Fuel additive

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Jun 26, 2015 | 06:27 AM

67Rocket

Thread Starter

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Joined: May 2015

Posts: 344

From: Southern Virginia

Fuel additive

Do those of you who still run original engines without "hard" valve seats use any additives in your gas? If so, what do you use?

Jun 26, 2015 | 06:56 AM

oldcutlass

Administrator

Joined: Oct 2009

Posts: 42,495

From: Poteau, Ok

No, its not required. The seats don't wear much with todays fuel. You have to remember that the lead was added for the anti-knock characteristics and the bonus benefit was it somewhat coated the seats.

Jun 26, 2015 | 07:42 AM

D. Yaros

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Joined: Nov 2006

Posts: 1,918

From: SE Wisconsin

I don't often use a fuel additive, but when I do, I use TEL!

Jun 26, 2015 | 09:00 AM

Ozzie

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Joined: May 2009

Posts: 1,614

From: S.E. Louisiana, so far still in U.S.A.

I have four "antiques" with original engines currently. I don't use any fuel additive for the valves and, so far, there have been no valve problems.

Jun 26, 2015 | 09:04 AM

chip-powell

Registered User

Joined: Jun 2013

Posts: 1,402

From: Maryland

No additives for me. I just run 93 octane and have no knocks or problems in the last 2 plus years.

Jun 27, 2015 | 08:02 AM

sammieolds

Registered User

Joined: Mar 2010

Posts: 322

From: lexington sc

I never run any additives ,Do you run Enthole free or reg 93 octane
Steve

Jun 28, 2015 | 04:03 PM

Tedd Thompson

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Joined: Oct 2004

Posts: 7,743

From: Forest Ranch Ca.

I just run pump gas in my 327 Chevy powered Land Cruiser and have from the time we couldn't get leaded fuel sometime in the seventies. Probably 40,000 miles with no problems...Tedd

Jun 29, 2015 | 08:52 AM

tds

Registered User

Joined: May 2013

Posts: 197

From: Katy, Texas

I used Octane Supreme until I had the engine rebuilt. Not sure it needed it, but I did not have any problems. Since rebuild, I just use 93 at the pump. No problems.

Jun 29, 2015 | 09:23 AM

pogo69

morgan

Joined: Mar 2011

Posts: 1,925

From: CT

driving habits play into this for sure. my take is if your running it hard the valves will sink quicker without that little bit of lead. if your a moderate driver it shouldnt be a problem with unleaded

Jun 29, 2015 | 10:28 AM

#10

MDchanic

Connoisseur d'Junque

Joined: Sep 2010

Posts: 21,183

From: The Hudson Valley

I use no additive now.

Before I polished the combustion chambers I used Octane Supreme (tetraethyl lead / TEL) to increase the octane, but don't need it now.

- Eric