 One side of the engine cooler than the other |
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| tornik550 |
 Sep 3 2014, 07:09 PM
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#1
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Senior Member  Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None  |
I dhave been playing around with my 2258 4cyl (dual weber 44 Idf's). The car drives great. I installed a new 4 channel head temp gauge. I noticed that the 1/2 side of the engine was about 30 degrees cooler. I thought maybe there was simply faulty measurement so I did a bunch of measurements with an ir thermometer. I checked headers case, heads, intakes, tin... and all measurements were about 30 degrees cooler on the 1/2 side. I also looked at all the spark plugs and they all look about the same. The car runs very well however I have a slight pop on decel that goes away if I slightly enrich cyl 2.
Any ideas? The head temps and header temps are normal on the 3/4 side so 30 degrees low on 1/2 side. |
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Replies(1 - 8)
| VaccaRabite |
Sep 3 2014, 07:22 PM
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#2
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En Garde! Group: Admin Posts: 13,456 Joined: 15-December 03 From: Dallastown, PA Member No.: 1,435 Region Association: MidAtlantic Region |
3/4 side naturally runs a little hotter due to air flow under the cooling tins. Assuming you are using stock tins.
Zach |
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| dirk9141973 |
Sep 3 2014, 07:29 PM
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#3
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Unregistered |
QUOTE(tornik550 @ Sep 3 2014, 06:09 PM)  I dhave been playing around with my 2258 4cyl (dual weber 44 Idf's). The car drives great. I installed a new 4 channel head temp gauge. I noticed that the 1/2 side of the engine was about 30 degrees cooler. I thought maybe there was simply faulty measurement so I did a bunch of measurements with an ir thermometer. I checked headers case, heads, intakes, tin... and all measurements were about 30 degrees cooler on the 1/2 side. I also looked at all the spark plugs and they all look about the same. The car runs very well however I have a slight pop on decel that goes away if I slightly enrich cyl 2. Any ideas? The head temps and header temps are normal on the 3/4 side so 30 degrees low on 1/2 side. (IMG:style_emoticons/default/confused24.gif) are the flaps blocked on one side I found a piece of paper in tins |
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| tornik550 |
Sep 3 2014, 07:37 PM
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#4
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
QUOTE(dirk9141973 @ Sep 3 2014, 09:29 PM) QUOTE(tornik550 @ Sep 3 2014, 06:09 PM) I dhave been playing around with my 2258 4cyl (dual weber 44 Idf's). The car drives great. I installed a new 4 channel head temp gauge. I noticed that the 1/2 side of the engine was about 30 degrees cooler. I thought maybe there was simply faulty measurement so I did a bunch of measurements with an ir thermometer. I checked headers case, heads, intakes, tin... and all measurements were about 30 degrees cooler on the 1/2 side. I also looked at all the spark plugs and they all look about the same. The car runs very well however I have a slight pop on decel that goes away if I slightly enrich cyl 2. Any ideas? The head temps and header temps are normal on the 3/4 side so 30 degrees low on 1/2 side. (IMG:style_emoticons/default/confused24.gif) are the flaps blocked on one side I found a piece of paper in tins I suppose it's possible that there could be a problem with the tin. Why would the headers be cooler also if the problem was just the tins? |
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| stugray |
Sep 3 2014, 07:47 PM
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#5
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
The 3/4 side has the oil cooler on it.
That adds more heat to that side, and the cylinders get less airflow. |
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| tornik550 |
Sep 3 2014, 07:52 PM
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#6
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Senior Member Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None |
QUOTE(stugray @ Sep 3 2014, 09:47 PM) The 3/4 side has the oil cooler on it. That adds more heat to that side, and the cylinders get less airflow. Should I expect that the headers would also be hotter on the 3/4 side? |
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| ChrisFoley |
Sep 3 2014, 07:53 PM
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#7
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I am Tangerine Racing Group: Members Posts: 7,934 Joined: 29-January 03 From: Bolton, CT Member No.: 209 Region Association: None 
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Check your intake airflow at 3000 rpm to see if the 1/2 side carb is opening a little less than the 3/4 side carb. If one side of the engine is working harder it will be hotter.
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| stugray |
Sep 3 2014, 07:58 PM
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#8
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Advanced Member Group: Members Posts: 3,824 Joined: 17-September 09 From: Longmont, CO Member No.: 10,819 Region Association: None |
I also read on this forum somewhere while talking about timing:
Supposedly the stock distributor actually retards timing of just cyl #3 because it was known to run the hottest by the designers. I know of no reason for that or if it is a myth. I guess someone could check the lobes on the distributor cam. Supposedly running an aftermarket distributor or a some pertronix modules eliminates the few degrees for cyl #3. |
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| Jake Raby |
Sep 3 2014, 10:53 PM
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#9
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Engine Surgeon Group: Members Posts: 9,394 Joined: 31-August 03 From: Lost Member No.: 1,095 Region Association: South East States |
A 25-50* delta between the two banks of cylinders is normal and expected. This is due to the tangential flow of the cooling air as discharged from the fan in a clockwise motion.
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