Motor cranks very slow now? - Team Camaro Tech
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post #1 of 24 (permalink) Old May 22nd, 01, 03:15 PM Thread Starter
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We got the motor fired 3 weeks ago and broke in the cam and set the timming. Everything was fine and it cranked very fast. Now it cranks very slow and almost won't turn the motor over? any ideas?

The starter is a powermaster xs torque mini rated to 18:1 comp, i have 10.5:1 ( i replaced this with a new one ). the battery is brand new ( i tried another batteries just in case) and the car is wired with the painless kit. After changing the starter and the battery i still have the problem so i hooked the battery directly to the starter to see how fast it would crank the motor and it was no different? HELP!!!

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post #2 of 24 (permalink) Old May 22nd, 01, 03:52 PM
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Try retarding the timing some . If timing is too advanced, it can make the engine harder to turn over...
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post #3 of 24 (permalink) Old May 22nd, 01, 05:32 PM
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Make sure the distributor hold down isn't allowing it to turn in the block. That's about all I can think of.
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post #4 of 24 (permalink) Old May 22nd, 01, 05:35 PM
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When your rings seated the compression increased.
Try cranking with the coil wire off and see if it's better. If no better it's most likely a more powerful starter that's needed.

If it cranks over fast enough, it's a timing problem, too advanced.
David

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post #5 of 24 (permalink) Old May 23rd, 01, 04:13 AM
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I have seen new Battery cables that aren't properly crimped or maybe there is paint under the neg. cable where it bolts to the block. Are they good cables ? Did you try jumper cables ? Is the alternator charging ? When running the rear bearing in the alt. will be magnetized if it is charging. I have fooled myself before by changing batteries trying to solve the same problem only to find out later that both batteries were low. I would also pull the plugs and try to spin the engine. Turn it by hand at the crank with the plugs out. Does it turn hard ? Please let us know what you find out.
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post #6 of 24 (permalink) Old May 23rd, 01, 06:51 AM Thread Starter
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i hook up the battery to the starter with jumper cables bypassing the ignition and it still cranked slow. after it sits for awhile it will crank fast enough to start the motor and i checked the timming. it won't restart again for a few hours. the car likes it at around 15 to 20 anything lower than 15 it backfries throught the carb. All the cables are good, i made them myself with high grade copper power wire and gold termanials and s sodered them. ive been making cables for 14 years in the car audio industry. I tried turning the engine by hand ( with the plugs in) and it will tur to a point and then i can't move it any more. i'm going to try it with the plugs out tonight. I was able to turn the motor by hand before, did someting happen in the motor maybe?
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post #7 of 24 (permalink) Old May 23rd, 01, 09:33 AM
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Jenndon, check out this thread. I had a similar problem with my 454 and got a lot of good suggestions from these guys.
https://www.camaros.net/forum/Forum1/HTML/004664.html
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post #8 of 24 (permalink) Old May 24th, 01, 08:06 AM Thread Starter
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thanks billydean, i'll check it out.

I took the plugs out and the motor is hard to turn by hand. i used a 1/2" breaker bar with a long handle. the battery is in the trunk, it's grounded to the body with 4 ga wire. The body is grounded to the sub frame with 4 ga wire and i have a 4ga going from the subframe to the trans. The reason i did it from the trans is that i'm trying to hide it. i used a meter to chek and the motor is grounded. I was told it could be a bearing? The car would crank and start very easy for the past 4 weeks. Now it would even start. Sometimes it will start if it is cold but if i shut it off, it won't crank enough to restart it.
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post #9 of 24 (permalink) Old May 24th, 01, 09:10 AM
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Drain the Oil into a clean container and examine it for metal Particles. Cut the Oil Filter apart with a Saw and see if there is metal in there.
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post #10 of 24 (permalink) Old May 24th, 01, 10:23 AM Thread Starter
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i'll try that. The guy who built my motor is comming over to check it out
thanks
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post #11 of 24 (permalink) Old May 26th, 01, 02:47 PM
 
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do you have a heat shield over the selenoid? I had the same problem turning over my 350cid and even replaced the starter, but after advice from a buddy i put on a heat shield and had no more problems.
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post #12 of 24 (permalink) Old May 26th, 01, 02:47 PM
 
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do you have a heat shield over the selenoid? I had the same problem turning over my 350cid and even replaced the starter, but after advice from a buddy i put on a heat shield and had no more problems.
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post #13 of 24 (permalink) Old May 30th, 01, 02:35 PM Thread Starter
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ok here's an update. Tried a 3rd battery, different brand and size 900 cca. when i start the motor the battery drops to 9.2 volts from 12.6 volts. I have the big Powermaster XS Torq. starter....do you think this starter need to run on a 16 volt battery? I replaced it with another one, the first one came from Summit and the 2nd one i got local. The starter seems to be pulling to much from the battery?

Any idea's?
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post #14 of 24 (permalink) Old May 30th, 01, 05:35 PM
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Sounds more like the starter is having to work too hard. It might just be a very tight engine that will loosen up as you get some time on it. Did you ever drain the oil and check for particles ?
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post #15 of 24 (permalink) Old May 30th, 01, 06:12 PM
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<BLOCKQUOTE>quote:</font><HR>Originally posted by jenndon:
thanks billydean, i'll check it out.

I took the plugs out and the motor is hard to turn by hand. i used a 1/2" breaker bar with a long handle.
<HR></BLOCKQUOTE>

How hard to turn, Feel any binding? funny noises? its Difficult to quantify "hard to turn" without comparing to another similar engine. Maybe you could try to spin a similar block without the plugs installed, and make a fair judgment on the level of difficulty to rotate the engine by hand.
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