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Message started by Helio on 06/06/18 at 02:55:31

Title: Ignition Timing
Post by Helio on 06/06/18 at 02:55:31

good my friends
I have a question about the ignition point.
Not having the head mounted, the piston when it is in TDC point, the timing marks on the flywheel are correct, but as there are two TDC point, one in compression and the other in exhaust.
How do I know that tdc is in compression ???
(Is it possible that I can mount the head, be well mounted and keep sending the spark of the sail in TDC exhaust) Is it possible to correct?
Hence my question.
Sorry for english

Thank you

Hélio

Title: Re: Ignition Timing
Post by justin_o_guy2 on 06/06/18 at 03:00:20

The only difference is the cam position.
You decide which time it's exhaust and compression by the cam.

Get everything lined up and put it together with the cam lumps away from
away from the lifters. That's compression.

Title: Re: Ignition Timing
Post by Helio on 06/06/18 at 03:46:41

This is my confusion, if I'm going to mount everything right, and every two times that the piston comes to the TDC and the sparkle only gives 1 spark (in compression), how do I know I'm mounting on the compression TDC? ?

It must be just confusion in my head ...

Thank you

Title: Re: Ignition Timing
Post by verslagen1 on 06/06/18 at 07:33:33

The answer is... it simply doesn't matter.
The bottom doesn't care, TDC is TDC that's all it knows.
The top just cares that TDC is TDC and it sorts out when compression is.

Title: Re: Ignition Timing
Post by Fast 650 on 06/06/18 at 07:40:42

It will spark every rotation. Cam timing determines whether the spark ignites the fuel/air mixture or if it is a wasted spark.

Title: Re: Ignition Timing
Post by justin_o_guy2 on 06/06/18 at 07:46:08

d the sparkle only gives 1 spark (in compression),

Ahh, I didn't realize you were concerned about getting the sparkle plug to sparkle when the piston was up.
Our system is so crude that it sparkles every time the piston hits TDC, whether it's compression or not.

Title: Re: Ignition Timing
Post by batman on 06/06/18 at 08:09:04

The sparkplug fires every time the piston reaches TDC ,both on the compression stroke, and on the exhaust stroke, so you just need to place the piston at TDC and place the cam with the lobes down and the marks even ( or close depending on cam chain stretch) with the seam of the head ,and your good to go.

Title: Re: Ignition Timing
Post by Helio on 06/06/18 at 14:20:32

Dear friends, thank you very much for the explanation, now I am more rested and with no doubt in my head ..
Thank you all..
greetings;

Hélio