I have almost finished building an engine using a XV1100 crankshaft and a bore of 102mm, which gives a total capacity of about 1225cc.  It also has custom higher compression JE pistons and Megacycle cams.  I am considering fitting an oil cooler due to the expected higher temperatures and am particularly concerned about the temperature around the exhaust valve area of the rear cylinder.

Some of the options that I am considering are;
- to take the feed for an oil cooler from where the banjos are that feed the oil lines to the head,
- to split the oil line after the cooler and run hoses to each head where a restrictor will maintain the oil pressure,
- to have the oil enter each head by means of a banjo adjacent to the exhaust rocker shaft instead of the inlet rocker shaft.  This should allow the cool oil to cool the immediate area before traveling to the cam and inlet rocker areas.  (The standard system heats the oil before it gets to the exhaust valve area.)

Questions:
- A search of this forum for information about oil coolers only brings up items from almost twenty years ago.  Is anyone using one, or have experience with an oil cooler on a TR1?
- What is an optimum size?
- Should I only cool the oil going to the rear cylinder? This would mean that the oil would travel through the cooler at a slower pace and be more efficiently cooled.  Or it could allow the use of a smaller cooler.
- Has anyone attepted reversing the oil flow in the heads in this manner before?  What was the result?


Comments, questions and advice are welcomed.

Hello gs58,
do you have the chart with the XV1000/TR1 Oil System? I have enclosed that one from the YAM "SupplementaryService Manual" Doc.:5A8-28197-80 from 1981.
As you can see, the both Cams s are conected to each other of each Cyl-Head.

The TR1 (or other Engines, based on XV750/XV1000 Design) are not famous for there exellent Oil Pressure. If you want to change some components of the original Layout, take in mind, that the lubrication system of this specific Engine layout is to handle with care.

Q1: during your engine overhaul works, do you have installed the bigger oil pump from XV1100 series?
Q2: How does the oil pressure must rise to compensate the higher compression forces on Crankshaft-Con Rods Bearings to manged there proper operation?

For your question about OilCoole layout and installation, ask the racer guys. Have a look at TAG "Racing" and/or "Strories"

With kind regards
Anja

There used to be a commercially available system by Derale - it's also how Sepp did it on his race bikes in the past - which included the oilcooler into the system by drilling and tapping the oilfilter cover.

I included the installation instructions as an attachment to my post.

Regards,
Greg

Seized camshafts result from the banjo bolt not beeing drilled, the oilpump not beeing replaced against the bigger one, the oilpump intake filter beeing clogged or from mounting the oil filter in the wrong direction. Drilling the banjo bolt to 2,5 mm can be to much, the oil pressure then may drop to low on idle.

Quote:

And therefore you want to deliver the cooled oil directly to the head, which is even hotter than the engine?

Drilling the banjo bolt to 2,5 mm can be to much
Thanks Hornschorsch, this could save me some angst.  What is the recommended size hole to drill?

Ali, my bike will be spending time on the track as well as being ridden spiritedly on the road, so keeping the rear cylinder as cool as possible is important to me.  I have stepped the exhaust headers to 45mm at about 80mm from the head to give better flow, they then join to a 52mm single pipe.  I will review this when the new engine is in the frame and may increase the diameter of the final pipe.

Cheers
Paul