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Compression question...

This is a discussion on Compression question... within the Internal Engine forums, part of the LSx Technical Help Section category; Im going to stay N/A and want to make some good power but still be pretty conservitive (sp). going with ...

  1. #1
    Nimitz
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    Compression question...

    Im going to stay N/A and want to make some good power but still be pretty conservitive (sp). going with a Head/cam package and was wondering what a good CR would be...

    looking into the patriot heads...what will the CR be with these and how much power with that cam?

    Camshaft Included: Yes
    Intake Manifold Included: No
    Fuel Delivery Style: Fuel-injected
    Timing Chain and Gears Included: No
    Lifters Included: No
    Gaskets Included: Yes
    Cylinder Head Style: Assembled
    Cylinder Head Material: Aluminum
    Cylinder Head Finish: Natural
    Combustion Chamber Volume (cc): 59
    CNC Machined Combustion Chamber: Yes
    Combustion Chamber Style: Double quench
    Intake Runner Volume (cc): 225
    Exhaust Runner Volume (cc): 83
    CNC Machined Intake Runner: Yes
    CNC Machined Exhaust Runner: Yes
    Intake Port Location: Standard
    Intake Port Shape: Pent-roof
    Exhaust Port Shape: D-port
    Exhaust Port Location: Standard
    Spark Plug Style: Angle
    Intake Valves Included: Yes
    Intake Valve Diameter (in): 2.02
    Exhaust Valves Included: Yes
    Exhaust Valve Diameter (in): 1.57
    Valve Springs Included: Yes
    Outside Diameter of Outer Spring (in): 1.285
    Damper Spring Included: Yes
    Number of Springs Per Valve: Single
    Retainers Included: Yes
    Retainer Material: Titanium
    Locks Included: Yes
    Lock Style: 7 degree
    Valve Stem Seals Included: Yes
    Valve Stem Seal Style: PC seal
    Valve Stem Seal Material: Teflon
    Rocker Arms Included: Yes
    Rocker Arm Style: Full roller
    Rocker Arm Studs Included: No
    Rocker Arm Nuts Included: Yes
    Guideplates Included: No
    Pushrods Included: No
    Valve Covers Included: No
    Valve Cover Mounting Style: Centerbolt
    Accessory Bolt Holes Drilled: Yes
    Valve Guides Included: Yes
    Valve Guide Material: Manganese bronze intake/Phosphorous bronze exhaust
    Valve Seats Machined: Yes
    Valve Seat Machine Style: 5-angle
    Valve Seat Material: Steel
    Steam Holes Drilled: No
    Oiling Style: Through pushrod
    Machined for O-Ring: No
    Heat Crossover: No
    Cylinder Head Bolts Included: No
    Quantity: Sold as a kit.
    Notes: Camshaft specs are 232/230, .580 in./.578 in., 110 lobe separation angle.



    or should I go with these?

    Cylinder Head Style: Assembled
    Cylinder Head Material: Aluminum
    Cylinder Head Finish: Natural
    Combustion Chamber Volume (cc): 64
    CNC Machined Combustion Chamber: No
    Intake Runner Volume (cc): 225
    Exhaust Runner Volume (cc): 83
    CNC Machined Intake Runner: Yes
    CNC Machined Exhaust Runner: Yes
    Intake Port Location: Standard
    Exhaust Port Location: Standard
    Intake Valves Included: Yes
    Intake Valve Diameter (in): 2.020
    Exhaust Valves Included: Yes
    Exhaust Valve Diameter (in): 1.570
    Valve Springs Included: Yes
    Damper Spring Included: No
    Number of Springs Per Valve: Single
    Retainers Included: Yes
    Retainer Material: Titanium
    Locks Included: Yes
    Lock Style: 10 degree
    Valve Stem Seals Included: Yes
    Valve Stem Seal Style: PC seal
    Rocker Arm Studs Included: No
    Rocker Arms Included: No
    Rocker Arm Nuts Included: No
    Guideplates Included: No
    Accessory Bolt Holes Drilled: Yes
    Valve Guides Included: Yes
    Valve Guide Material: Manganese bronze intake/Phosphorous bronze exhaust
    Valve Seats Machined: Yes
    Valve Seat Machine Style: 5-angle
    Valve Seat Material: Steel
    Steam Holes Drilled: No
    Oiling Style: Through pushrod
    Machined for O-Ring: No
    Heat Crossover: No
    Quantity: Sold as a pair.
    Notes: Head gaskets and bolts are included.


    which heads for a daily driven NA car...the 2nd heads will have a comparable cam... whats the CR with each?

    Thanks

    Chad

  2. #2
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    Not 100% accurate sometimes...but should be great with stock pistons.

    http://www.c5frc.com/calculators/Com...Calculator.htm
    2008 Trailblazer SS
    Yank PTB3600, Kooks 1 7/8" LT's, 4" intake, E-fans, Magnaflow, Sonnax kit, tranny cooler, tune.
    Lowered, HID's, tinted.

    1999 Pontiac Trans Am WS.6 #1747 SOLD
    531.1 RWHP 481.3 FT/Pounds all motor.

  3. #3
    Nimitz
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    Quote Originally Posted by Mr. Luos
    Not 100% accurate sometimes...but should be great with stock pistons.
    sooo... 10:9:1 and 10:3:1 10:9 streetable?

    what kind of power do you think I'd make with that head/cam combo...any reason to NOT go for that combo?

    Chad

  4. #4
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
    2008 Trailblazer SS

    10.9:1 is streetable. Just gotta make sure your tune is spot on.
    Nothing but premium fuel as well, obviously.

  5. #5
    Nimitz
    Guest
    Quote Originally Posted by Mr. Luos
    10.9:1 is streetable. Just gotta make sure your tune is spot on.
    Nothing but premium fuel as well, obviously.
    yeah thats what I figured...

    this should make a beast of a motor...going into a FC3S... (2nd gen rx7)

    Chad

  6. #6
    Nimitz
    Guest
    is that cam to big for a DD car?

    again what are some ideas about power numbers? it'll have headers and exhaust.

    Chad

  7. #7
    Slow'er'Ass Mr. Luos's Avatar
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    Red Tint Jewelcoat
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    Might be a little much for a DD.

    Although everyone's opinion is different when it comes to what can be driven everyday.

  8. #8
    Nimitz
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    Quote Originally Posted by Mr. Luos
    Might be a little much for a DD.

    Although everyone's opinion is different when it comes to what can be driven everyday.
    Thanks....pretty small crowd around it seems. but I appreciate your advice.

    Chad

  9. #9
    We'll be back... GatorSS's Avatar
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    Quote Originally Posted by Nimitz
    is that cam to big for a DD car?

    again what are some ideas about power numbers? it'll have headers and exhaust.

    Chad
    With the right tune, you could tame that thing enough for it to be streetable.

  10. #10
    Nimitz
    Guest
    Camshaft specs are 226/226, .585 in./ .585 in., 112 lobe separation angle.

    I could go with that cam also... quite a bit more mild compared to

    Camshaft specs are 232/230, .580 in./.578 in., 110 lobe separation angle

    Chad
    Last edited by Nimitz; 11-20-2005 at 07:39 PM.

  11. #11
    Veteran Hi-Po's Avatar
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    1999 TA WS.6

    There is a FORSURE way of doing CR. Calls for a little blueprinting , but if you want to know there are specific formulas. I did not check out that site Mr. Luas posted thou.CR= (SV + CV)/CV........ SV- Swept volume .... CV- Compressed volume. I dont know if your trying to get this involed but there is a way to figure out EXACT. Going to need burettes and things of that nature. Just my .02$

  12. #12
    seriousblack
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    What about 11:1 CR For a street head?-I'm considering purchasing Patriot's CNC LS6 Style heads w/above mentioned CR. I have an SLP Cam- 576"/571" LIFT int/Exh w/ 234/232 duration w/ 113 LSA,Also installed Comp Cams Valvetrain upgrade kit complete w/ Pro-Magnum roller rockers -except for lifters-their factory stock-Thanks

  13. #13
    Senior Member MadSeason's Avatar
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    Quote Originally Posted by seriousblack
    What about 11:1 CR For a street head?-I'm considering purchasing Patriot's CNC LS6 Style heads w/above mentioned CR. I have an SLP Cam- 576"/571" LIFT int/Exh w/ 234/232 duration w/ 113 LSA,Also installed Comp Cams Valvetrain upgrade kit complete w/ Pro-Magnum roller rockers -except for lifters-their factory stock-Thanks
    I'm running 11.2:1 on the patriot LS5 heands with 59cc. It's a daily driver and I have the same slp cam if yours is 51013. Very Streetable

  14. #14
    We'll be back... GatorSS's Avatar
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    Light Pewter Metallic
    2000 Camaro SS M6

    What kind of fuel do you run with that 11.2 CR for your daily driving?

  15. #15
    seriousblack
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    Hey Thanks for the info, sounds like I'll be running 11:1s also considering water/methonal shot to super chilll the intake -They work better on Forced induction units but the guys @ www.snowperformance.com (They make a kit designed for GM MAF Systems) say it works well on NA motors-plus safer and cheaper than Nitrious systems-just for your FYI P.S. what are your Flow numbers and valve sizes on your Patriots? Later

  16. #16
    Senior Member MadSeason's Avatar
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    Quote Originally Posted by GatorSS
    What kind of fuel do you run with that 11.2 CR for your daily driving?
    93 Octaine, sometimes it has 10% ethanol in it, thats what it was dyno tuned on so I get no knock

  17. #17
    seriousblack
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    and yes I have the same part number SLP Cam you mentioned

  18. #18
    Senior Member MadSeason's Avatar
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    Quote Originally Posted by seriousblack
    and yes I have the same part number SLP Cam you mentioned
    It's a nice cam for being a few years old. I'm going to take it out and throw it in the camaro and put in a custom cam made for my setup and high compression into the firebird

  19. #19
    seriousblack
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    So what do You think about running a Methanol unit? U sound like you know what your doing? any ideas, check out the website

  20. #20
    seriousblack
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