Fire Ring Groove Depth?
- Thread starter satburn
- Start date
joefarmer
MR. Supreme Overlord
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5 BILLION THOUSANDTHS!!!
Doesn't the place you purchased the fire rings know? My old .020+ gasket measures .080" after installation. I would guess no more than .045" but I have no idea how much crush is in the firering material.
brnadon.
Doesn't the place you purchased the fire rings know? My old .020+ gasket measures .080" after installation. I would guess no more than .045" but I have no idea how much crush is in the firering material.
brnadon.
Red Stroke
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Well we cut the reciever groove .031 deep for the .105 diam rings.
satburn
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The ones I've crushed this time crushed .015 thou on the ring, with no distortion to the head gasket. The head gasket measures out around .084-.088 depending on where I measure. Either way I'm certain now that the first pass that was done on my head is no where near deep enough.
If you're cutting .031 for the .105s on a 20 over gasket, then all things considered I would cut a .051 for my .125s. So, if my math is right I'm looking at:
.125
- .085(ish) <-HeadGasket
- .051 <- Groove
----------
.011 crush
EDIT: No, no, no... God I'm so sick of this.
Ok, think! If I have a head and I set the ring on it and the ring is .125, then it has a protrusion of .125, now I counter sink it into the head with a groove measuring .051 and now it has a protrusion of .074, The head gasket is only .085(ish) thick, to start with, so pre-torqued my fire ring isn't touching and it sounds like post-torque it isn't touching either if it only crushes the head gasket to .080??? Sounds to me like the groove should be cut around .040, which would result in the head gasket and the fire ring sitting even to start with and crush them the same.
If you're cutting .031 for the .105s on a 20 over gasket, then all things considered I would cut a .051 for my .125s. So, if my math is right I'm looking at:
.125
- .085(ish) <-HeadGasket
- .051 <- Groove
----------
.011 crush
EDIT: No, no, no... God I'm so sick of this.
Ok, think! If I have a head and I set the ring on it and the ring is .125, then it has a protrusion of .125, now I counter sink it into the head with a groove measuring .051 and now it has a protrusion of .074, The head gasket is only .085(ish) thick, to start with, so pre-torqued my fire ring isn't touching and it sounds like post-torque it isn't touching either if it only crushes the head gasket to .080??? Sounds to me like the groove should be cut around .040, which would result in the head gasket and the fire ring sitting even to start with and crush them the same.
Last edited:
oil-burner
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according to haisley's
ring groove width = .120 wide make total groove dia .008 (+/-) .001 bigger than fire ring o.d. (example: 4.500" o.d. = 4.508")
ring compressed height = .090 (.015 compression of wire)
ring groove depth total = std. gasket .030-min .031-max
+.010 gasket .020-min .021-max
+.020 gasket .010-min .011-max
on high boost conditions = 12/24 valve std gasket .015-.016 groove-block
.015-.016 groove-head
12 valve .010 gasket .010-.011 groove-block
.010-.011 groove-head
12 valve .020 gasket .005-.006 groove-block
.005-.006 groove-head
scot
ring groove width = .120 wide make total groove dia .008 (+/-) .001 bigger than fire ring o.d. (example: 4.500" o.d. = 4.508")
ring compressed height = .090 (.015 compression of wire)
ring groove depth total = std. gasket .030-min .031-max
+.010 gasket .020-min .021-max
+.020 gasket .010-min .011-max
on high boost conditions = 12/24 valve std gasket .015-.016 groove-block
.015-.016 groove-head
12 valve .010 gasket .010-.011 groove-block
.010-.011 groove-head
12 valve .020 gasket .005-.006 groove-block
.005-.006 groove-head
scot
satburn
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- Feb 3, 2007
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- 789
Ok, but that still doesn't add up to me, I must be so tired that I'm not thinking clearly...
Your example appears to be about a .105 fire ring and I agree with the compression statement of .015 So if I further out your example and aproximate it to mine then here's what I think I have (we'll use max values).
.105 ring sunk into the head groove made .011 deep (I'm going with the +.020 gasket) = .094 protrusion and assuming that the gasket is .090, then we're looking at a .004 protrusion past the head gasket. Earlier it was stated that the gasket crushes .010 and the rings crush a max of .015, so OK THAT DOES MAKE SENSE!!!
Same scenario on my .125 wire, then I should cut a groove .031 max. .125 sunk into the groove = .094 protrusion and the rest of the math is the same
Yeah for me, I not a complete idiot! Thanks!
Your example appears to be about a .105 fire ring and I agree with the compression statement of .015 So if I further out your example and aproximate it to mine then here's what I think I have (we'll use max values).
.105 ring sunk into the head groove made .011 deep (I'm going with the +.020 gasket) = .094 protrusion and assuming that the gasket is .090, then we're looking at a .004 protrusion past the head gasket. Earlier it was stated that the gasket crushes .010 and the rings crush a max of .015, so OK THAT DOES MAKE SENSE!!!
Same scenario on my .125 wire, then I should cut a groove .031 max. .125 sunk into the groove = .094 protrusion and the rest of the math is the same
Yeah for me, I not a complete idiot! Thanks!