pull oil, and for more time than you dare run without pressure.
8.582, 160.18 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Clearance oil pickup 4.5 stroke Hemi
[Re: mopar dave]
#3263356
10/11/24 07:13 AM
10/11/24 07:13 AM
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Joined: Jan 2003
Posts: 3,004 A shed in England
Tig
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master
Joined: Jan 2003
Posts: 3,004
A shed in England
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I always used to prime my engine with an electric drill if the car had been standing for any length of time, (it would hold prime for a week or so). It always took a couple of seconds before you could feel the oil pressure load the drill. I switched to a 3 qt Canton accusump when the car started to do big wheelstands and now just use that. I can leave the car for months with the accusump pressurized, pull the release cable and the engine is primed. I've done it whilst under the car, you can hear the oil flooding the engine and draining back to the sump. There is a technique to re-filling the accusump when the engine is started, I shut the accusump off and gently open it to allow the oil to re-fill it, while watching the oil pressure gauge. Fill it too quickly and you can see the oil pressure drop excessively.
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials. 9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge. RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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Re: Clearance oil pickup 4.5 stroke Hemi
[Re: Tig]
#3263359
10/11/24 08:10 AM
10/11/24 08:10 AM
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Joined: Sep 2005
Posts: 634 Deep DEEP SOUTH
LAD 524
mopar
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mopar
Joined: Sep 2005
Posts: 634
Deep DEEP SOUTH
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If the pickup clearance issue and the fragility of the tube has you worried, just go external oilingand run one of these. Granted not the cheapest way but work like a charm. Pre oil your engine before every fire up. Done.
Last edited by LAD 524; 10/11/24 06:38 PM.
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