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Auto engine bolt patterns
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. |
#2
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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 |
#3
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"Ron Webb" wrote in message ...
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. Just a thought but how about getting a new gasket that fits and using it to transfer the holes?? Harry K |
#4
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"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. |
#5
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Just a thought,
Can you use a compass to first get the proper radius of the bolt pattern from the centerline of the block (Yeah a pretty big compass) , then use a smaller compass to measure centerline of bolt to bolt? If you get the radius layout right the pattern should be perfect...or as close to it as mere mortal man can be! hee hee Patrick "Ron Webb" wrote in message ... "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. |
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#7
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"Ron Webb" wrote in message
... 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. I'm thinking of a jig for this. Insert something in the back of the crank which will extend the centerline of the shaft past the plane of the dowel pins. Something like the alignment spuds used to center a clutch plate. Make a block with a hole in it to slip over the crank extension. This block should have adjustable arms on it (equal to the number of dowels in the bell housing. Those arms could be slotted like the arms on an engine stand. Assemble the whole mess so that the ends of the arms are located on the dowels and tighten it down. Slip it back off the crank extension and you have a pattern. For one-time use, you could just weld it together from scrap. Wish I could draw it with a pencil. Rich S. |
#8
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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 |
#9
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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. It is called Technology Transfer or Tek-Connect or some such depending on manufacturer. If you or someone you know belongs to the Specialty Equipment Market Association www.sema.org , the manufacturing specs are available. That is how you are able to pick up a brake rotor at your local auto parts and it will fit. |
#10
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Thanks Andy.
That's the information I was looking for. Course, not being a member kinda puts a damper on things. Membership looks to cost about $350/yr, so I guess I'll just measure things as best I can. I knew the info was out there - I suppose I shoulda guessed it wasn't free! ;^} "Andy Asberry" wrote in message ... It is called Technology Transfer or Tek-Connect or some such depending on manufacturer. If you or someone you know belongs to the Specialty Equipment Market Association www.sema.org , the manufacturing specs are available. That is how you are able to pick up a brake rotor at your local auto parts and it will fit. |
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