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Old 02-26-2013, 08:13 PM   #1
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starter motors keep going?

I bought my mustang back that I sold a month ago(I missed it too much haha) but my buddy who had it had to replace the starter that I put on in august. It was a brand new high torque mini starter for 11:1 compression and lower. The starter that was on it when I first bought it was on for only about 7 months. That's 3 starters within 2 years, what could cause them to keep slowing down and then not even fast enough to turn the motor over. Few people said if my compressions high then the starter might be having trouble turning the motor after a while. I was told the cr was 12.5:1 but everyone said it couldn't be if I was running 94 octane only.
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Old 02-26-2013, 08:34 PM   #2
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That comp # sounds pretty high, could be a bad ground or bad ground cable causing the the starters to burn up so fast.. Follow the wires and make sure the wires are in good shape..
Has there been any issues with the battery?
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Old 02-26-2013, 08:39 PM   #3
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That comp # sounds pretty high, could be a bad ground or bad ground cable causing the the starters to burn up so fast.. Follow the wires and make sure the wires are in good shape..
Has there been any issues with the battery?
I replaced the whole ground wire when I put the 2nd starter on it. And the batterys fine ever since I fixed the electrical problems I had with the tail lights.
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Old 02-26-2013, 08:52 PM   #4
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I replaced the whole ground wire when I put the 2nd starter on it. And the batterys fine ever since I fixed the electrical problems I had with the tail lights.
That's odd..
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Old 02-26-2013, 09:04 PM   #5
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That's odd..
Yeah I know. My buddy who had it had no clue either. Is it possible my cr could be too high for the 11:1 limit?
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Old 02-26-2013, 09:06 PM   #6
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Yeah I know. My buddy who had it had no clue either. Is it possible my cr could be too high for the 11:1 limit?
Is your user name accurate, the 347 part? I see you are running a carbed set up too. Do you know the build specs etc if so?
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Old 02-26-2013, 09:11 PM   #7
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Is your user name accurate, the 347 part? I see you are running a carbed set up too. Do you know the build specs etc if so?
I'm not 100% sure on every spec. I did get a chance to see the receipts and some pics of everything that was done to it when I sold it back to the guy but I know they're high compression pistons I don't remember the brand or anything. And the heads I thought were gt40s when I first bought the car but then couldn't find the gt stamp and they didn't have the bars. I found out they're heads that were bought from andy jensons machine shop. Again I'm not sure of the specs on those tho.
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Old 02-27-2013, 07:24 AM   #8
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You can do a co.expression test. If your less than 180 lbs you prolly have stock compression ratio.

Is your header collector leaking? Putting direct heat on the starter will kill it fast. Or bad wiring like dead said.
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Old 02-27-2013, 08:44 AM   #9
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You can do a co.expression test. If your less than 180 lbs you prolly have stock compression ratio.

Is your header collector leaking? Putting direct heat on the starter will kill it fast. Or bad wiring like dead said.
Didn't think about the collector leaking, also some headers are very close to the starter anyway good point dream
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Old 02-27-2013, 02:02 PM   #10
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You can do a co.expression test. If your less than 180 lbs you prolly have stock compression ratio.

Is your header collector leaking? Putting direct heat on the starter will kill it fast. Or bad wiring like dead said.
That could be it. My shortys are somewhat near there. And just wondering how do you do a cr test
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Old 02-27-2013, 03:17 PM   #11
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That could be it. My shortys are somewhat near there. And just wondering how do you do a cr test
You can rent a compression tester from autozone. I have a heighbor freight one that didn't cost much. You need to get the car up to temp. The pull a spark plug. Then thread in the tester. Then just bump the starter afrs times and see what it says. Most 302s will pull around 150ish give or take. A high compression motor will have more, but I don't know exactly. And this isn lt super accurate but may give you an idea if you have a high com ratio or not.
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