Bosting on a 95 mm crank
Thread Starter
Registered User
Joined: Mar 2005
Posts: 14
Likes: 0
Originally Posted by Master Yodub
Combustion chamber volume has nothing to do with rod/stroke ratio, and I don't think you'd need to lower the compression anyways. High compression is fine with boost as long as you have the fuel/tuning to match.
As for the r/s ratio, the lower it is, the more stress you put on the cylinder walls and rotating assembly, the more friction you put on the piston/cyl. wall, and the easier it is for the motor to let go at high rpm.
As for the r/s ratio, the lower it is, the more stress you put on the cylinder walls and rotating assembly, the more friction you put on the piston/cyl. wall, and the easier it is for the motor to let go at high rpm.
if i dont material out my chamer on my GSR, the comp ration would be at 12.1, now 12.1 is not a friend with boost. thats why i to do that for the head.
I
Joined: Jan 2001
Posts: 56,525
Likes: 0
From: Westside til I die
How do you figure 12:1 with 10.1 comp pistons? The difference between the GSR head and LS head isn't THAT different in terms of comp ratio...if that's what you're talking about...and the stroke does raise comp a little bit, but I don't think you'd be 12:1, especially with a super thick HG like .060...double stock thickness.
__________________
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
Thread Starter
Registered User
Joined: Mar 2005
Posts: 14
Likes: 0
Originally Posted by Master Yodub
How do you figure 12:1 with 10.1 comp pistons? The difference between the GSR head and LS head isn't THAT different in terms of comp ratio...if that's what you're talking about...and the stroke does raise comp a little bit, but I don't think you'd be 12:1, especially with a super thick HG like .060...double stock thickness.
the stroker kit from eagle (CRV/VTEC or LSVTEC) was design by eagle for a B16 vtec head ONLY, not for a GSR HEAD and who, said anything about the stroker kit raisesing the comp? piston do that as i know. if you have a LS block mix into a VTEC head IE B16 VTEC head and B18C VTEC head,the comp will chage from head to head, not a huge difference ! but it will change !
I
Joined: Jan 2001
Posts: 56,525
Likes: 0
From: Westside til I die
A longer stroke does slightly raise the compression. The differenct between the GSR and B16/ITR head is not THAT different...you won't even be close to 12:1 if you are indeed using a 10.1 compression piston for a B16 head.
Second, Eagle specifically makes stroker kits for the LS, GSR, ITR for a 95mm stroke. They don't even make a 95mm stroke for the B16.
Third, they even list the compression ratio for the different pistons they supply in their kits, for both the GSR and B16 head on an LSVTEC.
http://www.importperformanceparts.ne...curahonda.html
Second, Eagle specifically makes stroker kits for the LS, GSR, ITR for a 95mm stroke. They don't even make a 95mm stroke for the B16.
Third, they even list the compression ratio for the different pistons they supply in their kits, for both the GSR and B16 head on an LSVTEC.
http://www.importperformanceparts.ne...curahonda.html
__________________
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
Thread Starter
Registered User
Joined: Mar 2005
Posts: 14
Likes: 0
Second, Eagle specifically makes stroker kits for the LS, GSR, ITR for a 95mm stroke. They don't even make a 95mm stroke for the B16.
Third, they even list the compression ratio for the different pistons they supply in their kits, for both the GSR and B16 head on an LSVTEC.
http://www.importperformanceparts.ne...curahonda.html[/QUOTE]
bro, who in the HELL is mentioning a B16 motor or setup here.
maybe you, understoop me wrong here. THE KIT THAT I HAVE IS FOR A B20/B18 BLOCK/VTEC HEAD which EAGLE not Golden EAGLE two different companys, makes the VTEC SPECS OUT OF A B16 HEAD/VTEC.which the comp is set to that B16 standard ONLT. how do i know, because i called and spoked to rich from the tech dept. sorry for the caps , i dont want to be rude.
plus , the comp ration does change !
Yes , they do list the comp ration for every different set up. so whats your point ?
Third, they even list the compression ratio for the different pistons they supply in their kits, for both the GSR and B16 head on an LSVTEC.
http://www.importperformanceparts.ne...curahonda.html[/QUOTE]
bro, who in the HELL is mentioning a B16 motor or setup here.
maybe you, understoop me wrong here. THE KIT THAT I HAVE IS FOR A B20/B18 BLOCK/VTEC HEAD which EAGLE not Golden EAGLE two different companys, makes the VTEC SPECS OUT OF A B16 HEAD/VTEC.which the comp is set to that B16 standard ONLT. how do i know, because i called and spoked to rich from the tech dept. sorry for the caps , i dont want to be rude.
plus , the comp ration does change !
Yes , they do list the comp ration for every different set up. so whats your point ?
I
Joined: Jan 2001
Posts: 56,525
Likes: 0
From: Westside til I die
You mentioned that the setup you have is made for a B16, so I assumed you meant the entire assembly, not just the compression ratio of the pistons...I misunderstood.
I know the comp ratio changes when switching heads, I never said it didn't...all I said, is that if you have a 10.1 compression with using a B16 head, you aren't going to be anywhere NEAR 12:1 with just changing to a GSR head, especially when using a headgasket that is twice the thickness of the stock gasaket. I never mentioned GOLDEN EAGLE once, if you read that link, you'll notice it says EAGLE, and not GE. My point in them listing the compression ratios for both the GSR and B16 head side by side, is that you can clearly see the correct compression ratio. So why don't you figure out the dish/dome CC piston volume, and look it up on that chart. The GSR head is the 41.6CC combustion volume, and the B16 is the 42.7CC volume. You'll want to look in the CRVTEC section, since your motor is bored, and look for the 3.740 stroke, which is 95mm.
I know the comp ratio changes when switching heads, I never said it didn't...all I said, is that if you have a 10.1 compression with using a B16 head, you aren't going to be anywhere NEAR 12:1 with just changing to a GSR head, especially when using a headgasket that is twice the thickness of the stock gasaket. I never mentioned GOLDEN EAGLE once, if you read that link, you'll notice it says EAGLE, and not GE. My point in them listing the compression ratios for both the GSR and B16 head side by side, is that you can clearly see the correct compression ratio. So why don't you figure out the dish/dome CC piston volume, and look it up on that chart. The GSR head is the 41.6CC combustion volume, and the B16 is the 42.7CC volume. You'll want to look in the CRVTEC section, since your motor is bored, and look for the 3.740 stroke, which is 95mm.
__________________
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
Thread Starter
Registered User
Joined: Mar 2005
Posts: 14
Likes: 0
I know the comp ratio changes when switching heads, I never said it didn't...all I said, is that if you have a 10.1 compression with using a B16 head, you aren't going to be anywhere NEAR 12:1 with just changing to a GSR head, especially when using a headgasket that is twice the thickness of the stock gasaket.
if you will look in the first thread i meantion a stocke oem HG, them i mentioned that I was going to switch to a .060 hg ?
if you will look in the first thread i meantion a stocke oem HG, them i mentioned that I was going to switch to a .060 hg ?
I
Joined: Jan 2001
Posts: 56,525
Likes: 0
From: Westside til I die
Originally Posted by reynosop
This is equivalent to running a larger dish on the piston, more volume @ TDC = lower compression ratio, with a .060 HG
Do you know the dish/dome CC volume of the pistons you are getting?
__________________
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
Thread Starter
Registered User
Joined: Mar 2005
Posts: 14
Likes: 0
Originally Posted by Master Yodub
That looks to me like you said you are going to run a .060 HG. An oem 3 layer HG is .029, so you are more than double the oem thickness.
Do you know the dish/dome CC volume of the pistons you are getting?
Do you know the dish/dome CC volume of the pistons you are getting?
i mention on the first thread that i , have a oem HG . from there ,maybe 3 or 4 threads under i mentioned that i was going to get a .060 hg.
I
Joined: Jan 2001
Posts: 56,525
Likes: 0
From: Westside til I die
Well yeah...so are you running one or not?
__________________
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget
2015 Ford Mustang GT Fastback - Ingot Silver - 6M - Performance Package - Gibson Catback, JLT CAI, FR 47lb injectors, BAMA E85 tune, Eibach Sportline, BMR wheel hop kit, UPR oil separator, Steeda shifter bushing/bracket
Team B.O.B.® - Ballaz on a Budget