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> engine tin removal
pda914
post Jul 28 2013, 12:45 PM
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Is it at all possible to remove the engine tin over the oil cooler and temp sensor without dropping the engine? I need to get at both the oil cooler top and I need to replace the temperare sensor.

If so what should I look out for?
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pda914
post Jul 28 2013, 04:10 PM
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I put a custom fuel injection setup and am using a megasquirt engine management system on it. It works fine but the cylindar head temp sensor is very nosy electrically, I will be replacing it with a type K themocouple together with a themocouple amp with offset correction and some op-amps to make it act like an thermister with a negative temp curve that the megasquirt expects. This will isolate the temp sensor from the engine ground that electrically noisy.

I had put an extra duct in the heater blower to go to the other side. It slipped off its mounting and got sucked into the impleler. I pulled a mess of wire with sheaded plastic out of the impeller and since that event the oil temp has been a bit warmer that before. Since I need to access the temp sensor on that side I can inspect the top of the oil cooler for plastic bits that may be blocking some of the area,


That front tin pieces you sold to me a few years ago has been installed and is working fine.
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JamesM
post Jul 29 2013, 12:51 PM
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QUOTE(pda914 @ Jul 28 2013, 02:10 PM) *

I put a custom fuel injection setup and am using a megasquirt engine management system on it. It works fine but the cylindar head temp sensor is very nosy electrically, I will be replacing it with a type K themocouple together with a themocouple amp with offset correction and some op-amps to make it act like an thermister with a negative temp curve that the megasquirt expects. This will isolate the temp sensor from the engine ground that electrically noisy.

I had put an extra duct in the heater blower to go to the other side. It slipped off its mounting and got sucked into the impleler. I pulled a mess of wire with sheaded plastic out of the impeller and since that event the oil temp has been a bit warmer that before. Since I need to access the temp sensor on that side I can inspect the top of the oil cooler for plastic bits that may be blocking some of the area,


That front tin pieces you sold to me a few years ago has been installed and is working fine.



How much noise are you talking about? I assume you are using the CHT for the coolant temp signal in Megasquirt. If so then you most likely are only using this for warmup enrichment in which case you would need a pretty major swing in the sensor reading to actually have a problem, so aside from getting nice pretty graphs in your data logger I don't know what else you would be accomplishing here by changing your sensor..

How bad are the fluctuations in the reading? I run the stock CHT sensor grounded its normal way through the block without issue.

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pda914
post Jul 29 2013, 01:28 PM
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I've noticed general 70-80 deg F swings and occasional enough of a change to start the warm up enrichment when the CHT is over 300F.

I've added extra grounding from block to frame but have not tracked down noise any more.



QUOTE(JamesM @ Jul 29 2013, 01:51 PM) *

QUOTE(pda914 @ Jul 28 2013, 02:10 PM) *

I put a custom fuel injection setup and am using a megasquirt engine management system on it. It works fine but the cylindar head temp sensor is very nosy electrically, I will be replacing it with a type K themocouple together with a themocouple amp with offset correction and some op-amps to make it act like an thermister with a negative temp curve that the megasquirt expects. This will isolate the temp sensor from the engine ground that electrically noisy.

I had put an extra duct in the heater blower to go to the other side. It slipped off its mounting and got sucked into the impleler. I pulled a mess of wire with sheaded plastic out of the impeller and since that event the oil temp has been a bit warmer that before. Since I need to access the temp sensor on that side I can inspect the top of the oil cooler for plastic bits that may be blocking some of the area,


That front tin pieces you sold to me a few years ago has been installed and is working fine.



How much noise are you talking about? I assume you are using the CHT for the coolant temp signal in Megasquirt. If so then you most likely are only using this for warmup enrichment in which case you would need a pretty major swing in the sensor reading to actually have a problem, so aside from getting nice pretty graphs in your data logger I don't know what else you would be accomplishing here by changing your sensor..

How bad are the fluctuations in the reading? I run the stock CHT sensor grounded its normal way through the block without issue.

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JamesM
post Jul 30 2013, 04:29 PM
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This could also be partly (or completely) due to the thermistor table you are using, depending on how it is setup if the resolution is in the wrong place you could see large jumps in readings from a minor change in the sensor resistance.

which temp sensor (part number) do you have and what values did you use when you created the sensor table?

Did you measure the values of your own sensor or did you copy someone else?




QUOTE(pda914 @ Jul 29 2013, 11:28 AM) *

I've noticed general 70-80 deg F swings and occasional enough of a change to start the warm up enrichment when the CHT is over 300F.

I've added extra grounding from block to frame but have not tracked down noise any more.



QUOTE(JamesM @ Jul 29 2013, 01:51 PM) *

QUOTE(pda914 @ Jul 28 2013, 02:10 PM) *

I put a custom fuel injection setup and am using a megasquirt engine management system on it. It works fine but the cylindar head temp sensor is very nosy electrically, I will be replacing it with a type K themocouple together with a themocouple amp with offset correction and some op-amps to make it act like an thermister with a negative temp curve that the megasquirt expects. This will isolate the temp sensor from the engine ground that electrically noisy.

I had put an extra duct in the heater blower to go to the other side. It slipped off its mounting and got sucked into the impleler. I pulled a mess of wire with sheaded plastic out of the impeller and since that event the oil temp has been a bit warmer that before. Since I need to access the temp sensor on that side I can inspect the top of the oil cooler for plastic bits that may be blocking some of the area,


That front tin pieces you sold to me a few years ago has been installed and is working fine.



How much noise are you talking about? I assume you are using the CHT for the coolant temp signal in Megasquirt. If so then you most likely are only using this for warmup enrichment in which case you would need a pretty major swing in the sensor reading to actually have a problem, so aside from getting nice pretty graphs in your data logger I don't know what else you would be accomplishing here by changing your sensor..

How bad are the fluctuations in the reading? I run the stock CHT sensor grounded its normal way through the block without issue.


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Posts in this topic
pda914   engine tin removal   Jul 28 2013, 12:45 PM
914itis   Yes you can . You will have to remove all fuel in...   Jul 28 2013, 01:18 PM
The Cabinetmaker   Two questions. 1. Why do you need access to the ...   Jul 28 2013, 03:32 PM
pda914   I put a custom fuel injection setup and am using ...   Jul 28 2013, 04:10 PM
JamesM   I put a custom fuel injection setup and am using...   Jul 29 2013, 12:51 PM
pda914   I've noticed general 70-80 deg F swings and oc...   Jul 29 2013, 01:28 PM
JamesM   This could also be partly (or completely) due to t...   Jul 30 2013, 04:29 PM
Dave_Darling   In that case, get both sides. There's likely ...   Jul 28 2013, 04:31 PM
stugray   Why would you : why wouldnt you just replace it ...   Jul 28 2013, 04:39 PM
pda914   I will be replacing it with a type K themocouple t...   Jul 28 2013, 05:19 PM
pda914   I thnk drilling out an old thermister and tring to...   Jul 28 2013, 05:36 PM
The Cabinetmaker   Do you have an other than stock temp sender?   Jul 28 2013, 04:45 PM
pda914   yes I willl be using a thermocouple not the standa...   Jul 28 2013, 05:20 PM
stugray   True. Can the megasquirt read from this digital...   Jul 28 2013, 05:28 PM
pda914   The megasuirt uses an AD that reads from an anolog...   Jul 28 2013, 05:52 PM
stugray   I have been experimenting with the innovate TC-4. ...   Jul 28 2013, 08:14 PM
pda914   Four channels would be nice.... I hope one is rep...   Jul 28 2013, 09:40 PM
stugray   I havent hooked up the CHT yet or run the engine...   Jul 29 2013, 09:18 AM
Cap'n Krusty   Is it at all possible to remove the engine tin ov...   Jul 29 2013, 10:08 AM
The Cabinetmaker   " since that event the oil temp has been a ...   Jul 29 2013, 12:36 PM
pda914   Nope the cylinder head temp (Temp II) ...   Jul 29 2013, 01:59 PM
The Cabinetmaker   Nope the cylinder head temp (Temp II) ...   Jul 30 2013, 06:09 PM


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