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Hemi piston compression height question #352444 06/20/09 07:14 AM 06/20/09 07:14 AM
Joined: Jun 2009 Posts: 1,212 QLD Australia Keith Black® OP pro stock
Keith Black® OP pro stock Joined: Jun 2009 Posts: 1,212 QLD Australia	I am building a world products block and will use a 4.500 stroke crank with 7.100 rods, w/4.25 finished bore.. standard deck height 10.725. I need to get custom pistons made (J/E). Does anyone know if the Piston compression height (calculated to be 1.375" puts the pin into the oil ring land ..?.. probems with this scenario...? ... balancing ..? Any help, suggestions or comments appreciated! -------------------------------- Darren Beale Keith Black Racing Engines®

Re: Hemi piston compression height question [Re: Keith Black®] #352445 06/20/09 10:30 AM 06/20/09 10:30 AM
Joined: Mar 2006 Posts: 2,675 Mt. Eden Ky. Hemi Allstate master
Hemi Allstate master Joined: Mar 2006 Posts: 2,675 Mt. Eden Ky.	"Does anyone know if the Piston compression height (calculated to be 1.375" puts the pin into the oil ring land ..?" All I can tell you for sure is, that my 4.50" stroke with 7.100 rods put the pin in the oil ring land and requires a support rail. This is not a problem. Mark 1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019

Re: Hemi piston compression height question [Re: Hemi Allstate] #352446 06/20/09 12:35 PM 06/20/09 12:35 PM
Joined: Jan 2003 Posts: 2,431 USA S SSAAHemiFan top fuel
SSAAHemiFan top fuel S Joined: Jan 2003 Posts: 2,431 USA	4.5 stroke, 7.1 rod, you will need support rails.

Re: Hemi piston compression height question [Re: SSAAHemiFan] #352447 06/20/09 02:44 PM 06/20/09 02:44 PM
Joined: Nov 2003 Posts: 6,293 Rock Springs Bob_Coomer master
Bob_Coomer master Joined: Nov 2003 Posts: 6,293 Rock Springs	Look here is my 572 rod and piston. Yes the wrist pin is in the oil ring. [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: Hemi piston compression height question [Re: Bob_Coomer] #352448 06/20/09 06:59 PM 06/20/09 06:59 PM
Joined: Jun 2009 Posts: 1,212 QLD Australia Keith Black® OP pro stock
Keith Black® OP pro stock Joined: Jun 2009 Posts: 1,212 QLD Australia	Thanks a million for your help! Hoping to get a combo that balances up alright without cutting into rods/pistons/crank. Any thoughts appreciated. J/E Pistons (11:1 w/ 168cc Stage V Heads) + 7.100 parabolic beam Oliver Rods + billet crank (FHO)/or Ohio Crank (still undecided). street motor. -------------------------------- Darren Beale Keith Black Racing Engines®

Re: Hemi piston compression height question [Re: Keith Black®] #352449 06/20/09 11:08 PM 06/20/09 11:08 PM
Joined: Aug 2005 Posts: 760 Southington Ct. T turbobitt super stock
turbobitt super stock T Joined: Aug 2005 Posts: 760 Southington Ct.	I used a 7.0 K1 chevy rod and chevy pin with a 4.5 stroke and the pin clears the bottom ring land. Plenty of people have run with no issues with the support rail but this is another option. Allan G. 1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.

Re: Hemi piston compression height question [Re: turbobitt] #352450 06/21/09 12:43 AM 06/21/09 12:43 AM
Joined: Mar 2006 Posts: 2,675 Mt. Eden Ky. Hemi Allstate master
Hemi Allstate master Joined: Mar 2006 Posts: 2,675 Mt. Eden Ky.	Quote: I used a 7.0 K1 chevy rod and chevy pin with a 4.5 stroke and the pin clears the bottom ring land. Plenty of people have run with no issues with the support rail but this is another option. Allan G. , Hmmmm.......FWIW I am using the K1 4.5 crank with Chevy pin size and K1 7.1 rods. My pistons are CP. I did have to use support rails in my engine. I guess the top ring placement could be moved up, but...... 1996 Ram 1500 Sport 1968 road runner 1952 Sears Allstate licensed, pump gas, Hemi 5.98 @ 115.73 1.33 60 ft. The best is yet to come. Painless Performance / Street RODDER magazine Top 100 for 2019

Re: Hemi piston compression height question [Re: Hemi Allstate] #352451 06/21/09 05:37 PM 06/21/09 05:37 PM
Joined: Aug 2005 Posts: 760 Southington Ct. T turbobitt super stock
turbobitt super stock T Joined: Aug 2005 Posts: 760 Southington Ct.	Quote: Quote: I used a 7.0 K1 chevy rod and chevy pin with a 4.5 stroke and the pin clears the bottom ring land. Plenty of people have run with no issues with the support rail but this is another option. Allan G. , Hmmmm.......FWIW I am using the K1 4.5 crank with Chevy pin size and K1 7.1 rods. My pistons are CP. I did have to use support rails in my engine. I guess the top ring placement could be moved up, but...... I used 4.5 K1 crank but with Diamond pistons. Definetly no support rail with 7" rod. Pistons were spec'ed by Dram. Allan G. 1970 Challenger w/572 Hemi street car and my pride and joy. 1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno. 1976 Cee Bee Avenger Jet Boat - 460 Ford powered.

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