|
Author
|
Topic: can I run 10.5:1 compression???????
|
19falcon66
¯
Member # 2433
|
posted
 
 
Hey I was wondering if I can run 10.5:1 compression and still use pump gas not realy shure what to think I was told i could but I thought I would ask around and see hat other people think.
"Wonder if heavens got a ghetto and a drag strip"
Posts: 13 | From: Livermore california | Registered: Feb 2003
| :
|
|
93mustangt
¯
Member # 680
|
posted
Yes you can but you need aluminum heads.
Posts: 543 | From: Orange county, Ca | Registered: Dec 2001
| :
|
|
NvrGoFullRetard
CAFords OG
Member # 1633
|
posted
why would u need aluminum heads i had 11.1 on a old chevy set up with iron heads
and yes u could run 10.5:1 on pump gas i have 10.5:1 on my new motor and im going to run 91 octane for it
just dont plan on supercharging it
--------------------
"formally 4.6 eatin gm's"
white 97gt n/a 320rwhp/325rwtq
01 sierra rcsb lsx 408 (murdered out)
03 ecsb sierra 6.0 on 22's
2011 Tahoe
Posts: 2759 | From: PITTSBURG/FAIRFIELD | Registered: Aug 2002
| :
|
|
19falcon66
¯
Member # 2433
|
posted
i'm not going to supercharge it i am going to be runnong li ke 150 shot of nitrous and i will be using aluminum heads since it will be cheaper since i got a brand new short block.
Posts: 13 | From: Livermore california | Registered: Feb 2003
| :
|
|
NvrGoFullRetard
CAFords OG
Member # 1633
|
posted
u shouldnt have no problems then ![[Big Grin]](biggrin.gif)
--------------------
"formally 4.6 eatin gm's"
white 97gt n/a 320rwhp/325rwtq
01 sierra rcsb lsx 408 (murdered out)
03 ecsb sierra 6.0 on 22's
2011 Tahoe
Posts: 2759 | From: PITTSBURG/FAIRFIELD | Registered: Aug 2002
| :
|
|
93mustangt
¯
Member # 680
|
posted
Oh i thought that with that compression you would have to run aluminum heads i guess not.So if i were to rebuild my motor i could run 10.5/1 without any worry of it pinging?Would i still be able to run the same timing?
Posts: 543 | From: Orange county, Ca | Registered: Dec 2001
| :
|
|
Chris M.
Ignore me, all I do is argue online!
Member # 1708
|
posted
if your car has computer controled timing then you can run a bit more compression than you can with a mechanical dist.
Posts: 2828 | From: West Bay, CA | Registered: Aug 2002
| :
|
|
93PONY
Mr. Valve Events
Member # 60
|
posted
IMO it really depends on the cam.
You can build a 11 to 1 compression motor that runs on pump gas if the cam is small enough. & you run into detonation on 9.5 to 1 motors with a good cam...
Compression ratio means very little. Cylinder pressure is what matters.
--------------------
www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4266 | From: Fair Oaks, CA | Registered: Nov 2000
| :
|
|
Stimson
_
Member # 51
|
posted
quote:
Originally posted by 93mustangt:
Oh i thought that with that compression you would have to run aluminum heads i guess not.So if i were to rebuild my motor i could run 10.5/1 without any worry of it pinging?Would i still be able to run the same timing?
Aluminum heads "effectively" lower the compression ratio by drawing heat away from the combustion chamber. For example, a 8.8:1 iron headed motor would "act" like a 8.0:1 motor if the iron heads were replaced with identical aluminum castings.
93PONY- can you spec me a cam to fix my leaky power steering rack? Its getting kinda annoying.
Posts: 2373 | Registered: Jun 2000
| :
|
|
93PONY
Mr. Valve Events
Member # 60
|
posted
quote:
Originally posted by st5150:
quote:
Originally posted by 93mustangt:
Oh i thought that with that compression you would have to run aluminum heads i guess not.So if i were to rebuild my motor i could run 10.5/1 without any worry of it pinging?Would i still be able to run the same timing?
Aluminum heads "effectively" lower the compression ratio by drawing heat away from the combustion chamber. For example, a 8.8:1 iron headed motor would "act" like a 8.0:1 motor if the iron heads were replaced with identical aluminum castings.
93PONY- can you spec me a cam to fix my leaky power steering rack? Its getting kinda annoying.
Actually, Aluminum heads disipate heat faster & allow you to run more cylinder pressure on a given octane....it does not lower your compression....
No cam for you! ![[Razz]](tongue.gif)
--------------------
www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4266 | From: Fair Oaks, CA | Registered: Nov 2000
| :
|
|
Stimson
_
Member # 51
|
posted
Which is why I said ""effectively"" and ""act"" in my post. Read what I wrote again and let me know if I wasn't clear on something because once again you just said what I said, but in a different way ![[burnout]](graemlins/burnout.gif)
Posts: 2373 | Registered: Jun 2000
| :
|
|
93PONY
Mr. Valve Events
Member # 60
|
posted
Nah. It's all about cylinder pressure....not compression. 2 different things....related, but no the same. ![[Wink]](wink.gif)
However in this instance, we are both saying you can run more.....cylinder pressure with aluminum heads given the same octane.
--------------------
www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4266 | From: Fair Oaks, CA | Registered: Nov 2000
| :
|
|
Stimson
_
Member # 51
|
posted
I never said cyl pressure and compression were the same thing
![[Whoo Whooooo!]](graemlins/woowoo.gif)
Posts: 2373 | Registered: Jun 2000
| :
|
|
Gear Head
JARED
Member # 779
|
posted
You guys are like two little kids fighting for who gets the credit.
--------------------
Support our troops!
Posts: 5685 | From: EASTBAY | Registered: Jan 2002
| :
|
|
Stimson
_
Member # 51
|
posted
![[worship]](graemlins/worship.gif) Obviously the guy who has a twin turbo cobra won the credit card fight and not the guy with the stock LX ![[dance]](graemlins/dance.gif)
Posts: 2373 | Registered: Jun 2000
| :
|
|
93PONY
Mr. Valve Events
Member # 60
|
posted
quote:
Originally posted by st5150:
Obviously the guy who has a twin turbo cobra won the credit card fight and not the guy with the stock LX
That guy always wins.... Although he doesn't have any parts on the credit card.
--------------------
www.advancedenginedevelopment.com
SCT dealer
Dynotuning
(916)715-7569
Posts: 4266 | From: Fair Oaks, CA | Registered: Nov 2000
| :
|
|
mustanggt5091
All I need is.....
Member # 444
|
posted
You shouldnt have any problems. I run 11.1:1 compression on my car ( with aluminum heads ) and can still run 89 octane without knocking and pinging. I run a fuel injected motor so It may be a little different. I can tell you my brothers chevy 400 has 10.25:1 compression and runs fine with 91!
--------------------
88 GT 357w (SOLD):(
06 Limited Edition R6 !!!!!
Posts: 2353 | From: Fairfield / Santa Rosa , Ca | Registered: Sep 2001
| :
|
|
Email this post to someone!
Printer friendly view of this Ford topic
