Pressurized oiling system.

Fullraceflathead

Fullraceflathead

Well-known member
I would like to set up my engine with a pressurized oiling system.
Is there a fairly simple set up people are using???
I realize the time to do this is when the engine is completely disassembled during an overhaul. Is it possible to drill the Model A crank for the connecting rod oiling?
Being new to the A's, I have not seen any articles on this subject.
 
Fullraceflathead,

What problem are you trying to solve ? If the engine stays with the stock setup, it would seem that the original oiling system works fine.

Marc
 
I have converted my motor to Mains pressure fed following the instructions of Charlie Yapp in "The Secrets of Speed" magazine.
I felt that it was quite a complex conversion including improving the performance of the oil pump.
I believe that the big ends are good for at least 3000rpm with the standard dipper set-up.
With shell bearings and an F150 overdrive gearbox, I'm hoping that my speedster will cruise comfortably at 60mph. (the motor has been considerably improved but yet to run)
 
DON'T DRILL A MODEL A CRANK SHAFT!
The original dippers work just fine up to about 5,000 rpm - more than you want to be doing with an A engine. The holes weaken the shaft some.
 
If you feel you MUST drill the crank be sure to have a professional (ie someone who has done it before) do it. The angle is very critical and there is not much room for error.
 
Model A dippers stop working somewhere between 3800-4000 rpm
You can drill the crank without a problem if you use the 3 angle method
You will need the use modern style seal on the rear main
there is a long list if work needed but it can be done
If you really want a full pressure engine go with B model engine
 
Fullraceflathead said:
I would like to set up my engine with a pressurized oiling system.
Is there a fairly simple set up people are using???
I realize the time to do this is when the engine is completely disassembled during an overhaul. Is it possible to drill the Model A crank for the connecting rod oiling?
Being new to the A's, I have not seen any articles on this subject.
Click to expand...

There are people here that can hep you but since this site is mostly for stock restoration the information in previous posts will be thin.

With that said, the secrets of speed magazine is going to be your best bet. There have been numerous article written, search for FULL PRESSURE OILING on their web site and then ask if anyone has a copy of that article.

http://www.secretsofspeed.com/secrets-of-speed-society
 
I will also endorse Jims book. & its also cheep to purchase, tons of info, Thanks for taking the time Jim to pass on your knowledge,
 
Fullraceflathead said:
I would like to set up my engine with a pressurized oiling system.
Is there a fairly simple set up people are using???
I realize the time to do this is when the engine is completely disassembled during an overhaul. Is it possible to drill the Model A crank for the connecting rod oiling?
Being new to the A's, I have not seen any articles on this subject.
Click to expand...

If pictures come thru, this shows one way of doing Model A block. You do NOT SAY which A or B block that you have for full pressure work ? Jim B book shows pics and tells how B block is to be done. And, B block is easier to make full pressure , because Ford already used pressure to mains in that block.
As far as drilling crank for full pressure, good luck if trying this yourself. Unless you are experienced , and good, at this....the job is best done by a crank shop, IMO. Otherwise, you may/will end up with what is in last picture and you do not need / want that, eh !
 

Attachments

  • 007.jpg
    007.jpg
    56.5 KB · Views: 244
  • 008.jpg
    008.jpg
    60.6 KB · Views: 422
  • 009.jpg
    009.jpg
    78.7 KB · Views: 219
  • 010.jpg
    010.jpg
    57.4 KB · Views: 188
  • 011.jpg
    011.jpg
    50.9 KB · Views: 198
  • 023.jpg
    023.jpg
    49.9 KB · Views: 244
I wouldn't have an A crank cross-drilled again either. Mine also ended up in two. Horrible noise when they go too...
 
DON'T DRILL A MODEL A CRANK SHAFT!
The original dippers work just fine up to about 5,000 rpm - more than you want to be doing with an A engine. The holes weaken the shaft some.

I third this. Model A cranks are not that strong to start with. I broke two at the hill climb. They were both done right. The A crank is fine for a stock engine, but weak for a very strong engine. Drilling them just makes it easier for them to break.

I'm not sure what RPMS the dippers stop working, but you won't be running 5000 RPMS long. The piston speed at 5000 RPMS with this long stroke engine is out of this world. The piston has to start and stop twice in every stroke, so good by crank.
 
If you are dead set on fully pressurized Mod "A" I would do it this way;
Start with counterweighted "B" crank (commonly mis-labeled "C")
Have the mains taken down to 1.85 dia with min .13 fillet rad.
Grind rod journals if necessary.
Drill for oil.
Block align bore for Saturn bearing in mains.
Use "B" rods of your choice.

John
 
Looking at the photos, I can't see a pressure reducing valve and I can't see how the valve chamber remains full of oil (probably my lack of engineering knowledge?)
The Charlie Yapp set-up has a 25lbs pressure reducing valve in the valve chamber and with the improved oil pump the excess oil is dumped into the valve chamber keeping it full of oil.
At least that's how it's supposed to work.
After much searching, I found that Charlie sold the appropriate pressure reducing valve for a very reasonable price
Keith
 
Also looking at the pics, I'm not sure i like the epoxy. Will this hold over time and vibration?
 
Kahuna said:
Also looking at the pics, I'm not sure i like the epoxy. Will this hold over time and vibration?
Click to expand...

Hey Kahuna,
Yeah, this A block was 'done' by a pretty well known A/B engine rebuilder. It was done a long number of years ago, put away and recently re-enlisted for work. It has a broken crankshaft that was drilled and the maker would be recognized by all here. I also question the epoxy use, but think that if used on clean metal it would adhere. BTW this crank broke one of the 'cut down' to A size rod throws ! I know, there are those here who state that this is a great and safe crank to use a cut down B crank. I would/will not spend any money on such a drilled crank. Heck , they cost a LOT of $ !
 
johnneilson said:
If you are dead set on fully pressurized Mod "A" I would do it this way;
Start with counterweighted "B" crank (commonly mis-labeled "C")
Have the mains taken down to 1.85 dia with min .13 fillet rad.
Grind rod journals if necessary.
Drill for oil.
Block align bore for Saturn bearing in mains.
Use "B" rods of your choice.

John
Click to expand...

Saturn bearing?

I've got the C crank and planned to take it down as you say, but not come across a reference to Saturn bearings before
 
Juggler said:
Saturn bearing?

I've got the C crank and planned to take it down as you say, but not come across a reference to Saturn bearings before
Click to expand...

You probably will not find a reference to one.

I did this a couple years ago for a Friend in his touring coupe.

It was the biggest bearing I could find that did not require moving the mains bolt holes nor require cutting a notch in the bolts.

You have to remember that most of the work done on Model A's was done a long time ago. I think the only Saturn back then was a planet.

John
 
You must log in or register to reply here.
Back
Top