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General Tech Talk

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Post by hillbilly »

If I remove number 1 spark plug , is t.d.c the position of the piston
when at the top of the bore?? 5l holden motor.

cheers.
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Post by jeep97tj »

Yep your right, It will be at the top, What are u doing? If u are seting up the spark timing make sure both valves are closed aswell.
Shane
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Post by 360 scout »

be aware that the piston will be at TDC for several degrees of crankshaft rotation so not real acurate if referencing off the crank there are several other methods which are more accurate .
TOYOTAS ARE LIKE TAMPONS!! every pussie has one!


Nitrous is like a hot chick with an STD...You know you want to hit it...Your just afraid of the consequences
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Post by hillbilly »

Tried using a dial gauge, and when the piston hit top , figured that was it. Did not keep turning the crank when the gauge stopped climbing. Is this right?
From there, is it just adjusting the dizzy to get the correct timing?






.
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Post by F'n_Rover »

hillbilly wrote:Tried using a dial gauge, and when the piston hit top , figured that was it. Did not keep turning the crank when the gauge stopped climbing. Is this right?
From there, is it just adjusting the dizzy to get the correct timing?






.
Fark, if you just want to find TDC for static timing - just stick your finger in the hole and wait for the pressure to stop. No need for super accuracy.
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Post by jeep97tj »

hillbilly wrote:Tried using a dial gauge, and when the piston hit top , figured that was it. Did not keep turning the crank when the gauge stopped climbing. Is this right?
From there, is it just adjusting the dizzy to get the correct timing?
.
It will be close enough to start, but yer a screw driver down the plug hole would of been just as good. U will still have to adj it from there though with a timing light. Did u make sure u were at the top of the compression stroke and not the top of the inlet or exhaust stroke? U have to read the cam when setting up the dizzy other wise it will just back fire and not start.
Shane
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Post by hillbilly »

I have to read the cam when setting up the dizzy???
I don't understand.
Please explain.
Cheers.
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Post by F'n_Rover »

hillbilly wrote:I have to read the cam when setting up the dizzy???
I don't understand.
Please explain.
Cheers.
You want the spark to happen on the compression cycle not the exhaust cycle. Just do the finger thing, don't have to worry about the cam then.
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