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> New engine rebuild running hot, Running Hot
57lincolnman
post May 27 2013, 12:39 PM
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Recently completed rebuild of 1.8L and it's running too hot. Oil temps climb to 230 with only about 10 minutes running. It doesn't matter how the engine is loaded. Items to consider: 1) case cleaned and checked for alignment; 2) LN pistons installed at 96mm with new Nickie cylinders; 3) cylinder heads (1.8L) cleaned and set for 8.25:1; 4) new connecting rods; 5) push rods check out OK; 6) car did not previously have thermostat or cooling flaps, so these were installed. Thermostat opens as it should at 180; 7) Air/fuel ratio is 12-14 and within spec; 8) engine timing within spec; 8) mild cam upgrade. 9) crankshaft and flywheel were balanced; 10) all engine tin is in place

Could it be that the engine cooling flaps are not working or reversed? All thoughts and commentary are welcome. This one has us baffled.
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avidfanjpl
post May 29 2013, 01:33 AM
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I doubt that it is a flaps issue. The pressure is so low that you could seriously harm something fast. I would not start it again until you have dropped it, taken out the pump, cooler and filter neck and seen if there is something wrong. Checking gaps sounds like you are already planning the motor drop. Sounds like a bomb ready to throw a rod or seize a piston. Air cooling problem with flaps only makes it hot. Not low pressure, if you are certain it is low, like 12lbs. That is less than 1 atmosphere. That cannot be good. My 911 gets to 55lbs. My 914's were always better than you are seeing.

I lost a motor at 3K rpm with about 10 seconds of low pressure and almost no time on the green oil idiot light being on. Burned a piston and fried the motor with bad oil flow and screwed timing. The piston caused the problem, but the failure of the circulation at the end roasted it good. I put it in neutral and when I stopped it, the motor never moved again until rebuilding. That was 1979 and it was on 30wt Kendall GT1 (Now owned by Brad Penn).

Be very careful until you are at least double the current claimed oil pressure, and even that is not so good. Install a HD oil pump after checking the cooler and oil filter assembly completely, and that means total removal. Cheap insurance on all 3 items is to check and replace.

You just spent way more on a motor. Nasty to spend it twice. Worse to lose the case and all that's in it.

I am working to be positive on the situation, but it scares me bad. The temperature is not the best indication of a problem in an aircooled motor. Oil pressure is god, temperature an irritating demigod.

John
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57lincolnman   New engine rebuild running hot   May 27 2013, 12:39 PM
billh1963   Recently completed rebuild of 1.8L and it's r...   May 27 2013, 01:24 PM
57lincolnman   Recently completed rebuild of 1.8L and it's ...   May 28 2013, 01:55 PM
timothy_nd28   Carb, or the original FI?   May 27 2013, 01:38 PM
57lincolnman   Carb, or the original FI? This is L-tronic 1.8L...   May 28 2013, 01:57 PM
Jake Raby   I have NEVER had any thermal control issues with a...   May 27 2013, 07:11 PM
57lincolnman   I have NEVER had any thermal control issues with ...   May 28 2013, 02:08 PM
r_towle   Sensor and gauge match?   May 27 2013, 07:14 PM
57lincolnman   Sensor and gauge match? This was the same set-u...   May 28 2013, 02:11 PM
jsconst   You list mild cam upgrade, and list "push rod...   May 27 2013, 07:51 PM
57lincolnman   You list mild cam upgrade, and list "push ro...   May 28 2013, 02:16 PM
mrbubblehead   what weight engine oil? could be high oil pressure...   May 27 2013, 08:40 PM
57lincolnman   what weight engine oil? could be high oil pressur...   May 28 2013, 02:18 PM
57lincolnman   what weight engine oil? could be high oil pressur...   May 28 2013, 02:18 PM
mrbubblehead   what weight engine oil? could be high oil pressu...   May 28 2013, 03:50 PM
worn   [quote name='57lincolnman' post='1870961' date='M...   May 28 2013, 06:06 PM
AE354803   if you are seeing low oil pressure and high temper...   May 28 2013, 10:54 PM
brant   The cooling flaps linkage can easily get over exte...   May 27 2013, 08:57 PM
'73-914kid   10-12 psi at 3400rpm is the things nightmares are ...   May 28 2013, 02:03 PM
timothy_nd28   what oil are you using? It could also be a bearin...   May 28 2013, 02:07 PM
57lincolnman   what oil are you using? It could also be a beari...   May 28 2013, 02:22 PM
timothy_nd28   Time being, you can adjust your air flow meter to ...   May 28 2013, 02:27 PM
avidfanjpl   I doubt that it is a flaps issue. The pressure is ...   May 29 2013, 01:33 AM
57lincolnman   I doubt that it is a flaps issue. The pressure is...   May 29 2013, 03:39 PM
timothy_nd28   :agree:   May 29 2013, 05:59 AM
Racer Chris   Harve, The problem has nothing to do with the cool...   May 29 2013, 06:47 AM
brant   its possible for a relief piston to stick in the b...   May 29 2013, 06:55 AM
injunmort   in earlier post you mention mild cam, are you sure...   May 29 2013, 07:07 AM
worn   in earlier post you mention mild cam, are you sur...   May 29 2013, 08:36 AM
57lincolnman   in earlier post you mention mild cam, are you sur...   May 29 2013, 03:30 PM
injunmort   the timing sheet that is supplied with the cam, a ...   May 29 2013, 09:09 AM
57lincolnman   the timing sheet that is supplied with the cam, a...   May 29 2013, 03:31 PM


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