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Pontiac General Discussion/Questions

Discuss or ask questions on any Maintenance, Modifications and Garage topics that don't fall into any category.

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July Pontiac of the Month
1. Keane165's 1970 Lemans

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1969 firebird convertable

my 1969 FIrebird convertable i need the left and right stainless steel retianer moulding they are not rerproduced so calling all pontiac firebird part people he retiansers hold the rubber gaskets in place in the front part of the A pillar windsheild post

By willies 69 Bird · 2 hours ago2 hr
Octane! Are all things equal? Does it matter?

Well, I'm a believer, I honestly would've never thought octane could affect an engine the way it did mine. As much time as I spent, as much help as y'all gave me, and not being able to stop the dieseling. I mean y'all seen the videos, I've driven her a number of times since and no dieseling. I even went and put 10 gallons of 87 octane a couple weeks ago to satisfy stupid curiously and when I shut her off, she DID diesel. Dumped in a bottle of booster and justa like before, no dieseling. It's still mind blowing to me.
I remember that episode!

By Wrongway · 4 hours ago4 hr
Octane! Are all things equal? Does it matter?

When you buy a grade of fuel in the same brand in the same country you get more of a % of the octane additive as you go up in grade! That’s it, nothing complex, JustA more! But, what formula it is does make a difference & what system the formula was tested on makes a difference! Hands down the best formula of the 18 formulas is 2,2,4 trimethylhepane. This has been proven through the testing of both the RON & MON.
So let’s take the RON test system. This is the most used worldwide for the consumer at the pump. So Europe, England, Australia, etc, but not the USA.
The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine at 600 rpm with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.[8] The compression ratio is varied during the test to challenge the fuel's anti-knocking tendency, as an increase in the compression ratio will increase the chances of knocking.
But, the MON test system uses a different methodology. The Motor Octane Number (MON), is determined at 900 rpm engine speed instead of the 600 rpm for RON. MON testing uses a similar test engine to that used in RON testing, but with a preheated fuel mixture, higher engine speed, and variable ignition timing to further stress the fuel's knock resistance. Depending on the composition of the fuel, the MON of a modern pump gasoline will be about 8 to 12 lower than the RON.
What does this really mean? Well, recently there was a post stating the use of a minimum of 95 octane & when possible 98 octane! Yet the misconception, AKA perception, that it was relevant to the USA octane! It is not! Those numbers are of the RON standard. Which places them at a minimum of 6 octane numbers lower than they are when compared to the USA! Meaning they would actually be no more than an 89 & 92 octane, but possibly lower depending on other factors. Those other factors are fuel brand, which means there could be a different octane formula other than the 2,2,4 trimethylheptane. Which can further lower the octane rating. The USA uses the AKI rating for octane! It stands for anti knock index. This rating basically uses the RON & MON combination with a mathematical formula! So in general USA octane rating lie in about the middle of the two. Thus about 6 octane numbers lower than the RON octane numbers!
You didn’t really think that the station down the street that sells the same octane rated gas was giving you the same gas did you? Those brands are using less costly octane formulations, less detergents & in many cases not much else!

By Last Indian · 7 hours ago7 hr
Octane! Are all things equal? Does it matter?

Farmtruck and Azian went to a shop to have NOS tanks filled and had to buy fuel in drums to race the truck.

By JUSTA6 · 9 hours ago9 hr
Wanted to buy

Are you looking just for a ring and pinion gear set, the whole center section or the whole diff?

By Frosty · 11 hours ago11 hr

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