New rebuild ,barely turns ?? - Team Camaro Tech
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post #1 of 31 (permalink) Old Oct 14th, 09, 06:39 PM Thread Starter
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Bubba
 
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New rebuild ,barely turns ??

I thought it would be fun to build a new engine for my project car .i never built one from the ground up but i give it a whirl and now it's giving me, a headache. Here's what I got.

i put an eagle 383 stroker kit in and used plastigauge to check clearances and tolerances ....checked out fine

just crankshaft in ...it turned easy

when i put the connecting rods and pistons on....kinda had to bow up....but would turn

but now with engine in car and all accessories on ...when i try to turn it over it jus barely turns???? to give you an idea the alternater pulley may make an 1/8 of a turn..(maybe try to post a short vid). i have bumped it enough to make 3 revolutions with the crank but kind of wondering if i need to keep going ..

things i've done to help lower compression/friction ,by the way compression is 10.7:1 ......
removed plugs ..
backed off rocker arms...
put a dab of oil down sparkplug holes

also put a new starter on today...no help
i kicked the tires a couple of times and cussed it ...didn 't help either

i'm lost please help
no more ideas
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post #2 of 31 (permalink) Old Oct 14th, 09, 06:45 PM
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Todd
 
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Re: New rebuild ,barely turns ??

Time to tear it back down and see what's going on. A short block should turn with less than 50 ftlbs of torque. You may have a rod in backwards or multiples.....
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post #3 of 31 (permalink) Old Oct 14th, 09, 06:46 PM
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Re: New rebuild ,barely turns ??

Are you sure you have the right bore size vs piston?
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post #4 of 31 (permalink) Old Oct 14th, 09, 06:48 PM
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Bill
 
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Re: New rebuild ,barely turns ??

Bubba,

With the spark plugs out, you should be able to turn the engine over with a long 3/8 drive rachet on the damper bolt. If you cant, you need to take it out and apart and find out why.

The longer you keep messing with it, the more damage you are doing

Bill Koustenis
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Waldorf Md
1971 Chevelle "Heavy Chevy" original owner


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post #5 of 31 (permalink) Old Oct 14th, 09, 07:29 PM
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Re: New rebuild ,barely turns ??

I agree with Bill.

Altho, Ones version of 'hard to turn over' might be "turns to easy' for the next guy.

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Thanks Chief.
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post #6 of 31 (permalink) Old Oct 14th, 09, 07:43 PM
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Re: New rebuild ,barely turns ??

On reassembly, check the rotation after every part you add.

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post #7 of 31 (permalink) Old Oct 14th, 09, 09:45 PM Thread Starter
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Bubba
 
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Re: New rebuild ,barely turns ??

thanks for the input guys that's what i was thinking the best bet would be is to just reassemble, i did turn it with a torque wrench with just crank and rods,before i dropped it in , it was about 85 lbs of torque to turn it, i was semi-concerned then but,i had asked a couple of ol dirt trackers i work with about that and the answers were split between 50 lbs and 80 lbs ..oh well better luck next time
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post #8 of 31 (permalink) Old Oct 14th, 09, 10:53 PM
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Steps
 
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Re: New rebuild ,barely turns ??

Quote:
oh well better luck next time
"Luck is directly proportional to the effort put in"
Mark Twain

Hey its your 1st build...you are better off having tight and have to strip down, than to fire up and do damage like collaspe a piston

In my books you should be a happy chappy

My Spelling is not incorrect...it is creative

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post #9 of 31 (permalink) Old Oct 14th, 09, 11:24 PM
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Re: New rebuild ,barely turns ??

If it makes a difference, my newly rebuilt motor (never ran, new everything, bottom end, crank turned, bearings...) was very difficult to turn over, especially after setting the valves. Even with the rockers loose, it was still difficult, I'm not saying there isn't a problem, but it's probably nothing to worry about.

After turning it over after 6,000mi by hand, it seemed way easier.

good luck!

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post #10 of 31 (permalink) Old Oct 15th, 09, 12:30 AM
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Todd
 
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Re: New rebuild ,barely turns ??

Pretty sure it's not turning over with a starter......
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post #11 of 31 (permalink) Old Oct 15th, 09, 06:32 AM
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Re: New rebuild ,barely turns ??

have you checked rod side clearance ? they should be able to move side to side very slightly. Also crankshaft endplay.
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post #12 of 31 (permalink) Old Oct 15th, 09, 06:40 AM
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Re: New rebuild ,barely turns ??

Insufficient piston to wall clearance could add a fair amount to the torque required to turn it over,but you would feel that when installing the pistons.My bet is ring end gap,or the oil ring expanders popped out when you were putting the pistons in and now you have a mess in the oil ring groove consisting of an expander rail turned on it's side with the rails wrapped around it.Another thing could be an excessivly rough bore finish.Rods in backwards like another post said is also a possibilty.These are the places I would checkThats a huge amount of torque to turn over a short block as far as I am concerned.
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post #13 of 31 (permalink) Old Oct 15th, 09, 07:05 AM
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Re: New rebuild ,barely turns ??

Could there be any problem with the transmission binding or restrictions? Don't know what you have attached in your car. My newly built BBC could not be turned over by a 3/8 racket and starts fine with starter. Did you put a ring in the bores and measure ring end gap @ top and bottom of cylinder
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post #14 of 31 (permalink) Old Oct 15th, 09, 07:50 AM
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Re: New rebuild ,barely turns ??

I believe the turning torque should be about 35-40 ft-lbs for the crank, rods, and pistons in the block or about 5 ft-lbs per piston/rod installed. You had double that at 85 ft-lbs.

Quote:
Originally Posted by BiGBuBBa
i did turn it with a torque wrench with just crank and rods,before i dropped it in , it was about 85 lbs of torque to turn it
Take the advice form the guys and pull the engine and find out what the problem with the short block.
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post #15 of 31 (permalink) Old Oct 15th, 09, 08:56 AM
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Re: New rebuild ,barely turns ??

If you look at the first post, Bubba put in a 383 stroker crank. The first thing I'd look at is was the block clearanced for the longer throw of the crank or not. I'll bet a cold one he has a rod rubbing the block.

Russ (RJ)
The Garlic Capital, Gilroy,CA

(sold June 15,2014) 1968 RS convertible that is not quite stock

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