1981 16v 750 oil cooler idea...opinions?

[reddirtrider]

Think Hayabusas are crap too? cause they and all other modern bikes have plain bearings.
Edit: I got more:
18,000 rpm F-1 cars
Nascar engines
5,000 HP nitromethane Top Fuel Funny cars and dragsters

I don't suppose you noticed my laughing.

Crap in this case is relative. There's no doubt the roller bearing system is superior to a bearing system that relies on oil presure alone. The drawback is that it's heavier and more expensive to manufacture.

[reddirtrider]

Doesn't a top-end oiler just dump the oil on/around the cams?

The topend system came about as a solution to restricting the flow of oil to the cams when using oversized studs. It's nothing more than a solution to a problem developed by modifications. The stock system works just fine. They look cool, but the bottom line is unless you have oversized studs, they aren't necessary.

[reddirtrider]

If you're going to return the oil to the topend how about utilizing a topend oiler kit?

I agree that it's probably a better idea to route the oil return from the cooler to the bottom end, rather than the top, particularly now since I know the 750 doesn't use roller bearings.

There still is a hole in this entire scheme, and that is the cooler is only going to get a fraction (how much is debatable) of the oil flow.

[76FJ55]

If pulling the oil for the cooler off of the main galley and not routing it to the pressureized side of the cams you will very likely starve the cams and ruin the head. the 16V head is prone to this failure already so I would be very careful. I beleave the correct way to route a coole on an early 16v 750 requires the use of a redesigned oil filter cover plate. This is what I have on my 82 750. if you look at the filter area on the 750 case you will see that the pump supplies oil to a hole in the lowe side of the filter chamber. the existing cover dumps this oil to the outside of the filter element which it passes through and goes to the main galley. the cooler filter cover routes this oil through the cover to the cooler then back to the cover on the opposite lower side where it is supplied to the filter element. this setup will not change the oil pressure distribution through out the engine it mearly routes the oilfrom the pump through the cooler before it hits the filter and is distributed to the engine. If this doesn't make sense let me know and I will try to clearify. I could maybe try drawing you a skecth if necessary.

[makenzie71]

^I would love to see a pic of your cover when you change your oil again!

[76FJ55]

It'll be a bit before I have it off again but I can get pictures of the outside and using a pic of the OEM cover detail the mods you would need to do to an OEM cover to make it work. It would only take a little bit of welding or could probably even be done with some structural epoxy. the benefit is that if the epoxy fails the system will just short circuit the cooler go back to the filter as the original routing so no harm done if the epoxy fails.

[gearhead13]

this pic is from the flying banana site
It was made for a low pressure system, I have been told it would starve the high pressure engines for oil. There is an inlet on one side and an outlet on the other that you attatch your oil lines to. I think it could be used if you enlarged the hole.
Here is the link to the site:

http://www.theflyingbanana.com/oil-cooler.htm

[76FJ55]

OK here are the necessary mods to install an oil cooler on the GSX750.



The Red indicates where you will need to drill and tap for the fitting that flows out to the oil cooler.

The Green indicates where you will need to drill and tap for the fitting that returns the oil to the engine.

The Yellow indictes the area that needs to be filled in to force the oil to flow through the cooler.

the original set up flows oil out of the block at the area labled in red. the GSX750 cover does not have the wall in yellow. this can be seen in the cover on the right in gearhead13's picture. it then flows through the opening (not blocket by "Yellow" and to the outside of the oil filter, through the oil filter and into the primary oil galley.

with the modified setup the oil flows out of the block then is force to flow out the fitting in RED as the original path is blocked by the Yellow wall. it then flows through the oil cooler then to the fittingat the green location. It then flows through the opening on the side with the green fitting as it originaly had on the side that has now been blocked by blocked by yellow. After it flows through the opening it flows through the oil filter as originaly designed and to the main oil galley.

[76FJ55]

Here is a picture of the cover on my 16V GS750. Hopefully you can make out the oil lines among all the oily grime.

[Griffin]

I have a cover for a 16 valve GS750 already modified like that. It appears the "wall" around the red dot was made with some aluminum welding material. It was originally on an '82 GS750T. I bought it along with a cooler and a Lockhart thermostatic valve off ebay to install on my own GS750E, but decided I didn't want to mess with it.

I can take a pic of it tomorrow if you'd like.

[anikmankar]

oil

Did you compensate the oil in the cooler by adding more oil ?

Do send some more pictures...thanks