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Bore Gauge, Micrometer, Plastigauge
#1
I spent roughly 7 hours over the past 2 weekends blueprinting my crankshaft, engine block, and connecting rods.

A large part of that time was just setting up the measuring devices, learning, screwing up, learning, screwing up, and learning some more. If I had a machine shop, I would just have tools on the shelf ready to go for the job. But, such is not the case of a 2 car garage mechanic. I also took the time to compare the plastic alternative(plastigauge) to mechanical measuring. Anything for you guys.

In the end, I am convinced my machinists did an unbelievable job on my motor as all measurements were consistent to the specs- dead in the middle of the tolerances.

Also, at least for me, the plastigauge worked/compared perfectly to the measurements I took. Perhaps this will encourage other builders here to test the plastigauge themselves.

I write up will be forthcoming, ENGINE BLUEPRINTING FOR NON/SLIGHTLY INTERESTING ENGINE BUILDERS, but for those who are in the process, decide on your own about the plastigauge. I have lots of plastigauge left.

And, for the record I used a FOWLER Bore Gauge, +/- .01mm=.000394 inches...don't remember the micrometer brand, but it was Japanese. (More on why you SHOULD consider metric devices in a later post)

The tools were borrowed. Otherwise I was looking at $450+. If you are going to use mechanical measuring devices, you should give yourselves a couple of weeks to procure them. I was looking for 3 weeks without any luck. I was hoping to buy a gauge and then resell to recoup my cash.

Later.

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
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#2
What the hey were you doing 17 months ago when I was ordering Plastigauge by the gross and had to take a 5 month sabbatical from 7173mustangs just to keep my moroseness off the forum?? Huh?? Heck, they sent out the Milk Carton guys to find me, which explains why I'm even posting today.

And trying to borrow a Vernier scale to balance things, without raising eyebrows, is a trick in itself. Especially without a medical card.

Best wishes with your blueprint, Mr. Johnny-Come-Lately. Being hows your within only 3 or 4 tanks of gas away from Winnemucca, I might have to pay you a visit. I'll be at the train station in downtown LA on December 21 at 2:17AM. Hope to see you there.

Doc

[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided
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#3
73vertproject;101534 Wrote:.... I'll be at the train station in downtown LA on December 21 at 2:17AM. Hope to see you there.

I am the guy sleeping on the bench with an LA Times over my head. Don't be afraid to wake me up as I may dose off by 2:17am.

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
  Reply
#4
Wolverine;101546 Wrote:
73vertproject;101534 Wrote:.... I'll be at the train station in downtown LA on December 21 at 2:17AM. Hope to see you there.

I am the guy sleeping on the bench with an LA Times over my head. Don't be afraid to wake me up as I may dose off by 2:17am.

Tongue The wife and I are taking a Pacific Coast train trip for Christmas. We're supposed to arrive in LA on the 21st at 2:17AM, and we'll be in LA until we leave for Seattle on the morning of the 23rd. If I see you I'll give you a nudge and buy you a cup of coffee. Smile

Doc

[Image: 6y14ea.jpg]

Project started 8-7-10
Completed: All new suspension, rebuilt 351C H Code bored .030 over with mild cam and intake, new 3.50 TracLok, custom exhaust system
Current "mini-project": interior upgrade Undecided
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#5
They have a train station in Lower AlabamaHuh
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#6
Tnfastbk;101579 Wrote:They have a train station in Lower AlabamaHuh
Only at UCLA: Upper Corner, Lower Alabama aka Mobile.

Let me check your shorts!
http://midlifeharness.com

[Image: Flamicon2.jpg]


[Image: oldfart.png]
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#7
And here I thought I was going to find out plastigauge was why I keep blowing up motors! Damn!

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
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#8
marks73;101656 Wrote:And here I thought I was going to find out plastigauge was why I keep blowing up motors!

It's hard to keep the attention of these young generation people. 3 or 4 posts is all the time you have to make your point.

Getting back to the plastigauge, maybe you did not remove the plastigauge?

Plastigauge has been used for YEARS by many people. My engine consultants, 2 of them, have used plastigauge to check their machine shop contractors work for 30+ years, 50-75 motors. They still use it today.

Neither of my consultants thought of using a micrometer to measure the crank with the plastigauge on it. They too are curious of my results.

Of course, my results are not scientific. But they are interesting.

So, go ahead and commit yourself to an answer: Did the measurement of the crank + plastigauge give a reasonable measurement of bearing clearance?

[Image: 11jmcuc.png]
351C Bold Manners, Brash Attitude
Favorite Teams: Michigan Wolverines and Whoever Is Playing Ohio State.

When I drive past a herd of cows, the cows MOO at me
  Reply
#9
A. I've trusted plastigauge for years but only after like you verifying with my dads Sterret because he didn't believe it worked either.
B. What if's are what make GREAT motors.
C. I've never blown an engine but have paid a bad machine shop to show me how it's done.
D. Should have always listened to Dad because if I had and checked myself. C never would have happened.

[Image: 2rr7aiv.png]

Just cruising along minding our own business when BAM!!! The LAWS show up.
  Reply
#10
So basically you want to reinvent the wheelHuh
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