OP
@chandlerman avatar
UTC

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate
Joined: UTC
Posts: 9393
Location: Nashville

118 Days Since Last Explosion
 
Lucky
@chandlerman avatar
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate
Joined: UTC
Posts: 9393
Location: Nashville

118 Days Since Last Explosion
UTC quote
So far as I know, credit for the idea of using an inclinometer goes to Scooter Republic, the Buzzwangle inventors.

Now a decent inclinometer is pretty cheap, like $25 on Amazon. But the CNC'ed attachment tool they provide, along with the piston stop, which is redundant for me, made it hard to justify the cost.

What I did instead is tape a neodymium magnet to the back of my inclinometer, stick that to the flywheel, and do it that way.

For whatever reason, I decided to work this out to deal with checking the Sprint's timing over the weekend and once I sorted it, the entire process took about two minutes, plus no messing with attaching paperclips to the cases, sucking my printed degree wheel into the flywheel (yeah, I've done that before), or any other complexity. And as an added bonus, the arithmetic is easier, too.

Here's my specific technique, with pictures, and happy timing, everyone!
Step 1:  Install the piston stop, rotate the flywheel clockwise until it contacts the stop, then attach the inclinometer
Step 1: Install the piston stop, rotate the flywheel clockwise until it contacts the stop, then attach the inclinometer
Step 2:  Zero the attached inclinometer
Step 2: Zero the attached inclinometer
Step 3:  Rotate the piston counter-clockwise until it hits the stop again.  Add 90 to this value.  This is the number of degrees between the two piston stopping points.  So in my case, 136.9 degrees.
Step 3: Rotate the piston counter-clockwise until it hits the stop again. Add 90 to this value. This is the number of degrees between the two piston stopping points. So in my case, 136.9 degrees.
Step 4:  Divide the value from Step 3 by two (137 / 2 = 66.5).

Remove the piston stop and rotate the flywheel to 66.5
Step 4: Divide the value from Step 3 by two (137 / 2 = 66.5). Remove the piston stop and rotate the flywheel to 66.5
And you have TDC!
And you have TDC!
Bonus pic:  evidence I can duct tape things together, as if there was any doubt about that! ;)
Bonus pic: evidence I can duct tape things together, as if there was any doubt about that! ;)
@gt6mk3 avatar
UTC

Hooked
Bodgerific 150 Super, PX200(ish...), US 50 Special in progress
Joined: UTC
Posts: 478
Location: Melbourne, Way Downunder
 
Hooked
@gt6mk3 avatar
Bodgerific 150 Super, PX200(ish...), US 50 Special in progress
Joined: UTC
Posts: 478
Location: Melbourne, Way Downunder
UTC quote
Re: Finding TDC with an Inclinometer
chandlerman wrote:
duct tape
Where's the beer?
@ginch avatar
UTC

Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8595
Location: Victoria, Australia
 
Veni, Vidi, Posti
@ginch avatar
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8595
Location: Victoria, Australia
UTC quote
I did something similar, but the meter I bought only goes to 90 degrees then back to zero. How did you pick one that keeps going like that?
OP
@chandlerman avatar
UTC

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate
Joined: UTC
Posts: 9393
Location: Nashville

118 Days Since Last Explosion
 
Lucky
@chandlerman avatar
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate
Joined: UTC
Posts: 9393
Location: Nashville

118 Days Since Last Explosion
UTC quote
Mine also goes to 90 degrees, then starts telling me how far below level I am. That's why I add 90 degrees to the value at the counter-clockwise piston stop measure.
UTC

Hooked
P200e
Joined: UTC
Posts: 129
Location: Eureka, Ca
 
Hooked
P200e
Joined: UTC
Posts: 129
Location: Eureka, Ca
UTC quote
I downloaded an app to my Samsung phone that does this exact thing. For free. I'm thinking double stick tape on the back of the phone
UTC

Hooked
P200e
Joined: UTC
Posts: 129
Location: Eureka, Ca
 
Hooked
P200e
Joined: UTC
Posts: 129
Location: Eureka, Ca
UTC quote
Re: Finding TDC with an Inclinometer
Gt6MK3 wrote:
chandlerman wrote:
duct tape
Where's the beer?
In my belly
OP
@chandlerman avatar
UTC

Lucky
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate
Joined: UTC
Posts: 9393
Location: Nashville

118 Days Since Last Explosion
 
Lucky
@chandlerman avatar
76 Sprint V, 63 GL, 62 VBB, 05 Stella, 66 Smallstate
Joined: UTC
Posts: 9393
Location: Nashville

118 Days Since Last Explosion
UTC quote
Iamthegump wrote:
I downloaded an app to my Samsung phone that does this exact thing. For free. I'm thinking double stick tape on the back of the phone
But how will you take pictures of your project, then?
@ginch avatar
UTC

Veni, Vidi, Posti
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8595
Location: Victoria, Australia
 
Veni, Vidi, Posti
@ginch avatar
74 Super, 75 Super, PX project, LML off-roader and '66 Blue Badge Smallframe
Joined: UTC
Posts: 8595
Location: Victoria, Australia
UTC quote
chandlerman wrote:
Mine also goes to 90 degrees, then starts telling me how far below level I am. That's why I add 90 degrees to the value at the counter-clockwise piston stop measure.
Cheers Chandlerman! Mathematics to the rescue again!
@gravelrash2004 avatar
UTC

Addicted
P Series / Li / LML / Motobi
Joined: UTC
Posts: 511
Location: UK - 3rd Rock From the Sun
 
Addicted
@gravelrash2004 avatar
P Series / Li / LML / Motobi
Joined: UTC
Posts: 511
Location: UK - 3rd Rock From the Sun
UTC quote
Iamthegump wrote:
I downloaded an app to my Samsung phone that does this exact thing. For free. I'm thinking double stick tape on the back of the phone
a link or an app name would be good..!

i have a spare old samsung with not much to do apart from play spotify/deezer

kudos to the OP for this creative cost saving measure
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