Saturday, July 12, 2014

If "America Runs on Dunkin" what do Monza's run on???

I'm not sure about your's... or even if you have "Name Brand" gas in your area..   But My Monza RUN'S on Sunoco.


Dunkin Donuts CouponsI do personally run on Dunkin Donut's coffee.  I have a nearby location that serves a very consistent "magic cup" of coffee.  Perfect for most workdays when I need to switch into 'run' mode.

Sunoco Fuel.  A+ Mini Mart's.  Food  Eating

What does my Monza run on...?   My Monza was tuned using Sunoco Ultra 93.  That mean's, that when I adjusted the idle mixture, and dialed in my distributor's timing curve, I was running Sunoco's Ultra 93. The highest octane "street fuel"  around.

I can get away with 91 octane "Premium" (found at most all other retailers stations)  However I have to listen for 'detonation' or 'pinging' as you might call it, during hard acceleration.

Any less and It'll definitely ping.    My initial mindset for tuning the engine to this fuel is as follows.. Most sources say for maximum power tune the engine timing for the most timing it will accept before it ping's and looses power.. (dangerous detonation).    And Ultra 93 allowed for the most timing I could dial into the motor. And as such it sure feels strong and crisp. Run's cool too.  In fact a little too cool most of the time, so the timing I have dialed in isn't contributing to any type of run-hot condition, barring running the car at 4000 RPM for 30+ minutes in the mid-day sun, heat and humidity... but I don't find myself stunt-driving like that anymore anyways.

The 2nd reason for tuning for Ultra 93..was the need to use a fuel with greater knock resistance, as is the case with Higher Octane fuels.    Why?   My Monza still has the factory 305.
 In Stock form, the 305 used dished pistons and a pretty basic and low; 8.4:1 compression ratio.
Even still it used tiny 57cc chambered heads, and was designed to run HOT for emissions purposes.
With tiny valves and propensity to build up carbon in the chamber detonation was a concern for early lean-running, emission-tuned 305's.

 My Monza however, has been updated to heads from an '83/'84 305HO motor. Larger valves and a little better flow are the advantages of using these heads. The also have a slightly larger 60cc chamber, and are made to run with a flat top piston..   And lucky for me.. mine has been dis-assembled and bored .30 over and refitted with Flat-top's, with 4 valve relief's. Good again for compression.. @ 9.5:1 with a reg head gasket.
Good therefore, for performance, but these were still made for an emissions tuned hot running motor. So with detonation still in mind, I opted to tune to Sunoco Ultra 93.

Plus lucky for Sunoco they are the closest fuel retailer to my garage bay.  Their sticker's also made a great cover for some recent blemishes that found their way onto my daily driver - Chevy Aveo.

I have read in recent years, about power tuning a normally aspirated engine for 87 octane and making excellent street power, but that was on an 8.4:1 350 engine.





Saturday, July 5, 2014

Monza meet's GoPro Hero3 Action Cam




Just me testing my Gopro hero3 'white' with a suction cup mount and an external microphone.
The microphone is just an old computer mic...(on a budget).  Just got the USB to Mic adapter cable today and wanted to test it all out.  (Drove from Rochester to Buffalo to get it).

 I used a dremel tool and ground out the waterproof housing to accept the Usb adapter cable. Worked well. 

Sounds like the mic is a little sensitive to wind noise..I'm going to have to make a small noise canceler out of a piece of foam.  
The suction cup mount is one I used from an old GPS unit I have.  It seems to hold on even outside the car as long as the surfaces are polished clean and tiny bit of water is used.

Video's shot at 1080p @30fps.
Camera controlled using GoPro app

If it appears that the steering wheel is bent your right. That's how it was made to compensate for a slightly off center steering column.  So it sits straight at the driver when it's in the straight-ahead position.  

Driving the car you never know it's like that. it's only from this camera angle that it's noticeable