My Z arrived today!

[rspallina]

I would if I knew where to get it!  That's funny!

[BULLITT65]

They have 93 in Indiana, it and mine seems to run just fine on that. I am sure popping up to 100 would be alright as well.

If I was looking at the gas pump above I would go 3/4 or so 91, and then 100 the rest of the way to get around a 94/95 adjusted octane.

[rspallina]

what about the ethanol issue?  Anybody have concerns?

[1968RSZ28]

I would if I knew where to get it!  That's funny!

Redwood City, CA
"Climate Best by Government Test"



 

Paul

[BULLITT65]

That sign is still there today....although I wasn't aware of that 76 station in redwood city.

[ko-lek-tor]

what about the ethanol issue?  Anybody have concerns?

By all means, absolutely Never, NEVER, if you can help it, run ethanol! One more NEVER!

[69ZX77MP]

I have a stock 69z rebuilt to factory specs, I run Sunoco 112 with 93 I use a 50/50 mixture the mouse likes the added octane no pinging or hesitation and it also runs cool at 180degrees. Something to think about, congrats with your new ride and good luck

[JohnZ]

A stock Z built to factory specs will run fine all day long on pump 93 octane with no additives of any kind, if it's tuned properly. Have no experience with 91 octane. We've had ethanol ("gasohol") in this area for 30 years - just makes it more sensitive to fuel percolation in the float bowls in hot weather.

[1968RSZ28]

That sign is still there today...

Yup, here it is today...



Paul

[rspallina]

thanks guys...beautiful shot of Cali!  I searched hi and lo around my area and not a lot of places with race gas.  A few non-ethanol places so I will stick with it.  Right now I've got 18 gallons of fuel that is probably about a 92 with mostly non-ethanol.  Will see how she runs and let you know.  Read the thread on additives and not crazy about what i'm reading.  Prior owner swears by it but not sure i should be using.

[jdv69z]

A stock Z built to factory specs will run fine all day long on pump 93 octane with no additives of any kind, if it's tuned properly. Have no experience with 91 octane. We've had ethanol ("gasohol") in this area for 30 years - just makes it more sensitive to fuel percolation in the float bowls in hot weather.

This has been my experience as well. I've had no issues with 93 octane to date.

[X33RS]

Ditto.  These engines get away with it thanks to the camshaft bleeding off a fair amount of low speed cylinder pressure.  .050 duration numbers are healthy and the LSA is spread out pretty far on the stock cam.

However the tune has to be spot on with proper AFR's and I like to keep timing at no more than 36 total with a "not to aggressive" curve.  On top of that I like to keep engine temps as low as feesable.  When on the edge ambient temps can start playing a roll.

My only complaint is these cars not having a return style fuel system.  Couple that with ethanol blend fuels that are more prone to vapor lock, and you can sometimes have a car that doesn't like the heat of the day.   The higher octane helps here, but there are other tricks I do to fight this scenario if it becomes a problem.

[Kelley W King]

My L78 and my Z run on 93. But here in NC you can buy race fuel for $7.00 a gallon. I usually add about 2.5 gallons of race fuel to a tank of 93. This makes them run much better. But don,t run it in the shop long unless you don,t like your eyes. Here the fuel is not everywhere but usually at a station near a race track.

[rspallina]

Guys - I (actually Darell lol) found the casting date for the axle...it was actually on the opposite side (passenger side not driver side) from the pics that are shown on the rear axle page with all the decoding information for the 67-69 rear ends. Darell and I looked extensively for the casting number in all the places it should have been on the driver side. This is a 341 casting number car so I am wondering if it is in a different place than the picture that is shown on the page for the 860 casting number.  Perhaps they did something different for the late 69 builds like they did for the casting date?  Does anyone know where to find it?  I updated the axle information thread with the casting date.

[69 Zee]

Your axle cast date is  I 2 9  (Sept 2 '69) BTW !!