Main earth cable?
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
Main earth cable?
my main earth cable, connects just underneath chassis engine mount, on my old engine there was a bolt in the mid section of the block, which the earth connected to engine, but on my new engine cant see that hole for that bolt, anywhere else I can connect it to on block, its on the starter motor side
cheers
dave
cheers
dave
Team Owner
Joined: Jul 2004
Posts: 40,338
Likes: 786
From: Redondo Beach, California
Two?
I'd think one of the bolts that holds on the starter would be a good way to attach to the engine. I also ran a ground wire from an alternator/bracket bolt (maybe a 10 gauge wire) to ground.
One thing interesting to think about. Lets say the impedance (resistance) of your ground is, say 2 milliohms. 2 milliohms will look actually show up as 0 ohms on most ohmmeters. The starter can draw 200 or more amperes turning the engine. 2 milliohms will cause the engine block to be 0.2 vDC, or more, above ground, while running the starter motor.
I'd think one of the bolts that holds on the starter would be a good way to attach to the engine. I also ran a ground wire from an alternator/bracket bolt (maybe a 10 gauge wire) to ground.
One thing interesting to think about. Lets say the impedance (resistance) of your ground is, say 2 milliohms. 2 milliohms will look actually show up as 0 ohms on most ohmmeters. The starter can draw 200 or more amperes turning the engine. 2 milliohms will cause the engine block to be 0.2 vDC, or more, above ground, while running the starter motor.
Race Director
Joined: May 2006
Posts: 16,528
Likes: 53
From: Dayton, Ohio
Two?
I'd think one of the bolts that holds on the starter would be a good way to attach to the engine. I also ran a ground wire from an alternator/bracket bolt (maybe a 10 gauge wire) to ground.
One thing interesting to think about. Lets say the impedance (resistance) of your ground is, say 2 milliohms. 2 milliohms will look actually show up as 0 ohms on most ohmmeters. The starter can draw 200 or more amperes turning the engine. 2 milliohms will cause the engine block to be 0.2 vDC, or more, above ground, while running the starter motor.
I'd think one of the bolts that holds on the starter would be a good way to attach to the engine. I also ran a ground wire from an alternator/bracket bolt (maybe a 10 gauge wire) to ground.
One thing interesting to think about. Lets say the impedance (resistance) of your ground is, say 2 milliohms. 2 milliohms will look actually show up as 0 ohms on most ohmmeters. The starter can draw 200 or more amperes turning the engine. 2 milliohms will cause the engine block to be 0.2 vDC, or more, above ground, while running the starter motor.
Safety Car
Joined: Jun 2004
Posts: 4,363
Likes: 221
From: Beecher Illinois
Factory bolted it to the same bolt as the starter support bracket...
On my header equipted black79 I pulled it forward and attached it with the same bolt that the lower AC support attaches with, near the fuel pump.
On my header equipted black79 I pulled it forward and attached it with the same bolt that the lower AC support attaches with, near the fuel pump.
Last edited by KapsSA; Aug 20, 2008 at 01:03 PM.
Team Owner
Joined: Jul 2004
Posts: 40,338
Likes: 786
From: Redondo Beach, California
Maybe I don't understand. Each motor mount only has one bolt. Two motor mounts = 2 bolts. Am I missing something??
Actually, the entire engine/bellhousing/transmission stack is held on with only four bolts; one bolt for each of the two motor mounts and two bolts where the transmission bolts onto the crossmember bracket. So I can see talking about 2 bolts, or maybe even 4, but I can't visualize a three bolt situation.
Actually, the entire engine/bellhousing/transmission stack is held on with only four bolts; one bolt for each of the two motor mounts and two bolts where the transmission bolts onto the crossmember bracket. So I can see talking about 2 bolts, or maybe even 4, but I can't visualize a three bolt situation.
Thread Starter
Burning Brakes
Joined: Apr 2008
Posts: 825
Likes: 40
From: Glasgow, Scotland
Maybe I don't understand. Each motor mount only has one bolt. Two motor mounts = 2 bolts. Am I missing something??
Actually, the entire engine/bellhousing/transmission stack is held on with only four bolts; one bolt for each of the two motor mounts and two bolts where the transmission bolts onto the crossmember bracket. So I can see talking about 2 bolts, or maybe even 4, but I can't visualize a three bolt situation.
Actually, the entire engine/bellhousing/transmission stack is held on with only four bolts; one bolt for each of the two motor mounts and two bolts where the transmission bolts onto the crossmember bracket. So I can see talking about 2 bolts, or maybe even 4, but I can't visualize a three bolt situation.
dave
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Joined: Jul 1999
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From: Orange Park Florida
Maybe I don't understand. Each motor mount only has one bolt. Two motor mounts = 2 bolts. Am I missing something??
Actually, the entire engine/bellhousing/transmission stack is held on with only four bolts; one bolt for each of the two motor mounts and two bolts where the transmission bolts onto the crossmember bracket. So I can see talking about 2 bolts, or maybe even 4, but I can't visualize a three bolt situation.
Actually, the entire engine/bellhousing/transmission stack is held on with only four bolts; one bolt for each of the two motor mounts and two bolts where the transmission bolts onto the crossmember bracket. So I can see talking about 2 bolts, or maybe even 4, but I can't visualize a three bolt situation.
