Topic: CB750 oil line diameter

[dakeddie]

Does someone have a spare oil line they could measure for me?  I'm interested in the inside diameter of the part that fits into the bottom case (see pic).

The reason I want to know is that I'm going to make myself an aluminum oil tank and I want to plumb it with AN fittings.  Those are the nice Aeroquip stainless braided hose ones, although there are many other manufacturers of AN fittings.  I dont' really want to drain my oil just to measure the fitting.

Thanks!

[754]

We used to cut them off , remove the crimped part & weld on an AN fitting, probably a 6?..hole is around 10mm.

Another option, and Santee used to sell these is to bolt a plate on using the 4 bolts and o-rings. Then drill holes where the oil holes belong and tap to pipe thread and use 90 degree AN,s or hose barbs.

[Jinxracing]

I'm not sure what size stock is, but would love to know for the same reason...I'm building my own tank too and will be plumbing it with AN fittings from Earl's.

Something I learned recently that I thought I'd share: what the "dash" ( - ) numbers mean as far as AN size is concerned. The number represents the number of sixteenths of an inch that line measures in outside diameter in hard-line form. As an example, a -10, ("dash ten") AN line measures 10/16", or 5/8" across the outside diameter of a hard section of fitting; the hard wall thickness must be subtracted to get the true inside diameter of the line. I also found out that "AN" is short for "Army/Navy".

For other esoteric and often useless but always interesting (to me anyway) fastener and plumbing information read this book:

http://www.amazon.com/Fasteners-Plumbing-Handbook-Motorbooks-Workshop/dp/0879384069/ref=sr_1_1?ie=UTF8&s=books&qid=1207632754&sr=8-1

If you're familiar with Smith's other books, "Tune to Win" and "Race to Win", he wanted to title this one "Screw to Win" but the publisher was having none of it.

[754]

Then they are 8 or 10.. I forgot how they are sized.

 no matter ...go by the hole size shown in the pic.

Stockers sure are fat for such a small hole..

[lordmoonpie]

Oil line size from Earls is AN -10 or ID 9/16". I used Perform-o-flex for my hoses, earls part no. 400100. All you need do is get lengths of this plus the nice end caps to tidy it up and just cut the old swaging off the original fittings to re-use them. Works a treat plus that allows you to polish up the alloy on the original fittings.

If you use a Bartel/Mead Speed type oil tank and want standard lines to the engine you will need:
20.4cm and 23.4cm lengths of 400100 and I used chrome econofit hose tidies at each end - so you'll need four off 900310 13/16" fittings.

If you have an oil cooler and want to plumb that in, you'll need the standard input line from the oil tank to the cases as above (can't recall which length that was right now!) plus additional lines of length 71.4 cm and 107.5cm and a couple more hose tidies...

If you're making your own oil tank I guess you'll just have to measure the lot yourself

[dakeddie]

Thanks for all that.  I was planning on using -8 hose cause I read that the stock hose was 1/2" ID... but then I guess the -8 hose is actually ~7/16" ID to make it fit snuggly over the fitting.

I think I'll make up a couple adapters to replace the two stock fittings and then use two 90deg swivels.  Fitting a -8 into the adapter plate might be a tight squeeze, so that's why I was asking about the ID of the stock fittings.  Then I can get a -6 to -8 adapter.  But then if I should be using -10 hose, that screws up my plans.

Jinx, does Smith's Screw to Win book have any dimensions of AN fittings in it?  Designing something that will fit is really hard to do when none of the manufacturers provide even basic dimensions of their fittings.  You'd think the internet would be littered with AN spec drawings... I can't find any!

[754]

Earls supply may list the sizes.

It almost looks to me that you could cot the fitting at the 90 on the aluminum, and maybe tap right into the hole with pipe thread, then thread the 90 into the aluminun piece.

[lordmoonpie]

Yes - Earls website lists the sizes of the hoses and fittings - just not the stock honda ones obviously...

[754]

I went and loked, yjey do not list hole size. I think we need bore size of -8 fitting and -10... and bore size of stock fitting where it enters motor.

I am going to the shop soon will measure some of that, but cant post back till 2nite..

I could make from billet a piece that bolts on to the motor using stock fasteners or sunk in allen heads, then tap the proper thread into that to take a pipe thread AN 90 degree fitting.

[Jinxracing]

Jinx, does Smith's Screw to Win book have any dimensions of AN fittings in it?

Yes, it does, or you can go to the Earl's site like Lordmoonpie suggested.

Another good idea would be to just call Earl's. When I've spoken with them on the phone they've been very helpful and knowledgeable. The process of fitting real-deal AN fittings is a little trickier than I thought at first glance; a phone call to an expert helped a ton!

Good luck, and be sure to post pictures and a description of the project!

[dakeddie]

Ok, great...  I finally found the technical specs on Earl's website.  What was throwing me off was that I was going to the UK site.  For the record, the dimensions are found at http://www.holley.com/data/Catalogs/Earl's%20Technical%20Info.pdf.

[754]

I could not find hole size anywhere that I looked, just pipe and tube size.

Then I dug out some oil lines the hole measures approx .410 or 10.5 mm. I had a good look at the situation, and came up with this.

 After you cut off the crimp collar and remove hose we used to weld on an AN fitting.. but.. I thought up a new plan. I think I could build a fixture to thread these on the lathe, then cut the taper.same as an AN fitting!... no welding.. and very clean looking!

 The one fitting is not at 90 degrees, that one is a bit trickier , but I can get around that.