 Maximum Allowable Variance in Deck Height, Stock 2.0 Liter Four |
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| yeahmag |
 Jan 22 2020, 03:33 PM
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#21
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Advanced Member  Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California 
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Yup. Exactly how it’s done. I use a depth mic, but whatever works. It also has a lip that lets you measure the height difference between the two cylinders.
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| 914werke |
Jan 22 2020, 04:43 PM
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#22
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"I got blisters on me fingers" Group: Members Posts: 10,029 Joined: 22-March 03 From: USofA Member No.: 453 Region Association: Pacific Northwest
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QUOTE(Mark Henry @ Jan 22 2020, 01:24 PM)  That's the one I have but it also has a plate that drops in between and is keyed to the half circle cut outs you see on the bars. (IMG:style_emoticons/default/smile.gif) Hmmm I didnt get that ? Mark can you post a pic I might have to make one. |
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| yeahmag |
Jan 23 2020, 08:59 PM
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#23
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Advanced Member Group: Members Posts: 2,421 Joined: 18-April 05 From: Pasadena, CA Member No.: 3,946 Region Association: Southern California
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I found the old pictures from when I was making these. This should help.
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| Mark Henry |
Jan 23 2020, 09:28 PM
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#24
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(914werke @ Jan 22 2020, 05:43 PM) QUOTE(Mark Henry @ Jan 22 2020, 01:24 PM) That's the one I have but it also has a plate that drops in between and is keyed to the half circle cut outs you see on the bars. (IMG:style_emoticons/default/smile.gif) Hmmm I didnt get that ? Mark can you post a pic I might have to make one. Yes that's what I have. I tried to post some pics last night, but win10 was getting stuck downloading from the SD card. I need to get a hardwired wifi router out in my shop. |
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| stownsen914 |
Jan 24 2020, 07:22 AM
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#25
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
Great information on this thread …
I hope I'm not highjacking to ask a related question. How high can you get the compression ratio on a type 4 with flat top pistons? I understand people cut the heads to bump it up a bit. What if you want high compression, like, say 11:1? Domed pistons I guess? Scott |
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| Mark Henry |
Jan 24 2020, 03:25 PM
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#26
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that's what I do! Group: Members Posts: 20,065 Joined: 27-December 02 From: Port Hope, Ontario Member No.: 26 Region Association: Canada |
QUOTE(stownsen914 @ Jan 24 2020, 08:22 AM) Great information on this thread … I hope I'm not highjacking to ask a related question. How high can you get the compression ratio on a type 4 with flat top pistons? I understand people cut the heads to bump it up a bit. What if you want high compression, like, say 11:1? Domed pistons I guess? Scott Why 11:1? Fly cutting is the easiest, you can surface the head fin for more clearance, some remove a fin, other builders have welded the chambers making them smaller. I don't know if domed T4 piston are available, maybe custom order from JE. You could make you own "dome" if you have the deck to play with, but I can't see getting more than .5cc doing this. |
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| jsaum |
Jan 24 2020, 06:05 PM
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#27
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Senior Member Group: Members Posts: 530 Joined: 12-June 07 From: Everett, WA Member No.: 7,809 Region Association: None |
QUOTE(914werke @ Jan 22 2020, 02:43 PM) QUOTE(Mark Henry @ Jan 22 2020, 01:24 PM) That's the one I have but it also has a plate that drops in between and is keyed to the half circle cut outs you see on the bars. (IMG:style_emoticons/default/smile.gif) Hmmm I didnt get that ? Mark can you post a pic I might have to make one. Rich, I have the plate if you want to take a look at it. James |
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| stownsen914 |
Jan 24 2020, 08:57 PM
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#28
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Senior Member Group: Members Posts: 913 Joined: 3-October 06 From: Ossining, NY Member No.: 6,985 Region Association: None |
QUOTE(Mark Henry @ Jan 24 2020, 04:25 PM) Why 11:1? Thanks for sharing your thoughts. I'm planning to put together a 1.8L race engine for an old SCCA 914 I just bought. I'm more familiar with 911 engines where 11:1 is no big deal. Is that high for a type 4? Understood that I may need to have custom pistons made. |
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