Topic: oil cooler flow

[Don R]

 A recent question about the ttr400 oil cooler plate with its bypass holes got me thinking about oil cooler flow. I dug up my old thermostatic sandwich adapter plate and was trying to understand the flow. I did find a good video on youtube that explains it. It appears oil always can flow through the cooler but when the oil is cold, the bypass is open to allow oil to take an easier path through the bypass valve.
 My existing plate has -6 AN fittings and hose to and from the Lockhart cooler. That's a lot smaller than the stock oil tank lines. That said, this 836 has been a street race bike has had a Lockhart on it for decades, so I guess my concerns are already answered.
 It's a shame but the #2 pipe on the RC 4-1 header already rubs on an aftermarket filter housing. I have a stocker that has the fins in that location removed to try with the thin plate that's on it now, but no way will it allow the Thermostatic plate to fit, it's 5/8" thicker.

[grcamna2]

Following

[newday777]

Interesting on the fins hitting the RC #2 pipe with the Lockhart.
I have a K6 that had the RC pipe and Lockhart cooler but I don't remember noticing the #2 pipe hitting the oil filter housing. I lost all my tear down pictures from a phone swap.......
I'll have to look at the filter housing to see if the fins were cut off.

[Don R]

 I'm wondering if this may have been an early version of the RC header, you would think a lot of the hot rodded RC engineering bikes would have run into this same issue. The PO went to the shop in person to buy the RC goodies but I don't know when. 
 
  And before everyone tells me they don't need an oil cooler. I know, but it's an old street racer and it's too cool to not have one. Especially a nice Lockhart with the tag still on it.
  This oil cooler reportedly had a leather snap on cover for cold weather use. It was sold before I got to the vendor, I would have liked to have seen it at least. 
 
 

[Don R]

 Here it is with the stock cutaway filter housing. the new to me oil cooler. The old one had an awful chrome job on it.
  There's no chance I can get the thermostatic oil cooler adapter on it, being 5/8" thicker than this one.

[grcamna2]

Here it is with the stock cutaway filter housing. the new to me oil cooler. The old one had an awful chrome job on it.
  There's no chance I can get the thermostatic oil cooler adapter on it, being 5/8" thicker than this one.

Which part is 5/8" thicker ?

[RAFster122s]

Bill, Oil cooler adapter is 5/8” thicker... read back through the thread and you will see that...

[grcamna2]

Bill, Oil cooler adapter is 5/8” thicker... read back through the thread and you will see that...

David,I did read those words;the reason I ask this question is to clarify it so that it's clear just what those words mean to me.    I've been struggling with sleep deprivation for 4.5 yrs so certain things are more difficult than they should be for me.

Ah,the adapter for the oil cooler which sits under the oil filter housing;this is the reason for the header fitment issue ?

[RAFster122s]

Bill, Oil cooler adapter is 5/8” thicker... read back through the thread and you will see that...

David,I did read those words;the reason I ask this question is to clarify it so that it's clear just what those words mean to me.    I've been struggling with sleep deprivation for 4.5 yrs so certain things are more difficult than they should be for me.

Ah,the adapter for the oil cooler which sits under the oil filter housing;this is the reason for the header fitment issue ?

Or, the interference fit of the oil filter housing with the header pipes...
Too bad relocating the oil filter is problematic for a motorcycle, as that could solve the interference and potentially relocate the filter to a cool spot too.

[Don R]

 Yes, the existing oil filter adapter pushes the filter housing out against the header already. The thermostatic housing I'd like to use measures 1 5/8" thick, the one that's on it has no thermostat and is only 1" thick.
 I really wanted the thermostatic oil filter housing on the engine but it's that or the RC  header, both don't fit. I may drill the small bypass hole in the plate that's on it like the one TTR puts in his adapter. (That was mentioned in a different thread). I'd trade partial cooler flow for better oil flow in total.
  I spent 30 years writing job tickets for plumbing service, I developed a habit of leaving out words where I could, to save space. Sometimes I re-read my posts and see I still haven't broken that habit.

[newday777]

Don
How about adding an inline thermostatic bypass like Harleys use? I thought about that back in the 70s.
You can find them from $57-$200.

https://www.kartek.com/parts/derale-15719-oil-thermostat-for-bypassing-oil-cooler-12-npt-ports-bypasses-cooler-until-180f.html

[newday777]

This one in the link above you can mount on a down tube with straight line fittings and 90° or 45° to run to the opposite side how ever you want to plumb it up.
It has 4 bolt mounting holes for a bracket.

[Don R]

 That's an awesome idea. I hadn't seen them before.

[grcamna2]

That's an awesome idea. I hadn't seen them before.

The Derale thermostat seems much smaller than the Lockhart unit.

[Don R]

 The hose and fittings are scary expensive, my old hose was so hard I was afraid I'd damage the cooler installing it, so I rode over to the neighborhood race car shop. 4 feet -6 black braided hose with no fittings was close to $40.

[grcamna2]

The hose and fittings are scary expensive, my old hose was so hard I was afraid I'd damage the cooler installing it, so I rode over to the neighborhood race car shop. 4 feet -6 black braided hose with no fittings was close to $40.

I've used large diameter Gates rubber fuel hose in the past;I can see how the exhaust temps can cook that rubber fast.

[Don R]

 I got some 5/16" ID efi marine hose for my turbo project. It's re-enforced to handle the extra pressure.

[Don R]

  We veered off in the cold start throttle opening thread in the tech thread to talk about oil filter flow.
 
   I saw the diagram of the stock oil filter bypass in the bolt. It occurred to me that if a cooler didn't flow enough, the filter bypass might also be activated as if the filter was plugged.
  Cold thick oil making its way through the media might cause the bypass to operate. That made me wonder if an indicator could be made to tell when the bypass opens? Possibly a stem hooked to the bypass with an indicator going through a seal and out the end of the bolt.
 This proves it's usually better to just keep it original and trust the Honda engineers. L0L!