Go Back   The Supercar Registry > General Discussion > Lounge


Reply
 
Thread Tools Display Modes
  #1  
Old 07-27-2017, 12:01 AM
Mr. Chevy's Avatar
Mr. Chevy Mr. Chevy is offline
Yenko Contributing Member
 
Join Date: Feb 2007
Location: Northern Ohio
Posts: 4,615
Thanks: 287
Thanked 704 Times in 347 Posts
Default Octane help

Has anyone had any luck with an octane booster? I don't want to throw away money on crap that does does not work. This is in lieu of actually running 110 race fuel which I know will cure the pinging issue in the motor.

I'm having issues with running Sunoco or Marathon 93 pump gas in my 67 Impala 327 motor. The motor is a bone stock 275 horse. The compression is 10:01. I have done everything I could to get it to stop pinging with running pump gas: retarded timing back, carbon cleaning, new ignition parts and the exhaust is flowing good motor is breathing.

Any help would be appreciated....

Thanks...

Rich
__________________
"This is Sheriff Buford T. Justice, I'm in pursuit of a black Trans Am, he is all mine so stay out of the way"
Reply With Quote
Click here to view all the pictures posted in this thread...
  #2  
Old 07-27-2017, 12:22 AM
VintageMusclecar's Avatar
VintageMusclecar VintageMusclecar is offline
Senior Member
 
Join Date: Jul 2003
Posts: 3,366
Thanks: 158
Thanked 161 Times in 46 Posts
Default

I haven't used this myself (yet!), but it has very good reviews, is readily available and it's affordable:



https://www.summitracing.com/parts/m...se2-_-race-gas
Reply With Quote
  #3  
Old 07-27-2017, 12:30 AM
bigjake's Avatar
bigjake bigjake is offline
Senior Member
 
Join Date: Aug 2009
Location: Sandwich,Ill
Posts: 153
Thanks: 146
Thanked 31 Times in 14 Posts
Default Octane Boost

Make Your Own Octane Boost



How to make your own octane booster (this is the basic formula of one of the popular octane booster products). To make eight 16 oz. bottles (128 oz = 1 gal):



100 oz of toulene for octane boost

25 oz mineral spirits (cleaning agent)

3 oz of transmission fluid (lubricating agent)



This product is advertised as "octane booster with cleaning agent and lubricating agent!" Diesel fuel or kerosene can be substituted for mineral spirits and light turbine oil can be substituted for transmission fluid. Color can be added with petroleum dyes.
Reply With Quote
The Following User Says Thank You to bigjake For This Useful Post:
JBX22 (07-27-2017)
  #4  
Old 07-27-2017, 12:36 AM
Mr. Chevy's Avatar
Mr. Chevy Mr. Chevy is offline
Yenko Contributing Member
 
Join Date: Feb 2007
Location: Northern Ohio
Posts: 4,615
Thanks: 287
Thanked 704 Times in 347 Posts
Default

Thanks Fellas...

Rich
__________________
"This is Sheriff Buford T. Justice, I'm in pursuit of a black Trans Am, he is all mine so stay out of the way"
Reply With Quote
  #5  
Old 07-27-2017, 03:06 AM
L89DRMR L89DRMR is online now
Yenko Contributing Member
 
Join Date: Jan 2002
Location: Litchfield,CT 06759
Posts: 182
Thanks: 10
Thanked 11 Times in 8 Posts
Default Pinging

Hi,

I had a 1969 Z-28 which pinged no matter what I did until I replaced the distributor advance weight springs with ones that offered more resistance.

One of those little things that can sometimes be overlooked.

Dave
Reply With Quote
  #6  
Old 07-27-2017, 04:24 AM
CanCOPO CanCOPO is offline
Yenko Contributing Member
 
Join Date: Sep 2010
Location: Texas
Posts: 221
Thanks: 614
Thanked 153 Times in 46 Posts
Default

I buy tetraethyl lead from Wild Bills Corvette. It's called Octane Supreme. I have had good results
__________________
1969 Hugger Orange RS COPO (Sold)
1969 Garnet Red Z28
1969 Super Bee (Sold)
1965 Pontiac Lemans
Reply With Quote
  #7  
Old 07-27-2017, 03:59 PM
TimG TimG is offline
Yenko Contributing Member
 
Join Date: Sep 2001
Location: Austin, TX
Posts: 4,120
Thanks: 1
Thanked 1,835 Times in 746 Posts
Default

I've had good results with the Podel and Wild Bill lead additive, but only in 11 to 1 small blocks. High performance big blocks (L78, L71, and L72) only respond to race gas or aviation fuel. All my old cars now run on 100% aviation fuel since we can't get non-ethanol fuel in Central Texas. I keep all of my tanks full of aviation fuel and no pinging and no hard starting any more.
Reply With Quote
  #8  
Old 07-27-2017, 04:34 PM
Canuck's Avatar
Canuck Canuck is offline
Yenko Contributing Member
 
Join Date: Jun 2005
Location: Vancouver BC
Posts: 1,866
Thanks: 215
Thanked 650 Times in 215 Posts
Default

Get Aviation fuel, its not hard to get, all small airports and flying clubs have it. I just bought 10 gallons and it was only 10% more than the best pump gas around here.
__________________
1971 W30 convert, triple green,second owner.
1971 W30 Convert, special order Rally red, under resto.
68 Charger R/T, Bullitt Replica
68 Camaro Z28,Corvette Bronze,Houndstooth
www.vancouverclassiccars.com
Reply With Quote
  #9  
Old 07-27-2017, 05:47 PM
Lee Stewart's Avatar
Lee Stewart Lee Stewart is offline
Senior Member
 
Join Date: Mar 2017
Location: ABQ, New Mexico
Posts: 36,633
Thanks: 3,506
Thanked 136,486 Times in 22,778 Posts
Default

Quote:
Originally Posted by Canuck View Post
Get Aviation fuel, its not hard to get, all small airports and flying clubs have it. I just bought 10 gallons and it was only 10% more than the best pump gas around here.
"AvGas LL100 stands for "Low Lead 100 Octane". TEL (Tetra-ethyl-lead) is added to raise the octane. When used in a motor vehicle this fuel will leave a lot of lead deposits in the motor. 100LL has a high lead content (0.5 grams per litre), even higher than leaded race fuels. The deposits left when TEL (lead) is burned are corrosive and damaging to valves, valve guides, valve seats and cylinder heads."
Reply With Quote
  #10  
Old 07-27-2017, 05:56 PM
novadude novadude is offline
Senior Member
 
Join Date: Aug 2006
Location: PA
Posts: 739
Thanks: 3
Thanked 49 Times in 35 Posts
Default

Quote:
Originally Posted by Mr. Chevy View Post
Has anyone had any luck with an octane booster? I don't want to throw away money on crap that does does not work. This is in lieu of actually running 110 race fuel which I know will cure the pinging issue in the motor.

I'm having issues with running Sunoco or Marathon 93 pump gas in my 67 Impala 327 motor. The motor is a bone stock 275 horse. The compression is 10:01. I have done everything I could to get it to stop pinging with running pump gas: retarded timing back, carbon cleaning, new ignition parts and the exhaust is flowing good motor is breathing.

Any help would be appreciated....

Thanks...

Rich
Unless the decks have been cut, etc. a factory 275 hp 327 actually calculates to something less than the advertised 10:1. Probably more like 9.2:1 to 9.6:1

You say you've tried retarded timing - are you talking initial, or have you actually considered the whole curve? A vacuum advance with no limiter will pull in a LOT of timing. Same goes for centrifugal. It would also be a good idea to check out a/f ratio with a wideband sensor. It's pretty easy to make a Q-jet deliver the required mixture, if you know where you need to go with it.

My opinion (based on experience with 9.3:1-9.8:1 CR 327 & 350ci Chevy engines with mild cam timing) is that a well tuned 275 hp 327 should run OK on 93 octane if everything else is "right".
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT. The time now is 05:12 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.

O Garage vBulletin Plugins by Drive Thru Online, Inc.