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Tractor Pulling Discussion Forum

stroke / clearancing tool

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wi50

03-09-2014 09:08:41
70.194.74.169



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Here's a simple tool I made up for clearancing blocks, or
checking to see what fits when useing different rod or stroke
combinations or different blocks. I just made arms with hole
centers for 1/2 stroke foe example a 6" stroke is a 3" offset, or
3" center to center on the holes. I made different slugs to fit
different main bearing bores and rod end bores of different
rods.

I don't know if it's NATPA legal to use when building a motor or
not, but it sure is handy. Maybe a few of you will make
something similar or have made something to make the job
easier. I just hate mock up, grinding, clean up, over and over. And I get way to many questions of what stroke fits with what rod in this block or that block. I can check things out ahead of time and I like to keep a greater cap angle on the rods when possiable, it makes for a bit stronger rod.

I made this tool up and send it out to people I'm working with so they can check and do a little planning for those who are building their own engines or I'm helping them with the planning, selling them parts, rotating assemblies etc.


This post was edited by wi50 at 09:15:44 03/09/14 2 times.

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algar7

03-09-2014 19:39:09
24.239.104.17



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 Re: stroke / clearancing tool in reply to wi50, 03-09-2014 09:08:41  
Very nice,I made a nylon bushing for the cam on JD's to slip over the left side when clearancing the cam



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VicS

03-09-2014 16:48:25
70.195.65.193



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 Re: stroke / clearancing tool in reply to wi50, 03-09-2014 09:08:41  
The simple ideas are always the best. Thanks for sharing. I have took the crank out at least 20 times. Vic



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Flyin Farmall

03-09-2014 16:43:58
66.191.105.134



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 Re: stroke / clearancing tool in reply to wi50, 03-09-2014 09:08:41  
thats a great idea!! i'll be building myself one



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Jasonillinois

03-09-2014 11:18:03
107.152.11.3



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 Re: stroke / clearancing tool in reply to wi50, 03-09-2014 09:08:41  
The tool worked great and was extremely easy to use. Let alone figure out clearances without having a crank there.

I greatly appreciate Marty's work and craftsmanship.

Jason



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wi50

03-09-2014 11:41:03
70.194.74.169



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 Re: stroke / clearancing tool in reply to Jasonillinois, 03-09-2014 11:18:03  
Without the crank in the engine, you can watch how the rod swings past the cam, the sleeve, etc. You can set an oil pan on and spin the shaft, or watch in the other end of the engine to see if you're dealing with an engine where it may be an issue. Get a visual on things and see if a different cap angle would work better or if there's enough room to run a different rod.

I just made it in an hour or less from a few bucks of left over materials and otherwise scrap and it's saved me many hours. I can set a crank in and mark the fore-aft position of where the rods are going to swing and then set my good parts aside, use this and not have to guess.

For example I'm working with someone hundreds of miles away and they wanted to run a longer stroke in a narrower block.....will it fit? What does a guy do when it doesn't?....or should we use a different combination. For a few bucks postage things get figured out up front and I don't need the block or core parts to get most of the job done.

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LW

03-09-2014 12:56:20
76.6.141.186



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 Re: stroke / clearancing tool in reply to wi50, 03-09-2014 11:41:03  
Made one of those myself years ago I make the journals out of nylon so they absorb any foreign matter.



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H-66

03-09-2014 11:02:23
96.41.225.169



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 Re: stroke / clearancing tool in reply to wi50, 03-09-2014 09:08:41  
That is a great idea Marty. Thanks for the tip!
Jim Henke



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ep

03-09-2014 16:35:39
70.215.4.137



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 Re: stroke / clearancing tool in reply to H-66, 03-09-2014 11:02:23  
Great idea,that will save lots of time and simple to make thanks for the pics!



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