Quench checking
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Teching In
Joined: Nov 2016
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Quench checking Ok. This is my first LS build. 6.0, howards cam, 317 heads from texas speed, stage 1.0, stock bottom end except for studs etc.
how do i check quench? I got a bridge tool the dial indicators, i need to figure how this is done.. ive built may engines but none where pistons come out of the hole. New to me! Once I figured this out i can degree the cam and move on with final assembly. .040 seems to be the number ppl look for on quench.. how do I find this?
thanks
how do i check quench? I got a bridge tool the dial indicators, i need to figure how this is done.. ive built may engines but none where pistons come out of the hole. New to me! Once I figured this out i can degree the cam and move on with final assembly. .040 seems to be the number ppl look for on quench.. how do I find this?
thanks
Last edited by Uglylspower; Aug 17, 2017 at 08:45 AM. Reason: Misspelled
Crankshaft Position Hi LSpower, UNDERSTAND that the LS crankshaft HAS 90* throws.
TWO pistons will be in MIDDLE stroke EQUAL distance from the deck, USE THESE for your TDC of #1 & #6.
Once TDC is found, measure the TDC piston's center (+ ???), then "rock" the piston LH/RN to the limit with measurement observed.
Provide that report here, many will help.
I like a .030" to .032" Squish
Lance
TWO pistons will be in MIDDLE stroke EQUAL distance from the deck, USE THESE for your TDC of #1 & #6.
Once TDC is found, measure the TDC piston's center (+ ???), then "rock" the piston LH/RN to the limit with measurement observed.
Provide that report here, many will help.
I like a .030" to .032" Squish
Lance
Thread Starter
Teching In
Joined: Nov 2016
Posts: 21
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Quench I indicated TDC, then set my two indicators at 0 on the deck, put them across the piston top and bottom and rocked piston back and forth. Is this what im looking for? And to i check every cylinder? This is an interesting thing to learn.
Squish preferences will vary greatly here among folks. .035" is safe with an aluminum engine. Using that number as an example for you, if your biggest number is, say .020" out of the hole, you'd look for a .055" head gasket. This would give you .035" squish.
The process is fun, and really only takes 15-20 minutes.
Thread Starter
Teching In
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Yes, use your deck bridge to find top dead center. Take your time and be very precise here. Once TDC is found, using the deck bridge, record how far out of the hole your piston is. Measure at 12 o'clock, and 6 oclock. Rock the piston carefully, until your measurements are the same, at 12 o'clock, and 6 o'clock. This is how far out of the hole you truly are. I write my numbers on the block deck with a sharpie. Do this on all 8 cylinders. You'll use the piston that is out of the hole the most, on each bank, to determine your head gasket thickness. Hopefully you'll have a flat deck. Make sure that piston tops are clear of carbon, and block deck is clean, hopefully freshly cut.
Squish preferences will vary greatly here among folks. .035" is safe with an aluminum engine. Using that number as an example for you, if your biggest number is, say .020" out of the hole, you'd look for a .055" head gasket. This would give you .035" squish.
The process is fun, and really only takes 15-20 minutes.
Squish preferences will vary greatly here among folks. .035" is safe with an aluminum engine. Using that number as an example for you, if your biggest number is, say .020" out of the hole, you'd look for a .055" head gasket. This would give you .035" squish.
The process is fun, and really only takes 15-20 minutes.
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Lance, top dead center, or "zero degrees" as you state, is found when the dial indicator on the deck bridge stops climbing, and begins to descend. This is with the deck bridge held firmly in place on the deck. This is the absolute most accurate way to find tdc with the heads off the engine.
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Verdad Gallardo Crankshaft Position Hi LSPower, your posted picture states the BEST Tech for LS members.
SO I ask, when you measure the piston position of the #3 AND #5 pistons FROM the deck, are they EQUAL ?
This is the BEST method to use for Crankshaft TDC position measurement AND just too simple !
This measurement is taken at TOP speed, when position change is greatest.
NOW, I mark the rear Crankshaft Flange AND the Oil Seal Cover for that observed TDC measurement, you WILL use this mark when you degree the Camshaft.
WHEN you "bridge" for TDC your resolution is 2* (4* camshaft) NOT GOOD.
NEXT, when the front pulley is installed, I mark the pulley/crankshaft with an electric pencil.
Then I MARK the Front Pulley OD to the Timing cover, a TDC alignment.
GM doesn't not provide this type of mark on OEM engines.
Lance
SO I ask, when you measure the piston position of the #3 AND #5 pistons FROM the deck, are they EQUAL ?
This is the BEST method to use for Crankshaft TDC position measurement AND just too simple !
This measurement is taken at TOP speed, when position change is greatest.
NOW, I mark the rear Crankshaft Flange AND the Oil Seal Cover for that observed TDC measurement, you WILL use this mark when you degree the Camshaft.
WHEN you "bridge" for TDC your resolution is 2* (4* camshaft) NOT GOOD.
NEXT, when the front pulley is installed, I mark the pulley/crankshaft with an electric pencil.
Then I MARK the Front Pulley OD to the Timing cover, a TDC alignment.
GM doesn't not provide this type of mark on OEM engines.
Lance
Hi LSPower, your posted picture states the BEST Tech for LS members.
SO I ask, when you measure the piston position of the #3 AND #5 pistons FROM the deck, are they EQUAL ?
This is the BEST method to use for Crankshaft TDC position measurement AND just too simple !
This measurement is taken at TOP speed, when position change is greatest.
NOW, I mark the rear Crankshaft Flange AND the Oil Seal Cover for that observed TDC measurement, you WILL use this mark when you degree the Camshaft.
WHEN you "bridge" for TDC your resolution is 2* (4* camshaft) NOT GOOD.
NEXT, when the front pulley is installed, I mark the pulley/crankshaft with an electric pencil.
Then I MARK the Front Pulley OD to the Timing cover, a TDC alignment.
GM doesn't not provide this type of mark on OEM engines.
Lance
SO I ask, when you measure the piston position of the #3 AND #5 pistons FROM the deck, are they EQUAL ?
This is the BEST method to use for Crankshaft TDC position measurement AND just too simple !
This measurement is taken at TOP speed, when position change is greatest.
NOW, I mark the rear Crankshaft Flange AND the Oil Seal Cover for that observed TDC measurement, you WILL use this mark when you degree the Camshaft.
WHEN you "bridge" for TDC your resolution is 2* (4* camshaft) NOT GOOD.
NEXT, when the front pulley is installed, I mark the pulley/crankshaft with an electric pencil.
Then I MARK the Front Pulley OD to the Timing cover, a TDC alignment.
GM doesn't not provide this type of mark on OEM engines.
Lance
The bridge method, when done correctly, will not have an error. It's a very precise, and certain way to find exact top dead center of a cylinder, with a quality micrometer.
I'm not sure why your using a mark that you've written on the rear cover to degree a crankshaft....
Maths Rule Hi 70, let us use YOUR MATH in YOUR FAVOR.
The 3.625" stroke Crankshaft WILL move the piston .125" from 88-92 degrees.
The Crankshaft position in that area (90* .ish) degrees/travel distance.
NOW divide by 100 = .00125 OK
Multiply by YOUR .004"-.005" measurement error = a 4X OR 4 x .00125 = .005". (YOUR TECH)
YOUR OWN MATH STATES a 1/4* possible error at 90* Crankshaft Position with YOUR .005". (YOUR MAX, YOUR TECH)
Lance
The 3.625" stroke Crankshaft WILL move the piston .125" from 88-92 degrees.
The Crankshaft position in that area (90* .ish) degrees/travel distance.
NOW divide by 100 = .00125 OK
Multiply by YOUR .004"-.005" measurement error = a 4X OR 4 x .00125 = .005". (YOUR TECH)
YOUR OWN MATH STATES a 1/4* possible error at 90* Crankshaft Position with YOUR .005". (YOUR MAX, YOUR TECH)
Lance
Hi 70, let us use YOUR MATH in YOUR FAVOR.
The 3.625" stroke Crankshaft WILL move the piston .125" from 88-92 degrees.
The Crankshaft position in that area (90* .ish) degrees/travel distance.
NOW divide by 100 = .00125 OK
Multiply by YOUR .004"-.005" measurement error = a 4X OR 4 x .00125 = .005". (YOUR TECH)
YOUR OWN MATH STATES a 1/4* possible error at 90* Crankshaft Position with YOUR .005". (YOUR MAX, YOUR TECH)
Lance
The 3.625" stroke Crankshaft WILL move the piston .125" from 88-92 degrees.
The Crankshaft position in that area (90* .ish) degrees/travel distance.
NOW divide by 100 = .00125 OK
Multiply by YOUR .004"-.005" measurement error = a 4X OR 4 x .00125 = .005". (YOUR TECH)
YOUR OWN MATH STATES a 1/4* possible error at 90* Crankshaft Position with YOUR .005". (YOUR MAX, YOUR TECH)
Lance
The 1/4 degree error is likely closer than relying on a miscut deck to find in the hole dimensions, like your using.
I'd bet that the wire sent out with most cam degreeing kits, that we bolt to the front of our blocks to point at the degree wheel, gives up more than a 1/4 of a degree of inconsistency.
I'm not gonna lose any sleep over 1/4 of 1 degree...
108 ILC Installed Hi Scott, OK the Intake Center Line of 108
Now lets set the cam specification 247/259 650"/.650" with a 111 C/L +3 advanced installed position.
This camshaft is a common request, recommended by many.
Your method ICL of 108 = OK
What do we call this Camshaft/Crankshaft position ?
Lance
Now lets set the cam specification 247/259 650"/.650" with a 111 C/L +3 advanced installed position.
This camshaft is a common request, recommended by many.
Your method ICL of 108 = OK
What do we call this Camshaft/Crankshaft position ?
Lance
Hi Scott, OK the Intake Center Line of 108
Now lets set the cam specification 247/259 650"/.650" with a 111 C/L +3 advanced installed position.
This camshaft is a common request, recommended by many.
Your method ICL of 108 = OK
What do we call this Camshaft/Crankshaft position ?
Lance
Now lets set the cam specification 247/259 650"/.650" with a 111 C/L +3 advanced installed position.
This camshaft is a common request, recommended by many.
Your method ICL of 108 = OK
What do we call this Camshaft/Crankshaft position ?
Lance
I've been doing this too long for you to play teacher with me.
Sorry Uglylspower!