GSF 1200 Bandit - Cam cover Oil feed Adaptor ?

[george 1100]

Water cooling is superior to oil cooling which allows for more higher reliable horsepower. 

[Dezza]

An oil cooled engine fitted with an additional head cooler is a lot 'cooler'  than a water-cooled engine

[george 1100]

Oil cooling produced a lighter engine package at the time but with the advent of technology, components became lighter and water-cooled engines were no longer a weight burden. 

Suzuki or in fact any other motorcycle manufacturer could've easily designed a huge 2 compartment oil cooler where a water radiator is normally located. Gotta ask, why didn't they?

I even remember and article where Suzuki had to move to water-cooling in order to compete in the performance stakes.

[spiderpig]

On 2/21/2025 at 1:26 PM, fatblokeonbandit said:

Im tight and do things the cheap way, drill and tap the rockerbox cover and use straight adaptor and then what ever fitting you want depending on position of the head cooler.

 

 

 

 

What size did you tap for the straight connectors FB? Seeing 12 up to 16 for an6

[fatblokeonbandit]

2 hours ago, spiderpig said:

What size did you tap for the straight connectors FB? Seeing 12 up to 16 for an6

I think it was 12 mm, and i bored out the fitting to be the same internal diameter as ther original fittings, it worked really well.

[Gixer1460]

10 hours ago, Buzuki said:

I don't remember exactly where but Suzuki gave that information back in 1985 when it presented the first GSX-R750 model, I think it was about 52 liters per minute of engine oil flow through the engine head at full throttle, when I check I'll come back here to confirm or refute this claim of mine, In any case it was never clear to me why this extraordinarily simple and efficient engine cooling system was not applied to subsequent generations of much more compact GSXR engine units ?, but they switched to much more complicated water cooling system.

Water has better heat transfer properties - it picks up heat faster, and cools as quickly, its a natural for coolant - other than it freezing when really cold LOL!

[Gixer1460]

2 hours ago, spiderpig said:

What size did you tap for the straight connectors FB? Seeing 12 up to 16 for an6

Not sure AN6 is sufficient! Its bore is only 1/4" which seems small when compared to the std Y pipe? As its flow that matters, bigger is better so i'd use -8

And for info, all AN fittings have imperial threads and tapers - useful reference here - https://www.speedingparts.co.uk/i/guides-and-information/an-fittings-and-hose/an-fittings-measurement-a-guide-to-the-right-size.html 

[dupersunc]

-6 into -8  works fine.   AN-6 is 3/8" bore.

 

  I'd use a 1/4 npt thread if tapping the cam cover like FBOB did, then a 1/4 npt to -6 male/male adaptor.

Edited 9 hours ago by dupersunc

[Dezza]

Even when the feed to the cam cover is -6, the hoses are a tight fit if routed to come up between the carb rubbers, so depending on the carb/rubber combo, -8 hoses may not fit. As far as I am aware the specialised cam cover block fittings are almost all -6 and the internal bores, and that of -6 hose, look a bit bigger than the OEM Suzuki pipes.

[spiderpig]

27 minutes ago, dupersunc said:

-6 into -8  works fine.   AN-6 is 3/8" bore.

 

  I'd use a 1/4 npt thread if tapping the cam cover like FBOB did, then a 1/4 npt to -6 male/male adaptor.

The straight adaptors are all available in metric fit, saves me buying more taps. Npt for better sealing? 

[dupersunc]

13 minutes ago, spiderpig said:

The straight adaptors are all available in metric fit, saves me buying more taps. Npt for better sealing? 

Yes, though a copper washer should work fine.

[fatblokeonbandit]

I use Dowty seals as they are free at work

[Gixer1460]

7 hours ago, dupersunc said:

-6 into -8  works fine.   AN-6 is 3/8" bore.

Not according to here? - AN6 is 3/8 external over the threads (from link above).

AN-hose end inner diameter

An approximate internal dimension of AN hose ends is presented here. Note that the internal dimensions of hose ends and fittings may differ depending on the type, material manufacturer, etc. Therefore, these internal measurements should only be used as guidelines.

AN4 = ~3,7mm
AN6 = ~6,0mm
AN8 = ~8,6mm
AN10 = ~11,1mm
AN12 = ~14,3mm
AN16 = ~19mm
AN20 = ~25mm

[dupersunc]

I tend to measure what I have in ftont of me.