Adjust Timing
11-27-2001, 03:24 PM
#1
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Adjust Timing
What happensa when you advance the timing, does your compression get highere?
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1973 Chevy Nova
SBC 350
Hedman Headers
Holley Intake
Holley 750DP
MT Slicks
4.88 Gears
BW 4-Speed Tranny
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1973 Chevy Nova
SBC 350
Hedman Headers
Holley Intake
Holley 750DP
MT Slicks
4.88 Gears
BW 4-Speed Tranny
11-27-2001, 03:54 PM
#2
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The compression is a result of how much space you have in the chamber, not the timing.
However, advancing the timing does increase the pressure in the cylinder. When you advance the timing, you're making the air/fuel mix ignite earlier in the piston's travel, in this case, while it's on it's way up. The explosion isn't an instant event -- if it were, every car would be set to 0* TDC for the best timing. So, imagine this: You have the timing set to 6*BTDC, or 6* advanced. While the piston is still heading up, some of the explosion is going on, and as such, some of the energy of the explosion is trying to force the piston backwards, while the rest of it is used to push it forward while it's on it's way back down. At 6*, this usually isn't much of an issue. But let's go for something extreme now, like.. 50* advanced. heh. At such a setting, most of the explosion would try to force the piston backwards, and very little would be left to try to get it to go back down again. As you could imagine, trying to get a piston to suddenly change directions is very unhealthy for just about everything in your engine. Heads break, cylinder walls crack, rods break, everything gets really really hot so things could start fusing together, yatta yatta.
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89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else
However, advancing the timing does increase the pressure in the cylinder. When you advance the timing, you're making the air/fuel mix ignite earlier in the piston's travel, in this case, while it's on it's way up. The explosion isn't an instant event -- if it were, every car would be set to 0* TDC for the best timing. So, imagine this: You have the timing set to 6*BTDC, or 6* advanced. While the piston is still heading up, some of the explosion is going on, and as such, some of the energy of the explosion is trying to force the piston backwards, while the rest of it is used to push it forward while it's on it's way back down. At 6*, this usually isn't much of an issue. But let's go for something extreme now, like.. 50* advanced. heh. At such a setting, most of the explosion would try to force the piston backwards, and very little would be left to try to get it to go back down again. As you could imagine, trying to get a piston to suddenly change directions is very unhealthy for just about everything in your engine. Heads break, cylinder walls crack, rods break, everything gets really really hot so things could start fusing together, yatta yatta.
------------------
89 iroc-z 305 tbi
k&n filtercharger, open element air filter. nuffin' else
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