Re: What do u guys run for cranking compression
[Re: rook440]
#2451934
02/15/18 12:27 AM
02/15/18 12:27 AM
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Joined: May 2003
Posts: 96,666 On The Boat, On The Lake, Wa. ...
amxautox
Still Retired. Still Posting on Moparts. A Lot.
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Still Retired. Still Posting on Moparts. A Lot.
Joined: May 2003
Posts: 96,666
On The Boat, On The Lake, Wa. ...
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what's the motor set up???
Tom
"Everyone should believe in something; I believe I'll go fishing."
-Henry David Thoreau
Men and fish are alike. They both get into trouble when they open their mouths
author unknown
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Re: What do u guys run for cranking compression
[Re: rook440]
#2451960
02/15/18 01:16 AM
02/15/18 01:16 AM
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Joined: Feb 2003
Posts: 12,675 Columbia, CT
moper
I Live Here
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I Live Here
Joined: Feb 2003
Posts: 12,675
Columbia, CT
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Was the engine blueprinted and the compression ratio calculated via measurement? That's a lot of overlap for hi cranking rpm pressures. Is there a particular reason you're looking for it?
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: What do u guys run for cranking compression
[Re: rook440]
#2451970
02/15/18 01:40 AM
02/15/18 01:40 AM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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what about advancing the cam or even a smaller cam. For more performance is the ign/carb dialed in.
live every 24 hour block of time like it's your last day on earth
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Re: What do u guys run for cranking compression
[Re: rook440]
#2451993
02/15/18 02:31 AM
02/15/18 02:31 AM
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Joined: Sep 2014
Posts: 4,457 Washington
madscientist
master
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master
Joined: Sep 2014
Posts: 4,457
Washington
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Cranking compression doesn't mean jack nothing. Hit your starter with 24 volts and watch the cranking pressure go up. Means nothing.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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Re: What do u guys run for cranking compression
[Re: rook440]
#2452004
02/15/18 03:37 AM
02/15/18 03:37 AM
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Joined: Oct 2007
Posts: 4,210 New York
polyspheric
master
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master
Joined: Oct 2007
Posts: 4,210
New York
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Complete waste of my time, as always.
Boffin Emeritus
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Re: What do u guys run for cranking compression
[Re: BradH]
#2452048
02/15/18 10:26 AM
02/15/18 10:26 AM
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Joined: Feb 2005
Posts: 4,318 Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,318
Prospect, PA
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What type of fuel do you use?
This. If you are using pump gas, you're pretty close now. You won't make 200 w/o using better fuel.
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Re: What do u guys run for cranking compression
[Re: rook440]
#2452121
02/15/18 02:07 PM
02/15/18 02:07 PM
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Joined: Jan 2003
Posts: 31,071 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,071
Oregon
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It's a 60 over440 11.5 compression 67 heads fully ported big valves m1 intake cam is .645 lift intake .650 exhaust 280 at .50 intake 285 at.50 exhaust 106.5 Sep install at 103.5. .020 intake lash.016 exhaust You have 280@050 duration? I'm surprised it even runs with that much duration. My pump gas 470 makes 775 hp and has 264@050 duration so I think your cam is way too big.
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Re: What do u guys run for cranking compression
[Re: rook440]
#2452150
02/15/18 03:02 PM
02/15/18 03:02 PM
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Joined: Oct 2015
Posts: 570 UK
rb446
mopar
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mopar
Joined: Oct 2015
Posts: 570
UK
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Back in the day I ran a stock 440SP motor with the CC.650/290@.050 SFT cam at approx 9.8:1, CP was only around 150psi, not ideal yes but it ran real sweet, ticked over@900rpm but only made 490flyhp on the track, weight/mph, mainly cos of the poor intake/small 850DP carb, not good enough 906's (255cfm) and of course the horrible weight of the bottom end, (2000gms per hole), still managed 10.6's with it....was planning to go to 12.5:1 pistons but it never happened.
Last edited by rb446; 02/15/18 03:12 PM.
1969 'Cuda 446ci, best 9.96@133.9 in 1990 1971 340 'Cuda, best 11.01@122.8 in 1987
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Re: What do u guys run for cranking compression
[Re: rook440]
#2452156
02/15/18 03:13 PM
02/15/18 03:13 PM
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Joined: Jul 2004
Posts: 19,318 State of confusion
Thumperdart
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I Live Here
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State of confusion
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Mines at 160 would like to see it up around 200...whats your opinions..thanks rook 170-175 w/an Isky solid roller 276-281 @ .050 470 cubes and fwiw, a buddy went low 8's a while back w/150...........
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.....
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Re: What do u guys run for cranking compression
[Re: rook440]
#2452180
02/15/18 04:03 PM
02/15/18 04:03 PM
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Joined: Jan 2003
Posts: 19,382 Las Vegas
Al_Alguire
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I Live Here
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Las Vegas
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What Brad said....There is not a magic number. Look for consistency. You would be surprised what we are at for a cranking compression at over 16-1. TO many factors for their to be a perfect answer.
"I am not ashamed to confess I am ignorant of what I do not know."
"It's never wrong to do the right thing"
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Re: What do u guys run for cranking compression
[Re: rook440]
#2452195
02/15/18 04:29 PM
02/15/18 04:29 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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I Live Here
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So. Burlington, Vt.
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280@.050, 11.5cr, and you're getting 160psi?
Sounds about right........ Maybe even a bit more than I would have expected.
My 383 @ just under 11:1, 256@.050 solid cam in at 102 would pump about 200 in 8 pumps, all plugs out, wot, battery charger on, engine warm.
My old 448 @ 9.8cr, 259@.050 roller cam in at 106, would pump about 155-160 in 8 pumps, all plugs out, etc.
I know several of the FAST guys have combos that pump 240-260. Lots of compression and short duration cams.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: What do u guys run for cranking compression
[Re: rook440]
#2452603
02/16/18 03:41 PM
02/16/18 03:41 PM
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Joined: Jan 2005
Posts: 12,423 Kalispell Mt.
HotRodDave
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I Live Here
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Kalispell Mt.
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I run about 220 on my pump gas 410 stroker in my dakota, 11 to 1 221@.050 cam, pulls like mad anywhere between idle and 6000 RPM, a shorter duration cam can bump up the cranking compression as can a bunch of other things like ring seal, engine temp, sterter RPM, valve seat seal...
I am not causing global warming, I am just trying to hold off a impending Ice Age!
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Re: What do u guys run for cranking compression
[Re: HotRodDave]
#2452746
02/16/18 07:56 PM
02/16/18 07:56 PM
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Joined: Jul 2009
Posts: 413 Norway (old world)
Oyvind Mopar
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mopar
Joined: Jul 2009
Posts: 413
Norway (old world)
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I run about 220 on my pump gas 410 stroker in my dakota, 11 to 1 221@.050 cam, pulls like mad anywhere between idle and 6000 RPM, a shorter duration cam can bump up the cranking compression as can a bunch of other things like ring seal, engine temp, sterter RPM, valve seat seal... What sort of heads do you have, ignition timing, and do you run on pump-gas?
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Re: What do u guys run for cranking compression
[Re: rook440]
#2452918
02/17/18 03:08 AM
02/17/18 03:08 AM
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Joined: Oct 2009
Posts: 1,267 North, Alabama
D-50
pro stock
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pro stock
Joined: Oct 2009
Posts: 1,267
North, Alabama
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My small block runs from 195-200 cranking compression with 10.9 comp. and a 255/266 duration cam. I have never ran anything but 93 octane pump gas. It has aluminum heads.
1.33 60 ft,6.21 at 110.59 in the 1/8, pump gas small block,2950lbs,drag radials,mufflers and driven to track ...
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