![]() |
|
![]() |
#1 |
Registered User
Join Date: Jul 2010
Location: Austin, TX
Posts: 29
|
fuel octane/additives
I wanted to post a general question about fuel, oil and additives. I just spoke with a guy who restores these old trucks and he was telling me about ways to prolong the life of the engine:
1. He says to use mid-range octane. 2. Use a fuel additive. 3. Use an engine oil additive. (not stop-leak) He was saying that the fuel and oil made these days are not easy on these old engines and by adding these additives, it would help keep my truck running longer. I'd like to hear what everyone thinks about this issue. thanks!! |
![]() |
![]() |
![]() |
#2 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: fuel octane/additives
if your engine does not have hardened exhaust seats, then a lead substitute will help, but it'll take many many years to damage them if you skip the lead additive. Plus, in many areas, lead substitutes are very hard to find.
Mid range fuel... throwing money out the tail pipe if the engine doesn't need it. oil additive... new oils (including diesel oils) don't have the zink needed to keep old engines alive. ZDDP additive IS HIGHLY recomended. |
![]() |
![]() |
![]() |
#3 |
Account Suspended
Join Date: Jun 2000
Location: over yonder
Posts: 14,270
|
Re: fuel octane/additives
x2 on the ZDDP additive
|
![]() |
![]() |
![]() |
#4 |
Big Red - Now its a SWB!
Join Date: Jun 2009
Location: Oroville, Ca
Posts: 1,624
|
Re: fuel octane/additives
Octane booster have been shown to be highly ineffective at boosting octane, also most engines don't need higher octane anyways.
__________________
68 3/4 ton ![]() ![]() 41 3/4 ton ![]() 01 Tahoe LT 4WD (my daily driver)-Magnaflow Muffler, Rollin on 22's 02 Ford Mustang Convertable (Wife's Car)-Flowmaster 50, Clear corners, Intake, sittin on 18's |
![]() |
![]() |
![]() |
#5 |
Registered User
Join Date: Dec 2008
Location: Pleak, Texas
Posts: 420
|
Re: fuel octane/additives
About the oil additives...if one were to have his engine rebuilt, shouldn't the new bearings, pistons, lifters, etc. be made to run on today's oils? I'm sure they have some kind of coating on them that the ones from the 60's and 70's didn't right?
__________________
-1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS ![]() -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too) ![]() You've gotta be able to stop and steer before you can go fast! |
![]() |
![]() |
![]() |
#6 |
Account Suspended
Join Date: Jun 2000
Location: over yonder
Posts: 14,270
|
Re: fuel octane/additives
|
![]() |
![]() |
![]() |
#7 |
Registered User
Join Date: Dec 2008
Location: Pleak, Texas
Posts: 420
|
Re: fuel octane/additives
Darn. I'll just keep running Pennzoil until something goes out.
__________________
-1967 Chevrolet Fleetside LWB- 350 V8 w/thumpr cam, NV3500, 3.08 gears, A/C, PS ![]() -1983 Chevy Silverado C1500- 383 stroker, TH400 -1989 Chevy Silverado K1500 SWB- 5.3L swap, 700R4, 3.42 gears -And a '66 Ford Mustang- 200 I6, C4 trans, rust bucket "The only thing we have to fear is fear itself." -FDR (and maybe rust too) ![]() You've gotta be able to stop and steer before you can go fast! |
![]() |
![]() |
![]() |
#8 |
Registered User
Join Date: Jan 2008
Location: Tejas
Posts: 691
|
Re: fuel octane/additives
it's the flat tappet cam that isn't suited for modern oil
|
![]() |
![]() |
![]() |
#9 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: fuel octane/additives
If you convert to a roller cam, then you'll be covered.
|
![]() |
![]() |
![]() |
#10 |
Msgt USAF Ret
![]() ![]() Join Date: Jan 2005
Location: Kalamazoo, Michigan
Posts: 8,714
|
Re: fuel octane/additives
The only fuel additive I recommend is called Seafoam. I use it on FI engines and it's good for carbs too. I'm not convinced that the lack of ZDDP is harmful to the older engines except maybe the flat tappet cams on breakin. I say that because chevy engines have been flat lobing these cams since the sixties. YMMV.
I don't want to omit using gas line anti-freeze for water in the fuel but that's not really a fuel additive.
__________________
VetteVet metallic green 67 stepside 74 corvette convertible 1965 Harley sportster 1995 Harley wide glide Growing old is hell, but it beats the alternative. |
![]() |
![]() |
![]() |
#11 |
Registered User
![]() Join Date: Feb 2010
Location: Santa Clara Utah
Posts: 85
|
Re: fuel octane/additives
x2 on the seafoam. Great stuff.
__________________
1972 K10 4wd Swb 350, 4 speed, 205 t-case Sold 1971 Cheyenne 2wd Lwb 350 4 speed Sold 1972 K5 blazer 4WD auto A/C |
![]() |
![]() |
![]() |
#12 |
Registered User
Join Date: Nov 2006
Location: Pomona Park, FL
Posts: 151
|
Re: fuel octane/additives
x3 on the Seafoam. It also has the lubricity needed to completely eliminate the need for lead additive. It also is guaranteed to stabilize your fuel for two years. It also will do the job of the gas line anti freeze, and if you rub it on your scalp hair grows back! Ok but all the rest is true..
__________________
1967 GMC 3/4 ton Fleetside 350 ci Chevy I'd rather do it myself and spend the extra 500 dollars Last edited by sleepingbag; 12-03-2010 at 03:37 PM. Reason: oh yeah |
![]() |
![]() |
![]() |
#13 |
Registered User
Join Date: Aug 2007
Location: West Hills, California
Posts: 679
|
Re: fuel octane/additives
Did anyone notice after adding Seafoam a little smoke out of exhaust?
|
![]() |
![]() |
![]() |
#14 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
|
Re: fuel octane/additives
the zddp thing is real. Engines have been eating cams for a long time, but now they do it MUCH faster.
|
![]() |
![]() |
![]() |
#15 |
Senior Member
![]() Join Date: Feb 2001
Location: New Madison, Ohio
Posts: 21,365
|
Re: fuel octane/additives
http://lubriplate.com/webstore/default.aspx
This is the motor oil that I use. GPO 15W-40 Zinc and Phosphorus Enhanced ZDDP Formula Ideal for High-Performance and Classic Car Engines
__________________
A husband can be right...or...A husband can be happy. ![]() 67-72 Chevy and GMC Trucks...The Classic Truck for the Classic Folk. ![]() 1970 CST Two tone green, 402BB, 400 Automatic, Tach, Buckets, AC, AM-FM, Tilt, GM CB, GM 8 Tract, LWB, etc ![]() ![]() JOHN 17:3...The better side of "LIFE" Remember: Everyday is a good day...Some are just gooder! Last edited by 70cst; 12-04-2010 at 01:07 AM. |
![]() |
![]() |
![]() |
#16 |
Registered User
![]() Join Date: Feb 2010
Location: Santa Clara Utah
Posts: 85
|
Re: fuel octane/additives
Seafoam does make more smoke because of the crud it cleans out. I had a jeep cherokee with a lot of miles that ran rough when I purchased it. I dumped some in the tank and sprayed the aerosol down the throat and it looked like it was on fire. I've used it on all my vehicles now.
__________________
1972 K10 4wd Swb 350, 4 speed, 205 t-case Sold 1971 Cheyenne 2wd Lwb 350 4 speed Sold 1972 K5 blazer 4WD auto A/C |
![]() |
![]() |
![]() |
#17 |
Registered User
![]() Join Date: Oct 2016
Location: Redwood City CA
Posts: 566
|
Re: fuel octane/additives
Thought I would revive this thread to see if anything has changed in the last few years. Seems like the consensus is that fuel/oil additives are not worth it. My truck has x96K miles on what appears to be the original engine. If it has been rebuilt, then I'm good. If not, a rebuild is in my near future anyway.
__________________
72 White Cheyenne, The Ghost |
![]() |
![]() |
![]() |
#18 |
Registered User
Join Date: Mar 2013
Location: Campbellsville, KY
Posts: 888
|
Re: fuel octane/additives
I've seen a number of flat-tappet engines run many miles (not just toys/cruisers - everyday working rigs) without ZDDP additive with no excessive cam wear or failure - a good oil changed at adequate intervals should protect the stock, low-lift cams in our trucks after break-in, but a ZDDP additive or oil that's already higher in Zinc (some dual-rated gas/diesel oils or special hot rod/classic oils) won't hurt. Seafoam is a good periodic additive, but I don't use any additives full-time and run 89. Our truck's stock engines are nearly all low enough compression that knock resistance isn't much of an issue, but I've just had too many occasions when new and old vehicles ran better on plus than regular it's now habit to punch the middle button on the pump. Burns cleaner, runs cooler, etc.
__________________
Alex V. ------ 1967 C10 Suburban, 350/NP435, Green/Green, PS, PB, HD cooling, charging, shocks, and springs. 1985 GMC C3500 SRW, Sierra Classic, 454/TH400, white/blue. |
![]() |
![]() |
![]() |
#19 |
Registered User
Join Date: Nov 2009
Location: Michigan
Posts: 474
|
Re: fuel octane/additives
What is ZDDP?
Zinc dialkyldithiophosphate (ZDDP) is the most commonly used anti-wear additive in motor oils. It contains both zinc and phosphorus components that work together to provide anti-wear protection and minimize lubricant breakdown. ZDDP also exhibits mild extreme-pressure protection. Some motorists think that increased zinc content equals increased wear protection. Although somewhat true, the statement can be misleading. First, the mere presence of zinc doesn’t mean it is in the form of ZDDP. In other forms, zinc offers additional oxidation protection but little wear protection. Second, other factors influence the oil’s ability to control wear, such as its viscometrics and base stocks. While zinc is important in protecting against wear, the greatest concern should be in using a well-balanced oil that is designed for its intended application. How ZDDP Works As temperatures rise and surfaces come closer together, ZDDP decomposes, and the resulting chemistry protects critical metal surfaces. When parts move during operation, any sliding or rolling motion takes place on top of or within the ZDDP anti-wear film, which reduces metal-to-metal contact. This is especially important in modified engines with flat-tappet camshafts because the engine is creating more horsepower than it was designed for, which puts more stress on the engine. High-tension valve springs, often used in racing applications, also increase the potential for cam wear and require additional ZDDP. Negative Effects of ZDDP ZDDPSince all engines benefit from oils with superior anti-wear properties, it seems obvious to formulate all motor oils with high levels of ZDDP. Generally, high levels of ZDDP result in volatile phosphorus being transferred from the combustion chamber to the catalytic converter. Phosphorus can blind over the catalytic reaction sites in the converter, making it less efficient in turning carbon monoxide (CO) into carbon dioxide (CO2). The EPA mandates that catalytic converters operate as designed for more than 100,000 miles. As a result, phosphorus is limited for newer motor oil specifications. When the American Petroleum Institute (API) and the International Lubricants Standardization and Approval Committee (ILSAC) established phosphorus limits at 0.10 percent weight in 1996, motorists and enthusiasts wondered if it would negatively affect wear protection. The move to reduce phosphorus may not have taken into consideration high-performance and modified engines or engines that had yet to be broken in. The debate intensified in 2004 when the API and ILSAC further limited phosphorus to 0.08 percent, where it remains today. When it comes to older engines – particularly those equipped with flat-tappet cams – and engines modified for increased performance, the challenges to delivering adequate wear protection become more pronounced. Flat-Tappet Cams The design of flat-tappet cams makes them especially vulnerable to wear. As the name indicates, the tappet – or lifter – is flat. During operation the surface of the cam lobe slides rapidly over the surface of the tappet, producing high friction and temperatures. The camshaft and lifters are responsible for triggering the precisely tuned movements of the valvetrain Without the protective film barrier provided by ZDDP, the cams and lifters wear from the force of operation, negatively affecting cam and valve operation. Because most V-8 engines of the muscle car era came standard with flat-tappet cams, the problem is especially prevalent to classic-car and hot-rod owners.
__________________
Brad handshoe |
![]() |
![]() |
![]() |
#20 |
Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
|
Re: fuel octane/additives
there's an EXXON station nearby that sells non-ethanol 90 octane and both of my old trucks seem to start/idle/run good on it. About $3 a Gal.. WaWa sells 89 octane a little cheaper and neither truck likes it as well. I loose about 100 rpm off the idle speed. Both trucks are low compression and I can advance the timing til they run crappy and won't turn on the starter and they still won't spark knock.
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
![]() |
![]() |
![]() |
#21 |
Registered User
![]() Join Date: Jul 2015
Location: 2nd left past the stump on a dirt road.
Posts: 2,629
|
Re: fuel octane/additives
For the tech savvy: Gas treatment
Aqueous monoethanolamine (MEA), diglycolamine (DGA), diethanolamine (DEA), diisopropanolamine (DIPA) and methyldiethanolamine (MDEA) are widely used industrially for removing carbon dioxide (CO2) and hydrogen sulfide (H2S) from natural gas and refinery process streams. They may also be used to remove CO2 from combustion gases and flue gases and may have potential for abatement of greenhouse gases. Related processes are known as sweetening.[15] |
![]() |
![]() |
![]() |
#22 |
Registered User
Join Date: Jul 2009
Location: Space Coast, Fl.
Posts: 1,050
|
Re: fuel octane/additives
gas treatment for the non-tech savy.... Related processes are known as sweetening
![]()
__________________
Dad always said, "Son, WISH IN ONE HAND, and ......." -------------------------------------- -------------------------------------- Current toy trucks: '71 GMC 1500 SUPER CUSTOM short/step, orig. dk. blue, 350/700r, ps,pb, A/C '72 Blazer 2wd, ochre & white, 454, tremecTKO 500 5spd. ps, pb, A/C, tilt Last 10yrs of hobby vehicles, had a FEW more in the 50yrs. before these: '66 Plymouth Belvedere City of Miami cop car clone. '70 Nova 406"sb, 13.5-1, solid roller, Brodix, p.glide/t.brake, back halved, 9" Ford, spool 4.88, cage,ladder bar/coilover, 10.5 tire....... SOLD!! '67 C10 short/step side mount spare -- SOLD!! '72 Jimmy 2wd, 350/350, ps, pb, fun driver, lots of bondo & a shiny red paint job..... SOLD!! '69 Nova 350, 4spd, A/C, ps, p.b, ...SOLD!! |
![]() |
![]() |
![]() |
Bookmarks |
Tags |
additive, engine, octane;, oil |
|
|