| DRMINI |
| Total Posts: | 6468 |
| Last Post: | 07-23-08 |
| User Since: | 10-27-00 |
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Posted: Apr-29-2008 05:38PM
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I run a 12G940 head on my 1360 with 1.219" exhausts, as Nick says there's no room for inserts.
Here in Oz I add Flashlube to 98RON unleaded, and it's not expensive. 1L does 1000L of fuel.
This means it's adding 1.6c/L to the fuel cost, peanuts really.
I know it works- I once ran a reconditioned head on a 1098 for 6 months to see what happens without it, and the hot valves pulled little bits of iron out of the head.. the dreaded valve seat recession.
Kevin G
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Posted: Apr-29-2008 03:26PM
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I would be reluctant to fit hardened seats into a AEG163 head which the 66 Cooper S has. The head is prone to cracking in normal use and the valves almost touch as it is. Inserting seats would surely ruin it. Trust me, I've had it happen. Use a suitable additive. Also compression is not excessive at 9.75 so octane booster may not be necessary.
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| mascherk |
| Total Posts: | 634 |
| Last Post: | 07-23-08 |
| User Since: | 08-08-02 |
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Posted: Apr-29-2008 09:21AM
 Edited: Apr-29-2008 09:22AM
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Keep in mind that lead substitute doesn't necessarily affect the octane of the fuel. That's what octane boosters are supposed to do. Lead subsitute helps to fight valve seat recession while octane boosters should help fight detonation or pre-ignition.
Most of the things that can happen or are done to an old engine raise the compression ratio and therefore require higher octane fuel.
Cheers,
Kelley "If you can afford the car, you can afford the manual..."
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| btsave |
| Total Posts: | 535 |
| Last Post: | 07-23-08 |
| User Since: | 04-21-02 |
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Posted: Apr-29-2008 08:09AM
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I question the cost efficiency of using a lead additive. If you look at the cost of repeatedly using a lead additive over 4 or 5 years, vs. not using the additive, you would potentially have saved enough money to put in a hardened head with the savings over the years! Just my thought on this... I guess it would depend on how much one drives though.... I have noticed no drivabilty difference between usung the additive vs. not... but I could be just the odd one here. I do agree go for the highest octane though. "huh? did i really just say that out loud?"
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| Cup Cake |
| Total Posts: | 5212 |
| Last Post: | 07-23-08 |
| User Since: | 05-13-01 |
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Posted: Apr-29-2008 07:22AM
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US and Canada uses an average of M and R ((M+R)/2)
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| 1963S |
| Total Posts: | 384 |
| Last Post: | 07-24-08 |
| User Since: | 09-21-06 |
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Posted: Apr-29-2008 03:47AM
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Your S - in its original state - was set up to usee 100 octane leaded Although it could survive on a bit less. Don't forget this is MON ..or is it RON. Whatever, its the opposite of what you have in the US. US octane ratings are about 3 to 5 points higher than the UK rating (89US = 92ish UK)...sort of.....
However, a lot of things may have happened during its lifetime so its difficult to say what it needs now.
The octane requirement relates directly to your compression ratio.
If you don't have hardened seats then you need a lead substitute or additive. Here in Oz, " Valvemaster" has worked quite well in my S engine.
Cheers, Ian
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| helpmymini |
| Total Posts: | 2481 |
| Last Post: | 07-23-08 |
| User Since: | 04-26-05 |
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Posted: Apr-29-2008 01:11AM
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I use premium gas with a lead sub. I use it every tank. My engine is a stock 1275 Cooper S motor with 65k on it. I figure I'm just living the twilight of it's life, so I treat it good, (as far as fuel goes). I use Castrol 20/50 oil, and alot of it. What it doesn't burn it leaks.
Mark Looman, Ada Michigan
1967 Austin Cooper S
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Posted: Apr-28-2008 07:58PM
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One of my local Sinclair stations carries 88 octane fuel with "Valvemaster 2000" additive already mixed in. I'm in a heavy agriculture area if that has anything to do with it. The price per gallon is the same as straight unleaded fuel on the next pump over. So adding a bottled octane boost to the "V-master 2000" fuel would be better than adding bottled "instead o' lead" to premium 94 octane fuel?
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| Dean2 |
| Total Posts: | 2231 |
| Last Post: | 07-23-08 |
| User Since: | 12-07-00 |
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Posted: Apr-28-2008 06:40PM
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Try running it on 87. If it doesn't ping then use that. If it pings, try 89, etc. Due to my compression ratio, I have to run 93. I paid $4.19/gallon today!!! There's no sense paying the extra $.40 or so a gallon if it's not necessary. Thanks to the Interstate Highway System, it is now possible to travel from coast to coast without seeing anything.
Charles Kuralt Autox/Rallyx Videos
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| Latka |
| Total Posts: | 6554 |
| Last Post: | 07-16-08 |
| User Since: | 12-03-99 |
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Posted: Apr-28-2008 05:03PM
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I don't think anyone said they're using leaded fuel. Folks are using a lead substitue that you can buy at your local auto parts store. I had one that I threw in the boot of my '71 and drove around with. Every fill-up I'd squeeze the prescribed amount into the little cup on the top of the bottle and dump 'er in. Easy peasy.
----------------------------------------------
My Higher Authority is the German Purity Law of 1516 .
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| speedpilot |
| Total Posts: | 204 |
| Last Post: | 07-23-08 |
| User Since: | 02-14-08 |
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Posted: Apr-28-2008 04:46PM
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Hold on a second. Where are you finding leaded fuel? If I had the choice I would probably run regular leaded fuel and use a good octane booster instead of running unleaded premium and lead substitute. That is what I was doing before they phased out lead fuel..
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Posted: Apr-28-2008 03:43PM
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Sounds like premium gas with lead substitute added is preferred over regular "leaded" 88 octane with octane booster added. I can do that. Thanks everyone!
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| JSG |
| Total Posts: | 244 |
| Last Post: | 06-25-08 |
| User Since: | 06-03-99 |
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Posted: Apr-28-2008 03:01PM
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'65 Cooper S here, Pretty much a daily driver, stock motor, premium gas with just a little lead substitute every other tank.
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| speedpilot |
| Total Posts: | 204 |
| Last Post: | 07-23-08 |
| User Since: | 02-14-08 |
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Posted: Apr-28-2008 02:17PM
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I think I would be using the highest octane fuel you can find which is probably 91 or 92 with the premium gas. Again use lead substitute unless you know that the head has hardened seats.
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| Headstay |
| Total Posts: | 9147 |
| Last Post: | 07-03-08 |
| User Since: | 04-13-02 |
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Posted: Apr-28-2008 01:21PM
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Octane required depends upon your compression ratio. Lead addiditive with old, non-hardened seats. Sail & Drive Fast! Live Slow! Billy Backstay 
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| maddog |
| Total Posts: | 954 |
| Last Post: | 07-23-08 |
| User Since: | 09-02-99 |
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Posted: Apr-28-2008 01:01PM
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I have a 67 Cooper S engine in my Mini. When I rebuilt the engine I had the machine shop install hardened seats in the head so I could run unleaded fuel. I use 93 octane. No lead substitutes, no octane booster. If you fill out your profile you'll get others to reply. Mad Dog www.miniownersoftexas.org 
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Posted: Apr-28-2008 11:33AM
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I realize this may have been discussed many times before-but I'm new and the search results don't bring it up so..... I've inherited my dad's 66 Austin Cooper-S (1275). I can get 88 octane fuel at the pump with a lead substitute (valvemaster 2000 I think). I add an octane booster to this. Does this sound like the best fuel combo for day to day driving? What does anyone else with this type of engine use?
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