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Re: A new year
[Re: jlatessa]
#2888029
02/14/21 10:27 AM
02/14/21 10:27 AM
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Joined: Feb 2021
Posts: 70
Souderton
Taylor
member
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member
Joined: Feb 2021
Posts: 70
Souderton
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For those of us not to the level of knowledge many of you are:
What do the Rpk, Rk and Rvk values represent?
Thanks, Joe Honing Terms Rpk =Peak roughness Rk =Core roughness Rvk =Valley roughness found below the core roughness
04 Ram 4x2 11.66@ 122 4750LBS ...phat pig Moves for fully loaded truck with NA 345ci Hemi
2020 1320 Challenger....stock daily driver.
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Re: A new year
[Re: Alan Prusiensky]
#2888038
02/14/21 10:43 AM
02/14/21 10:43 AM
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Joined: Feb 2021
Posts: 70
Souderton
Taylor
member
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member
Joined: Feb 2021
Posts: 70
Souderton
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I some reason that isn't what the Hemi wants. I have a idea why the charge doesn't swirl when it enters the chamber with a flat piston it tumbles. What is so crazy I have taken apart a lot of pro stock engines built by a lot of smart people and what I have found they all have pretty flat pistons. If I make my piston flat with the exact same compression my motor will be done 75hp. [quote=Alan Prusiensky]Piston shape and hone was the most return I have found. Alan, I think it has to do with the Hemi99 valves being more of a true cross flow nature head, While the DRCE heads are closer to being "side by side"
04 Ram 4x2 11.66@ 122 4750LBS ...phat pig Moves for fully loaded truck with NA 345ci Hemi
2020 1320 Challenger....stock daily driver.
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Re: A new year
[Re: Taylor]
#2888488
02/14/21 11:21 PM
02/14/21 11:21 PM
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Joined: Aug 2009
Posts: 1,324
Ohio
jlatessa
pro stock
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pro stock
Joined: Aug 2009
Posts: 1,324
Ohio
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Re: A new year
[Re: Taylor]
#2888541
02/15/21 07:53 AM
02/15/21 07:53 AM
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Joined: Aug 2005
Posts: 4,118
Yes
sixpakdodge
master
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master
Joined: Aug 2005
Posts: 4,118
Yes
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I some reason that isn't what the Hemi wants. I have a idea why the charge doesn't swirl when it enters the chamber with a flat piston it tumbles. What is so crazy I have taken apart a lot of pro stock engines built by a lot of smart people and what I have found they all have pretty flat pistons. If I make my piston flat with the exact same compression my motor will be done 75hp. [quote=Alan Prusiensky]Piston shape and hone was the most return I have found. Alan, I think it has to do with the Hemi99 valves being more of a true cross flow nature head, While the DRCE heads are closer to being "side by side" The Hemi 99 and DRCE valve layout/chamber design is quite similar. No one uses a "side by side" or Gen 1/2 Hemi style "cross flow" chamber design, everything is canted.
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Re: A new year
[Re: sixpakdodge]
#2888848
02/15/21 04:45 PM
02/15/21 04:45 PM
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Joined: Feb 2021
Posts: 70
Souderton
Taylor
member
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member
Joined: Feb 2021
Posts: 70
Souderton
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I some reason that isn't what the Hemi wants. I have a idea why the charge doesn't swirl when it enters the chamber with a flat piston it tumbles. What is so crazy I have taken apart a lot of pro stock engines built by a lot of smart people and what I have found they all have pretty flat pistons. If I make my piston flat with the exact same compression my motor will be done 75hp. [quote=Alan Prusiensky]Piston shape and hone was the most return I have found. Alan, I think it has to do with the Hemi99 valves being more of a true cross flow nature head, While the DRCE heads are closer to being "side by side" The Hemi 99 and DRCE valve layout/chamber design is quite similar. No one uses a "side by side" or Gen 1/2 Hemi style "cross flow" chamber design, everything is canted. I understand they are not side by side like a traditional wedge but in a canted position , but the Hemi 99 is closer to being a cross flow then the DRCE head, the DRCE heads are more of a a 10/4 o'clock while the 99's are closer to a 11/5 o'clock
04 Ram 4x2 11.66@ 122 4750LBS ...phat pig Moves for fully loaded truck with NA 345ci Hemi
2020 1320 Challenger....stock daily driver.
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Re: A new year
[Re: tomkelly]
#2895960
03/05/21 09:07 AM
03/05/21 09:07 AM
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Joined: Aug 2003
Posts: 5,041
new jersey usa
11secdart
master
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master
Joined: Aug 2003
Posts: 5,041
new jersey usa
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Good Luck Alan and team!!!
68 Dart 410 / 904
92 D150 original owner
21 Ram 1500 Quad Cab, Big Horn , Hemi ,4x4
23 Audi Q5
16 Honda HRV
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