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Author Topic: ring gap  (Read 1226 times)
dads67coupe
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« on: January 24, 2017, 10:48:07 am »

starting to file fit my rings for my 408w. recommended gap according to the math in the total seal booklet ends up at 26 thou.

Thats for the 150-300 shot (might spray it someday, figured gapping correctly now would save me in the long run)

does this seem correct?

bore (4.030) times .0065 comes out to .026195

thanks
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juiced coupe
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Location: Pascagoula, MS
The land mass between New Orleans and Mobile


« Reply #1 on: January 24, 2017, 11:49:08 am »

If it were me, I'd run more gap if I planned on a 300 shot. Around. 028-.030 top ring and. 032-.034 on the second sounds better.

I'm trying to remember how a particular engine builder I know phrased it concerning ring gaps and bearing clearances. A little too much and you know about it, but a little too tight and everyone knows about it.
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Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
dads67coupe
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« Reply #2 on: January 24, 2017, 12:09:10 pm »

Im only ever gonna run maybe 150 max. the instructions have 150-300 as a range. In reality it might only ever get 100 shot, or nothing at all....

Still put more gap to them?
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juiced coupe
Six figures worth of don't give a f*ck
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Location: Pascagoula, MS
The land mass between New Orleans and Mobile


« Reply #3 on: January 24, 2017, 01:09:43 pm »

At 100-150, .026 should be fine on the top ring. I'd run the second ring about. 004 looser to reduce the chance of flutter.
Logged

Doing more with less, or something like that.
http://sbftech.com/index.php/topic,20009.0.html

Quote from: Monte Smith
Bottom line, if it was the hot ticket, the fast guys would do it.............they don't

You might need some Titanium rods and a flow bench!  LMAO on floor

I honestly don't get it.

I'm sweating, my heart is racing, my clutch foot is twichin', and my right arm punched the computer screen doing an involentary 2-3 shift while reading all that. 
dads67coupe
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***
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Posts: 165

Location: Littleton NH

« Reply #4 on: January 24, 2017, 02:12:48 pm »

thanks again sir
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dads67coupe
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Location: Littleton NH

« Reply #5 on: January 24, 2017, 04:48:11 pm »

Just for my own knowledge, can you explain "flutter" still learning alot of this stuff

EDIT: just read up on ring flutter, I think I'll open the bottom gaps up 3-4 thou tomorrow

I measured the gaps about a inch in the bore, used a locked caliper to square the ring in the bore. Should I be measuring deeper in the hole, or is about an inch sufficient. its a fresh bore
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