Do I need a cooler?
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Road Captain
Joined: Aug 2018
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From: Stockholm
Do I need a cooler?
I have a Dyna 2006 which I am rebuilding this winter. It will, upon the Andrews 26 it received last winter, get a big bore. The cylinders, which are at a machine shop here in Stockholm, Sweden, are to be bored to 3.938 (98 ci).
I plan to follow the S&S recommendations of having a big fan on the engine during the upstart process.
But my question is: Will the bike, after the big bore is installed, be more prone to overheating than before? If so, should I install a fan or an oil cooler?
I guess many of you have bored your Twin Cam 88 either to 95 or 98. What is your experience? Did your bike get hotter?
In my case I do not want to push the compression too hard and I have calculated it to become 1:9.6 static and 1:9.0 calculated.
Thanks in advance for sharing your knowledge.
Best Regards
Oak Mountain Rider
I plan to follow the S&S recommendations of having a big fan on the engine during the upstart process.
But my question is: Will the bike, after the big bore is installed, be more prone to overheating than before? If so, should I install a fan or an oil cooler?
I guess many of you have bored your Twin Cam 88 either to 95 or 98. What is your experience? Did your bike get hotter?
In my case I do not want to push the compression too hard and I have calculated it to become 1:9.6 static and 1:9.0 calculated.
Thanks in advance for sharing your knowledge.
Best Regards
Oak Mountain Rider
Last edited by OakMountainRider; Feb 13, 2023 at 09:01 AM.
You'll be fine without one. But it does not hurt to add one.
You would see a benefit though; an oil cooler will help keep the oil temps cooler and more stable thus providing a little more and more consistent performance in hotter temperatures and on longer and harder runs.
I've got a 103 with cams and tuned and it has basically the same amount of cooling capacity as your 88" and it doesn't have any heat problems other than the performance degradation on very hot days is notable, but that's a given with any air cooled engine and did just the same when bone stock. I have a Jagg oil cooler I will be putting on it before summer hits again, to help stave off the performance degradation on hot days.
You would see a benefit though; an oil cooler will help keep the oil temps cooler and more stable thus providing a little more and more consistent performance in hotter temperatures and on longer and harder runs.
I've got a 103 with cams and tuned and it has basically the same amount of cooling capacity as your 88" and it doesn't have any heat problems other than the performance degradation on very hot days is notable, but that's a given with any air cooled engine and did just the same when bone stock. I have a Jagg oil cooler I will be putting on it before summer hits again, to help stave off the performance degradation on hot days.
Last edited by 2500hdon37s; Feb 13, 2023 at 09:35 AM.
Thread Starter
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Road Captain
Joined: Aug 2018
Posts: 589
Likes: 93
From: Stockholm
You'll be fine without one. But it does not hurt to add one.
You would see a benefit though; an oil cooler will help keep the oil temps cooler and more stable thus providing a little more and more consistent performance in hotter temperatures and on longer and harder runs.
I've got a 103 with cams and tuned and it has basically the same amount of cooling capacity as your 88" and it doesn't have any heat problems other than the performance degradation on very hot days is notable, but that's a given with any air cooled engine and did just the same when bone stock. I have a Jagg oil cooler I will be putting on it before summer hits again, to help stave off the performance degradation on hot days.
You would see a benefit though; an oil cooler will help keep the oil temps cooler and more stable thus providing a little more and more consistent performance in hotter temperatures and on longer and harder runs.
I've got a 103 with cams and tuned and it has basically the same amount of cooling capacity as your 88" and it doesn't have any heat problems other than the performance degradation on very hot days is notable, but that's a given with any air cooled engine and did just the same when bone stock. I have a Jagg oil cooler I will be putting on it before summer hits again, to help stave off the performance degradation on hot days.
Thread Starter
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Road Captain
Joined: Aug 2018
Posts: 589
Likes: 93
From: Stockholm
No, I have never measured the oil temperature, as I have not found a good temperature oil stick for my bike. But I can supervise the engine temperature when having Power Vision on.
My question was to those who have bored their cylinders from 88 ci to 98 ci if they have noticed any difference in heat. (Has it gone up or down after the big bore?) I am, in the process of installing the big bore this winter, trying to decide wether I should order a cooling system or not.
Of course I am specially concerned about controlling the heat developement during the break in period.
My question was to those who have bored their cylinders from 88 ci to 98 ci if they have noticed any difference in heat. (Has it gone up or down after the big bore?) I am, in the process of installing the big bore this winter, trying to decide wether I should order a cooling system or not.
Of course I am specially concerned about controlling the heat developement during the break in period.
Last edited by OakMountainRider; Feb 13, 2023 at 04:16 PM.
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Road Captain
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From: Stockholm
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Of course I am specially concerned about controlling the heat development during the break in period.
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Thread Starter
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Road Captain
Joined: Aug 2018
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From: Stockholm
Last edited by OakMountainRider; Feb 14, 2023 at 08:45 AM.
Tourer
Joined: May 2011
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From: Alberta
My view is that any air cooled bike can benefit from an external oil cooler with a thermostat. On my bone stock 2008 Heritage Softail it lowered the oil temp from 270 F to 250 F under the same high heat conditions. That may not sound like much but it is a significant reduction. On my old 98 Electra Glide, I managed to find a brand new old stock HD factory oil cooler for a good price, so I installed it this winter.
The climate I live in is similar to yours and it is my opinion that you should install one, just make sure it has a thermostat. That way the oil temps won't get too low when its cold. You've gone to all that work and your engine will thank you.
The climate I live in is similar to yours and it is my opinion that you should install one, just make sure it has a thermostat. That way the oil temps won't get too low when its cold. You've gone to all that work and your engine will thank you.
