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#509596 - 05/14/08 03:57 AM
Re: problems with the non-zinc oil - or is it a problem?
[Re: austinsailor]
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arcade
Member
Registered: 02/13/08
Posts: 19
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Hi , A most interesting serial.Now the oil problem is sorted what is the best petrol to put in my 39 Chrysler now it is up and running ie higher or lower octane.? I have had a couple of differing theories offered. I havnt used an additive as the engine has hardened valves I believe. I guess it has been covered many times but maybe things have changed again,thanks, Warwick.
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#511078 - 05/20/08 05:24 PM
Re: problems with the non-zinc oil - or is it a problem?
[Re: arcade]
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Bob Call
Member
Registered: 11/25/07
Posts: 36
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Warwick
Back in '39 when your Chrysler was new gasoline was about what is is now because those engines are low compression. I even remember white gasoline (unleaded) being sold at stations up into the early '50's. If your engine does not have hardened valve seats you may want to consider using a lead replacement additive
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#511169 - Yesterday at 01:13 AM
Re: problems with the non-zinc oil - or is it a problem?
[Re: Bob Call]
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arcade
Member
Registered: 02/13/08
Posts: 19
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Thanks Bob,thats very interesting. I have heard similar recollections. The Chrysler has hardened valve seats but I are not sure about my other pre 39s. Is it best to use the higher octane or the lower would you say. I have had differing opinions but am interested in any opinion,tks warwick.
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#511451 - Today at 12:52 AM
Re: problems with the non-zinc oil - or is it a problem?
[Re: arcade]
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brian
Member
Registered: 06/18/05
Posts: 79
Loc: Coquitlam, BC Canada
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Warwick:
All Chryco L-head engines from at least 1936 forward had hardened exhaust seat inserts, as unleaded fuel was the norm when the seats were first used. Thankfully, Chrysler never gave them up. To my recollection no other manufacturer used hardened seats until the advent of modern unleaded fuel and the emergence of the valve seat recession problem
In terms of high or low octane fuel, 87 octane is higher than the octane rating of the fuel when the engine was originally built, so there is no value whatsoever in using a higher octane - the engine simply cannot benefit from it.
Brian
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#511461 - Today at 02:52 AM
Re: problems with the non-zinc oil - or is it a problem?
[Re: brian]
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34 Dodge
Member
Registered: 03/28/04
Posts: 166
Loc: Encino, CA (Los Angeles)
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Brian,
It's my understanding that my 1934 Dodge was manufactured with hardened valve seats, an innovation that they instituted that year.
Ken Sobel
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