 Cyl 1-2 head running hotter, why? SOLVED!, 1,7 D-jet with NOS heads |
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| larss |
 Feb 28 2013, 03:59 AM
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Member  Group: Members Posts: 428 Joined: 10-September 09 From: Sweden Member No.: 10,787 Region Association: Scandinavia  |
The engine is a newely put together standard D-jet 1,7 with NOS heads, new piston rings, bearings, cam (std), adjusters and lifters. The rest are original components.
The engine runs really great, car pulls off like never before. Compression is about 155psi. Oil pressure good. Since I have higer valve noise from the cyl 1-2 head (most noticeable during warm up) I measured the valve cover surface temp just to see ift here was any difference. The 1-2 side was warmer all the time, at hot engine some 10-15C (~20F) hotter. Valve cover temp for cyl 1-2 side was about +100C (212F) when stopping. Checked for oil in both covers/rockers just after stopping, because oil should have great impact on the cooling, it looked the same, wet but not flooding. The flaps had just opened when I stopped so the termostate bellow works. Valve clearance set to 0.04/0.06 I/O as recommended by the cam manufacturer. What could make one side run hotter than the other in this case? /Lars S |
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Posts in this topic
larss Cyl 1-2 head running hotter, why? SOLVED! Feb 28 2013, 03:59 AM
Vacca Rabite All tin in place? Tin plugs in place?
Heads are c... Feb 28 2013, 09:48 AM
larss
All tin in place? Tin plugs in place?
Heads are ... Feb 28 2013, 09:59 AM 9146986 Is it possible that you installed the large air fl... Feb 28 2013, 10:22 AM larss
Is it possible that you installed the large air f... Feb 28 2013, 10:39 AM McMark I would expect the 1-2 side to have worse airflow ... Feb 28 2013, 10:56 AM ThePaintedMan
I would expect the 1-2 side to have worse airflow... Feb 28 2013, 11:19 AM larss
Note: you also wrote your clearance as 0.04 and ... Feb 28 2013, 11:25 AM Valy Did you check compression ratio on ALL cylinders b... Feb 28 2013, 11:04 AM JamesM If you have higher valve noise from one side i wou... Feb 28 2013, 11:09 AM larss
If you have higher valve noise from one side i wo... Feb 28 2013, 11:17 AM Jake Raby 3-4 always runs hotter in my experience, because i... Feb 28 2013, 12:56 PM larss
Where and how are you measuring temps?
Used a ... Feb 28 2013, 01:02 PM ThePaintedMan
3-4 always runs hotter in my experience, because ... Feb 28 2013, 01:35 PM Jake Raby In my cars with stock cooling I see a 40-70* F inc... Feb 28 2013, 01:40 PM larss After checking the compression (being equal for bo... Mar 6 2013, 11:37 AM Vacca Rabite Set it back to 700 rpm
at 900 you are already into... Mar 6 2013, 12:05 PM larss
Set it back to 700 rpm
at 900 you are already int... Mar 6 2013, 12:10 PM nathansnathan idle is 850 +/- 50. I would think there would be p... Mar 6 2013, 12:42 PM larss
I would think there would be problems with settin... Mar 6 2013, 12:47 PM 914_teener
I would think there would be problems with setti... Mar 6 2013, 07:29 PM nathansnathan
[quote name='larss' post='1830610' date='Mar 6 20... Mar 6 2013, 07:55 PM larss
Have you really checked everything?
Have you c... Mar 6 2013, 11:26 PM 914itis Deleted , got it. Mar 6 2013, 11:30 PM  |
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