External oil cooler - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 103 (permalink) Old 03-01-2014, 10:54 PM Thread Starter
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External oil cooler

OK OK OK!! I know my bike is dirty but for give me, PLEASE.
Alright people. I went out on the limb. We'll see if it can fly. I'm set on engine oil cools all internal parts but our bike engine was not given a way to cool the oil other than the bottom of the case having air blow over it. To try to help cool the oil I ordered an external oil cooler and an oil filter/cooler adapter from Ebay dealers. Bought another cool but was way to big for the area available for use without loading the coolant radiator with extra heat. Here is a small write up for your entertainment.


Part to be used is the oil cooler that is made of aluminum with 6 inches of 1/4 deep fins per side for cooling. Total of finned area is 12 inches but there is 20 inches of tubing altogether to remove heat. Has one mount tab at the top. Hoses connect at the bottom. The oil filter adapter mounts in place of the filter with the filter remounting on it.


First thing is to remove the filter for the adapter to be mounted.


This is a pain to do but is do-able. It is such a tight fit that the fittings had to be ground down on all edges to clear the engine casing, starter, and pressure sensor. The adapter is held in place by the center sleeve which threads on the old oil filter mount through the adapter and is threaded for the new filter location. Has a larger mounting surface so you can use a larger filter.


Filter reinstalled on the adapter.


Oil cooler supply lines have been added to the adapter plate.


Cooler is mounted using the top radiator cover bolt location. Had the purchase a 6 by 30mm bolt. Used two fender washers, one at the bolt head on the other at the cover itself. Used an old 10mm by 1/4 drive socket for a spacer until I can get a piece of chromed tubing. Used Locktite on the bolt.


Here is the finished product. $120 dollars in the setup including the 90 degree angle adapters for the filter adapter. All other fittings came with the parts.

Earlier in the day I started the bike and let the run for 10 minutes, while sitting on the lift. Out side temp were 57 degree. Fan came on at 6 minutes and again every minute after. Several hours later, after the cooler was added, I let the bike idle for 15 minutes while on the lift. From cold engine to fan coming on was 9 minutes. Outside weather temp was 61 degree. Cooler was hot to the touch. Fan came on again at 14 minutes. Hard to tell by the pictures but the cooler only touches the radiator cover at the mounting area. Tubes clear by 1/2 inch.
I don't have an oil temp gauge and will have to wait to warmer weather to know the out come.

Just know if you purchase this cooler you need to remove the mounting bracket bolts and add Teflon tape to prevent leakage. Mine was on the bike and in operation when I found this out.

Last edited by Chuck A.; 03-02-2014 at 08:51 AM.
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post #2 of 103 (permalink) Old 03-01-2014, 11:09 PM
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Nice work Chuck, can't wait to see prolonged results. It's cleaner then I expected, well done.


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post #3 of 103 (permalink) Old 03-01-2014, 11:19 PM
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That is a clean looking install there, Chuck. well thought out and if you wanted to you can actually put a brass tee where the oil pressure sending unit is and put an oil temp gauge on your bike as well.

I like the way that particular cooler doesn't cover the radiator and send hotter air through it to the radiator.From what I have read dropping the temp on engine oil not only increases the engine cooling on these engines but cooler oil adds to the life expectancy of your stators since the engine oil cools them as well. I have seen a mod somewhere on here or in Gypsy's writings that reroutes the oil lines internally to spray oil directly on the stator in order to cool it more efficiently. I am going out on the limb with you and say you have got a good thing going on there. I'll give you an "atta boy" on that one. Good idea and good looking install.




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post #4 of 103 (permalink) Old 03-01-2014, 11:19 PM
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I like it !


'86 VN750 13,700 mi -Stock
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post #5 of 103 (permalink) Old 03-01-2014, 11:23 PM
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It does look pretty clean. If you wanted you could even run stainless braided line to the cooler.

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post #6 of 103 (permalink) Old 03-01-2014, 11:25 PM
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Originally Posted by M_Angell View Post
It does look pretty clean. If you wanted you could even run stainless braided line to the cooler.
I think this is worthy of a sticky, Mike. I really do think it is an important issue that has been addressed well.




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VROC#30324
92 vn750(sold)
Current ride 05 1500 Classic FI
lovin' the new scoot



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"When all is said and done,usually more is said than done" UNK
Click on one x and drag to the other to read between them.

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XI waited patiently for the Lord; and he turned unto me, and heard my cry. X
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post #7 of 103 (permalink) Old 03-01-2014, 11:28 PM Thread Starter
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Thanks guys. I'm a hoping for the best. I did order a different cooler to start with,2002 Kawasaki 750 ZR H I'm thinking. It was as big as the VN 750 radiator. No real place to put it but I bet you could cool the engine without coolant.

Last edited by Chuck A.; 03-02-2014 at 12:04 AM.
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post #8 of 103 (permalink) Old 03-01-2014, 11:34 PM Thread Starter
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Originally Posted by denny6006 View Post
I think this is worthy of a sticky, Mike. I really do think it is an important issue that has been addressed well.
By all means, Please do! I don't have any idea how to so someone that can, Have at it!!
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post #9 of 103 (permalink) Old 03-02-2014, 12:24 AM
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Have to be a mod to sticky and I agree...sticky it is!

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post #10 of 103 (permalink) Old 03-02-2014, 02:46 AM
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i think this should also be in the project ad builds section, not here...
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