Fresh Engine. Low Compression

a91what

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Apr 21, 2014

#81

• Apr 21, 2014

• #81

i assembled the block they did the heads. when i ringed the pistons the rings were alittle tight but they spun and moved i didnt think anything of it..... i fubared this one. but the rings and pistons came together so i just assumed they were right. i need 1.5mm rings not 1.9...... oh well live and learn. ill check next time.

 

a91what

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Apr 21, 2014

#82

• Apr 21, 2014

• #82

ok so i typed to soon. the piston specs a 5/64 ring and thats what i used. checked with mic. so now what? why are they binding up. any takers?

 

mikestang63

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Apr 21, 2014

#83

• Apr 21, 2014

• #83

a91what said:

ok so i typed to soon. the piston specs a 5/64 ring and thats what i used. checked with mic. so now what? why are they binding up. any takers?

Click to expand...

what was your end gap. Did you install the rings in the correct lands and right side up.

 

a91what

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Apr 21, 2014

#84

• Apr 21, 2014

• #84

miced ring and land on piston.... only .003 difference. ring .078 / landing .081

 

a91what

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Apr 21, 2014

#85

• Apr 21, 2014

• #85

i got standard gap rings. not file to fit. but ill get that tomorrow its all locked away now. yes dots are up shinny ring is top ring. cleaned them after getting them off and theywent back on just fine.

 

a91what

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Apr 25, 2014

#86

• Apr 25, 2014

• #86

ok so i think i figured it out. all the pistons had the same in the lands. a mix of what looks like teflon off the side of the pistons, and very fine metal shavings from the cylider walls. i do not think i cleaned the block well enough before assembly. all the bearings look great, lucky me. so as to not make the same mistake again i will scrub and wipe the walls down better this time. idk what to do about the teflon coating however. hopefully it wont spur any more issues. ill post pics later today.

 

elarm1

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Apr 25, 2014

#87

• Apr 25, 2014

• #87

And you are sure this^ prevented the engine from running??? I've seen motors with far more shiet in them run like champs. I think your chasing the wrong problem imo

 

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DesertDawg

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Apr 25, 2014

#88

• Apr 25, 2014

• #88

quite correct, I have rebuilt engines but I'm no engine builder

 

a91what

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Apr 25, 2014

#89

• Apr 25, 2014

• #89

mikestang63 said:

what was your end gap. Did you install the rings in the correct lands and right side up.

Click to expand...

ring end gap .016 top, .018 second ring

 

a91what

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Apr 25, 2014

#90

• Apr 25, 2014

• #90

ok you can see the rings are stuck. i have to pry them out of the piston. they did come loose after 24hrs soaking in a tub of carb cleaner.

 

elarm1

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Apr 25, 2014

#91

• Apr 25, 2014

• #91

woah thats not right. looks like the wrong sized rings

 

a91what

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Apr 25, 2014

#92

• Apr 25, 2014

• #92

the top ring is now thinner as well.

 

a91what

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Apr 25, 2014

#93

• Apr 25, 2014

• #93

 

a91what

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Apr 25, 2014

#94

• Apr 25, 2014

• #94

elarm1 said:

And you are sure this^ prevented the engine from running??? I've seen motors with far more shiet in them run like champs. I think your chasing the wrong problem imo

Click to expand...

the car ran after the wet compression test for about 30mins. so yes it ran, but had terrible dry compression. =bad rings. so it came apart.

 

a91what

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Jun 3, 2014

#95

• Jun 3, 2014

• #95

ok so the car gods smited the shiz out of me. Took all the stuff down to my local go fast shop and they said "well you **** up" exact words. they cleaned up the block for me and i assembled her again. this time i used the cast rings nothing fancy, there was minimal damage to the cyliders but they said it was nothing to be concerened over. so just waiting for decent weather to drop it back in.

 

FoxMustangLvr

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Jun 3, 2014

#96

• Jun 3, 2014

• #96

@a91what

So to get this straight, all of this is caused by some debris left in the block prior to assembly?

 

DesertDawg

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#97

• Jun 3, 2014

• #97

DesertDawg said:

quite correct, I have rebuilt engines but I'm no engine builder

Click to expand...

 

a91what

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Jun 7, 2014

#98

• Jun 7, 2014

• #98

yes, to put it simply. the debris got lodged in the ring lands and the rings were frozen in place.

 

a91what

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Jul 4, 2014

#99

• Jul 4, 2014

• #99

took it for the maiden voyage today. plenty of power but a tick started to develop so off came the valve covers...... damn 1.72rr lost a roller tip. put the stockers back on problem solved (for 20mins). took it back out for another spin and the clutch felt spongey, bought the swap parts off cl and used em all so this one was not surprising. after a spirited drive, pulled back in the yard and behold the tick is back. much less noticable but i could here it with the hood up. now the question is am i hearing a slight header leak or is a lifter not pumping up.

 

a91what

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Jul 11, 2014

#100

• Jul 11, 2014

• #100

collapsed the lifters. new comp cams lifters going in.