Very interesting results......
11-12-2007, 09:07 PM
#1
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Very interesting results...... well i was driving home and suddenly the car started missing horribly.... i was racing my buddies cobra the other day and in the middle of the race it felt like somebody kicked my car in the ***** and it lost all power. just fell flat on its face.
todays incident had me really worried.. car was clearly down a cylinder or two and just all over the place.
took out the plugs, pulled the fuses, and decided to do a compression test.
results are:
1 - 210
2 - 225
3 - 230
4 - 215
5 - 225
6 - 225
7 - 225
8 - 225
HELLL YEAH!!!!
this engine has well over 35k HIGHLY ABUSIVE miles on it lol.. i have flogged this thing, sprayed this thing, burnt up more plugs than i dare count, had head gaskets fail, had valves start to fail.... you name it .. ive dealt with it.
Erik koneig built me a freaking BADASS motor and i cant believe this thing is holding the compression like a champ still.
while testing the compression i encountered a wierd problem i never noticed before.. my car wont stay cranking???
it will crank to what feels like 1 or two revolutions and then will either stop, or start this god aweful grinding noise.
here is a vid... anybody have any ideas? im holding the key solid, not pulsing it, and it kinda pulses on its own????
todays incident had me really worried.. car was clearly down a cylinder or two and just all over the place.
took out the plugs, pulled the fuses, and decided to do a compression test.
results are:
1 - 210
2 - 225
3 - 230
4 - 215
5 - 225
6 - 225
7 - 225
8 - 225
HELLL YEAH!!!!
this engine has well over 35k HIGHLY ABUSIVE miles on it lol.. i have flogged this thing, sprayed this thing, burnt up more plugs than i dare count, had head gaskets fail, had valves start to fail.... you name it .. ive dealt with it.
Erik koneig built me a freaking BADASS motor and i cant believe this thing is holding the compression like a champ still.
while testing the compression i encountered a wierd problem i never noticed before.. my car wont stay cranking???
it will crank to what feels like 1 or two revolutions and then will either stop, or start this god aweful grinding noise. here is a vid... anybody have any ideas? im holding the key solid, not pulsing it, and it kinda pulses on its own????
11-12-2007, 10:05 PM
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yes, all the plugs are out.
what do you mean not very good news?? the compression all tested out kick ***. so clearly there isnt anything super major wrong?
im guessing its either a bad coil pack or a bad wire. the engine obviously isnt hurt to hold compression that well.
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11-12-2007, 10:39 PM
#8
yes, all the plugs are out.
what do you mean not very good news?? the compression all tested out kick ***. so clearly there isnt anything super major wrong?
im guessing its either a bad coil pack or a bad wire. the engine obviously isnt hurt to hold compression that well.
what do you mean not very good news?? the compression all tested out kick ***. so clearly there isnt anything super major wrong?
im guessing its either a bad coil pack or a bad wire. the engine obviously isnt hurt to hold compression that well.
11-13-2007, 01:10 AM
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the car has always cranked like this... for the last 2 years...
when the car is cold in the mornings it never starts on the first "quick hit" of the key. it always starts on the second try, every time, the second i hit the key she turns over no problem.
i always assumed it was a safety precaution so that you wouldnt kill your starter or your battery and that the computer made it go in "bursts" so you couldnt sit and hold the starter on. ?
the main subject on hand is my compression. looks pretty kick *** for a high mileage beat up motor does it not?
11-13-2007, 07:56 AM
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well i was driving home and suddenly the car started missing horribly.... i was racing my buddies cobra the other day and in the middle of the race it felt like somebody kicked my car in the ***** and it lost all power. just fell flat on its face.
todays incident had me really worried.. car was clearly down a cylinder or two and just all over the place.
took out the plugs, pulled the fuses, and decided to do a compression test.
results are:
1 - 210
2 - 225
3 - 230
4 - 215
5 - 225
6 - 225
7 - 225
8 - 225
HELLL YEAH!!!!
this engine has well over 35k HIGHLY ABUSIVE miles on it lol.. i have flogged this thing, sprayed this thing, burnt up more plugs than i dare count, had head gaskets fail, had valves start to fail.... you name it .. ive dealt with it.
Erik koneig built me a freaking BADASS motor and i cant believe this thing is holding the compression like a champ still.
while testing the compression i encountered a wierd problem i never noticed before.. my car wont stay cranking??? it will crank to what feels like 1 or two revolutions and then will either stop, or start this god aweful grinding noise.
here is a vid... anybody have any ideas? im holding the key solid, not pulsing it, and it kinda pulses on its own????
todays incident had me really worried.. car was clearly down a cylinder or two and just all over the place.
took out the plugs, pulled the fuses, and decided to do a compression test.
results are:
1 - 210
2 - 225
3 - 230
4 - 215
5 - 225
6 - 225
7 - 225
8 - 225
HELLL YEAH!!!!
this engine has well over 35k HIGHLY ABUSIVE miles on it lol.. i have flogged this thing, sprayed this thing, burnt up more plugs than i dare count, had head gaskets fail, had valves start to fail.... you name it .. ive dealt with it.
Erik koneig built me a freaking BADASS motor and i cant believe this thing is holding the compression like a champ still.
while testing the compression i encountered a wierd problem i never noticed before.. my car wont stay cranking???
it will crank to what feels like 1 or two revolutions and then will either stop, or start this god aweful grinding noise. here is a vid... anybody have any ideas? im holding the key solid, not pulsing it, and it kinda pulses on its own????
saying more prayers..... yet I think it is a valve from the detonation on the 300 shot.
11-13-2007, 08:41 AM
#11
I would stop cranking immediately when I heard that "grinding" noise and turn the crank manually to isolate the problem to either the engine proper or the engine starter system(starter motor, solenoid, battery, flywheel/flexplate). If the engine spins smoothly(without "grinding") by hand as you would expect it to with compression numbers like that you can zero in on the starter.
11-13-2007, 09:18 AM
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I would stop cranking immediately when I heard that "grinding" noise and turn the crank manually to isolate the problem to either the engine proper or the engine starter system(starter motor, solenoid, battery, flywheel/flexplate). If the engine spins smoothly(without "grinding") by hand as you would expect it to with compression numbers like that you can zero in on the starter.
ummm... duh?? lol the engine spins fine, the engine has spun fine for the last 35k miles that the starter has been doing this same thing... the engine spun fine when it trapped 130 MPH at 4400 Ft elevation
do some people not read all the posts?
i was just wondering if it was normal because it has always done it. even when the car was stock it seems.
anyways.... im guessing its got to be the starter... the battery is an optima yellow top and it checked out fine when i had it tested a while ago.
11-13-2007, 09:21 AM
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hell.... i actually even have a tiny ground strap permanently implanted in my #3 piston reminding me to never never never run a 200 shot through a nozzle kit on the stock fuel system with already undersized injectors
11-13-2007, 09:49 AM
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ummm... duh?? lol the engine spins fine, the engine has spun fine for the last 35k miles that the starter has been doing this same thing... the engine spun fine when it trapped 130 MPH at 4400 Ft elevation
do some people not read all the posts?
i was just wondering if it was normal because it has always done it. even when the car was stock it seems.
do some people not read all the posts?
i was just wondering if it was normal because it has always done it. even when the car was stock it seems.
And stop being a dick to people who are trying to help you out.
11-13-2007, 10:01 AM
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there is nothing wrong with the motor, i was posting my killer compression numbers with a slight question as to the starter at the end of the post... then somehow it turns into i need to not be stupid and let the key out if i hear grinding and for some odd reason turn the motor over by hand??
come on now people. as my posts and my mods and expereince show.. im not exactly new at the whole go fast thing
i guess next time my blinker stops working i should be sure i pulled all plugs and be sure the motor spins by hand?
you guys crack me up
11-13-2007, 02:00 PM
#16
If you’re referring to the noise at the end of the video (when you quit cranking it) I don’t think I would be concerned about that. I’ve heard that noise before when someone has a bad/low battery (not saying your battery is bad) and the motor doesn’t spin over fast; I don’t think it’s anything of concern. I think it’s just the sound of the motor coming to rest. If people pay attention to when they shut their car off, I think a lot of people would hear their motor make that type of noise sometimes. The reason I brought up the low battery is it sounds like it’s turning over really slow.
I use to work on Corvettes all the time, mainly C5’s; I never had a car quit cranking on me when I was turning the key (when working normal). I don’t believe the computer is programmed for that. Did this happen multiple times or just once? If multiple times, was it one after another (like if it quit cranking then you tried to crank it right away again, would it turn over at all or repeat what happened before)? Have you measured the starter to see what voltage you’re getting (if you know your battery is good)? I guess if it cranked fine before you started your test, the battery could just be low on charge from doing the compreesion test. Anyway, I don’t think that noise should be of concern.
I use to work on Corvettes all the time, mainly C5’s; I never had a car quit cranking on me when I was turning the key (when working normal). I don’t believe the computer is programmed for that. Did this happen multiple times or just once? If multiple times, was it one after another (like if it quit cranking then you tried to crank it right away again, would it turn over at all or repeat what happened before)? Have you measured the starter to see what voltage you’re getting (if you know your battery is good)? I guess if it cranked fine before you started your test, the battery could just be low on charge from doing the compreesion test. Anyway, I don’t think that noise should be of concern.
11-13-2007, 02:18 PM
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If you’re referring to the noise at the end of the video (when you quit cranking it) I don’t think I would be concerned about that. I’ve heard that noise before when someone has a bad/low battery (not saying your battery is bad) and the motor doesn’t spin over fast; I don’t think it’s anything of concern. I think it’s just the sound of the motor coming to rest. If people pay attention to when they shut their car off, I think a lot of people would hear their motor make that type of noise sometimes. The reason I brought up the low battery is it sounds like it’s turning over really slow.
I use to work on Corvettes all the time, mainly C5’s; I never had a car quit cranking on me when I was turning the key (when working normal). I don’t believe the computer is programmed for that. Did this happen multiple times or just once? If multiple times, was it one after another (like if it quit cranking then you tried to crank it right away again, would it turn over at all or repeat what happened before)? Have you measured the starter to see what voltage you’re getting (if you know your battery is good)? I guess if it cranked fine before you started your test, the battery could just be low on charge from doing the compreesion test. Anyway, I don’t think that noise should be of concern.
I use to work on Corvettes all the time, mainly C5’s; I never had a car quit cranking on me when I was turning the key (when working normal). I don’t believe the computer is programmed for that. Did this happen multiple times or just once? If multiple times, was it one after another (like if it quit cranking then you tried to crank it right away again, would it turn over at all or repeat what happened before)? Have you measured the starter to see what voltage you’re getting (if you know your battery is good)? I guess if it cranked fine before you started your test, the battery could just be low on charge from doing the compreesion test. Anyway, I don’t think that noise should be of concern.
on lunch i went home after the car has been on the charger and had kind of a "duh" moment....
without ANY plugs in the motor (no compression tester either) the engine cranks over fast and keeps cranking with no problems. I think the problem is the fact that im running 11.5ish : 1 compression and my compression test was showing upwards of 230 PSI...
i think the problem is that the stock rated starter is having a tough time turning the motor over with that kind of compression. the stock motor generally only has 180 ish PSI on a solid motor, that 50 PSI extra to turn over!~!
so thanks for the posts and i think that solves that little mystery. Does anybody make a more powerful starter?
11-13-2007, 02:43 PM
#18
If that’s the problem, I believe the LS2’s are 11:1 so you could check into that starter if it bolts up. I never did motor swaps for more displacement, only heads/cam. The series we always entered had to have stock displacement. I guess you could call the company you bought your motor from and check with them.
