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Thread: Looper exhaust porting
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11-27-2013, 05:31 PM #316000 RPM
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Like this...
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11-27-2013, 06:14 PM #32Screaming And Flying!
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could you do the grinding on a NC mill as in production line stuff?
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11-27-2013, 06:43 PM #33
No no fingers in a 2.7 and its very rare to find a 2.7 block that even has finger port bosses.
You cannot cut there on a 2.7. There is no boss there. 1998ish and up 3.0 and 3.3 have a boss but its still not a strait shot into the boost.
Dont dig too deep on the rod slots for a low rpm motor. You will loose primary compression and power will suffer through most of your useable RPM range.
Stuff the crank case as much as you can. Theres a ton of room (read volume) to fill in the intakes around reed blocks and you can take .090 off the front half without having to grind too much (except #1 u have to grind a bunch, you will see why).
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11-28-2013, 12:11 AM #34
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11-28-2013, 06:25 AM #35
0.039370 X 25.4 = 0.999998 inches. So your boss kicked your butt for being out 2 millionths of an inch in one inch. Put that into perspective. If the part was 500 inches in diameter you were out 1 thousandth of an inch. That is precise machining! Sounds like your old boss didn't understand the metric system, or he was blaming you for his error. Australia converted to metric in 1970, and doing metric/imperial conversion is like eating breakfast for many here. It is a daily occurrence. I am old enough to be proficient in both systems, but give me metric any day. I use 25.4 mm/inch. With the level of accuracy required for porting an engine with hand tools, it doesn't matter whether you use 25.4 mm/inch or 0.03937 inch/mm.
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11-28-2013, 06:29 AM #36Screaming And Flying!
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11-28-2013, 06:48 AM #37
Is that relevant?
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11-28-2013, 07:06 AM #38
Ha Whitworth should never had been "relevant". IMO Gary
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11-28-2013, 07:12 AM #39
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11-28-2013, 08:03 AM #40Screaming And Flying!
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Last edited by powerabout; 11-28-2013 at 08:05 AM.
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11-28-2013, 08:12 AM #41
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11-28-2013, 08:19 AM #42Screaming And Flying!
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the poms and yanks should have sorted it in 1700 something and we would have the best of both
metric is just a fudge to have decimal engineering threads, they are crap so we should have imperial threads and spanners but drill the holes with metric spacing as it works for that.
Half the population is female and other half male, that works
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11-28-2013, 12:10 PM #435000 RPM
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How bout the V4 block?
Thinking about using the Dave Bush 3.0L sleeves in the V4 Block.
Anybody out there done this ?
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11-28-2013, 12:16 PM #44
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11-28-2013, 12:28 PM #455000 RPM
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Maybe we can get this thread back on the OP's subject now. Captain, we've been getting some good info. Hopefully more will chime in with their experience and results. I've learned a lot so far and will be using the info to assist with my 2.7 Bridgeport overhaul.
1975 Hydrostream Ventura II
1987 evinrude 200xp