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  1. boatmotorgod

    Compression Ratio - Normal Aspirated Alcohol Injection

    I ran some numbers through an engine dyno program. At 12:1 you should see over 250 psi cranking, over 300 psi at 14:1. I would hate to see over 220 on race gas. I assumed 114 lobe centers, a factory cam could be as high as 118. I think its going to ping like crazy. You'll have to raise intake...
  2. boatmotorgod

    E85 Stoichiometric and o2 readings

    An o2 sensor compares the o2 content left in the tailpipe after combustion. The meter you are using is correlated to gasoline hence the air/fuel ratio it is reporting is higher than you expect. It is reporting a rich condition (very little o2) after combustion, so I would say you are OK. Though...
  3. boatmotorgod

    Marine Engine Block Freezing

    I agree with Fabrico, put a new plug in it and pressure test it. In my buisness I have seen quite a few Ford blocks push out the plugs without cracking the block. Though I can't recall a Chevy that survived without cracking. A core plug and pressure testing is far cheaper than a tear down for...
  4. boatmotorgod

    Questions on camshaft LSA and overlap

    I like to use the dyno-simulation program from Performance Trends.It has inputs for the exhaust system, header primary length and diameter intake length and diameter.you can either choose pre-entered cylinder head data,or use flow bench data to enter data about your own heads. Runing conditions...
  5. boatmotorgod

    Choosing camber curves

    racecar dataloging shows the inside suspension travels very little, while most of the travel is on the outside. I would figure 2-3" in compression depending on spring rate. To give a short car high speed stability I would use 6-8 degrees of camber. High amounts of KPI coupled with high amounts...
  6. boatmotorgod

    Anti-dive basics?!

    If the control arm chassis mounts are parallel from a side view then there is no anti-dive, stock or lowered. I believe anti-dive comes from a change in caster. If there would be a positive change in caster during braking, then a load would work against the direction of the brake rotor to hold...
  7. boatmotorgod

    Nitrous to increase turbo efficiency

    I believe the propane accelerates the burn rate as well as adding fuel to the fire. I have seen kits that only operate @ WOT & add 100 to 200 HP. Thats enough torque to twist the driveline off.
  8. boatmotorgod

    Differential Driven Turbine

    I remember a couple of articles on turbonique. Seems they campained a VW bug. I think they wrecked it, you know how VW's like to fly when they go to fast. I think there was a mustang too. The pictures I remember seeing were awe inspiring. The turbonique made serious power, and didn't weigh much...
  9. boatmotorgod

    Nitrous to increase turbo efficiency

    you are pushing 34# of boost and you are not interested in augmenting the power with a cooling medium? you are pushing that poor turbo way past its efficiency curve, and that IAT is dangerous for the engine. If you are really not interested in the power boost then turn the boost back down to a...
  10. boatmotorgod

    camshaft turbo and non turbo

    Marine engines need to make more power at higher rpms then std. engines. Boats have to turn more rpms to go faster and therefore see increased load with increased speed. When the bus gets up to speed you let up on the throttle and cruise. To opperate the engine at close to WOT all day long; the...
  11. boatmotorgod

    Air Inlet Sizing Question (Fluids Theory)

    desired RPM and cam timing has important influences on cylinder filling and the approach you take. At lower RPM's there is more time to fill the cylinder, so intake inertia coupled with the fact that the intake valve closes 35 or more degrees ABDC helps to fill the cylinder. At higher RPM's...

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