gearing for lowest ET?

acme383 · 05-27-2010, 10:36 AM

how much past your peak hp do you gear for to get the lowest ET. i've heard that anything past the 1/8 and the engine is got it's tongue hanging out.

Adger Smith · 05-27-2010, 05:35 PM

Depends on what the power curve of the engine is. If HP drops like a rock. very little might even be too much.
You can over gear in the 1/8 and not have enough wheel speed leaving or have a spin problem.. Just get in high a little after the 330 is what most of the quickest Comp guys do. But you better have something that has some beans to do that!!!

junior barns · 05-27-2010, 10:35 PM

Quote:

Originally Posted by Adger Smith

Depends on what the power curve of the engine is. If HP drops like a rock. very little might even be too much.
You can over gear in the 1/8 and not have enough wheel speed leaving or have a spin problem.. Just get in high a little after the 330 is what most of the quickest Comp guys do. But you better have something that has some beans to do that!!!

what do you call "drops like a rock". 10 to 15HP say at 500 rpm past peak HP??

Jeff Lee · 05-27-2010, 11:41 PM

Some Pontiac engines, for example, may be something that would "drop like a rock" if you over gear. High torque, poor flowing heads would not like over zealous gearing.
If in doubt, it is far greater to under gear it than over gear it.

greg fulk · 05-28-2010, 12:46 AM

Our 6 cyl is WAY over geared ! 5.13 with a 2.08 low (P/G) and 26" tall tires....1000' it was done but it needed all that gear to get it off the line & moving

the 1bbl carb acted like cruse control it would just pull up to 5800 & run

05-27-2010, 10:36 AM	#1
acme383 Junior Member Join Date: Mar 2005 Location: chitown Posts: 55 Likes: 0 Liked 0 Times in 0 Posts	gearing for lowest ET? how much past your peak hp do you gear for to get the lowest ET. i've heard that anything past the 1/8 and the engine is got it's tongue hanging out.

05-27-2010, 05:35 PM	#2
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: gearing for lowest ET? Depends on what the power curve of the engine is. If HP drops like a rock. very little might even be too much. You can over gear in the 1/8 and not have enough wheel speed leaving or have a spin problem.. Just get in high a little after the 330 is what most of the quickest Comp guys do. But you better have something that has some beans to do that!!! __________________ Adger Smith (Former SS)

05-27-2010, 11:41 PM	#4
Jeff Lee VIP Member Join Date: Jul 2007 Location: Anthem, Arizona Posts: 2,766 Likes: 0 Liked 3 Times in 3 Posts	Re: gearing for lowest ET? Some Pontiac engines, for example, may be something that would "drop like a rock" if you over gear. High torque, poor flowing heads would not like over zealous gearing. If in doubt, it is far greater to under gear it than over gear it. __________________ Jeff Lee 7494 D/S '70 AMX

05-28-2010, 12:46 AM	#5
greg fulk VIP Member Join Date: Jan 2003 Location: jackson Posts: 1,165 Likes: 0 Liked 5 Times in 3 Posts	Re: gearing for lowest ET? Our 6 cyl is WAY over geared ! 5.13 with a 2.08 low (P/G) and 26" tall tires....1000' it was done but it needed all that gear to get it off the line & moving the 1bbl carb acted like cruse control it would just pull up to 5800 & run __________________ Greg Fulk 308 308X P/SA "ALL AMERICAN"