engine builders needed
Thread Starter
Launching!
Joined: Jun 2002
Posts: 212
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From: TX
engine builders needed i have a slightly used ls1 crank going in a block i have here. i bought standard main bearings from thunder racing (part # 152m). the main bearing journals measure
1st = 2.558
2nd = 2.559
3rd = 2.559
4th = 2.559
5th = 2.558
when i install the bearings i used engine assembly lube. placed the crank in the block everything was fine. when i put the 2 and 3rd main cap on the crank did not spin. if i used a pretty new crank that is still in factory specs why would the main bearings (152m) not work
1st = 2.558
2nd = 2.559
3rd = 2.559
4th = 2.559
5th = 2.558
when i install the bearings i used engine assembly lube. placed the crank in the block everything was fine. when i put the 2 and 3rd main cap on the crank did not spin. if i used a pretty new crank that is still in factory specs why would the main bearings (152m) not work
Adkoonerstrator
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From: Deep in the seedy underworld of Koonerville
Re: engine builders needed Did you check to see if the crank was bent? That could cause it to stick even if the journals all measured within spec.
John
John
I can shift faster than you.
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From: Baton Rouge, LA
Re: engine builders needed The suggestion about the crank being bent is a good one. Take it to a local machine shop they will be able to tell very quickly.
Do you have the main caps installed in the correct direction? This would definitely cause the crank to "bind" up.
And yes, you should be able to turn the crank over by hand and it should not get tight in any spot during its rotation. If it does, pull it back apart and check. Take one cap off at a time and rotate the crank. If it starts to rotate freely after removing a specific cap, then you need to look at that cap, journal, bearing, etc. closely.
Do you have the main caps installed in the correct direction? This would definitely cause the crank to "bind" up.
And yes, you should be able to turn the crank over by hand and it should not get tight in any spot during its rotation. If it does, pull it back apart and check. Take one cap off at a time and rotate the crank. If it starts to rotate freely after removing a specific cap, then you need to look at that cap, journal, bearing, etc. closely.
I can shift faster than you.
iTrader: (21)
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From: Baton Rouge, LA
Re: engine builders needed Also, look on your bearings to be sure that they were not mispacked from Federal Mogul. On the back side of the bearing shell, you should see "STD".
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Thread Starter
Launching!
Joined: Jun 2002
Posts: 212
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From: TX
Re: engine builders needed i have installed two cranks already. both did the same thing. does anyone have a pic of the bottem end. i know i have the mains in correct order but better safe than sorry right. standard bearings should not make the crank bind up right.
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Verdad Gallardo I can shift faster than you.
iTrader: (21)
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From: Baton Rouge, LA
Re: engine builders needed Yes, they are numbered, so it's hard to get them out of order. However, you must have the caps oriented correctly. The caps have little "ears" on them. On caps 1-4, they should face the rear of the motor. Cap 5 is the only one whose "ears" face forward. I'll see if I can find some pics of the motors I have built.
Jason
Jason
Thread Starter
Launching!
Joined: Jun 2002
Posts: 212
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From: TX
Re: engine builders needed i had the "ears" facing the front of the engine. damn i feel dumb. i guess when i washed them i kept them in order but switched them around. spins like a beauty. P.S. if anyone has not biult an engine in there room at 12 midnight. DO IT!!!! its fun.
I can shift faster than you.
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From: Baton Rouge, LA
Re: engine builders needed Glad it was something simple. 
That's why I always put an arrow on the main caps pointing the front before tearing down just for this reason. Here is a pic: (you can see the arrow on the center of the cap).
http://members.***.net/kcr19/maincaps.jpg
That's why I always put an arrow on the main caps pointing the front before tearing down just for this reason. Here is a pic: (you can see the arrow on the center of the cap).http://members.***.net/kcr19/maincaps.jpg
I can shift faster than you.
iTrader: (21)
Joined: Nov 2001
Posts: 5,133
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From: Baton Rouge, LA
Re: engine builders needed If the car is strictly n/a, anywhere from .016-.018 top ring; .020-.022 second. I ran my last 346ci solid roller motor at .016/.020. The motor in my car now (stock pistons/rods; plan on 150-200 nitrous jets) is at .022/.026.
Jason
Jason
