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Author Topic: Compression mild or not.  (Read 2600 times)

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Twism_23

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Compression mild or not.
« on: January 13, 2014, 04:25:44 PM »
Is going to 10.1 or 10.25 static compression on a 110" considered a mild bump or a big adjustment? FWIW, corrected compression would be 9.36 or 9.44. Thanks
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2009 FXSTSSE3, V&H PP, Exile open Primary, 14" Carlini, Danny Grey Shorthop 2 Up XL, HPI 51mm w/4.9 Injectors, Power Vision, AV&V Springs and Valves, Kury TC24D Cams, 10.2 Comp

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grc

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Re: Compression mild or not.
« Reply #1 on: January 13, 2014, 04:32:54 PM »
Quote from: Twism_23 on January 13, 2014, 04:25:44 PM
Is going to 10.1 or 10.25 static compression on a 110" considered a mild bump or a big adjustment? FWIW, corrected compression would be 9.36 or 9.44. Thanks

Depends on the cam timing.  It would be a major bump if you were running the stock 255 cams, and would create a ping monster.  It would be on the low end of acceptable if you installed a cam with a later intake close and some overlap.  Static compression tells only one small part of the story.

Jerry
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hd-dude

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Re: Compression mild or not.
« Reply #2 on: January 13, 2014, 04:34:18 PM »
It is almost a full point up, but not too far in my opinion, depending of course on the cam choice.
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Twism_23

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Re: Compression mild or not.
« Reply #3 on: January 13, 2014, 04:56:16 PM »
Thanks, the cam is why I am asking. I've been told it works best with around 10.25 compression. I don't want to change the compression too much and may have to change my cam choice. @ 10.16 static the corrected compression is 9.36 and CCP is 188 and @10.25 the corrected is 9.44 CCP 191
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2019 FLHXSE FM 128, Wood 22X-E, SE 64mm TB, 5.5 inj., D&D Billet Cat, Aim SDR, Legend  Revo-A, 12” F47, SE Vent. Extreme, SR Comp Ramp, Rekluse Slave

2009 FXSTSSE3, V&H PP, Exile open Primary, 14" Carlini, Danny Grey Shorthop 2 Up XL, HPI 51mm w/4.9 Injectors, Power Vision, AV&V Springs and Valves, Kury TC24D Cams, 10.2 Comp

2017 RGS - FM 124, SE 64mm TB 6.3 inj, Feuling 521, S&S Lifters & Oil pump & Cam plate, AIM SDR, F47 12", D&D Billet Cat,Corbin Classic Solo, 21" Aggressor

hd-dude

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Re: Compression mild or not.
« Reply #4 on: January 13, 2014, 07:46:58 PM »
What cam?
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HILLSIDECYCLE.COM

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Re: Compression mild or not.
« Reply #5 on: January 13, 2014, 08:43:14 PM »
Quote from: Twism_23 on January 13, 2014, 04:56:16 PM
Thanks, the cam is why I am asking. I've been told it works best with around 10.25 compression. I don't want to change the compression too much and may have to change my cam choice. @ 10.16 static the corrected compression is 9.36 and CCP is 188 and @10.25 the corrected is 9.44 CCP 191

No worries at that compression, as an OE 110"/255 cam-equipped engine, hovers at 205-207 ccp straight off the showroom floor.
Scott
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Twism_23

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Re: Compression mild or not.
« Reply #6 on: January 13, 2014, 11:43:18 PM »
Thanks. TW-7H is the cam.
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2019 FLHXSE FM 128, Wood 22X-E, SE 64mm TB, 5.5 inj., D&D Billet Cat, Aim SDR, Legend  Revo-A, 12” F47, SE Vent. Extreme, SR Comp Ramp, Rekluse Slave

2009 FXSTSSE3, V&H PP, Exile open Primary, 14" Carlini, Danny Grey Shorthop 2 Up XL, HPI 51mm w/4.9 Injectors, Power Vision, AV&V Springs and Valves, Kury TC24D Cams, 10.2 Comp

2017 RGS - FM 124, SE 64mm TB 6.3 inj, Feuling 521, S&S Lifters & Oil pump & Cam plate, AIM SDR, F47 12", D&D Billet Cat,Corbin Classic Solo, 21" Aggressor

ob1

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Re: Compression mild or not.
« Reply #7 on: January 14, 2014, 01:07:24 AM »
Should be pretty good down low.
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prodrag1320

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Re: Compression mild or not.
« Reply #8 on: January 14, 2014, 07:58:24 AM »
10.5-1 is what the 7H will want.it`ll work very well,used the cam set a couple of times in 110`s
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Fullsac Performance

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Re: Compression mild or not.
« Reply #9 on: January 14, 2014, 09:52:18 AM »
Quote from: HILLSIDECYCLE.COM on January 13, 2014, 08:43:14 PM
No worries at that compression, as an OE 110"/255 cam-equipped engine, hovers at 205-207 ccp straight off the showroom floor.
Scott
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I have checked them right at that same number. Amazing they don't ping worse than they do.  :nixweiss:

SG
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Twism_23

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Re: Compression mild or not.
« Reply #10 on: January 14, 2014, 10:56:49 AM »
Scott,
Do you thing the 9.35 or 9.44 corrected will ping using 91 octane?
SG,
Are you talking about the 255's pinging?
Thanks
« Last Edit: January 14, 2014, 11:03:46 AM by Twism_23 »
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2019 FLHXSE FM 128, Wood 22X-E, SE 64mm TB, 5.5 inj., D&D Billet Cat, Aim SDR, Legend  Revo-A, 12” F47, SE Vent. Extreme, SR Comp Ramp, Rekluse Slave

2009 FXSTSSE3, V&H PP, Exile open Primary, 14" Carlini, Danny Grey Shorthop 2 Up XL, HPI 51mm w/4.9 Injectors, Power Vision, AV&V Springs and Valves, Kury TC24D Cams, 10.2 Comp

2017 RGS - FM 124, SE 64mm TB 6.3 inj, Feuling 521, S&S Lifters & Oil pump & Cam plate, AIM SDR, F47 12", D&D Billet Cat,Corbin Classic Solo, 21" Aggressor
 

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