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  1. crerus75

    Valve spring pressure and boost

    Could this old wives' tale simply be a misinterpretation of observed phenomena? Perhaps something like this occurred: 1- Supercharger of some kind is bolted to an engine, perhaps one that already has marginal spring pressure for the conditions seen at redline 2- Engine pulls harder, as it is...
  2. crerus75

    EFI V8 retrofit into 70s TVR

    Best of luck to you. This sounds like a great project. Please post back periodically with questions and results.
  3. crerus75

    EFI V8 retrofit into 70s TVR

    SlowM, I apologize in advance for the brain dump. Post back if anything is unclear. The variable speed control certainly does affect fuel pressure. However, most aftermarket EFI and most older OEM systems are designed to work with a constant DIFFERENTIAL pressure through the injector. You...
  4. crerus75

    EFI V8 retrofit into 70s TVR

    JayMaechtlen, The returnless systems I've seen regulate the pressure with a small, non-vacuum-compensated regulator built into the pump module inside the fuel tank. The bleed-off fuel is recirculated back without ever leaving the tank. I'm not aware of any systems that regulate system pressure...
  5. crerus75

    EFI V8 retrofit into 70s TVR

    slowM, I skimmed your posts and have a few thoughts off the top of my head. I worked in the aftermarket industry as a fuel injection test technician and used to spec fuel systems, so I might be of help. The rule of thumb I always used was to utilize a 100-150 micron filter before the pump or...
  6. crerus75

    Solar Roadways

    Like most of the other technologies that are going to change the world, this one makes me skeptical. I don't know if these questions are stupid, so everyone please feel free to educate me. -Road grit is abrasive. How long will that surface stay transparent enough to produce usable power...
  7. crerus75

    expert street driving manual transmission

    Agree with NormPeterson and TheBlacksmith. When I was going to school for automotive repair, we had a drivetrain repair instructor tell us about this. He'd been a dealership mechanic and had gotten a car (Chevy Citation with a manual trans) to repair. Customer complaint was that it jumped out...
  8. crerus75

    flywheel bearing on an industrial / marine engine

    I have never heard this terminology before, and I also thought of pilot bearings when I first read this. The only alternative I can possibly think of is a clutch throw-out bearing, but they're usually activated either mechanically or hydraulically. I've never heard of a pneumatic throw-out...
  9. crerus75

    Generic question on longevity of modern automotive engines at high load

    It is said that a sidestep engages the clutch more quickly than conventionally releasing the clutch. Put another way, the clutch can engage faster than the driver's foot can come up, so sidestepping prevents the clutch pedal from "riding" the sole of the driver's foot on the way up. I've never...
  10. crerus75

    Generic question on longevity of modern automotive engines at high load

    dgallup, IIRC the 240 hp rating was for the later TPI engines. Early cars had less, and 84 was Crossfire-injected (two TBI units on a crossram manifold, RPO code L83). I think this gave way to an iron-headed TPI engine (RPO L98) in 85 and half of 86, and an aluminum-headed TPI from late 86 to...
  11. crerus75

    Flames and Popping sounds from exhaust of IC engines [reasons]

    As BrianPetersen says, you will see commonly see this on race vehicles. You can also do it on an old carbureted Ford Ranger if you hollow out the catalytic converter and keep the smog pump hooked up. Just mash the throttle for a second to make sure the engine sucks in a nice shot from the...
  12. crerus75

    Generic question on longevity of modern automotive engines at high load

    Some kind of flow restrictor is used in the hydraulic circuit of at least some automotive clutches. When I was an auto tech the guy in the next bay wound up putting an unsprung-hub, ceramic-metallic-puck racing clutch in an AWD Mitsubishi Eclipse as per the customer's request. Part of the job...
  13. crerus75

    Location of System Options Settings - Any Interest?

    Sounds very interesting. I'd like to see it.
  14. crerus75

    Another whats new is really old engine design

    Google "Cleeves cycle" and a few hits will pop up, including a picture of their prototype. The company has been featured in Popular Mechanics, and one article says they're developing the engine for an undisclosed Asian scooter manufacturer. We haven't heard much about this because the world...
  15. crerus75

    The materials less traveled

    I remember a show when I was younger called "Beyond Tomorrow." One of the episodes dealt in part with an engine that was made from ceramic. I distinctly recall the host lugging the engine block onto a table and then talking about it, but it was a long time ago and I don't remember much else...
  16. crerus75

    Frequent Spark Plug Failure in Waukesh L5790 Gas Engine

    What are the symptoms or characteristics of the failure? Is mechanical damage (IE cracked insulator) visible? I ask this because you mention the word "explosion" in your thread. Are there any deposits on the plug? If so, do they appear to be metallic? What fuel is being used (propane...
  17. crerus75

    Consensus Science

    If you're talking about Micro, he didn't really write it himself. He had some of it penned and a co-author finished it up. I didn't care for it either, but I think this had more to do with it being written piecemeal by two different people than by the basic premise (which had potential). If...
  18. crerus75

    Automotive Hone Machine

    Is low-tech ok, or do you want something that will output data to a PC? If the former, what about using a very inexpensive coaxial dial indicator like this one? http://www.shars.com/product_categories/view/5230201/CoAxial_Indicator_Sets
  19. crerus75

    Coating (painting) defects

    Oil can also come from several external sources-- anything from someone lubing air tools in the shop area and then running them to blow out the excess, to running a diesel engine nearby, to leaving fingerprints on a part. Silicone residue in many forms, from sealants to lubricants to things...
  20. crerus75

    How can I be taken seriously?

    Perhaps you need to approach this from the other end. Figure out what you require from your job (you mentioned 50k/year in your first post, and perhaps that is one of your requirements). Then find out what it takes to get there in your area. You may very well find out that there's no way...

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