Tells us about those Tricks Of The Trade

themoose · Feb 16, 2013

Most everyone has some helpful hints that make doing a difficult or tedious job easier. If you do something often enough you'll most likely find a better way of doing it than the guy who only does it once in a whileI guess they call it Tricks Of The Trade. If you have any helpful hints of shortcuts post them here so we can all benefit from your expertise.

[FONT=&quot] Ill start with one that Ive found to be helpful when trying to drill a hole in the center of a bolt or a small piece of round stock .I[/FONT]f you've ever tried to drill a hole this way, you know how difficult it is to get the hole in the center all the way through the stock. This method makes it easy you could even do it with a hand drill! Center punch the stock and then put it into a vice and very carefully start the drill at the center point. You don't have to drill very deep, just enough to adequately start the hole. Now un-clamp the round stock from the vice, and remove the drill bit from the drill. Place the round stock in the in the drill chuck, and place the drill in the vice. Now with the stock spinning, and the drill bit securely fastened in the vice, carefully mate the two surfaces once again. As the hole cuts, an amazing thing happens, the drill is self aligned as it proceeds through the bolt. The reason is that any angular error, is subtracted out of the equation every 180 degrees of rotation

thedreamer · Feb 16, 2013

Great advice. I have nothing.

Graham M · Feb 16, 2013

I remember there were a few threads about this before.

here is one for sure that comes to mind
http://www.jalopyjournal.com/forum/showthread.php?t=435410&highlight=mentor+taught

themoose · Feb 16, 2013

Graham M said: ↑

I remember there were a few threads about this before.

here is one for sure that comes to mind
http://www.jalopyjournal.com/forum/showthread.php?t=435410&highlight=mentor+taught
Click to expand...

So you have nothing new?

325w · Feb 16, 2013

Angular error. I will have to google that ?

elba · Feb 16, 2013

How to figure compression ratio is easy. This works at sea level and must be calculated for higer altitudes. Get your compression gage and do a check on the engine. For example if you get 147 psi, divide by 14.7 and you get 10. Compression ratio is 10:1
If your compression is 176, divide by 14.7 and you have a 12:1 compression ratio.
I saw this in an old mag long time ago. So simple.

themoose · Feb 17, 2013

325w said: ↑

Angular error. I will have to google that ?
Click to expand...

Angular error describes the magnification of angle error over distance. For example, when one measures a point that is 1 meter away at 45 degrees, an angular error of 1 degree corresponds to a positional error of over 1.745 cm, equivalent to a distance-measurement error of 1.745%. In machine design, some components are particularly sensitive to angular errors. For example, if the shaft of a lathe is angled slightly, the part will have errors in diameter far down the part.

saltflats · Feb 17, 2013

When working on old suspension parts that ar rusted and stuck or anything of the nature use a big hammer like 64 oz. and hit the stuff smartly if you use a small hammer you wil just mushroom the part and not generate enuff energy to get the pert moving.

chubbie · Feb 17, 2013

elba said: ↑

How to figure compression ratio is easy. This works at sea level and must be calculated for higer altitudes. Get your compression gage and do a check on the engine. For example if you get 147 psi, divide by 14.7 and you get 10. Compression ratio is 10:1
If your compression is 176, divide by 14.7 and you have a 12:1 compression ratio.
I saw this in an old mag long time ago. So simple.
Click to expand...

wow! interesting.....thinking about this, compression ratio is a "RATIO" it is 1 increment to 10 more at BDC would be 10 to 1 CR. and you can get this by takeing a compression test? thats a test of good valve seal and rings. I've argued the point with the guys that tell me you bore out an engine you get a higher compression ratio, and i've never won the argument!

DD COOPMAN · Feb 17, 2013

elba said: ↑

How to figure compression ratio is easy. This works at sea level and must be calculated for higer altitudes. Get your compression gage and do a check on the engine. For example if you get 147 psi, divide by 14.7 and you get 10. Compression ratio is 10:1
If your compression is 176, divide by 14.7 and you have a 12:1 compression ratio.
I saw this in an old mag long time ago. So simple.
Click to expand...

Oh really? I'm not quite convinced...yet! I understand the correlation between 14.7 and sea level, but I'm wondering if you understand what the term "compression ratio" actually means. Please convince me that I'm incorrect. DD

saltflats · Feb 17, 2013

I was woundering about this C/R thing because you can change cam timing and it will change the reading in a compression gauge.

31Vicky with a hemi · Feb 17, 2013

elba said: ↑

How to figure compression ratio is easy. This works at sea level and must be calculated for higer altitudes. Get your compression gage and do a check on the engine. For example if you get 147 psi, divide by 14.7 and you get 10. Compression ratio is 10:1
If your compression is 176, divide by 14.7 and you have a 12:1 compression ratio.
I saw this in an old mag long time ago. So simple.
Click to expand...

DD COOPMAN said: ↑

Oh really? I'm not quite convinced...yet! I understand the correlation between 14.7 and sea level, but I'm wondering if you understand what the term "compression ratio" actually means. Please convince me that I'm incorrect. DD
Click to expand...

This needs its own thread .
There's ways to come close with a compression gauge, while cranking or a running compression test. There's charts available that say what you should have. The divide by ten is way off for calculations. Bit more math involved

Paul · Feb 17, 2013

for threading round stock

find a tube just big enough to slip the round stock into with little or no slop
take a long bolt of the same diameter as the round stock and of the desired thread
chop the tube just shorter than the bolt
run the bolt through the tube and into the thread die
carefully tack the tube to the die
remove the bolt
you now have a guide aligned with the thread cutters in the die for nice straight threading

edit: crappy out of focus pictures added
1/2" x 1/16" square tube tacked to 3/8 nf die and threaded 3/8 round stock

theHIGHLANDER · Feb 17, 2013

elba said: ↑

How to figure compression ratio is easy. This works at sea level and must be calculated for higer altitudes. Get your compression gage and do a check on the engine. For example if you get 147 psi, divide by 14.7 and you get 10. Compression ratio is 10:1
If your compression is 176, divide by 14.7 and you have a 12:1 compression ratio.
I saw this in an old mag long time ago. So simple.
Click to expand...

So when I read 220 on a 472 Cad it was 15:1? Sorry, this is wrong. OEM spec was 10.5:1.

chubbie said: ↑

. I've argued the point with the guys that tell me you bore out an engine you get a higher compression ratio, and i've never won the argument!
Click to expand...

You won't win the argument. Bore size is a function of "swept volume". Increase the bore, leave all else the same, you've increased the swept volume. That in turn increases the compression. Swept volume + chamber volume + gasket volume, etc.

In both cases, this only STATIC compression ratio. What you actually use can be different based on cam overlap and degrees of duration. And of course cylinder sealing.

lht · Feb 17, 2013

i chuck it up in the lathe it drills it perfectly centered everytime

Waddayacare · Feb 17, 2013

For small block Chevys - Common problem - Excessive cam gear to block wear:

Drill a 1/16" hole in the block at the contact point of the cam gear. The hole will drill into an oil passage allowing a trickle of oil to lubricate the mating surfaces reducing friction and excessive wear.

foolthrottle · Feb 17, 2013

masking tape/ duct tape on the end of a wrench for those hard to start nuts,(early hemi flywheel)

chubbie · Feb 17, 2013

theHIGHLANDER said: ↑

So when I read 220 on a 472 Cad it was 15:1? Sorry, this is wrong. OEM spec was 10.5:1.

You won't win the argument. Bore size is a function of "swept volume". Increase the bore, leave all else the same, you've increased the swept volume. That in turn increases the compression. Swept volume + chamber volume + gasket volume, etc.

In both cases, this only STATIC compression ratio. What you actually use can be different based on cam overlap and degrees of duration. And of course cylinder sealing.
Click to expand...

here i go again!!! LOL!! compression, and compression ratio are 2 different things

theHIGHLANDER · Feb 18, 2013

chubbie said: ↑

here i go again!!! LOL!! compression, and compression ratio are 2 different things
Click to expand...

I enjoy friendly theoretical discussions, but some punctuation would help. We may be saying the same thing, we may be talking about 2 different things. We can only calculate the static comp ratio when servicing or modifying. With some serious math we can calculate dynamic compression but it's not serious enough to try.

Back on topic.

For sanding/blocking primer many like guide coats. You often see the splatter of a the rattle can stuff, then there's the powdered stuff from 3M that's even better, but none are better than tinting the last coat of primer. On things that require an ultimate finish, I reduce the last coat considerably and either use a different color primer or tint that last coat darker. Nothing, and I mean NOTHING gets by that approach from the smallest pinhole to the finest scratch. It takes the work out of one of the hardest jobs in refinishing.

themoose · Feb 18, 2013

Some good tips here guys.....Lets see some more!!

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Graham M
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from Calgary AB

themoose
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from Connecticut

Connecticut HAMB'ers

HAMB Old Farts' Club

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Primeval Chevy Disciples

325w
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from Arlington, Texas

North Texas HAMBers

Tarrant County Social Club

elba
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from Samson, ALabama

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HAMB Old Farts' Club

Termites and Bowties

Primeval Chevy Disciples

saltflats
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from Missouri

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from Lake Houston

saltflats
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Paul
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lht
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