Compression ratio and HOT weather
#1
Teching In
Thread Starter
Join Date: Dec 2003
Location: Gilbert, AZ
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Compression ratio and HOT weather
Do you guys think 11:1 is too much for Arizona(we have 91 octane gas and 110F summer days are common)? I'm about to buy some AS 5.3's and I'm deciding on the compression ratio to go with. I know the LS6 runs 10.5:1 with no problems, and Jay told me he could go as low as 10.8:1 with the 5.3's. I'd like to run 11:1, just wanted to see what you guys thought. Thanks.
#2
LSX Mechanic
iTrader: (89)
It will GREATLY depend on your tune how much compression you can run. Being in AZ and only using 91 octane, I would go on the safe side and run 10.8:1. The difference wouldn't even be 5 HP between that and 11:1, and it'd be worth the security. Not really worth it when you take a step back and realize it'd only be a couple more HP and more risk of detonation....JMO
josh
josh
#3
TECH Fanatic
Join Date: Jun 2003
Location: Further South than Hell
Posts: 1,070
Likes: 0
Received 0 Likes
on
0 Posts
It depends hot and dry or hot and humid?? The higher the humidity the less chance of detonation (Kinda like a water injection. Also depends on your timing.
#4
Teching In
Thread Starter
Join Date: Dec 2003
Location: Gilbert, AZ
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Damian
Thanks for the information Josh; this is exactly what I was looking for. As you can see from my choice of cam(TR220), I'm not looking to set any hp records, just to have a dependable daily driver with same extra teeth. Looks like the 10.8:1 is gonna be my choice. It was tuned after the cam install and will be tuned again after the heads go on. The shop is local(Xtreme Motorsports) and they understand I'm not looking to push the envelope with the tune.
4thGENRETARD
I'm in Arizona so it would be seriously dry , thanks.
Thanks for the information Josh; this is exactly what I was looking for. As you can see from my choice of cam(TR220), I'm not looking to set any hp records, just to have a dependable daily driver with same extra teeth. Looks like the 10.8:1 is gonna be my choice. It was tuned after the cam install and will be tuned again after the heads go on. The shop is local(Xtreme Motorsports) and they understand I'm not looking to push the envelope with the tune.
4thGENRETARD
I'm in Arizona so it would be seriously dry , thanks.
#7
TECH Veteran
iTrader: (6)
I have been running 11.1:1 CR for the past year without any problems. I would run a gallon or two of 100 unleaded (in a full tank of 91) durring the summer if I was going to go out "hunting" on Bell but other than that I just ran straight 91. One guy I know is running 11.2:1 and another had 10.8:1.
AZ isn't that big of a deal 90% of the year if you have the car set up to run cool (colder T-stat, fans set lower, etc...). The only real time I had problems was August (and thats a no duhhh).
AZ isn't that big of a deal 90% of the year if you have the car set up to run cool (colder T-stat, fans set lower, etc...). The only real time I had problems was August (and thats a no duhhh).
Trending Topics
#8
Teching In
Thread Starter
Join Date: Dec 2003
Location: Gilbert, AZ
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by JZ'sTA
Id move.......
J/KI live in some shatty weather myself during the summer.
However we do have 93 octane at every gas station.
J/KI live in some shatty weather myself during the summer.
However we do have 93 octane at every gas station.
2001CamaroGuy
We have to run Sunoco 110 in my son's goped(15:1 comp) and I usualy buy it 5gal at a time so it would be easy enough to buy extra to mix with the 91 during the hottest months. I do run a 178 stat, redline water wetter, and the fans are set to come on at 194 and 204.
Thanks to all for your input, I ordered the AS stg2 5.3’s today.
#9
TECH Veteran
iTrader: (6)
Originally Posted by blownC6
LOL, I remember one summer about 15 years ago or so, it got up to 122(no BS) that would have been the summer to move.
2001CamaroGuy
We have to run Sunoco 110 in my son's goped(15:1 comp) and I usualy buy it 5gal at a time so it would be easy enough to buy extra to mix with the 91 during the hottest months. I do run a 178 stat, redline water wetter, and the fans are set to come on at 194 and 204.
Thanks to all for your input, I ordered the AS stg2 5.3’s today.
2001CamaroGuy
We have to run Sunoco 110 in my son's goped(15:1 comp) and I usualy buy it 5gal at a time so it would be easy enough to buy extra to mix with the 91 during the hottest months. I do run a 178 stat, redline water wetter, and the fans are set to come on at 194 and 204.
Thanks to all for your input, I ordered the AS stg2 5.3’s today.
#11
TECH Fanatic
Join Date: Jun 2003
Location: Further South than Hell
Posts: 1,070
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 2001CamaroGuy
I run straight distilled water and water wetter (no need for the "anti-freeze" out here ) and have my fans set to come on about 170 and 180.
#12
TECH Veteran
iTrader: (6)
Originally Posted by 4thGENRETARD
Antifreeze is also a coolant in the Summer. you would get better results with a 50/50 mix and water wetter.
I started doing this and the car runs cooler than it did with 50/50 and water wetter
#13
Teching In
Thread Starter
Join Date: Dec 2003
Location: Gilbert, AZ
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
Originally Posted by 2001CamaroGuy
it says right on the bottle "for better cooling in non-freezing environments, run straight water and water wetter"
I started doing this and the car runs cooler than it did with 50/50 and water wetter
I started doing this and the car runs cooler than it did with 50/50 and water wetter
Here's a link to Redline's tech data on Water Wetter, interesting reading. http://www.redlineoil.com/redlineoil/wwti.htm
#14
TECH Junkie
Join Date: Jan 2002
Location: At the office
Posts: 3,015
Likes: 0
Received 0 Likes
on
0 Posts
10.8:1 here and 91 Octane....I run a bigger cam though which helps bleed off some of the compression so I don't have to worry as much. WOT all day long when its 115 degrees and no problem
I personally wouldn't run 11:1, but if I did I'd mix a little 100+ octane gas like 2001CamaroGuy said.
I'd also recommend an EWP.
I personally wouldn't run 11:1, but if I did I'd mix a little 100+ octane gas like 2001CamaroGuy said.
I'd also recommend an EWP.