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Old 10-22-2010, 06:09 PM   #1
crazyoctopus
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Default YoshiFab Valve Relief Tool How to

Start with the block, all dirty and grimy.



then clean the pistons off to insure a great seat of the drill and why not?





Then make sure that you have everything needed




After setting the pistons at their highest and lowest points tape off the top of the block with your favorite tape; this eases cleanup and protects the oil and coolant holes from collecting unwanted metal shavings







Cut some slits so that you can bolt in the tool and tighten down the bolts



Check to make sure that the proper depth is met



Tighten your favorite drill to the valve relief drill



The key to drilling the reliefs is that you go slowly (low rpm) and let the drill do all the work; i.e. do not put much, or any, downward force on the drill.

http://www.youtube.com/watch?v=dp9Lxrd7dtg&hd=1

Rinse and repeat that on all of the bits. After completion remove the tool and look at the damage you have done



Put just the bolts back in to make sure that none of the shavings get into them, and brush them off




Remove the tape to reveal your relived piston (eh eh; get it, get it? it is relieved because it wont get slapped by a valve! bah!)



Now re-tape the now exposed cylinder to protect it from the subsequent drilling. After that has been completed do the exact same process, minus the depth check, on all of the cylinders. Once completed it should look just like this.






Now pour your self a stiff cocktail, beer, or non-alcoholic beverage and move onto something else.
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Old 10-22-2010, 06:39 PM   #2
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looks oem that .

do they sell this kit or what ?
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Old 10-22-2010, 07:06 PM   #3
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That's a really ingenious kit, of which I shall want to rent.

Question tho... shouldn't you really use a hg underneath the partial head? Even tho the hg is only 1mm, it will change the angle of "impact" slightly with the piston, won't it?

Great job and great idea guys!
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Old 10-22-2010, 07:35 PM   #4
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The cutters are larger than the valves themselves. Shouldn't be a problem.
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Old 10-22-2010, 07:49 PM   #5
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I like this.....
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Old 10-24-2010, 08:15 PM   #6
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This will be used for my build in the near future.
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Old 10-24-2010, 10:20 PM   #7
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How much does the "system" rent for and how long is the list waiting for it?
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Old 10-24-2010, 11:57 PM   #8
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Rent it HERE
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Old 10-25-2010, 09:46 AM   #9
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that's fantastic.
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Old 10-25-2010, 06:48 PM   #10
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Thanks Josh, Dave Barton and the rest of the people who helped make this happen. The tool is a heavily cut up 16v head and the cutters are the custom part and the real expense in making this tool. One part that seems missing is the information of the crank locking tool. You can see it in a few pictures. It is the two bolts with a square bar over the fully recessed piston next to the cutter tool. Thanks for the writeup on it.

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Old 10-25-2010, 06:56 PM   #11
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Freaking sweet.

Ya'll are pimps!
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Old 10-25-2010, 10:07 PM   #12
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Freaking sweet.

Ya'll are pimps!
Beats killing people by only a little.

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Old 10-25-2010, 10:57 PM   #13
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just barely.
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Old 10-26-2010, 11:38 AM   #14
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Noice, may do this since I have the prerequisite 16 thumbtacks head.
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Old 10-26-2010, 12:27 PM   #15
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the edge's look real sharp, don't you get pre ignition by that?
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Old 10-26-2010, 01:44 PM   #16
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don't you get pre ignition by that?
Nope. You could always ease the egde with some sand paper if you are worried about it.
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Old 10-26-2010, 01:55 PM   #17
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dude....thats bad ass!
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Old 10-26-2010, 02:52 PM   #18
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Excellent.
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Old 05-27-2011, 02:57 AM   #19
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Excellent.
We aim to please.

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Old 05-27-2011, 10:01 AM   #20
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I just used it.... worked great. total job took about an hour. awesome tool
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Old 06-01-2011, 03:29 PM   #21
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Can someone please share the clearance depth you're using for stock cams. It's not mentioned in this thread.
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Old 06-01-2011, 03:37 PM   #22
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Don't think it matters, as far as I know all this does is make reliefs so that when the piston is at TDC it doesn't hit the valves, nothing more.
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Old 06-01-2011, 03:41 PM   #23
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Quote:
Originally Posted by dbarton View Post
Can someone please share the clearance depth you're using for stock cams. It's not mentioned in this thread.
Dave B
It's stamped on the tool. .160" for the intake and .135" for the exhaust.
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Old 06-01-2011, 04:47 PM   #24
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Excellent tool, great job to everyone involved!
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Old 06-01-2011, 07:02 PM   #25
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It's stamped on the tool. .160" for the intake and .135" for the exhaust.
Awesome, thanks. My B230 motor now has valve reliefs.
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