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Re: Pump Gas Gen 2 Hemis
[Re: DaveRS23]
#2074811
05/16/16 11:11 PM
05/16/16 11:11 PM
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Joined: Dec 2006
Posts: 3,395
Pa
Hot 340
OP
master
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OP
master
Joined: Dec 2006
Posts: 3,395
Pa
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I bought my 540 reciprocating assembly and cam from Ray Barton. He spec'd the CR @ 10.5 for this aluminum headed street/strip motor. I asked him about more comp since I have ran 11:1 in my aluminum headed 499 wedge for years with no problems. He said there wasn't enough additional power for a primarily street driven engine to warrant the extra hassles. Dave, what would be the extra hassle he is reffering to? If you have to get pistons anyway, would cost much more to bump it some i wouldnt think
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Re: Pump Gas Hemis
[Re: Hot 340]
#2074829
05/16/16 11:35 PM
05/16/16 11:35 PM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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What pump gas? Non ethanol? 91 or 93? 11.1 with aluminum heads is about the max in the REAL world IMO. whats your combination? Are you seeing detonation at 11? I ran 11.6:1 in my 484 with no issues for years. I have a 605 hemi now, and I am right around 11.0-11.1:1 with no issues. The Hemi's are very resistant to having issues with detonation. I would be very comfortable running 12:1 on 93 and watching my timing and tune up. What we use around here is E10, so until they get rid of it, that's what I am running mine on. I would not run any lower than 11:1 on pump gas with a hemi. If your building it, build it for 12:1 with .027 head gaskets, and switch to thicker ones if you have to. any trouble with 12:1 on a hot day? That would be my concern. Never had an issue at 11.6 and I drove it a bunch in 90 temps.....You have to remember anything with aluminum heads that heats up loses compression as it gets to temp...The Hemi has a huge combustion chamber....And drops compression a little at temp. Its not really 12:1 at 185 degress anymore.
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Re: Pump Gas Gen 2 Hemis
[Re: Hot 340]
#2075012
05/17/16 11:17 AM
05/17/16 11:17 AM
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Joined: Jan 2003
Posts: 12,011
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,011
Benton, IL.
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I bought my 540 reciprocating assembly and cam from Ray Barton. He spec'd the CR @ 10.5 for this aluminum headed street/strip motor. I asked him about more comp since I have ran 11:1 in my aluminum headed 499 wedge for years with no problems. He said there wasn't enough additional power for a primarily street driven engine to warrant the extra hassles. Dave, what would be the extra hassle he is reffering to? If you have to get pistons anyway, would cost much more to bump it some i wouldnt think I think he was referring to issues with gasoline quality and detonation.
Master, again and still
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Re: Pump Gas Hemis
[Re: ta3834bbl]
#2075075
05/17/16 12:57 PM
05/17/16 12:57 PM
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Joined: Jan 2004
Posts: 4,563
Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,563
Motor City
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Yes, I am very interested in your combo as well. I love to learn new stuff that works. Just finished and dyno'd my 528 with a true 10.5:1 and it almost made 840 hp and 671 TQ. Care to share the combo? Mine is nothing special. Mopar Mega block, 4.500 bore x 4.150 stroke, Mopar Performance heads, with Barton valvetrain, .800 solid roller cam with 4/7 swap. Indy intake.
Last edited by 6PKRTSE; 05/17/16 01:04 PM.
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: Pump Gas Hemis
[Re: 6PKRTSE]
#2078183
05/22/16 12:09 PM
05/22/16 12:09 PM
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Joined: Mar 2003
Posts: 1,629
pa
572charger
top fuel
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top fuel
Joined: Mar 2003
Posts: 1,629
pa
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ive been at 12.2 to one with my 606 cu hemi runs on 93 octane no problems , but the big motors with good heads don't like much timming either that helps out
606 hemi pump gas best 9.60 at 142mph on motor
05 hemi daytona 1500 go-mango 4wd quadcab
2007 hotrod mag pump gas drags runner up, roadkill nights dodge big tire winner 2018 2019 back to back
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Re: Pump Gas Hemis
[Re: 572charger]
#2078188
05/22/16 12:16 PM
05/22/16 12:16 PM
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Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
Dragula
I Live Here
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I Live Here
Joined: May 2004
Posts: 12,383
Taxes & Virus's R-US, NY
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ive been at 12.2 to one with my 606 cu hemi runs on 93 octane no problems , but the big motors with good heads don't like much timming either that helps out Yup 29-30 degrees is what have seen.
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Re: Pump Gas Hemis
[Re: Dragula]
#2078204
05/22/16 12:38 PM
05/22/16 12:38 PM
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Joined: Jan 2003
Posts: 12,011
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,011
Benton, IL.
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ive been at 12.2 to one with my 606 cu hemi runs on 93 octane no problems , but the big motors with good heads don't like much timming either that helps out Yup 29-30 degrees is what have seen. My 10.5 540 liked 30* on the dyno this week.
Master, again and still
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Re: Pump Gas Hemis
[Re: DaveRS23]
#2078852
05/23/16 02:55 PM
05/23/16 02:55 PM
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Joined: Jan 2004
Posts: 4,563
Motor City
6PKRTSE
master
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master
Joined: Jan 2004
Posts: 4,563
Motor City
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Mine liked 33 Degrees best. Lost some power at 32 or less & also lost some at 34+.
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: Pump Gas Hemis
[Re: Hot 340]
#2078861
05/23/16 03:05 PM
05/23/16 03:05 PM
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Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
an8sec70cuda
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 13,354
Marion, South Carolina [><]
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My 572 likes 34°. Atleast it did...I have not changed my base timing in 10 years, lol.
CHIP
'70 hemicuda, 575" Hemi, 727, Dana 60
'69 road runner, 440-6, 18 spline 4 speed, Dana 60
'71 Demon, 340, low gear 904, 8.75
'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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