2 end pistons/rods installed but crankshaft aint turning

[jyoungblood87]

I'd mic those measurements.

Measure each and every bearing, measure each journal and do the math to find out which colors you need for YOUR desired oil clearance.

yea i was doing the mearsurements on paper but it didnt come out right... like negative numbers....

i used: BT= (BH - JD - BC)/2

based off the equation:
BC = BH - JD -(2xBT)

BC = bearing clearance
BH = Bore housing diameter
JD = journal diameter
BT = Bearing thickness

i used a digital dial caliper that can only go one-thousands (0.001) of an inch on all measurements...but do i need to soley need to use a micrometer...

[jyoungblood87]

its actually reffered to as undersized bearing not oversized.

i thought the less oil clearance u have the bigger the bearing....and vice versa...

[d112crzy]

i thought the less oil clearance u have the bigger the bearing....and vice versa...

That is correct.

Less oil clearance will leave a thicker plastigage.

[jyoungblood87]

That is correct.

Less oil clearance will leave a thicker plastigage.

yea thats wat i thought....so should i soley use a micrometer for measurements???

[d112crzy]

Well, you won't know your exact bearings sizes that you need for a certain oil clearance if you don't measure.

Plastigage is only used to know that you're in the ballpark.

[jyoungblood87]

Well, you won't know your exact bearings sizes that you need for a certain oil clearance if you don't measure.

Plastigage is only used to know that you're in the ballpark.

yeah i understand that...im wondering which is perferred for measuring...a micrometer or a dial caliper???? if both...then for which part... ie. bearing, journal, connecting rod boar....

[jyoungblood87]

yeah i understand that...im wondering which is perferred for measuring...a micrometer or a dial caliper???? if both...then for which part... ie. bearing, journal, connecting rod boar....

BUMP

[bruno8747]

The micrometer tends to be more accurate than the dial caliper.

[Old School]

A dial caliper is not accurate enough for this type of measurement.
A micrometer is capable of .00005 (50 millionths of a inch) accuracy, but this depends on the calabration of the micrometer and the skill of the user.

[jyoungblood87]

so just bringing some light back to this thread....

i had ordered a 2 sets of pink bearing for shits and jiggles...i installed them and...







they still arent getting any oil clearance...

[jyoungblood87]

the measurements of the bore of the connecting rods arent within specs (getting around 1.9865")...i thought i was measuring wrong...

so i got pissed off...then thought to measure the bore of my original stock connecting rods...and BAM........

2.008" on the nose...

i couldn't believe it...i measured my forged connecting and my stock connecting rods like five timesback and forth...

so i concluded that the rods where the wrong size...but thats what i get for cheaping out on some no name bullshit ass ebay coughforgedough connecting rods...

[jyoungblood87]

this is a harsh lesson learned...


1. Dont Buy Noname Bullsht on Ebay...Especially when it comes to engine internals

2. Always Measure before installing internals

3. Never Assume

4. Be informative when asking for help

5. Mistakes are expensive

[d112crzy]

well..you're not completely at a loss yet. You can get your rods bored out to whatever you need.

Who was the seller of the rods and do you have pics/links of them? Would be nice to know what to watch out for.

[jyoungblood87]

but anyways i just wanted to share with anybody has any interest with this thread about my connecting rod problems...i gained a lot from this experience...

this is just a minor set back... i have new set of Crower Connecting Rods being made now as i type...an order of 4 set of new wrist pins and wire locks that should be delivered today....

its going to take 6 to 8 weeks for the connecting rods to come since Crower is out of stock of them and have to be made...the salesman gave me fifty dollars off, so its only $687... i ordered the I-Beam Forged Connecting rods instead of going with another set of H-Beam Rods...if imma do it imma do it right...plus i found out on the Crower site that H-Beam Rods can only hold up around 15psi of boost, kinda ***...

but in the meantime imma be buying and building up the other parts of the engine... ie, custom: head gasket, oil line, timing kit, water pump...and so-so

A wise man sees failure as progress...

[jyoungblood87]

well..you're not completely at a loss yet. You can get your rods bored out to whatever you need.

Who was the seller of the rods and do you have pics/links of them? Would be nice to know what to watch out for.

oh yes i do...i put all to ppl i buy from in my favorite sellers folder on ebay so i remember what i bought from whom....


BEWARE OF...............

the seller: perfectcrank
the store: Crankshaft Depot
the link: http://stores.ebay.com/CRANKSHAFT-DE...Q3amesstQQtZkm