Project C - Also not 56k friendly!

Gary57 · Post by **Gary57** » Thu Jun 14, 2007 9:48 am

That looks like the crank is too small for the bearings. Did all of them look like that??

PS: a cheap and easy way of checking crank size to bearing size is to use those wax strips and then measure the width it flattens to.

Vlade · Post by **Vlade** » Thu Jun 14, 2007 10:35 am

well we took off two from the conrods they both were the same...

those Wax strips, where do you get them?

Gary57 · Post by **Gary57** » Thu Jun 14, 2007 10:36 am

Spares shop should have them.

veecee · Post by **veecee** » Thu Jun 14, 2007 10:42 am

i thought they were made of some sort of plastic, because my engineer calls them plastiguage or something like that!!!

but yeah, they put everything together with those strips in place, then disassemble it and measure the thickness of the gauge! thats what i've heard.

Vlade · Post by **Vlade** » Thu Jun 14, 2007 10:45 am

thats the stuff... can't find it... spares shops didn't have, they never heard of it

veecee · Post by **veecee** » Thu Jun 14, 2007 11:02 am

ask your engineer for his suppliers number!

Draco · Post by **Draco** » Thu Jun 14, 2007 11:11 am

Just a shot in the dark.....if your prassure plate and clutch and stuff aren't well balanced on the fly wheel won't that cause a vibration that will make you crank do this to the bearings.....?

Vlade · Post by **Vlade** » Thu Jun 14, 2007 11:20 am

Yip it can

but not sure its the case here, we havn't touched the flywheel/clutch stuff.
Also one can normally feel it when its unbalanced, there is a vibration right through the RPM range, I didn't align my flywheel with the alignment pin on my first engine, took it to a clutch place so they can sort the vibration and replace the worn clutch...
I asked the dude what caused the vibration he told me some idiot didn't align the flywheel to the alignment pin...

School Fees

veecee · Post by **veecee** » Thu Jun 14, 2007 11:37 am

Vlade wrote:Yip it can but not sure its the case here, we havn't touched the flywheel/clutch stuff.
Also one can normally feel it when its unbalanced, there is a vibration right through the RPM range, I didn't align my flywheel with the alignment pin on my first engine, took it to a clutch place so they can sort the vibration and replace the worn clutch...
I asked the dude what caused the vibration he told me some idiot didn't align the flywheel to the alignment pin... School Fees

so you guys didnt send the engine in for balancing then???

i spoke to toby about this, and its not expensive. maybe if you have everything out again, send it in before its reassembled!!!

i think my balancing and weight matching (blueprinting i think its called) cost in the region of 500 bucks!

they asked me for pistons, rods, crank, flywheel, clutch assembly, crank pulley, etc. and it was a day turnaround!!!

i think if its possible now, you guys should do it!

Vlade · Post by **Vlade** » Thu Jun 14, 2007 1:51 pm

I don't really think its needed only the pistons is new in the whole assembly, the pistons was balanced.

Gary57 · Post by **Gary57** » Thu Jun 14, 2007 1:52 pm

I would bet that they over machined the crank.

Vlade · Post by **Vlade** » Thu Jun 14, 2007 2:35 pm

my guess too

The Calibrator · Post by **The Calibrator** » Thu Jun 14, 2007 9:24 pm

The big end thats shiny on the one side is from the journal being taperd.
lemme guess it wasnt Allan Y Brink?

those guys mike every bearing and every journal no no platigauge or guesswork.

Plastigauge is the name of the product and its only a guide of whats happening.
I normally only use it to double check that the bearings are the right size for the journal.

Vlade · Post by **Vlade** » Fri Jun 15, 2007 7:05 am

What would you say about the rod ones, the wear pattern there looks weird to me

Gary57 · Post by **Gary57** » Fri Jun 15, 2007 8:35 am

Hows the oil pressure??