Frank Elder Posted February 22, 2009 Report Posted February 22, 2009 Mopar assembly lines were notrious for using whatever they had on hand.... Quote
Norm's Coupe Posted February 23, 2009 Report Posted February 23, 2009 I think I may have come up with the reasoning for two size bores on the master cylinder. Don't know if it's correct or not, but when you think about it, it makes at least a little sense. Plymouth used two different size brake drums as we all know. The 10" and 11" drum. The bore on my master cylinder is 1 1/8th inch, AND I have the 11" drums on my coupe, not the 10". Maybe they used the 1" bore on cars built with the 10" drums. Just thought I would throw that out there for a little more discussion and thought on the subject. Quote
Frank Elder Posted February 23, 2009 Report Posted February 23, 2009 Deductive reasoning, I'll play watson to your Holmes. Not bad Norm. Quote
1948Matt Posted February 23, 2009 Author Report Posted February 23, 2009 Will wonders never cease... My Ebay seller has contacted me and will be sending me the parts that I need. That kind of integrity is hard to find on Ebay. Quote
Norm's Coupe Posted February 23, 2009 Report Posted February 23, 2009 My D-24, 10" drums, 1 1/8" master bore, 1 1/8" wheel cylinder bore:)My D-42, same Well, I guess that sort of blew my theory out of the water didn't it. Anyone else have one? Has to be a real reason for two different size bores. They wouldn't have two different sizes for no reason at all. Would cost too much to have two different sizes manufactured when one would fit all. Matt, Nice to hear you are getting your problem solved. Quote
Young Ed Posted February 23, 2009 Report Posted February 23, 2009 How about a bad finish/bore when they tried for an inch so rather then toss the casting they just upped it an 1/8th? Quote
oldmopar Posted February 23, 2009 Report Posted February 23, 2009 The Desoto's S14 & S15 used the mc with a 1" bore the S13 used the 1-1/8 , All 3 used 1-1/8 wheel cylinders. Quote
Norm's Coupe Posted February 23, 2009 Report Posted February 23, 2009 The Desoto's S14 & S15 used the mc with a 1" bore the S13 used the 1-1/8 , All 3 used 1-1/8 wheel cylinders. Interesting. But........that still doesn't answer the question as to why they used the smaller bore on the S13. Must be some logical engineering answer for that. Was there a deference in the drum sizes between the S13 and the S14 & S15's? Or, the engine (straight 8 or six) or weight of the cars? Quote
oldmopar Posted February 23, 2009 Report Posted February 23, 2009 I though I had put the drum size but it is not there so yes the S13 had a 11" drum the S14 & 15 had a 12" drum. also states the the s13 wagon had the 12" drum Quote
Norm's Coupe Posted February 23, 2009 Report Posted February 23, 2009 Based on that, it sounds like my original theory of the 11" drums having the larger sized bore was on the right track. Don't know why Shel's Dodge was different, but possibly someone changed his over the years before he bought the car too, or someone changed his drums. We'll never know that answer. Quote
oldmopar Posted February 23, 2009 Report Posted February 23, 2009 It looks a smaller bore mc with the larger drum I am guessing the change was at 12" as Dodge used the 1-1/8 mc and wheel cylinders with the d29- d41 with 10" drums and d30-d42 with 11" drums. Ed Quote
Frank Elder Posted February 24, 2009 Report Posted February 24, 2009 d-22, front drum wheel cylinder bore 1 1/4 front shoe, rear shoe 1 3/8. Rear drums 1 inch rear shoe, front 1 1/8, M/C bore 1 1/8. 11 drums. How do you like them apples? Quote
Frank Elder Posted February 24, 2009 Report Posted February 24, 2009 d24, 1 1/8 front cyl.,back cyl., and M/C. 11 inch drums...Uniform across the board. Quote
Jim Saraceno Posted February 24, 2009 Report Posted February 24, 2009 NAPA online list two master cylinder kits for 54 Chryslers and Desotos. UP142 and UP143. It doesn't give details but would one of those be the 1" and the other 1 1/8"? Quote
1948Matt Posted February 24, 2009 Author Report Posted February 24, 2009 The 142 is the 1" and the 143 is 1 1/8". The 143 is what I had that didn't fit and they didn't have the 142 in stock. But since the seller is providing the parts, I don't have to order one now Quote
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