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22crazy · 12-25-2002, 02:01 PM

what up. Ive been searching the net and asking people but nobody has been able to answer my question. I wouldnt mind building a crazy NA motor but the problem i face is compression vs octane. I no if someone wants to build a NA motor u need high compression, but the problem is that the higher compression u go, the higher octane u need to go. My problem is that in my area the highest octane u can buy at a pump is 94...i can buy octane boosters, but i dont want to buy a booster everytime i go to the pump. Does anyone no whats the highest compression u can have inside your engine using 94 octane before the gas spontaneously explodes because of compression

instead of spark. Thanx

92b16vx · 12-25-2002, 02:09 PM

Articles in above tabs,page 1,detonation

22crazy · 12-25-2002, 02:26 PM

what do u mean page 1....detonation?

92b16vx · 12-25-2002, 02:31 PM

I mean there is a article about detonation that will give you a good idea about the compession question you have in regards to octane levels.

22crazy · 12-25-2002, 02:33 PM

where is the article? if it is the one in articles - detonation it only talks about psi...i need to no the compression of the pistons i need to buy so that it will work with the gas i can supply ( 94 octane )

B16 · 12-25-2002, 02:43 PM

i think calesta is running 12.5:1 on 93 octane, that is probably the highest i'd go on pump gas

22crazy · 12-25-2002, 02:45 PM

ya 12.5:1 is pretty high too...and i no i can get 94 so i dunno i try messaging him and asking him...thanx for the post b16

92b16vx · 12-25-2002, 02:51 PM

Sorry never said it would give you the exact figures your looking for,just a good idea of the theory and from there the world is yours.

22crazy · 12-25-2002, 02:52 PM

thanx

Calesta · 12-26-2002, 10:33 PM

Quote:

Originally posted by B16@Dec 25 2002, 01:49 PM
i think calesta is running 12.5:1 on 93 octane, that is probably the highest i'd go on pump gas

12.6:1 on 93

djextremity · 12-28-2002, 04:36 AM

Don't forget, if you're ever out of your comfort zone where 94 octane is NOT available, you will have to be able to run the highest octane rating available with a bottle of octane booster (usually .6-.8 octane) and not get detonation..just something to think about.

davidbr · 12-28-2002, 06:24 AM

would 13:1 safe on 99octane? sorry, but i dont want to make a new thread...
i know no one can say for real, just guesses

IMPORT PRO · 12-28-2002, 06:36 PM

David

13.0:1 on 100 octane should work, but might nock and ping from predetination but won't harm the motor.

for the 94 octane question yes, 11.0:1 will work even for highway use.

That's coming from a honda/gm technician.

pissedoffsol · 12-29-2002, 04:23 AM

and you could always retard the dist. if you had to to get by on a tank of weaker gas, and NOT BEAT ON IT or take it up so high...

12-25-2002, 02:01 PM	#1
22crazy Senior Member Join Date: Nov 2002 Posts: 307 iTrader: 0 / 0% Rep Power: 18	what up. Ive been searching the net and asking people but nobody has been able to answer my question. I wouldnt mind building a crazy NA motor but the problem i face is compression vs octane. I no if someone wants to build a NA motor u need high compression, but the problem is that the higher compression u go, the higher octane u need to go. My problem is that in my area the highest octane u can buy at a pump is 94...i can buy octane boosters, but i dont want to buy a booster everytime i go to the pump. Does anyone no whats the highest compression u can have inside your engine using 94 octane before the gas spontaneously explodes because of compression instead of spark. Thanx __________________ "Only two things are infinite, the universe and human stupidity, and I'm not sure about the universe" - Albert Einstein

12-25-2002, 02:09 PM	#2
92b16vx B happy Join Date: Nov 2002 Location: Location: Location: Location: Age: 38 Posts: 13,020 iTrader: 1 / 100% Ride: dohc 95 egg Rep Power: 186	Articles in above tabs,page 1,detonation __________________ 95 CX\|B16A2 XBL \| binary xj0hnx \| Halo 3

12-25-2002, 02:26 PM	#3
22crazy Senior Member Join Date: Nov 2002 Posts: 307 iTrader: 0 / 0% Rep Power: 18	what do u mean page 1....detonation? __________________ "Only two things are infinite, the universe and human stupidity, and I'm not sure about the universe" - Albert Einstein

12-25-2002, 02:31 PM	#4
92b16vx B happy Join Date: Nov 2002 Location: Location: Location: Location: Age: 38 Posts: 13,020 iTrader: 1 / 100% Ride: dohc 95 egg Rep Power: 186	I mean there is a article about detonation that will give you a good idea about the compession question you have in regards to octane levels. __________________ 95 CX\|B16A2 XBL \| binary xj0hnx \| Halo 3

12-25-2002, 02:33 PM	#5
22crazy Senior Member Join Date: Nov 2002 Posts: 307 iTrader: 0 / 0% Rep Power: 18	where is the article? if it is the one in articles - detonation it only talks about psi...i need to no the compression of the pistons i need to buy so that it will work with the gas i can supply ( 94 octane ) __________________ "Only two things are infinite, the universe and human stupidity, and I'm not sure about the universe" - Albert Einstein


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12-25-2002, 02:43 PM	#6
B16 Super Moderator Join Date: Sep 2002 Location: yay area, CA Age: 31 Posts: 6,759 iTrader: 0 / 0% Rep Power: 126	i think calesta is running 12.5:1 on 93 octane, that is probably the highest i'd go on pump gas __________________ 2005 Mitsubishi Lancer Evolution 8 2004 BMW 325i 2000 Mercedes Benz ML 430 1994 Honda Civic Del Sol VTEC (race kaa)

12-25-2002, 02:45 PM	#7
22crazy Senior Member Join Date: Nov 2002 Posts: 307 iTrader: 0 / 0% Rep Power: 18	ya 12.5:1 is pretty high too...and i no i can get 94 so i dunno i try messaging him and asking him...thanx for the post b16 __________________ "Only two things are infinite, the universe and human stupidity, and I'm not sure about the universe" - Albert Einstein

12-25-2002, 02:51 PM	#8
92b16vx B happy Join Date: Nov 2002 Location: Location: Location: Location: Age: 38 Posts: 13,020 iTrader: 1 / 100% Ride: dohc 95 egg Rep Power: 186	Sorry never said it would give you the exact figures your looking for,just a good idea of the theory and from there the world is yours. __________________ 95 CX\|B16A2 XBL \| binary xj0hnx \| Halo 3

12-25-2002, 02:52 PM	#9
22crazy Senior Member Join Date: Nov 2002 Posts: 307 iTrader: 0 / 0% Rep Power: 18	thanx __________________ "Only two things are infinite, the universe and human stupidity, and I'm not sure about the universe" - Albert Einstein

12-28-2002, 04:36 AM	#11
djextremity Senior Member Join Date: Sep 2002 Location: in your rearview mirror..wait.. Posts: 965 iTrader: 0 / 0% Rep Power: 24	Don't forget, if you're ever out of your comfort zone where 94 octane is NOT available, you will have to be able to run the highest octane rating available with a bottle of octane booster (usually .6-.8 octane) and not get detonation..just something to think about.

12-28-2002, 06:24 AM	#12
davidbr Member Join Date: Dec 2002 Posts: 46 iTrader: 0 / 0% Rep Power: 15	would 13:1 safe on 99octane? sorry, but i dont want to make a new thread... i know no one can say for real, just guesses

12-28-2002, 06:36 PM	#13
IMPORT PRO Junior Member Join Date: Dec 2002 Posts: 5 iTrader: 0 / 0% Rep Power: 0	David 13.0:1 on 100 octane should work, but might nock and ping from predetination but won't harm the motor. for the 94 octane question yes, 11.0:1 will work even for highway use. That's coming from a honda/gm technician.

12-29-2002, 04:23 AM	#14
pissedoffsol RETIRED Join Date: Sep 2002 Location: Retirement Home Age: 29 Posts: 49,951 iTrader: 2 / 100% Ride: Electric Scooter Blog Entries: 1 Rep Power: 531	and you could always retard the dist. if you had to to get by on a tank of weaker gas, and NOT BEAT ON IT or take it up so high...

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Compression Question