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Username Post: 1952 3100 Proper Gasoline        (Topic#355906)
dougwilliams 
Poster
Posts: 1

Reg: 04-05-19
04-05-19 05:15 AM - Post#2763690    

From what I have researched. My Thriftmaster 216 was designed to run on non-ethanol gas with around 70 octane. Is that correct?




 


Gene_Schneider 
Ultra Senior Member
Posts: 12260

Loc: Wisconsin..USA
Reg: 09-27-02
04-05-19 06:30 AM - Post#2763692    
    In response to dougwilliams

Todays lowest octane is just fine. Additives are not necessary. We have had ethanol in this area for over 25 years and has never caused me a problem.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 
Bel Air kiwi 
Deceased Member RIP
Posts: 4558
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
04-17-19 05:23 PM - Post#2764435    
    In response to Gene_Schneider

Hi Doug, you are correct that the introduction of ethanol blends is newer than your engine design, however as Gene has said that's not a big issue.
It is more likely to affect old rubber parts in your fuel system than the engine.

What is probably more significant is that your engine was designed with the premise that the low-grade fuels of the time would all be bolstered with added lead. This was primarily an anti-detonant but is also useful as an upper cylinder lubricant. Particularly the valve to head or block face.

Without lead, you can get accelerated valve recession into the iron seats. To address this hardened valve seats were fitted and this was mandatory with aluminium heads.

However, it is not all doom and gloom as the funny thing about Iron is it work hardens in this area through the hundreds or thousands of heat cycles.
But if you find you are always loosing valve clearance then its probably an issue.
To prevent this don't run the engine really hard and you can buy upper cylinder lubricant you add to your fuel. It is a bit of a snake oil product but it does have some basis in science and may be all you need to do.

Cheers Kiwi

48 3100 RHD, 51 Deluxe 4DR RHD, 51 Bel Air parts car, 52 Bel Air P-Glide LHD. Others 23T, 32 Tudor, 58 Edsel pacer 4DR HDT, 79 F250 351C RHD. 69,70,82 Capri. No mobile, no TV, and no Jap cars.

"They made a desert and called it peace." Tacitus


 
Gene_Schneider 
Ultra Senior Member
Posts: 12260

Loc: Wisconsin..USA
Reg: 09-27-02
04-19-19 10:51 AM - Post#2764585    
    In response to Bel Air kiwi

I have never heard of a valve recession problem caused by unleaded gas. This goes for my cars (in the last 30 years) as well as many others.
Prior to 1950 most fuels regular grades did not have lead.

ChevGene 1934 Master sedan 1939 Master DeLuxe Town Sedan 1950 Styline DeLuxe Power Glide 1957 Nomad 283 PG 1963 Corvair Convertible


 


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