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compression ratio ? #1133743 12/14/11 12:44 AM 12/14/11 12:44 AM
Joined: Dec 2006 Posts: 61 s.e. michigan top8x7b OP member
top8x7b OP member Joined: Dec 2006 Posts: 61 s.e. michigan	how do you figure compression ratio ? formula? i know what bore size is 4.375 stroke 3.75 deck 9.98 compression height 1.300 piston deck -.008 h/gskt .039 head cc 84 aluminum flat top piston (wiseco) engine is a 451 b engine with stealth heads

Re: compression ratio ? [Re: top8x7b] #1133744 12/14/11 12:58 AM 12/14/11 12:58 AM
Joined: Jan 2003 Posts: 27,421 Balt. Md 3 383man Too Many Posts
383man Too Many Posts 3 Joined: Jan 2003 Posts: 27,421 Balt. Md	Use one of the comp calculators on here. Ron http://www.wallaceracing.com/Calculators.htm

Re: compression ratio ? [Re: top8x7b] #1133745 12/14/11 04:16 AM 12/14/11 04:16 AM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	Quote: how do you figure compression ratio ? formula? i know what bore size is 4.375 stroke 3.75 deck 9.98 compression height 1.300 piston deck -.008 h/gskt .039 head cc 84 aluminum flat top piston (wiseco) engine is a 451 b engine with stealth heads Do the pistons have valve reliefs, if so do you know the CC of them. We need that to get a accurate ratio, we need the bore size of the head gasket also Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: compression ratio ? [Re: Cab_Burge] #1133746 12/14/11 11:19 PM 12/14/11 11:19 PM
Joined: Dec 2006 Posts: 61 s.e. michigan top8x7b OP member
top8x7b OP member Joined: Dec 2006 Posts: 61 s.e. michigan	the pistons have reliefs ,total 10 cc ,the head gskt bore is 4.41

Re: compression ratio ? [Re: top8x7b] #1133747 12/14/11 11:38 PM 12/14/11 11:38 PM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: the pistons have reliefs ,total 10 cc ,the head gskt bore is 4.41 I seriously doubt you have 10 cc valve reliefs in your flat top. Its more then likely 5 cc,s and your just doubleing it. With that said and with a 5 cc figure along with your other info, around a 10 .174 or 10.2 comp.

Re: compression ratio ? [Re: Sport440] #1133748 12/14/11 11:43 PM 12/14/11 11:43 PM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	10.075:1 Fastest 300

Re: compression ratio ? [Re: top8x7b] #1133749 12/15/11 12:18 AM 12/15/11 12:18 AM
Joined: Aug 2003 Posts: 43,228 Bend,OR USA C Cab_Burge I Win
Cab_Burge I Win C Joined: Aug 2003 Posts: 43,228 Bend,OR USA	Quote: the pistons have reliefs ,total 10 cc ,the head gskt bore is 4.41 Unitred Machine(KB)on line calculator says 10.12 to 1 comp. ratio Good, safe pump gas combination Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)

Re: compression ratio ? [Re: Cab_Burge] #1133750 12/15/11 12:23 AM 12/15/11 12:23 AM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Quote: Quote: the pistons have reliefs ,total 10 cc ,the head gskt bore is 4.41 Unitred Machine(KB)on line calculator says 10.12 to 1 comp. ratio Good, safe pump gas combination Yep! Thats what I used, but @ 5cc 10.174 But a 5cc difference should be more then a .05 comp change. I,ll run the numbers again @ 10cc EDIT, Yep, with 10cc Cab, I get 9.74 comp. 84cc head 5cc piston 4.375 bore .008 deck .039 gasket ht. 4.41 gasket diameter 3.75 stroke = 10.174 add 5cc piston for a total of 10 cc = 9.74 comp @ United Machine KB. Last edited by Sport440; 12/15/11 02:40 AM.

Re: compression ratio ? [Re: Sport440] #1133751 12/15/11 12:46 AM 12/15/11 12:46 AM
Joined: Oct 2003 Posts: 7,506 Az Crizila master
Crizila master Joined: Oct 2003 Posts: 7,506 Az	Quote: Quote: the pistons have reliefs ,total 10 cc ,the head gskt bore is 4.41 I seriously doubt you have 10 cc valve reliefs in your flat top. Its more then likely 5 cc,s and your just doubleing it. With that said and with a 5 cc figure along with your other info, around a 10 .174 or 10.2 comp. Could be 10 CC's. 6967688-10cc's.jpg (53 downloads) Fastest 300

Re: compression ratio ? [Re: Crizila] #1133752 12/15/11 01:06 AM 12/15/11 01:06 AM
Joined: Jan 2003 Posts: 6,591 Canton, Ohio S Sport440 master
Sport440 master S Joined: Jan 2003 Posts: 6,591 Canton, Ohio	Crizila, yep those pistons would hit 10 cc or so. Im betting the OP,s pistons arent like that, with 4 sided reliefs.

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