Topic: Oil Cooler Thread

[kghost]

No thermostat here.

Its always hot here tho.

[markjenn]

If you're running the bike in cold weather, you probably will need to either run a thermostat or blank off the oil cooler to get the oil hot enough to steam off the moisture.  Generally, if your oil is consistently running < 180-deg F in cruise, you need to do something to get it hotter.

I'm not aware of any oil cooler thermos that are adjustable.

- Mark

[franklin1990]

            What do you think if you replace a cooler?

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Programmable Thermostats

[Shenanigans]

IS IT HUMAN? 

[LazerLoriel]

              You must know how to estimate in putting oil coolers on my 78 cb550k and my 72 750k.



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Programmable Thermostats

[Cyprusice]

I have bought a 1982 Nighthawk 650 recently that came with an Oil Cooler mounted were the horn use to be. I recently had an issue with one of the hoses blowing while riding down the highway and spraying my entire bike with oil due to the hose being compromised over time from the heat of header  . I would rather just not have the oil cooler and put the horn back on the bike and can't think of any reason why not to. Does any one have any knowledge as to why someone would have installed one in the first place and any reason to why not to remove it?

[ev0lution7]

OH NO NOT ANOTHER OIL COOLER THREAD

anyways just replace the oil cooler use a spacer and re-install the horn sometimes it works better than the "finger"

get heavy duty oil hoses from a hydrolic hose shop... they seem to work best the drag race guys use those hoses and they hold up to heat MUCH better.... and oil c00ler if used "right" wont hurt anything and it sorta looks k00l!
IMO..

[crazypj]

Coo, this thread is still running after 4+yrs
    

PJ

[fishhead]

Like this?
http://www5.ocn.ne.jp/~sbmr0201/

Scroll down to third picture. Then click on it for more closeups of the plumbing.
many people here have done it. I hope they pipe up as i'd like them to review the idea as well. Others I've seen take the hoses up over the top of the engine into a cooler with the spigots on top.

 I prefer to run my oil  lines up under the tank for a cleaner look

[brandEn]

Thread revival!

After searching the forums and reading 'most' of this thread I think it may be in my best interest to run an oil cooler on my new 836 kit . I like the Earls coolers and may run one of them. I see some people are running these and I was wondering how you mounted them? It looks like I would need to fab a bracket of some kind. Any pics to be shared would be great.

[HondaMan]

I have a 77 750 F (K engine transplant) that came with a lockhart oil cooler on it.  I'm wondering if I should move the oil cooler to the 78 CB750F to improve longevity of that engine.

That's a good plan, TT. That particular engine (and the 1977 counterpart) can also benefit from superior oils, including full synthetics, because there is not enough oil in those top ends. Honda restricted the flow in the 1976 and later heads a little, so as to increase the crank area flow. With the K engines it was OK, but with the F2/F3 it was not enough up there, and it was hot when it got there, from the black engine not cooling as well. The black did increase power by raising the temps in the upper area of the engine, but since the valve guides were the cast iron type they wore out quickly (especially the exhaust side) from the extra heat.

[ofreen]

Cool.  Just like Halley's Comet, this thread is back from beyond Pluto.

[faux fiddy]

Cool.  Just like Halley's Comet, this thread is back from beyond Pluto.

I was about to say. Perhaps a master's thesis in in order on water cooled bikes, and compare/ contrast how oil is not really the best flid for a cooling system.

[Bodi]

I have a Lockhart cooler on the 400F with a Yosh 466 kit and Megacycle street cam. It runs pretty damn hot even with the cooler, I did a bunch of temperature tests years ago but the data is long gone. I have a bypass thermostat, Lockhart too I think, but have never fitted it because there's no space to do it that it wouldn't look goofy. If I get masochistic and ride in really cold weather I cover the cooler with a rectangle of cardboard, but I haven't measured oil temperature with and without it in cold conditions.
I have seen coolers with bypass thermostats built in. They are pretty bulky, not bad on a dresser Harley but I think they would look out of place on a CB.
A filter adapter with the thermostat built in would be cool... Terry? The Lockhart one I have has what looks like a small version of a car coolant thermostat, about 1.5" diameter, in a simple case with 4 NPT ports and would just insert in the lines to/from the cooler. The thermostat element would fit in an adapter if it was a bit thicker than normal but how much thickness is OK before the filter hits the tire/fender?

[Patrick]

Might be time for another book, Hondaman. Clearly there is enduring interest in this subject....

Patrick

[Terry in Australia]

I have a Lockhart cooler on the 400F with a Yosh 466 kit and Megacycle street cam. It runs pretty damn hot even with the cooler, I did a bunch of temperature tests years ago but the data is long gone. I have a bypass thermostat, Lockhart too I think, but have never fitted it because there's no space to do it that it wouldn't look goofy. If I get masochistic and ride in really cold weather I cover the cooler with a rectangle of cardboard, but I haven't measured oil temperature with and without it in cold conditions.
I have seen coolers with bypass thermostats built in. They are pretty bulky, not bad on a dresser Harley but I think they would look out of place on a CB.
A filter adapter with the thermostat built in would be cool... Terry? The Lockhart one I have has what looks like a small version of a car coolant thermostat, about 1.5" diameter, in a simple case with 4 NPT ports and would just insert in the lines to/from the cooler. The thermostat element would fit in an adapter if it was a bit thicker than normal but how much thickness is OK before the filter hits the tire/fender?

Yeah mate, I've got a couple of those Lockhart thermostatic bypass valves here, I bought them for my bikes, but it never really gets cold enough in Oz to use them, and they cost silly money, for what they are. The rectangle of cardboard (or a leather cover) would be a better option, I'd think?

Hey, can anyone tell me what the OD of the front downtube on a CB400F frame is? I'm building a cooler kit for a member here, and need the OD for the radiator bracket. Cheers, Terry.

[Jerry Rxman Griffin aka MuthaF'er]

No I can't tell you that info but you can send me one of those valves 

[Terry in Australia]

No I can't tell you that info but you can send me one of those valves 

I'll swap you Jerry, you send me your "soon to be EX wife" and I'll send you a bypass valve, deal?

[faux fiddy]

No I can't tell you that info but you can send me one of those valves 

I'll swap you Jerry, you send me your "soon to be EX wife" and I'll send you a bypass valve, deal?

One would assume you pick up shipping costs for both items ?

[Retro Rocket]

No I can't tell you that info but you can send me one of those valves 

I'll swap you Jerry, you send me your "soon to be EX wife" and I'll send you a bypass valve, deal?

One would assume you pick up shipping costs for both items ?

You'd want to prepare for more than just shipping.....

[faux fiddy]

No I can't tell you that info but you can send me one of those valves 

I'll swap you Jerry, you send me your "soon to be EX wife" and I'll send you a bypass valve, deal?

One would assume you pick up shipping costs for both items ?

You'd want to prepare for more than just shipping.....

Still it seems just as expensive to load her in a trunk and shipped than it is on putting it in a plane.  I guess it's cheaper because 250 lbs. of MC parts don't  usually walk off the plane by themselves.

[GammaFlat]

Still it seems just as expensive to load her in a trunk and shipped than it is on putting it in a plane.  I guess it's cheaper because 250 lbs. of MC parts don't  usually walk off the plane by themselves.

15 yards.. unnecessary roughness..  ejected. 

[Jerry Rxman Griffin aka MuthaF'er]

You want her breathing or not? A little food might be all it takes to lure her onto the plane  She likes dark rum with her diet coke. How much extra do I have to pay? At least the bypass valve could come in handy  She might have a dowry too by the time the lawyers get done.

[HondaMan]

Might be time for another book, Hondaman. Clearly there is enduring interest in this subject....

Patrick

Yeah, I've thought of that...one of the things I'm addressing in this next book comes under the category "how to handle the excess [heat, stress, strain, leaks] that comes in these engines from adding HP to them".  clearly, Honda fell down a little on the valve guide side I'm sure the bean counters were involved with that decision, as it is too easy to fix otherwise) in the later engines. They did spend the monies to make better molds for the ports, at least, which really reduced the need for porting the engines made after 1975 (even the K6 heads benefitted from that one). But, the engine WAS designed after the Honda 90 and the 250/305 (CB72/77) series in most respects, including heat rejection (similarly, the 500/550/350F/400F followed the CB350/450 series), and adding power by increasing top end heat in those engines results in the same side issues. It was only from that experience that I learned what to do with the 750 when it came out. Mostly, it is just about improving the hot-seal capabilities and moving more heat from the exhaust valve into the head. I think it is pretty accurate to say that Honda only built 2 engines until 1980: the S90 and the DOHC450, but with varying engine cases and transmisssions.

[thehammer]

forgive me if this question has already been adressed, I have not read through all 35 pages of this thread. do these adapter plates make all the oil run through the filter each cycle, or would some go into the cooler and aroun the filter?