Mopar Muscle Association UK

thats a bananarama pain in the bananarama!

Wow that's a long way out. My Quicktime bellhousing for the 360/TKO500 was spot on.

Yea I do seem to have got a bad one, I'd already had to rework various bit of it that didn't fit together.

I take it you checked the engine block mounting face with the dial gauge? and is the bellhousing is square to the engine block?

And i take it you’ve tried it without the adaptor ring in place?

Yes Matt I get the same readings with and without the adaptor ring. I still need to check the mounting faces are square before I commit to altering anything.

I am far from convinced you can measure that accurately by using that type of gauge in that manner. You are not at 90 degrees to the surface.

That concerned me too Dave but as it consistently returned to zero at the same spot I felt it was accurate? Getting it to sit at 90degrees to the surface was nigh on impossible given the space constraints. I did manage to have it square today to check the mounting face and that's too low at the bottom so I'll have to shim that level before I check the centre bore again.

I have a very small metric Dial Gauge if you want to borrow it...

I have never seen one that far out though...

if it was 90* it would show an even bigger runout....

so still wrong just wronger than measured

did you get it from summit?

in the past i have provided photo evidence of wrongness to them and they just sent another....

Dave

Came from Speedway about 5 years ago unfortunatly. Will try harder to get gauge set at 90 degrees next time...

There is a proper tool for checking bores. I seem to remember using one many years ago.

Dave999 wrote: Wed Nov 27, 19 9:35 am if it was 90* it would show an even bigger runout....

it works the other way around. it's known as cosine error. your measurement is bigger than actual.

so if i put my dial gauge at 45 degrees from parallel with a surface and move the surface 20 thou i will measure greater than 20 thou

but if it was 90 i'd measure 20 thou.... aaaaaah you have melted my brain
i'm off to read up....



15 minutes passes

Oh....yes my god.. yes indeed....

learn something new everyday

although the tip of the dial indicator compensates for "cosine error" up to a 20* lean from perpendicular
provided its the right shape....ahhhh never knew that either, suggest a cheap one from china probably doesn't but a decent euro or US made one probably does



right i should do some work....

Dave

Blue wrote: Tue Nov 26, 19 4:53 pm That concerned me too Dave but as it consistently returned to zero at the same spot I felt it was accurate? Getting it to sit at 90degrees to the surface was nigh on impossible given the space constraints. I did manage to have it square today to check the mounting face and that's too low at the bottom so I'll have to shim that level before I check the centre bore again.

Would a lever type gauge not be better than your plunger type for that situation? Shouldn't bankrupt you if you haven't got one as long as you don't go silly on spec.