Compression question...

Nimitz · 11-20-2005, 03:03 PM

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

**Mr. Luos** · 11-20-2005, 03:32 PM

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

http://www.c5frc.com/calculators/Com...Calculator.htm

Nimitz · 11-20-2005, 04:00 PM

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

**Mr. Luos** · 11-20-2005, 04:06 PM

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

Nimitz · 11-20-2005, 04:12 PM

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

Nimitz · 11-20-2005, 05:23 PM

is that cam to big for a DD car?

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

Chad

**Mr. Luos** · 11-20-2005, 05:53 PM

Might be a little much for a DD.

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

Nimitz · 11-20-2005, 06:07 PM

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

**GatorSS** · 11-20-2005, 06:14 PM

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.

Nimitz · 11-20-2005, 06:35 PM

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

**Hi-Po** · 11-22-2005, 04:21 AM

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$

seriousblack · 12-18-2005, 04:54 PM

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

**MadSeason** · 12-18-2005, 04:59 PM

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

**GatorSS** · 12-19-2005, 10:17 AM

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

seriousblack · 12-19-2005, 11:22 AM

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

**MadSeason** · 12-19-2005, 11:22 AM

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

seriousblack · 12-19-2005, 11:23 AM

and yes I have the same part number SLP Cam you mentioned

**MadSeason** · 12-19-2005, 11:25 AM

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