What will it make, 518 UPDATE
#839958
10/27/10 12:14 AM
10/27/10 12:14 AM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
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Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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I'm getting ready to retest my pump gas 518 C.I. low deck stroker motor, I have tested this motor before with different heads, intakes, camshafts, crankshafts, compression ratio and different dyno brands. The last time I had it on a engine dyno was several years back, I tested it on the Studka dyno that Rodneys now runs , the motor had a set of Eddy RPM CNC ported by MCH that flowed 319 CFM at .600 on Jeffs bench, six pak intake and carbs on OR pump gas. The best pulls resulted in 718 Hp at 5800 RPMs and 744 Ft Lbs at around 4500 to 4800 RPM. I decided to change the heads to a set of Indy 40-1 CNC ported by MCH that flowed right at 370 CFM at .700 lift and a Indy 400-3 intake with a Summit two inch cloverleaf phenolic spacer. I will test four different Holley 1050 Dominators, one 9375HP, two 9375 non HP and one modified early 9375 with annular boosters Rodney was kind enough to test the 9375 annular carb. for me several weeks back so it will be interesting to see which carb. will make the most power Take a guess on HP at what RPM and torque also BTW, the 518 will go back into the Duster this winter , if it survives another test session See the last post by me on this for the updates
Last edited by Cab_Burge; 10/28/10 02:52 AM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What will it make, 518 pump gas low deck
[Re: Cab_Burge]
#839959
10/27/10 12:35 AM
10/27/10 12:35 AM
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Joined: Jul 2010
Posts: 2,091 Delray beach, Florida
Performance Only
top fuel
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top fuel
Joined: Jul 2010
Posts: 2,091
Delray beach, Florida
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couldn't even take a WAG without knowing more about the combo. isn't that stuska dyno the one you found out was about 100 HP happy over a couple other ones you used?
machine shop owner and engine builder
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Re: What will it make, 518 pump gas low deck
[Re: Performance Only]
#839960
10/27/10 01:04 AM
10/27/10 01:04 AM
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Joined: Aug 2003
Posts: 43,157 Bend,OR USA
Cab_Burge
OP
I Win
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OP
I Win
Joined: Aug 2003
Posts: 43,157
Bend,OR USA
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Quote:
couldn't even take a WAG without knowing more about the combo. isn't that stuska dyno the one you found out was about 100 HP happy over a couple other ones you used?
I will provide what I forgot The other dyno operator(before Rodney) insisted that he calibrated it before every dnyo session each day I'm taking this motor back to the DTS which is at 4100 Ft above sea level, the Studka is at 2500 FT ASL. I forgot to mention on the first post that I'm using the same cam and lifters as before, Comp Cams solid roller with 260 @.050 intake with .420 lobe lift, 266 @.050 exhaust with .409 lobe lift. Harland Sharp 1.6 rockers(check to be right 1.64 actual net ratio at the retainers Manton 3/8 .145 wall thickness Stage 3 pushrods, PAC valve springs with around 50 lbs more seat and opend pressures than before, was 250 to 260 lbs seat, now 325 lbs on the seats, was 650 to 660 lbs opened, now 720 to 730 lbs open with Comp Cams 10 degree tool steel retainers and locks.The Eddy heads had Comp Cams Titianum 10 degree reatiners and keepers. The 440-1 heads have 8 cc smaller chambers so the new compression ratio is now 10.84 to 1 versus 10.29 to 1 before. Enjoy I'll post the results tomorrow evening, time permitting and the creek don't rise
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: What will it make, 518 pump gas low deck
[Re: Cab_Burge]
#839967
10/27/10 10:05 AM
10/27/10 10:05 AM
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Joined: Jan 2003
Posts: 9,875 Weddington, N.C.
Streetwize
master
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master
Joined: Jan 2003
Posts: 9,875
Weddington, N.C.
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My guess is around 785hp on a conservative dyno (so about 860 on 'happy' one ) I'm real curious to see the results, sounds like your heads are about on par with my Chapmans, I know you've got more Cam and the big single but still it ought to give me the most apples to apples since we've got near identical short blocks/cubes/heads...I've got 12:1 and looking at your spec really the cams are fairly close (264/268 @.050 HR .600/592 lift w 1/6's) too. What do the heads flow at .450 and at your peak lift? Those 2 lifts always seem to zero in on what these motors will make. for comparison mine did right at 310 @ .450 and 362 @ .600. It's not a ton of compression for a big port -1 with the big Indy intake, torque may take a little hit initially which I've seen can have an effect on the whole (momentum) curve on a dyno pull. I kick myself for not dynoing mine, It was meant to have a big solid roller and Dommy/-3 and be set in an A-body race car like yours....it kind of wound-up slightly de-tuned and in the Charger after one too many 'barley pops' Is your block Girdled? mine's not that's why I didn't take it to the full limit of my heads potential.
Last edited by Streetwize; 10/27/10 11:12 AM.
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Re: What will it make, 518 pump gas low deck
[Re: Cab_Burge]
#839968
10/27/10 10:22 AM
10/27/10 10:22 AM
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Joined: Jan 2003
Posts: 16,925 NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,925
NC
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Quote:
I tested it on the Studka dyno that Rodneys now runs , the motor had a set of Eddy RPM CNC ported by MCH that flowed 319 CFM at .600 on Jeffs bench, six pak intake and carbs on OR pump gas. The best pulls resulted in 718 Hp at 5800 RPMs and 744 Ft Lbs at around 4500 to 4800 RPM.
I decided to change the heads to a set of Indy 40-1 CNC ported by MCH that flowed right at 370 CFM at .700 lift and a Indy 400-3 intake with a Summit two inch cloverleaf phenolic spacer.
Comp Cams solid roller with 260 @.050 intake with .420 lobe lift, 266 @.050 exhaust with .409 lobe lift. Harland Sharp 1.6 rockers The 440-1 heads have 8 cc smaller chambers so the new compression ratio is now 10.84 to 1 versus 10.29 to 1 before
I think the head/intake change will give big results.
Guess +80 hp. But on a different dyno, all bets are off.
What header specs?
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Re: What will it make, 518 pump gas low deck
[Re: RAMM]
#839976
10/27/10 02:04 PM
10/27/10 02:04 PM
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Joined: Feb 2008
Posts: 2,648 GA
Boosted
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master
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Posts: 2,648
GA
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720ish hp... The heads flow more but at more lift... If you went with a taller cam then I can see that you are going to get th emost out of those heads...
2011 RAM3500
1967 Fastback Barracuda with some go fast goodies.
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