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  1. AboveRedline

    Hydraulic roller lifter failure

    No one has mentioned the increased weight of using Inconel material for the valves. That should influence the pressure recommendation. For what it's worth we've been adding another 30lbs to the seat pressure of heads intended for hydraulic rollers as compared to scuffer cams. Ford and Chevy...
  2. AboveRedline

    Running an Engine on Raw Natural Gas

    Actually the customer is only looking for 30HP with 230 cid, at 2200 rpm. And they already have engines in the field, which have been successful enough to warrant a proprietary intake for their application.
  3. AboveRedline

    Running an Engine on Raw Natural Gas

    Thanks so much for all the replies. There is a separation system between the well and the engine, but it can't be perfect. Pat's suggestions are along the lines of what I was thinking. I think I'll keep the plenum small also, to bias towards good distribution instead of intake tuning via long...
  4. AboveRedline

    Running an Engine on Raw Natural Gas

    I think the issues are due to the gas being unrefined; straight from the well. I'm wondering what may be in it.
  5. AboveRedline

    Running an Engine on Raw Natural Gas

    Hey guys, We have a customer who runs engines on raw natural gas from either gas wells or condensate wells, in all weather conditions. Cold start is sometimes an issue, as is liquid(?) build-up in the intake manifold. So I guess I can't treat it as a dry vapor. Do you have any hints which...
  6. AboveRedline

    Sizing cold air intake

    1 kpa refers to plenum pressure, in other words atmospheric. Of course since you've spent some of your available energy on passing through a filter, and turning corners, don't expect a full atmosphere in the plenum. Usually the diameter of the inlet is whatever the throttle body o.d. is, and...
  7. AboveRedline

    Right/Left Wound Beehive Spring Mystery.

    The direction of the spring winding is specified on every valve spring blueprint. I fall into the valve rotaion direction group
  8. AboveRedline

    Sealing Up Rapid Prototype parts

    We recently purchased a Dimension 3D ABS Plus printer. The pieces were coming out great size wise but they leaked like seives. Dimension wanted $80 for a handball can size container of sealer. Someone told us to try MEK, methyl ethyl keytone. IT WORKS GREAT! In general brush it on and it...
  9. AboveRedline

    How to copy geometry from one model to another

    Try this In assembly activate the file you want to copy to (right click in model tree) In the assembly set the pick to Geometry and select a surface patch of what you want to copy. Hit edit Copy Hit edit paste. You should get a feature window. Select detail. A new window will open up. Now you...
  10. AboveRedline

    Teach me about intake taper...basic questions inside.

    A runner with more taper will have a broader torque curve than a constant cross sectional area runner, not as dramatic as shortening the runner but more taper will make the runner look shorter. If you can live with a narrow power band then constant area is the way to go as you maximize the...
  11. AboveRedline

    H-pipe vs X-pipe?

    If you have a nasty cam and a single plane intake manifold a crossover pipe (H) can pick up a lot of mid-range torque. It tends to fill in the hole in the torque curve. I didn't think it was ever about top end horsepower or exhaust flow, it probably looks more like adding collector volume in...
  12. AboveRedline

    Help wanted finding Inlet runner pressure vs crank angle graphs

    I don't quite get the graph you posted. If the red line is pressure in the runner, it's 2 psi (55 in H20) at TDC, then as the piston goes down and reaches max velocity the runner pressure goes to minus 2 psi... all good, but why does it spike all the way back up to 2 psi at 120°(before BDC)...
  13. AboveRedline

    NASCAR fuel scandal

    Here's the rumor I heard...The old NASCAR trick was to rub Sterno on the air filter (I assume the inside of it). It gives a boost in power for qualifying, and then gets washed away by airflow and then air/fuel in the manifold. The mistake must have been that someone fired up the engine before it...
  14. AboveRedline

    289 compared to a 351W

    Right-o Pat... the 289 has an 8.2" deck height and the Windsor is 9.5". As you can imagine raising the cylinder heads up and out creates a much larger engine so hood clearance and exhaust to shock tower clearance are two issues to be concerned with.
  15. AboveRedline

    Ideal intake runner termination design...

    My experience (geez about 20 years now) has been that a constant area runner with a flow path which is fairly close to perpendicular from the plenum using a corner radius of about r/D=.15 or greater tunes in better @ 3500-4500 rpm than a tapered runner on the same engine. We always thought of...
  16. AboveRedline

    Georgia Tech Reverse Flow Combustor

    http://www.gatech.edu/news-room/release.php?id=1020 Has anyone worked with this design before? I'm curious about the interation of the exhaust heat with the incoming fuel. Is the heating of the fuel part of the advantage of the design? Or is the fuel line insulated somehow?
  17. AboveRedline

    performance and fuel economy?

    To answer the original question... for best economy select tuning bits which bring peak torque to your cruise rpm. The torque curve follows the same shape as your VE curve. The BSFC tends to be best at peak torque as well. For best economy you'll want to be deep into the throttle on take off...
  18. AboveRedline

    Pro/E WF v. SWx for college setting: anyone for Pro/E?

    Shoelace, I've never heard of a section being the parent view. Sections should project off the parent.
  19. AboveRedline

    MOTOGP

    One of the bikes at the Laguna Seca GP race sounded awful, I belive it was the Kawasaki. Were they running a three cylinder engine? It reminded me of the V6 Busch cars of a few years ago, people would leave the stands to avoid the noise.
  20. AboveRedline

    Biomass Conversion...Is this a sham?

    http://news.ifas.ufl.edu/story.php?id=963 Alright gentlemen... let's dig in and analyze this one. My intuition tells me it's just another way to fleece the government for research and subsidy money. We'll need U.S. gasoline consumption data, agricultural data such as bushels/acre and...

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