Tore the motor back down......H-o-l-y shit
10-20-2002, 02:50 AM
#1
Tore the motor back down......H-o-l-y **** Well, took the motor back apart to investigate this little nightmare. Definately not good news by any means....
First off, I think my motor is the only LS1 in existance to break 4 hardened pushrods. Yes, when I say break, I mean they came out in two pieces. The pushrods were broken on cyl. 3,6,2, and 4. When I found this, I thought maybe the chain was binded and broke upon start up and smacked some valves. Umm, nope. Chain is perfectly in place, cam and crank still line up dot to dot. Needless to say a few of the valves are trashed, and the heads.
With everything lined up correctly, can one explain how this could actually happen? The only place to point the finger would be piston/valve clearance. I am trying to run a B1 cam, and I had the heads milled .050. Should be plenty of clearnace there, unless I was sent the wrong cam or the shop milled my heads wrong. Thats about the only way you can explain breaking pushrods with everything else in the valvetrain looking cosher. I haven't pulled the cam yet to check it, but I trust that the person I bought it from sent the correct one.
This situation sound familiar to anybody?
Josh
First off, I think my motor is the only LS1 in existance to break 4 hardened pushrods. Yes, when I say break, I mean they came out in two pieces. The pushrods were broken on cyl. 3,6,2, and 4. When I found this, I thought maybe the chain was binded and broke upon start up and smacked some valves. Umm, nope. Chain is perfectly in place, cam and crank still line up dot to dot. Needless to say a few of the valves are trashed, and the heads.
With everything lined up correctly, can one explain how this could actually happen? The only place to point the finger would be piston/valve clearance. I am trying to run a B1 cam, and I had the heads milled .050. Should be plenty of clearnace there, unless I was sent the wrong cam or the shop milled my heads wrong. Thats about the only way you can explain breaking pushrods with everything else in the valvetrain looking cosher. I haven't pulled the cam yet to check it, but I trust that the person I bought it from sent the correct one.
This situation sound familiar to anybody?
Josh
10-20-2002, 08:41 AM
#4
Re: Tore the motor back down......H-o-l-y **** Josh....I am running the T1 with .050 mill on my heads with no issues. I believe the 2 cams are the same except for LSA. Had the heads been milled before? If so, the machine shop may have milled an "additional .050"?
On a good note...the TNT kit is on and working fine <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
On a good note...the TNT kit is on and working fine <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />
10-20-2002, 09:13 AM
#5
Re: Tore the motor back down......H-o-l-y **** I'd check your pistons out real well if the valves hit them hard enough to break all those hardened pushrords. A friend had the unfortunate experience of having on of the nuts for his FTRA getting sucked into the motor while racing W/O and air cleaner. Took the heads off checked everything out and swapped another set on. Turns out one of the pistons had a crack in it and when they took it down the street. Kaboom. <img border="0" alt="[kaboom]" title="" src="graemlins/gr_bomb.gif" /> Better safe than sorry.
Bruce
Bruce
10-20-2002, 11:24 AM
#6
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Re: Tore the motor back down......H-o-l-y **** Sounds like the heads are milled more than you anticipated..... Measure and compare to stock. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />
10-20-2002, 11:46 AM
#7
Re: Tore the motor back down......H-o-l-y **** </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Josh....I am running the T1 with .050 mill on my heads with no issues. I believe the 2 cams are the same except for LSA. Had the heads been milled before? If so, the machine shop may have milled an "additional .050"?
On a good note...the TNT kit is on and working fine </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Todd, thats what I figured. I believe I emailed you a while back asking about clearance, and you told me your setup. I also spole with Jayson @ MTI, Raughammer, Patrick G, and a couple of other guys with highly decked heads. All said I was good to go. My guy swears that the machine was setup correctly for the milling, but as of now I do not think so. Glad to hear the TNT kit is working for you, let me know how it runs..
I will check for cracks tonight <img border="0" alt="[Banging Head]" title="" src="graemlins/gr_banghead.gif" />
On a good note...the TNT kit is on and working fine </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Todd, thats what I figured. I believe I emailed you a while back asking about clearance, and you told me your setup. I also spole with Jayson @ MTI, Raughammer, Patrick G, and a couple of other guys with highly decked heads. All said I was good to go. My guy swears that the machine was setup correctly for the milling, but as of now I do not think so. Glad to hear the TNT kit is working for you, let me know how it runs..
I will check for cracks tonight <img border="0" alt="[Banging Head]" title="" src="graemlins/gr_banghead.gif" />
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10-20-2002, 01:30 PM
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Re: Tore the motor back down......H-o-l-y **** </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Country Boy:
<strong>Was #1 at TDC. Now #1 has 2 different TDCs. It has to be TDC on the compression stroke, not the exhaust stroke! Thats the ONLY way to have your problem! Piston hit valves... PERIOD. Valves dont hit themselves.
I bet $$$ that you didnt have TDC on the right stroke.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That wouldn't have an impact on valve clearance if it was set dot-to-dot. The Camshaft is what decides what stroke you are on. If you unbolt the timing chain and rocker arms, and spin the crank exactly one time over and bolt the chain back up correctly it doesn't matter - its still TDC relative to the crankshaft.
<strong>Was #1 at TDC. Now #1 has 2 different TDCs. It has to be TDC on the compression stroke, not the exhaust stroke! Thats the ONLY way to have your problem! Piston hit valves... PERIOD. Valves dont hit themselves.
I bet $$$ that you didnt have TDC on the right stroke.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">That wouldn't have an impact on valve clearance if it was set dot-to-dot. The Camshaft is what decides what stroke you are on. If you unbolt the timing chain and rocker arms, and spin the crank exactly one time over and bolt the chain back up correctly it doesn't matter - its still TDC relative to the crankshaft.
10-20-2002, 03:08 PM
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Re: Tore the motor back down......H-o-l-y **** </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Country Boy:
<strong>Was #1 at TDC. Now #1 has 2 different TDCs. It has to be TDC on the compression stroke, not the exhaust stroke! Thats the ONLY way to have your problem! Piston hit valves... PERIOD. Valves dont hit themselves.
I bet $$$ that you didnt have TDC on the right stroke.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Incorrect. He said it was dot-to-dot. It would have to be correct.. I do agree on P-V contact. Either the milling or wrong cam bufu.
<strong>Was #1 at TDC. Now #1 has 2 different TDCs. It has to be TDC on the compression stroke, not the exhaust stroke! Thats the ONLY way to have your problem! Piston hit valves... PERIOD. Valves dont hit themselves.
I bet $$$ that you didnt have TDC on the right stroke.</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Incorrect. He said it was dot-to-dot. It would have to be correct.. I do agree on P-V contact. Either the milling or wrong cam bufu.
10-21-2002, 12:11 AM
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Re: Tore the motor back down......H-o-l-y **** Was #1 at TDC. Now #1 has 2 different TDCs. It has to be TDC on the compression stroke, not the exhaust stroke! Thats the ONLY way to have your problem! Piston hit valves... PERIOD. Valves dont hit themselves.
I bet $$$ that you didnt have TDC on the right stroke.
I bet $$$ that you didnt have TDC on the right stroke.
10-21-2002, 12:58 AM
#14
Re: Tore the motor back down......H-o-l-y **** </font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Was #1 at TDC. Now #1 has 2 different TDCs. It has to be TDC on the compression stroke, not the exhaust stroke! Thats the ONLY way to have your problem! Piston hit valves... PERIOD. Valves dont hit themselves.
I bet $$$ that you didnt have TDC on the right stroke. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Country Boy, the motor was on the correct TDC. I checked before buttoning everything up.
Mike, I am going to measure the CC's tomorrow(don't have my micrometer). I think p/v is the culprit. Pushrods were 7.350, so I should have been good there......
Can somebody host a few pics for me to post on here? TIA
Josh
<small>[ October 20, 2002, 07:02 PM: Message edited by: Damian ]</small>
I bet $$$ that you didnt have TDC on the right stroke. </font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Country Boy, the motor was on the correct TDC. I checked before buttoning everything up.
Mike, I am going to measure the CC's tomorrow(don't have my micrometer). I think p/v is the culprit. Pushrods were 7.350, so I should have been good there......
Can somebody host a few pics for me to post on here? TIA
Josh
<small>[ October 20, 2002, 07:02 PM: Message edited by: Damian ]</small>
10-21-2002, 03:01 PM
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Re: Tore the motor back down......H-o-l-y **** damn josh, sucks to hear that, i can put some pics on my geocities page and put them on here if ya want me to. im me ssrudolph1
