3 dip or 4 dip?

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Model T Ford Forum: Forum 2012: 3 dip or 4 dip?
Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Gruber- Spanaway, Wash. on Monday, July 09, 2012 - 07:34 pm:

I'm readying a rebuilt engine for my rusty '24 tudor.
I can use either pan. Not worried about correctness, but I am worried about 4th main support.
I think the 3 dip is stronger, but I've spilled enough blood to know what messing with #4 rod in a 3 dip is like.
I don't wanna join the two-piece crank club.
OK...which one should I use?
Thanks for your help.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Jack Putnam, Bluffton, Ohio on Monday, July 09, 2012 - 07:56 pm:

The three dip pan is definitely the stronger pan. The radius support on the 4 dip sticks out so far it easily bend the pan where it is attached. Also the design of the pan, for greater access to the rods, is weaker. All pans tend to bend in the area between the block and the transmission cover. There is less strength in this area with the 4 dip pans.
So the question remains--will I have to take up the rods and when? If set up correctly and the crank is truly round you should get several thousand miles before you need to remove any shims. Your decision now. JP


Top of pagePrevious messageNext messageBottom of page Link to this message  By Norman T. Kling on Monday, July 09, 2012 - 10:14 pm:

If you have a 26-27 engine and the reinforcements which go under the crankcase, and the two straps at the top and the 2 bolts into the top of the block you should be just fine with a 4 dip pan. It is quite a bit easier to adjust the 4th rod and even possible to adjust the 3rd main through the inspection plate. However, if you have an earlier engine, the 3 dip pan will be stronger, and it is correct for your year car.
Norm


Top of pagePrevious messageNext messageBottom of page Link to this message  By Royce in Dallas TX on Tuesday, July 10, 2012 - 06:51 am:

Really no problem adjusting rods on the three dip. You just have to position the rod advantageously. Much ado about nothing.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Terry Horlick in Penn Valley, CA on Tuesday, July 10, 2012 - 09:26 am:

I seem to remember that the 26-27 tranny will not fit into a 3 dipper due to the wider brake drum. If you have a '24 ( '25 or earlier) tranny then this isn't a concern.

TH


Top of pagePrevious messageNext messageBottom of page Link to this message  By Larry Smith on Tuesday, July 10, 2012 - 09:48 am:

Keep it right. The 4 dip came out in 1924, but I forget what month. Be sure the radius rod support isn't bent before installing it. I sent mine to a very well known T person on the west coast, and was charged $75 for straightening, and the support was still bent! He doesn't check them! I made a simple bracket from a rear horseshoe, and welded a ball to it. Now I can tell if the support is aligned properly.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Bob Gruber- Spanaway, Wash. on Tuesday, July 10, 2012 - 01:14 pm:

I'm going with the 3 dipper.
Thanks for the comments guys.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Roger Karlsson, southern Sweden on Tuesday, July 10, 2012 - 01:35 pm:

The encyclopedia gives july 18, 1924 as the starting date for the 4 dip pans. Model year 1925 started in august.
http://www.mtfca.com/encyclo/doc24.htm


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dave Huson, Berthoud, Co. on Tuesday, July 10, 2012 - 02:31 pm:

Bob Gruber:

If you drive every day and take a lot of long distance drives you are going to have to check your rods eventually. If you are under your car trying to check a motor with a 3 dip pan then you won't have to ask why some of us install 4 dip pans on earlier cars. If you have a garage queen then it makes no difference.


Top of pagePrevious messageNext messageBottom of page Link to this message  By Dan Treace, North FL on Tuesday, July 10, 2012 - 02:38 pm:

Roger

Just to show how the branches got the change in place, my '24 is original, motor date, Aug 26 1924, so it should be a '25 ..but has most '24 features, 3-dip pan, not the 4-dip started in July 18 1924... but large funnel oil tube and the hogshead with the 'cast in ridge' to flip more oil on the bands...begun in July 16 '24....go figure!




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