Checked timing and adjusted.... - Team Camaro Tech
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post #1 of 5 (permalink) Old Dec 22nd, 05, 11:57 AM Thread Starter
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robert
 
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Checked timing and adjusted....

Bought a great timing light today, it has a digital advance and shows the rpm, and it has a steel clamp instead of plastic.

My old ****ty timing light had a plastic clamp that melted away after hugging the header.

Anyway i first found the correct TDC and then i plugged the vacuum advance and set timing at 10 degrees BTDC, THEN i revved the engine and found the timing come in at 1300-1500 rpm at 36 degrees BTDC.

it didnt like idling at 10 degrees BTDC, ut hooking up the vacuum advance brought it to 25 degrees BTDC, it idles fine.

--Isnt 25 degrees BTDC too much while idling?
--I think going full advance at 1500rpm is too soon because if you rev it quick in neutral i hear some detonation.

What do you think about this?

BTW: its the 87 camaro in the SIG.

thank you

*RR*

Z28 1984
'77 355ci/COMP cam 218/224 .464/.470 114 LSA
rollerrockers1.5/9.72 forged pistons
ported '66 461 heads 1.94,1.5/Flowtech shorty headers
edelbrock 600/performer rpm intake
th350/shiftkit/hughes2500stall
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post #2 of 5 (permalink) Old Dec 22nd, 05, 12:12 PM
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Re: Checked timing and adjusted....

36 @ 1500 is way too fast. Check your advance wieghts and springs, maybe a spring came off?
25 at idle is not too much, may not even be enough, but I wouldn't mess with it before you get the mechanical advance under control. If it's pinging reving under no load, it'll ping bad when you try to drive it.





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post #3 of 5 (permalink) Old Dec 22nd, 05, 12:16 PM
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Re: Checked timing and adjusted....

error.

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Last edited by Gary L; Dec 23rd, 05 at 06:57 AM.
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post #4 of 5 (permalink) Old Dec 22nd, 05, 05:37 PM
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Re: Checked timing and adjusted....

Sounds like your vacuum advance is fine. 25* at idle is about right. As soon as you load the motor it should fall back closer to 10*. Check the busings on your advance weights and try a stiffer spring on one of the weights. Mechanical shouldn't be all in until somewhere between 2000 and 2500.

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post #5 of 5 (permalink) Old Dec 22nd, 05, 11:27 PM Thread Starter
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Re: Checked timing and adjusted....

thats what i thought!

the whole ignition is brand, spanking, shiny new, so it isnt worn out out or something, ill take a stiffer spring.

cya!

Z28 1984
'77 355ci/COMP cam 218/224 .464/.470 114 LSA
rollerrockers1.5/9.72 forged pistons
ported '66 461 heads 1.94,1.5/Flowtech shorty headers
edelbrock 600/performer rpm intake
th350/shiftkit/hughes2500stall
4th gen 3.23 10 bolt POSI.
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