Author Topic: IP timing- help needed with metric dial caliper (Read 3362 times)

haybayian · « **on:** May 20, 2008, 04:36:08 am »

Sorry guys for asking such a pedestrian question ( somewhat redface).

I am trying to set my IP timing and whereas I have no problem with the operation itself I don't know how to read the metric dial caliper named HOREX sold to me by Samstag Sales in the US. I am used to instruments in inches, but my imperial dial caliper is too wide and does not fit to the extension. Could anyone help with this metric thing.

Thanks.

Haybayian

flapjack · « **Reply #1 on:** May 20, 2008, 04:55:22 am »

1 inch = 2.54 cm

1 inch = 25.4 mm

inches X 25.4 = mm

haybayian · « **Reply #2 on:** May 20, 2008, 06:54:53 am »

Quote from: "flapjack"

1 inch = 2.54 cm

1 inch = 25.4 mm

inches X 25.4 = mm

My problem is not metric conversion but to make sense of the digits on the dial.
Thanks anyways.

zukgod1 · « **Reply #3 on:** May 20, 2008, 07:03:28 am »

So you have a metric dial then?

Timing set to 1mm lift?

What are you shooting for? As in what are you wanting to set the timing at.

gigaz2 · « **Reply #4 on:** May 20, 2008, 07:04:15 am »

you should post a picture of the dial then.

I also had a doubt about the setting, so if you post it it can be answered at the same time

flapjack · « **Reply #5 on:** May 20, 2008, 07:53:30 am »

tell us what the dial says. it usually says > < = .1 mm or something like that. Means each of the smallest marks on the dial = .1mm
One full rotation of the dial on mine = 2mm, so half a rotation = 1mm

haybayian · « **Reply #6 on:** May 20, 2008, 08:18:10 am »

Quote from: "flapjack"

tell us what the dial says. it usually says > < = .1 mm or something like that. Means each of the smallest marks on the dial = .1mm
One full rotation of the dial on mine = 2mm, so half a rotation = 1mm

The timing I am setting is that of the IP.

My dial is graduated from zero to 50 and has a smaller rotation number dial.
I ballparked the 2.5 mm preload.
Zeroed the dial + 1 mm preload. This dial seems to make two complete turns for one mm.
I figured that the hand should be back to the 24 to 34 reading on this dial.
What do you folks read when you complete the IP timing routine in metric?

Thanks for your time.

Haybayian.

Vincent Waldon · « **Reply #7 on:** May 20, 2008, 01:26:51 pm »

Sometimes in a case like this I find a way to test the theory... have you got something of a known thickness that you can measure and "teach" yourself how to read the screen ? Feeler gauge or spark plug gapper ??

I know I know... what's a spark plug. :wink:

rallydiesel · « **Reply #8 on:** May 20, 2008, 01:54:00 pm »

Each tick is .01mm for this one. So 2 revolutions would equal 1mm.

So after zeroing the gauge when the IP piston is fully retracted, the gauge should rotate exactly twice from your zero mark to TDC. That's kind of a weird gauge. Too precise really.

haybayian · « **Reply #9 on:** May 20, 2008, 05:12:31 pm »

Quote from: "rallydiesel"

Each tick is .01mm for this one. So 2 revolutions would equal 1mm.

So after zeroing the gauge when the IP piston is fully retracted, the gauge should rotate exactly twice from your zero mark to TDC. That's kind of a weird gauge. Too precise really.

That's the dial I have and...
I am beginning to get the picture.
Thanks you guys for taking the time to help.
Haybayian

haybayian · « **Reply #10 on:** May 20, 2008, 05:16:45 pm »

Quote from: "Vincent Waldon"

Sometimes in a case like this I find a way to test the theory... have you got something of a known thickness that you can measure and "teach" yourself how to read the screen ? Feeler gauge or spark plug gapper ??

I know I know... what's a spark plug. :wink:

Yes Vince, that's what I have done. The feeler gauge showed 0.5mm for a full rotation

Haybayian