#1 plug...........clean with spark??? - Chevelle Tech
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post #1 of 10 (permalink) Old Jul 8th, 07, 7:49 PM Thread Starter
 
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#1 plug...........clean with spark???

alright guys i just replaced my plugs with m.sd super cond. and put in brand new plugs to try to solve this mystery and some mild popping...... recently went to a comp magnum 286 cam with matching components. added some 781 heads and a 6al box to my 10 to 1 468, everything went well. but now i have this clean #1 plug deal?? with spark?? im confused .......the car still runs strong and if you pull the plug wire all together theres no change in idle. a plug and wire change solved the popping .


468
781 heads
edelbrock dual plane intake
750 demon
magnum 286 comp cam
headers
msd 6al
mallory 85 series dist.

thanks guys
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post #2 of 10 (permalink) Old Jul 8th, 07, 8:43 PM
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Frank
 
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Re: #1 plug...........clean with spark???

I'm confused about your question. Are you asking why is the spark plug still clean even when it appears to be burning fuel?

Your second question about idle speed being unaffected by a disabled plug might be answered by the amount of rotating mass in a 468. The torque from the other seven cylinders can compensate for the loss of one spark plug at idle.

-Frank
1970 Chevelle Malibu purchased new in 1970
355 SBC, XE262H cam, Performer RPM heads, MSD HEI, TH200-4R trans, 3.55:1 Posi, digital gauges, QA1 coilovers
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post #3 of 10 (permalink) Old Jul 8th, 07, 9:03 PM Thread Starter
 
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Re: #1 plug...........clean with spark???

no it appears to be brand new and burning no fuel............with spark going to it...........sorry for the confusion.
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post #4 of 10 (permalink) Old Jul 9th, 07, 6:41 AM Thread Starter
 
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Re: #1 plug...........clean with spark???

btt....................
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post #5 of 10 (permalink) Old Jul 9th, 07, 9:28 AM
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Re: #1 plug...........clean with spark???

Run a compression test.
Mike
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post #6 of 10 (permalink) Old Jul 9th, 07, 10:53 AM
 
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Re: #1 plug...........clean with spark???

Is the engine losing coolant? A blown head gasket or cracked head, leaking coolant into a cylinder will also "Steam clean" that cylinder and plug. I hope this is not the case, but it does happen. When I replaced the blown head gasket on my 377 a few years ago, cylinders 4 and 6 were clean as a whistle. Do a compression test.
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post #7 of 10 (permalink) Old Jul 9th, 07, 11:10 AM
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Re: #1 plug...........clean with spark???

It's been my experience that a spark plug that hasn't been firing will be just the opposite of "clean"
They're usually very fouled and full of black oil.

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post #8 of 10 (permalink) Old Jul 9th, 07, 6:26 PM Thread Starter
 
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Re: #1 plug...........clean with spark???

allright guys i just went and pulled my valve cover and found the prob. # 1 intake valve now measures 2 in. and 7/16 installed height instead of the 1.9 it was originally?? ( or suppose to be) .........and is loose as hell!! what happened?? im not sure......i didnt drop a valve ( thank god ) im running comp double springs and 10 deg. locks and retainers. can this happen or did i just forget to measure that spring when i got the heads back?? do i gotta pull the head? .............more machine work?? help me out here im stressin.
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post #9 of 10 (permalink) Old Jul 9th, 07, 10:01 PM
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Re: #1 plug...........clean with spark???

Quote:
Originally Posted by 64malss468 View Post
allright guys i just went and pulled my valve cover and found the prob. # 1 intake valve now measures 2 in. and 7/16 installed height instead of the 1.9 it was originally?? ( or suppose to be) .........and is loose as hell!! what happened?? im not sure......i didnt drop a valve ( thank god ) im running comp double springs and 10 deg. locks and retainers. can this happen or did i just forget to measure that spring when i got the heads back?? do i gotta pull the head? .............more machine work?? help me out here im stressin.
Well..that .5375" came from somewhere.Yank the head.The valve seat may have failed and gosh only knows where it went and what the valve head did to the casting.

George

8-71 blown 461 Rat on E-85
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post #10 of 10 (permalink) Old Jul 9th, 07, 10:29 PM Thread Starter
 
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Re: #1 plug...........clean with spark???

i know it............ the machine work has about 50 mi. on it.......................what a pain in the ass. thanks fellas
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