12:0:1 compression...safe?

[allmotorbeasteg6]

how high of a compression do you think is still safe for a daily driven b18c with a built block? im thinking of going 12:0:1 but 11:5:1 sounds alittle safer. although i'll lose some power from the compression, but making a motor last a while is pretty important.

anyone here knows someone thats driving with a 12:0:1 daily and isnt detonation at low end or when starting up the call while its hot?

 

[Bl6CRX]

Originally posted by allmotorbeasteg6@Aug 27 2004, 10:06 PM
how high of a compression do you think is still safe for a daily driven b18c with a built block? im thinking of going 12:0:1 but 11:5:1 sounds alittle safer. although i'll lose some power from the compression, but making a motor last a while is pretty important.

anyone here knows someone thats driving with a 12:0:1 daily and isnt detonation at low end or when starting up the call while its hot?

[post=382949]Quoted post[/post]​

its all about tuning, my buddy runs 12:8:1 on pump gas, 12:0:1 will be fine if tuned properly, I wouldn't go any higher just because it sucks having to retard soo much to get it to run on pump gas...

 

[StyleTEG]

Originally posted by allmotorbeasteg6@Aug 28 2004, 01:06 AM
how high of a compression do you think is still safe for a daily driven b18c with a built block? im thinking of going 12:0:1 but 11:5:1 sounds alittle safer. although i'll lose some power from the compression, but making a motor last a while is pretty important.

anyone here knows someone thats driving with a 12:0:1 daily and isnt detonation at low end or when starting up the call while its hot?

[post=382949]Quoted post[/post]​

Depending on what cams you are using, you might make more power with the 11:5

 

[JDMilan]

I would go with 12.0:1

 

[allmotorbeasteg6]

well im using a b16a head with some jg race cams, so i do have some pretty aggessive cams for the high compression. maybe ill just go with 11:8:1.

 

[StyleTEG]

Originally posted by allmotorbeasteg6@Aug 28 2004, 02:08 PM
well im using a b16a head with some jg race cams, so i do have some pretty aggessive cams for the high compression. maybe ill just go with 11:8:1.

[post=383037]Quoted post[/post]​

Find out the dynamic compresson with those cams, and you find out exactly how much compression will net the most power. Why guess when you can be sure?

 

[MikeBergy]

Originally posted by allmotorbeasteg6@Aug 27 2004, 11:06 PM
how high of a compression do you think is still safe for a daily driven b18c with a built block? im thinking of going 12:0:1 but 11:5:1 sounds alittle safer. although i'll lose some power from the compression, but making a motor last a while is pretty important.

anyone here knows someone thats driving with a 12:0:1 daily and isnt detonation at low end or when starting up the call while its hot?

[post=382949]Quoted post[/post]​

Talk to Cal.

Seriously just make sure you have cams with enough lift and duration to make use of all that compression. There is nothing inherently wrong running 12.xx:1 CR, but if it isn't tuned properly, stuff starts blowing up. The dyno + tuning sessions are your friends.

 

[phunky.buddha]

 

[MikeBergy]

Originally posted by Calesta@Aug 29 2004, 07:52 AM

[post=383246]Quoted post[/post]​

Come to think of it Mike, YOU need cams too.

 

[phunky.buddha]

Yup. I need money before cams though.

 

[integraslut78]

As long as you tune it properly and redo your valve train I say go for 12:1.

 

[B16]

i too need cams... i'm running 12.3:1 on 91 pump gas, with just ctr cams

 

[allmotorbeasteg6]

does your car ping while driving or denate when starting up the car while its hot? btw, what degrees is your timing set at?

 

[phunky.buddha]

Mine? No detonation, base timing at 14 degrees BTDC right now... was at 16 with 2 degrees advance on the intake cam, but we got lazy and put the cam back at zero without reindicating the distributor.