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Compression Help?? #1408716 03/25/13 05:00 PM 03/25/13 05:00 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer OP master
Bob_Coomer OP master Joined: Nov 2003 Posts: 6,293 Rock Springs	I dont have a calculator any longer, and I checked a couple onlines.. and got 20:1 with one and 7:1 with another LOL... So 4.375 bore 4.15 stroke pistons are large relief B1's with Id say 10-12cc range aluminum rod engine, pistons are .030 in the hole use a gasket in the .032-.035 range with a 4.44-4.5 bore size.. Heads are 53cc Holy cow... yep.... Just ball park Im going to give it the ole gray matter guess and say 13.75-14:1+ I hope Im not leaving something out... [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

Re: Compression Help?? [Re: Bob_Coomer] #1408717 03/25/13 05:06 PM 03/25/13 05:06 PM
Joined: Nov 2004 Posts: 2,495 Oregon City, OR Baxter61 top fuel
Baxter61 top fuel Joined: Nov 2004 Posts: 2,495 Oregon City, OR	With everything on the big end (12cc reliefs, 4.500 bore gasket at .035) I come up with 13.54 and 14.02 with everything listed on the low end (10cc, 4.440 at .032)

Re: Compression Help?? [Re: Bob_Coomer] #1408718 03/25/13 05:13 PM 03/25/13 05:13 PM
Joined: Oct 2006 Posts: 596 Mass. 8 80fbody mopar
80fbody mopar 8 Joined: Oct 2006 Posts: 596 Mass.	Summit has a pretty simple one I've been using lately. Not too fancy. http://www.summitracing.com/expertadviceandnews/calcsandtools/compression-calculator

Re: Compression Help?? [Re: Baxter61] #1408719 03/25/13 05:15 PM 03/25/13 05:15 PM
Joined: Jun 2003 Posts: 9,225 Charleston S sixpackgut Drag Week Mod Champion
sixpackgut Drag Week Mod Champion S Joined: Jun 2003 Posts: 9,225 Charleston	13.43 Gen 3 power 6.22@110, 9.85@135 Follow @g3hemiswap on instagram performance only racing, CRT, ultimate converter, superior design concepts, ThumperCarbs

Re: Compression Help?? [Re: sixpackgut] #1408720 03/25/13 10:02 PM 03/25/13 10:02 PM
Joined: Aug 2009 Posts: 456 corpus christi tex C Cheatham mopar
Cheatham mopar C Joined: Aug 2009 Posts: 456 corpus christi tex	are the pistons below the deck if so how much? and dont forget the area above the top ring

Re: Compression Help?? [Re: Cheatham] #1408721 03/25/13 10:50 PM 03/25/13 10:50 PM
Joined: Jun 2004 Posts: 6,780 Alabama Mopar-Al master
Mopar-Al master Joined: Jun 2004 Posts: 6,780 Alabama	Quote: are the pistons below the deck if so how much? and dont forget the area above the top ring Says .030 if you read his post

Re: Compression Help?? [Re: Mopar-Al] #1408722 03/26/13 12:30 PM 03/26/13 12:30 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer OP master
Bob_Coomer OP master Joined: Nov 2003 Posts: 6,293 Rock Springs	Thanks guys Yep, its a aluminum rod engine, the pistons are .030 in the hole.... try to get this beast running. [color:"red"]65 Hemi Belvedere coming soon [/color] [color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]

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