Boostfed

OK just finished a motor assembly for a friend of mine. Set up consists of Benson sleeved GSR block 84mm, CP Pistons 84mm 9:1 CR, Eagle rods. Has a ported and polished head with .5mm over intake valves and 1m over exhaust valves(seats just freshened up and redone) Crower valvesprings and retainers, JG/Edelbrock intake manifold, Ericks racing TB. ACL main and rod bearings. On assembly two of the oik rings snagged the sleeve and snapped going into the block. me. Got new rings and installed them for that one cylinder. All pistons were pulled out and checked again to make sure the rings were straight and none were broken. ALl reinstalled without any snags. What would cause 0 compression in #1, #3 and #4. Also so low in #2. If the oil control rings did snap again going in , this would cause this? Any info is appreciated. I have done 4-5 motor assemblies with no SNAGS EVER! Once broke the second ring installing onto a piston since it is so stiff. Please give experiences.

Johnyquest

That sucks man. I don't know but somthing had to go wrong. Pretty crappy ring compressor? Either that, or there is some definitive clearance issues.

...wish I could be of more help though. Good luck

Matt

tony1

I'm gonna guess the valve lash is too tight in those cylinders and the valves aren't closing...

Boostfed

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">I'm gonna guess the valve lash is too tight in those cylinders and the valves aren't closing...</TD></TR></TABLE>

Now that is something I did not do on the motor is the valve adjustment. He wanted it quickly and said he would do it. Just got off the phone with him! LOL! I told him what you posted and asked who set his valve lash for him. He sadi "Noone, didn't you?" I told him I didn't have my tool and he wanted it back right away to have it finished by the weekend. He sadi "OH man I was high when I got it, MAH BAD!" So he is going to do a valve adjustment ad get back to me. Pray to God this is it!

Boostfed

Also had him drop a capful of oil in the hole and redo it, no #s changed at all. So it's gotta be the valves, lash or valve seats BUT they were just redone. I am praying!

DaveF

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">I'm gonna guess the valve lash is too tight in those cylinders and the valves aren't closing...</TD></TR></TABLE>

ill have to say this is also the culprit..

we had an engine a few weeks back that wouldnt start because of this.

dsadas89das78934

when i changed my cam, i forgot to reset the valve lash and discovered that the car would not start ...so i just reset the lashes and she fired right up

Boostfed

IT STARTED!!!!!!!!!!!!!! He did a valve adjustment and it started. BUT he says it smokes BAD! I gotta go check it out, it should be ALL GOOD! He did however wreck it right aftre BECAUSE he stripped a balljoint and the lower control arm popped out! DOH! He said it was sputtering also. I gotta get over there and check it out. Most builds I have seen smoked a bit until driven for awhile BUT Then have seen some that have been CLEAN AS HELL! WIll keep everyone posted. Thanks for the help everyone esepcially Tony!

Tinker219

we also noticed low #s on one cylinder, and the engine did make a bit of noise. We adjusted the valves, noise went away, so did the low #s

Boostfed

Well I have more news!!!!!! He did a valve adjustment and the car started as mentioned previously. I had him get it up to operating temp and adviised him to redo a compression test, Compression #1 185, #2 200, #3 200 and #4 185psi. With more miles on it I think hisompression should even out. I learned a new lesson today, VALVE ADJUSTMENTS can cause the valves to stay open if they are too tight, which they were not adjusted yet WHNE I gave the motor back to him #2 lesson FINISH The job EVEN if the customer asks todo something ie the valve adjustment. He says it is smoking bad BUT I advised most build ups do, drive it around, worst case scenario maybe the valve seals are bad. Again will keep you posted on this build up! Great lessons learned! First build up I have done for a customer and charged for, WAYYY LOW PRICE TOO! I was confident when I relased it to him though.

Suprdave

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony1 &raquo;</TD></TR><TR><TD CLASS="quote">I'm gonna guess the valve lash is too tight in those cylinders and the valves aren't closing...</TD></TR></TABLE>

Thats the only reason youd have 0 compression...trust me. I did the same thing like a couple months ago when I reversed the rockers for intake\exhaust on accident. The compression test was like 30psi across.

HybridKOOP

Luckily it sounds like he didn't smack the pistons into the valves during this...

ladysman

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Boostfed &raquo;</TD></TR><TR><TD CLASS="quote">Well I have more news!!!!!! He did a valve adjustment and the car started as mentioned previously. I had him get it up to operating temp and adviised him to redo a compression test, Compression #1 185, #2 200, #3 200 and #4 185psi. With more miles on it I think hisompression should even out. I learned a new lesson today, VALVE ADJUSTMENTS can cause the valves to stay open if they are too tight, which they were not adjusted yet WHNE I gave the motor back to him #2 lesson FINISH The job EVEN if the customer asks todo something ie the valve adjustment. He says it is smoking bad BUT I advised most build ups do, drive it around, worst case scenario maybe the valve seals are bad. Again will keep you posted on this build up! Great lessons learned! First build up I have done for a customer and charged for, WAYYY LOW PRICE TOO! I was confident when I relased it to him though. </TD></TR></TABLE>

It's going to smoke for a few miles. Just drive it. Trust me. I freaked the first time I saw the smoke. Good luck.