an easier way to measure deck height? |
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an easier way to measure deck height? |
Jakeodoule |
Sep 18 2009, 11:06 PM
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#1
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Member Group: Members Posts: 353 Joined: 10-October 08 From: Des Moines Iowa Member No.: 9,630 Region Association: Pacific Northwest |
After reading lots of post on measuring deck height, as well as searching the internet on ways to measure it. I thought there has to be an easier way…
I made a plate that fits on the cylinder. Make sure it’s a good thick plate. I then drilled holes right above the outer part of the bore on both sides. Bolt it down tight. Then I just zeroed out the digital caliper on the upper ring of the cylinder. I checked zero on each side of the plate to make sure its flat. Moved it to one of the piston holes that I drilled. Pushed the caliper end into the bore and turned the cylinder through…. Then I took a reading off the caliper. It only pushes the caliper in to the point of your deck height. You have to keep the caliper straight! But I took 4 or 5 readings on each side of the piston and each time I came within .0005 of the last reading. This seems rather simple to me as you do not need to find TDC. Just turn the crank till the piston rises and falls a little bit. In between you just shove the end of the caliper in and let the piston push the caliper shaft up till the piston drops back down and that’s your deck height… I also saw many posts that said you only had to measure 1 cylinder. Thats bogus because 1 one my cylinders was .009 thou off from the others. I would measure each one if I were you. Also if you don't have any rings in you need to be careful about the piston being tilted a bit. So I just averaged the readings from side to side. I’m sure I’ve done something that I will be flamed about by all the professional motor builders, but it seems to work for me. I have thick skin so tell me what I did wrong…. |
ME733 |
Sep 19 2009, 05:31 PM
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#2
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Senior Member Group: Members Posts: 842 Joined: 25-June 08 From: Atlanta Ga. Member No.: 9,209 Region Association: South East States |
(IMG:style_emoticons/default/popcorn[1].gif) Well capt. crusty I have noted on several occasions now that YOU have made comments reguarding ...LAPPING...of . various parts. Specifically ..HEAD sealing surfaces and The tops of CYLINDERS. you have stated Previously you have 36 years of engine building experience. I would suggest that you have only assembly experience. IT is IMPOSSABLE to blueprint, build an engine to the closest tollarences of accuracy without using LAPPING (of various parts) as a TECHNIQUE to get to that point.....I suppose you never have LAPPED valves into their seats ...while in the process of doing a valve job. I guess you just bolt up whatever the machine shop gives you to assemble. The technique for getting the cylinder barrell heights perfectly level was explained. maybe it does take a certain level of mechanical appitude to LAP components but it is necessary, required, to get it perfect. try cutting off just .0005ths ..1/2 ths..or .001ths from the top of a cylinder barrell. IT takes a TOOL ROOM lathe for that level of accuracy.(I could have said .002 or.005ths ) which would be difficult ( impossable?) even for the best machinists. ..so how about S.ing T. F.up about this technique, and method which you apparently know nothing about, have never used, and apparently will not accept as a, technique, method , of engine BUILDING. Capt. Crusty I appreciate all that you do on this site. and your knowledge of 914 stuff is incredable. thanks. Murray Mcafee ..Black Forest Engineering. (retired) (IMG:style_emoticons/default/popcorn[1].gif)
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