Bill - 29 Buick Posted July 26, 2015 Share Posted July 26, 2015 Anyone know what the "Dynaflash oil cushioned system" that Buick made from 1937 is all about ?Bill McLaughlin1929 McLaughlin Buick RoadsterSupporter of "All Together Parking by Era" Link to comment Share on other sites More sharing options...
LAS VEGAS DAVE Posted July 27, 2015 Share Posted July 27, 2015 i think it has to do with the noise a cold engine makes prior to 1937 until it warms up. In 1937 the rocker arm brackets were changed from cast iron to aluminum. The short explanation of that benefit is that the expansion of parts between the pushrods and rocker arm shafts now is about at the same rate which keeps the valve adjustment that was adjusted when the engine was at operating temperature constant as the engine reaches operating temperature from cold. This results in considerably less engine noise according to the Buick engineers. Link to comment Share on other sites More sharing options...
Matt Harwood Posted July 27, 2015 Share Posted July 27, 2015 I always assumed the "oil cushioned" term came from the switch from solid lifters to hydraulic. When did Buick make the change? Right around 1937, yes? Link to comment Share on other sites More sharing options...
LAS VEGAS DAVE Posted July 27, 2015 Share Posted July 27, 2015 I always assumed the "oil cushioned" term came from the switch from solid lifters to hydraulic. When did Buick make the change? Right around 1937, yes?Thats what I thought but I don't think the 38 SPECIAL has hydraulic lifters. If it had hydraulic lifters it wouldn't have any valve clearance would it? Link to comment Share on other sites More sharing options...
37_Roadmaster_C Posted July 28, 2015 Share Posted July 28, 2015 My 37 has solid lifters. I don't know when hydraulic became an option / standard. R Link to comment Share on other sites More sharing options...
Ben Bruce aka First Born Posted July 28, 2015 Share Posted July 28, 2015 (edited) My 37 has solid lifters. I don't know when hydraulic became an option / standard. R I believe with the advent of Dynaflo. Ben Edited July 28, 2015 by First Born (see edit history) Link to comment Share on other sites More sharing options...
Joseph P. Indusi Posted July 31, 2015 Share Posted July 31, 2015 LAS VEGAS DAVE: Please ask your Buick engineer friends why Buick stayed with differential ratios of 4.45 to 1 for so many years. I always surmised it was because Buick did not have an automatic transmission until 1948 so with a 4.45 to 1 rear end you could ride around town without shifting and clutching until you needed to come to a full stop. I would love to know the Buick explanation for this. Joe, BCA 33493 Link to comment Share on other sites More sharing options...
critterpainter Posted August 1, 2015 Share Posted August 1, 2015 Hydraulic lifters were used on the Dynaflow equipped only. Therefor the first cars to have hydraulic lifters were the 1948 Buick Roadmasters with Dynaflows, but NOT with 3 speed manual transmissions. Link to comment Share on other sites More sharing options...
Marty Roth Posted August 2, 2015 Share Posted August 2, 2015 Chris, Thank you for that explanation. You are correct. How is your '37 doing? Link to comment Share on other sites More sharing options...
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