11:1 too much for 93 Pump Gas?
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11:1 too much for 93 Pump Gas?

  1. #1
    Super Moderator HammerDown's Avatar
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    Question 11:1 too much for 93 Pump Gas?

    Note...depending how my current holes measure I may have to go .070 over on this stroker kit
    In my attempts to acquire as close to 700hp on a single-carb 93-pump gas 496 some have suggested to go 11:1 compression with a aluminum heads. I feel that much compression could make for a narrow tuning range and have detonation concerns however, the engine will be on a dyno for proper tuning ie cruise and wot.
    Heads...AFR 325 or Profiler 320 either to be CNC ported. The reason I'm considering a slightly larger runner is, if I later decide to move these heads over to a larger ci mill >I don't want to spend the $$$ twice on heads. I'm aware I'll have to twist my 496 a little more to make the power but I'm willing to do so.
    Pistons...coated Mahle
    Cam (roller)...I know it's all about the cam!!! HYD or SOLID I'm looking for suggestions or who to speak with to get the 'right' cam the first time!
    Hopefully there's a HP/torque making grind out there that is perfect for my above head/compression considerations yet, won't kill the valve train in short time.
    I would prefer a hyd roller but need to be sure they will be happy visiting 6500 if not, I'll go solid roller. Either way Morel is my choice for roller units.
    Intake...Edelbrock 2907 Victor 454-R intake manifold
    Talk to me about...clearances >I always thought 0025 rods, 003 mains was the norm but now I'm reading 0025 for both...no?
    Piston/cylinder fit...cold block hot piston what's the number?
    Valve/guide clearance... int-exh?
    My Mark 4 block...all 5 existing 2-bolt caps will be reconfigured to accept a second row of 7/16" outboard fasteners. Research tells me this process is good to 850 HP.
    Time is running out...it's time to start building!
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    I'd keep it around 10 to 1 on pump gas. That way you are safe if you get stuck and can't get 93 octane.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    Senior Member Notalent's Avatar
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    Looks like were virtually doing the same build Im shooting for 600-650HP with the Profiler 320's as well. I had Mahle Pistons, but now using the KB Forged #KB789 Pistons since I got a really great deal on them. I will keep you updated as I go...heads should be here this week, still waiting for the rotating assembly. Im using a Hyd Roller and Vaccum was a concern, but now im just saying FOCK it and gettin a vaccum pump Uncertain of the grind as of now...may play with a few...looking around leaning torwards Lunatis #50271 242/252 @50 640/629 lift on a 114LSA
    "Pain is a figment of your Imagination"

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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by cstraub View Post
    I'd keep it around 10 to 1 on pump gas. That way you are safe if you get stuck and can't get 93 octane.
    Even with one of your top secret cam grinds... for heads mentioned?
    1-full point is = to 50hp...no?
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Quote Originally Posted by HammerDown View Post
    Even with one of your top secret cam grinds... for heads mentioned?
    1-full point is = to 50hp...no?
    Turning 6200 to 6400 with the pieces you have listed it should not be a problem making that kind of power on a 10 to 1 engine. . .I've done it before. In the future what gas we can get maybe a good question. I would error to the conservative side.
    Chris Straub
    Straub Technologies

    3HP is an A$$ Whooping!!! JW

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    Senior Member hotbo's Avatar
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    i agree with chris on this 1we have 1 of chris's grinds in my ole mans 505 solid roller.bordix cnc ported bb2 plus heads,matching brodix intake 4500 series with 1050 biggs worked over dominator carb, 10.1 compression.it pulls a a/b-cut ss agressor impeller to 6500 rpm.the thing pulls like a freaking frieght train in the gullwing and runs out really nice

    plus the sound is 1 of the most radical sounding n/a mills ive every been around and ive been around a fewtravis

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    Senior Member Futs's Avatar
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    Quote Originally Posted by cstraub View Post
    Turning 6200 to 6400 with the pieces you have listed it should not be a problem making that kind of power on a 10 to 1 engine. . .I've done it before. In the future what gas we can get maybe a good question. I would error to the conservative side.
    Like Chris said, it can be done. My brothers 496 10.2:1 afr 325 heads with no work and one of Straubs cams made 710 @ 6300 Ran like a raped ape.

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    Senior Member Jim W's Avatar
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    How far would you have to go to get E-85?
    Problem solved.

    Jim
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    Do you guys ever read anything I post, or just go straight for the throat?


    Got it wet on 6/15/10-------->finally......



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    Senior Member Bigblockbill's Avatar
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    I've run a 11:1 motor at 4500 ft elevation on pump gas, but did not trust it at anything lower elevation than that on pump gas. I would stay in the 10:1 range.
    24' Eliminator Fundeck

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    IMO it6 is the edge for iron heads on a NON-thermostat setup motor.

    Aluminum, IMO, you heve about 1 point of cushion.

    Thermostat the motor for MORE heat, and I think it's on the edge for Aluminum, not doable for iron.

    I'd do as Chris says and shave a point for caution and let it live long and healthy.
    You shouldn't loose a tremendous ammount of power, and may just save a tremendous ammount of expensive parts.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    Super Moderator HammerDown's Avatar
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    Quote Originally Posted by SmokinLowriderSS View Post
    IMO it6 is the edge for iron heads on a NON-thermostat setup motor.

    Aluminum, IMO, you heve about 1 point of cushion.

    Thermostat the motor for MORE heat, and I think it's on the edge for Aluminum, not doable for iron.

    I'd do as Chris says and shave a point for caution and let it live long and healthy.
    You shouldn't loose a tremendous ammount of power, and may just save a tremendous ammount of expensive parts.
    Open cooling system w/Rex thermostat w/bypass, I usually see 160 +- 5 degrees.
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

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    Super Moderator HammerDown's Avatar
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    Thumbs up

    Outstanding feedback and as always it's very much appreciated
    I'm always humbled by the knowledgeable people here offering their wisdom and are into making power!

    I was leery about 11:1 in the first place, but kept ears open.

    Interesting conversation... with a AFR rep today.
    Tt was strongly suggested to go with their fully CNC 315's vs my original thoughts for their 325's. I was told their fully CNC'ed 315 could easily be moved over to a larger mill ie-598 and still make strong power in the mid 6k rpm range!
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    Quote Originally Posted by HammerDown View Post
    Even with one of your top secret cam grinds... for heads mentioned?
    1-full point is = to 50hp...no?

    As a base-line one full point is worth 4% power increase +/-.


    650 Hp at 9.5:1 all else being equal you could expect a 26 hp increase bumping the compression to 10.5:1

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    E-7 Sheepdog (ret) SmokinLowriderSS's Avatar
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    Quote Originally Posted by HammerDown View Post
    Open cooling system w/Rex thermostat w/bypass, I usually see 160 +- 5 degrees.
    No thermostat and my toes burried in the carpet, I see 135*.

    Extended idle tops out about 165*

    10* higher when I had the log manifolds with the pre-heaters.
    "As democracy is perfected, the office of president represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."
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    OBAMA: Some people deserve this.
    The rest of us are being dragged along kicking and screaming.

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