Rebuilt engine, and Exhaust arcing
#1
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Rebuilt engine, and Exhaust arcing
Hey guys, Just fired up the rebuild today, fired up pretty much right away, tonnes of smoke but after 10 minutes i have her idling at 1000, and a nice even exhaust note, starts up right away also with used housings and new apexs. Anyways, when first trying to get her started up, my friend noticed that my exhaust tips were arcing electricical sparks against the reat metal part of the lower bumper, I bent the metal part up so it wasn't near the exhaust and it stopped, but what would cause this, I did recently put the battery in the trunk, but it wouldn't explain the sparks? There aren't any shorts, and everything else works fine, the exhaust also only arcs when cranking the engine. What gives guys, its got me scratching my head. On a side note its so nice to hear that sweet rotary exhaust note after 7 months.
Thanks, Matt
Thanks, Matt
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I noticed that on Sec gen cars(may not Pertain to you..but here goes anyways)..That on mine ther was a ground strap that attches to the Exhaust and goes to the Frame.When I replaced the clutch I removed/replaced the exhaustI replaced the strap with a new one...Maybe if you Attach a Ground Strap that would fix the "odd arcing thing " goin on with you .Not a Clue,why it is Arcing either ,but it seems like maybe The strap was there for A Purpose?..For What I'm nOt sure.maybe some-one else Knows?..would be informative.LUck to ya Matty..DAVE/MrSTYX
#7
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I figured the entire exhaust would be grounded already since its bolted to the engine and its fully welded togeather? Also any clue to why it would only happen during cranking? My friend also said that the sparks were pretty thick and orange. for the rebuild i used the best parts out of 3 blown engines, and replace one of the housings with a used housing from ebay. IT was a great day yesterday, I replaced all seals except for the side seals and corner seals, and i replaced all springs, and Ported the engine myself using the racingbeat templates. a little starting fluid and she was growling back to life, I'll never forget it.
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Originally Posted by Hades12
I would say it is a bad ground to the starter.
Rich
#10
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Originally Posted by 64mgb
'd check the ground wire that runs from the battery to the frame and then to the engine just above the starter, as well as the ground strap on the rear of the exhaust...it connects to the rear muffler bracket .
Rich
Rich
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Originally Posted by Hades12
The engine ground is the one that goes to the starter bolt on the engine. Other then that the engine is not grounded to the car. All the other connection points have rubber in them.
Rich
#12
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my guess is the starter is shorting to ground. It's closest ground is the tranny > engine > exhaust > arcing you see at muffler.
try another starter, they're not expensive. even a junk yard one would be worth a try.
I'd also add a ground cable from engine to frame. Run it from a front cover bolt to the frame where battery goes. 2 gauge or thicker. Add another where muffler goes. That helped my voltage and battery charging too.
try another starter, they're not expensive. even a junk yard one would be worth a try.
I'd also add a ground cable from engine to frame. Run it from a front cover bolt to the frame where battery goes. 2 gauge or thicker. Add another where muffler goes. That helped my voltage and battery charging too.
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Originally Posted by DriveFast7
my guess is the starter is shorting to ground. It's closest ground is the tranny > engine > exhaust > arcing you see at muffler.
try another starter, they're not expensive. even a junk yard one would be worth a try.
I'd also add a ground cable from engine to frame. Run it from a front cover bolt to the frame where battery goes. 2 gauge or thicker. Add another where muffler goes. That helped my voltage and battery charging too.
try another starter, they're not expensive. even a junk yard one would be worth a try.
I'd also add a ground cable from engine to frame. Run it from a front cover bolt to the frame where battery goes. 2 gauge or thicker. Add another where muffler goes. That helped my voltage and battery charging too.
I really think that if the ground strap were connected to the tailpipe like it's supposed to be all would be good. I'm surprised that the arcing is as bad as it sounds like it is, but there's a reason they put a ground strap there.
Rich
#16
Burning Oil-Grinding 3rd
On mine the Ground has been on the engine side of the long bolt for the starter, The one that goes in from the engine side.
The exeaust is grounded to the engine and then the engine to the batt thrugh that one cable, So the one at the muffler should not really be needed.
The exeaust is grounded to the engine and then the engine to the batt thrugh that one cable, So the one at the muffler should not really be needed.
#18
Burning Oil-Grinding 3rd
Originally Posted by Jeff20B
How about this. The muffler is just held on by rubber things. If and when they fail, the strap is there to keep the muffler from dragging on the ground.
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The engine has inadequate grouding. you are correct that the exhaust system is grounded through the engine, so the only way that it would be sparking is if the engine did not have a good clean ground. Should be simple enough to check, just run another wire across from the motor to the - on the battery and see if it goes away...
#21
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Yea the grounds we an issue, it stopped arcing after its initial start up. I checked my plugs inbetween initial crankings and found that the were stuffed with vasoline. If this were the case, and i had poor engine grounding, i'd guess that all the enegry from the coils would just be ground to the engine, and then cause there were no good grounds, it would have made its way to the muffler, and then to the bumper to ground out. Its pretty screwed up, but makes sence. I added a 2 Gauge Ground strap to the top of the engine, and it runs much smoother. I Forgot to add any grounding to the engine after the install.
Thanks for your help guys
Thanks for your help guys
#22
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Good to hear you got her fixed man. I read a post by someone who was burning up throttle cables due to an engine grounding issue. That cable was the easiest route for the juice to take, but the cable couldn't take the heat. He went through a few of them before he figured it out...
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