Compression - ? for TBI'rs
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Joined: Feb 2001
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From: San Diego
Compression - ? for TBI'rs
What compression are you guys running OTHER than stock?
About how high can you safely go on premium?
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89CamaroRS
Power Rating: 1.21 Jigowatts
Mods:Flux Capacitor
Future Plans: Time Travel
About how high can you safely go on premium?
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89CamaroRS
Power Rating: 1.21 Jigowatts
Mods:Flux Capacitor
Future Plans: Time Travel
Senior Member
Joined: Oct 1999
Posts: 6,621
Likes: 2
Car: 91 Red Sled
Axle/Gears: 10bolt Richmond 3.73 Torsen
I wish I could give you a good number but you also should figure on getting a custom chip burned. You can always retard the timing and run a little more timing.
The general rule is no more than 10.5 to 1. My friend is running 10.2:1 in his 327 and he uses 94 octane. That's with Dart Iron eagle heads, I wouldn't go more than that with iron and I wouldn't go more than 10.5 with aluminum.
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, Jon (350 TBI! it's trenuous and efficacious while getting 23mpg highway with off the shelf eprom)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost
The general rule is no more than 10.5 to 1. My friend is running 10.2:1 in his 327 and he uses 94 octane. That's with Dart Iron eagle heads, I wouldn't go more than that with iron and I wouldn't go more than 10.5 with aluminum.
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, Jon (350 TBI! it's trenuous and efficacious while getting 23mpg highway with off the shelf eprom)
91 Red RS w/grey int, sq stereo (Alpine v12, kicker solo, MB quart premium etc)AIM: JPrevost
- Holley 670 TB unit w/ 1/2" spacer/adapter
- Edelbrock RPM vortec intake
- 350ho 330hp vortec crate motor
- 8" harm. balancer
- Stewart stage 2 water pump w/160 thermo
- SLP tri-y headers to full 3"
- Rebuilt trans w/ SLP shift kit
- Centerline 16x8's all around
- 36/24 mm sway bars
- Full poly bushings, even motor mounts
- SLP LCA and panhard
- Alston SFCs
- Edelbrock 3 point STB
- Global west steering brace aka wonderbar
- Eibach pro kit springs
- Bilstien high perf. struts and shocks
- All this and I still have AC
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Joined: Sep 1999
Posts: 2,175
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From: Ewing, NJ
you can get away with up to 11.5 to 1 on pump gas in a small block. at that point you will hafta be a lot more conservative with the timing though. if you go with longer connecting rods (stock is 5.7in) you can get away with even more compression.
the best way to build compression is always from the head, reducing chamber size, pop up pistons can mess up th eflame spread and cause detonation and serious performance loss.
lata
tim
tim
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91 Camaro RS-LO3,Auto.
14.209@95.46mph
Best 60' 1.917
Check Out The East Coast F-Body Nationals Home Page
www.geocities.com/njspeeder
My MAFB.ORG Home Page
www.mycar.net/mafb/registry/detail.cfm?id=299
DSI Racing Home Page
www.geocities.com/foff667
the best way to build compression is always from the head, reducing chamber size, pop up pistons can mess up th eflame spread and cause detonation and serious performance loss.
lata
tim
tim
------------------
91 Camaro RS-LO3,Auto.
14.209@95.46mph
Best 60' 1.917
Check Out The East Coast F-Body Nationals Home Page
www.geocities.com/njspeeder
My MAFB.ORG Home Page
www.mycar.net/mafb/registry/detail.cfm?id=299
DSI Racing Home Page
www.geocities.com/foff667
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