Auto engine bolt patterns

Ron Webb wrote:

"Corky Scott" wrote in message
...

On Sun, 17 Oct 2004 17:04:26 -0800, "Ron Webb"
wrote:


Hello

Does anyone have any experience getting the bolt pattern off the
transmission side of an auto engine?

I'm building a PSRU, and I need to make the plate that bolts to the

engine.

The rest of the pattern is generic, but that is engine specific.

I have tried several ways of measuring the holes in the block, but I'm

sure

I can't get accuracy better than 1/10 inch or so. Surly engineering

drawings

for these patterns are available somewhere.

Here's an idea that I've had for some time. Machine some bolts that
fit the threads of the block into points. Thread them into the block
such that the pointed end is facing out. Place an aluminum sheet (at
least 1/4 thick) over the engine and tap each bolt location with a
hammer. This center punches the bolt's location.

Take the template over to your drill press and drill out the center
punched holes. That should be very accurate.

Corky Scott


Thanks guys.

Both good suggestions.

But the one dimension that must be DEAD accurate is the position of the
center of the crank relative to the dowel pins.. Neither suggestion is going
to solve this one without taking the engine apart. I am working on a new
aluminum Ford 4.6L V8 short block, so the entire lower end is already in
place.

Take the block to a machine shop with a CMM and they'll have your
dimensions in no time.


Matt

Seriously, this is least painfull and most reliable approach.

You not only need to do the right thing, but also document what you did for
the future...

Keith
"Matt Whiting" schrieb im Newsbeitrag
...
Ron Webb wrote:


Take the block to a machine shop with a CMM and they'll have your
dimensions in no time.


Matt