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  • Users: Viper488
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  1. Viper488

    Tire diameter as part of overall gear ratio

    I know that tire diameter is part of various formulas like: MPH = RPM x Tire Diameter ------------------ gear ratio x 336 But just in case.. I wanted to ask if all other things being equal, does a ring & pinion ratio of say 3.45 with a talle(r) tire perform better in drag racing than a r&p...
  2. Viper488

    Post turbo exhaust tuning important?

    I've been searching the internet and can't any info on choosing pipe diameter, flow requirement calculations etc for a turbocharged car. Plenty of theory for n/a cars of course. People in the car forums I hang out in say it 'doesn't matter'. Could be I suppose. With the turbo blocking so much...
  3. Viper488

    Cleaning prisms in production application

    A relative of mine is involved with a company that has its' production employees use kleenex, toothpicks, and acetone to clean their prisms during the product assembly process. This seems terribly lo-tech, and is a major hold up in the overall production count per shift. The prisms are used in...
  4. Viper488

    AMODEL type A/B plastic for intake manifold?

    I'd like to re-do an after market blower intake manifold in some sort of plastic media that's comparable to AMODEL. Something that does not have to be injection molded. Available in Part A&B canned form, or that can at least be purchased in block form to allow me to have it machined to my...
  5. Viper488

    Low cost plastic molding?

    Are there new age molding techniques that a private party can use to get have something molded in low volume without having to use the expensive steel molds? I want to as cheaply as possible what is essentially a box that's flared a bit at the top using some sort of heat resistant plastic or...
  6. Viper488

    More blower psi vs same + ported heads

    Okay, here's an engine with hypereutectic AL pistons traditionally said to be limited to 5psi from a DIY blower kit using a Whipple blower. Setting that aside for the moment, but keeping that limitation in mind, what's the difference between adding ported heads to that 5 psi s/c engine, or...
  7. Viper488

    Side effects of adding phenolic spacers under intake

    On for example the Viper engine, if I were to add say 1/4" phenolic spacers under each runner to head port connection, how much higher would that raise the manifold? 1/4"? More/less? I'm also looking for advice of which particular type of phenolic plastic I should buy with a continuous useage...
  8. Viper488

    Plastic under carburetor for heat barrier

    What type is used most often in this type of application? I think it's a phenolic plastic, but I'm seeing there's many kinds. I want to make my own for an automotive application. Continuous use temperature would have to be high enough to endure average temperatures near an engine block...
  9. Viper488

    Relationship between altitude and max MPH

    I'd like to know how high you'd have to go for a 25% reduction in atmosphere, and how much faster (as a percentage is okay) a given aircraft might/could go (with the same power) at that altitude as a result of flying in air that's 25% less dense. Thanks!
  10. Viper488

    Recommended plastic for engine lifter valley heat barrier?

    My intake manifold sits above the lifter valley. I'd like to make a heat barier out of an affordable plastic to go under the raised intake runners and even up and along side the valve covers to really isolate the intake manifold from engine heat. I prefer a plastic over aluminum for...
  11. Viper488

    Results if I join Viper plenums..?

    I'd like some educated guesses about what would/might happen if the Viper's plenums were connected. There is a core plug at the back of each plenum. I could join them with some plumbing and have a solenoid actuated valve in the middle opened by a rpm switch at 4500rpm or so. This question...
  12. Viper488

    Should intercooler be painted/anodized for max heat transfer?

    Which would extract heat better, a grill mounted intercooler in natural aluminum finish, or one anodized black?
  13. Viper488

    Gear ratio vs powerband

    All Dodge Vipers come with a 3.07 rear axle. Few if any owners who've gone to 3.45,3.55, even 3.73 gears can positively say they've seen an improvement in ET at the strip. Yet the SOTP feel is tremendous(!), on the street anyway. How can such a marked increase in SOTP fail to yield concrete...
  14. Viper488

    Plenum size vs horsepower vs throttle response

    On a n/a fuel injected engine, are there any general rules for plenum size vs displacement? Some say the plenum should be at least equal displacement. Others say 2x displacement or more is better. I'm looking to optimize power between 4000-6200rpm. Any good rules concerning plenum size vs...

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