oil cooler - Honda Rebel Forum
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post #1 of 11 Old 05-17-2017, 10:11 AM Thread Starter
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oil cooler

I'm about to put a finned billet oil cooler on my chopped up rebel 450. I've read the forum on this in other sections here. They state not to put a oil cooler on because the oil pump can't handle the extra load! True or not? On the 250 rebs I maybe can see this but the 450 should be able to handle a oil cooler ID imagine! Your thoughts or experiences are welcomed and appreciated!
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post #2 of 11 Old 05-17-2017, 10:49 AM
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Welcome!

I'd be more concerned with the engine not getting enough lubrication if you put more resistance in the flow path. The oil pump may not notice the difference - just keep pumping happily away - but if you make it harder for the oil to flow through the system, less oil will flow through the system.

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post #3 of 11 Old 05-17-2017, 11:10 AM
 
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There's no engineering reason to put an oil cooler on a 450. These are typically needed and supplied by the manufacturer on larger engines with high heat release and power outputs where there is a large volume of oil that is not adequately cooled by the normal cylinder and head cooling system.
The manufacturer designs the oil circulation system to allow for any losses through an oil cooler where one is going to be fitted. The 450 was never designed to have one, so at best you would be using some of the designed in reserve oil pump capacity to supply the pressure drop through the oil cooler. All oil pumping systems use a pressure relief valve to regulate the maximum pump pressure and this requires excess pumping capacity beyond the necessary oil flow at the design pressure.
My inclination would be not to complicate the oil system by adding unnecessary components.

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post #4 of 11 Old 05-17-2017, 12:42 PM Thread Starter
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I understand it's not deigned or needed! But if a guy wanted to put one on do you think it could handle it! I've seen oil coolers for smaller engines than the 450. Additionally the oil cooler I have is pretty minimal as far as the extra oil volume! That's lines and all. Maybe an extra 1/4 of a quart ID say it's a single pass billet unit with 5/16 fittings. Placement would keep my lines short as well. I'm really wanting to give it a go. Mainly because you don't see em on rebels!
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post #5 of 11 Old 05-17-2017, 02:13 PM
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Since you know it may damage the engine but you obviously have an itch to do it anyway, why not mount it where it can be seen and not hook it up? Best of both worlds.
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post #6 of 11 Old 05-17-2017, 03:28 PM
 
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Originally Posted by thomasdoz316 View Post
I understand it's not deigned or needed! But if a guy wanted to put one on do you think it could handle it! I've seen oil coolers for smaller engines than the 450. Additionally the oil cooler I have is pretty minimal as far as the extra oil volume! That's lines and all. Maybe an extra 1/4 of a quart ID say it's a single pass billet unit with 5/16 fittings. Placement would keep my lines short as well. I'm really wanting to give it a go. Mainly because you don't see em on rebels!
Perhaps someone on here has done it and can offer you the benefit of their experience. If not, you could try it and let us know how it works out.

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post #7 of 11 Old 05-17-2017, 03:41 PM
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Why do you think you need an oil cooler?

Is the engine running hot?

Have you done some modifications that changed the air cooling, or causes the engine to run hotter?

Normal Rebels don't need an oil cooler, because they don't run hot. Does yours, and if so why?

Many air cooled engines do run hot if everything is not perfect, and those could benefit from an oil cooler, but I've never felt this way about the Rebel. Mine doesn't even get hot when sitting and idling for long periods, like my Harley's do.

Anyone else ever noticed a Rebel running hot unless it had a mechanical problem?

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post #8 of 11 Old 05-17-2017, 06:46 PM Thread Starter
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It's not a need to situation. My bike runs great! I liked the cooler thought it would be beneficial to the motor to try to cool the oil a little.
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post #9 of 11 Old 05-17-2017, 06:49 PM Thread Starter
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Have thought of hanging and not hooking up. Would make some sweet gun tubes off the front end. But I'd love for it to function.
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post #10 of 11 Old 05-17-2017, 07:41 PM
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It is not needed but if you want it you should first measure what the oil preasure is without the cooler at idle and through the rev range , Then do the same with the oil cooler connected .If there is a drop in oil preasure do not use it as it can damage your engine



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