Engine ground - Team Camaro Tech
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post #1 of 7 (permalink) Old Jan 2nd, 07, 06:34 AM Thread Starter
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Mike
 
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Engine ground

I have a 67 with a BBC.
I have a large braided ground strap that bolt to the block and to the frame. The engine won't start without it.

So now I'm mounting something to that side, is there anything electrically wrong with attaching the strap to one of the water pump bolts?
I don't know about electrolysis or anything else that might come about from grounding to the water pump.

The water pump is a Moroso and its a aluminum but the bolt isn't.

Also, I don't have a mechanical fuel pump. What about going to one of those bolts that attach that blank to the block, where a mechanical pump would be?
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post #2 of 7 (permalink) Old Jan 2nd, 07, 06:48 AM
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Re: Engine ground

No problems mounting to a water pump bolt. You just want a good electrical connection at the bolt. No paint, rust, corrosion, etc. You would actually be better off to have a large ground wire going direct from the block to the battery.
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post #3 of 7 (permalink) Old Jan 2nd, 07, 08:31 AM
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Re: Engine ground

engine to frame
engine to body at the firewall is the correct method.


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post #4 of 7 (permalink) Old Jan 2nd, 07, 08:42 AM
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Re: Engine ground

I would suggest to use the fuel pump rod bolt on the front of the block rather than the water pump bolt.

You are not using the bolt for current carrying if the cable was attached at the water pump. The best place to attach the ground cable would be at the starter frame.

The less connections, the better the conduction path.

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post #5 of 7 (permalink) Old Jan 2nd, 07, 10:18 AM
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Re: Engine ground

I deally , If u have a self regulating Alternator, is to have the Bat -ve connect as close to the Alternator as possible...And have the factory earth wires (engine to chassis/firewall)
I have the Bat -ve going to the back of the lower alternator mounting bolt, for cosmetic reasons....I also run the Bat Alternator wire together with the Bat -ve strap.
The Tmp senser wire can also run here...thu I run mine under the upper radiator hose

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post #6 of 7 (permalink) Old Jan 9th, 07, 11:56 AM
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Re: Engine ground

Those ground straps are used to help prevent interferance on your AM radio. The negative battery cable should ground directly to the block (large wire). There should also be a short fusable link from the negative cable to the right fender. I suspect the fender ground wire is missing or not making a good connection. That would explain why you're having to use the ground straps.

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post #7 of 7 (permalink) Old Jan 9th, 07, 01:22 PM
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Re: Engine ground

I don't think big blocks have front motor mount bolts... the fuel pump bolt would be just fine. Use a star washer or two to ensure a good connection.

I assume your ground strap is BIG, not the little radio ground straps right?

I also assume your trunk mounted battery is grounded to the body back there?

If that is the case, I'd attach the other end of the engine ground strap to one of the bolts on the firewall that attach the inner fender support braces, that way you have a solid body ground at both ends.
The subframe is all rubber mounted, not a good choice, and if you use the front sheetmetal, you're relying on it's attaching bolts to provide your ground, not good enough for me, especially with the whole length of the car between the motor and the battery.





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