Search results for query: *

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...

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.

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...

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

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...

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...

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

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...

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...

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...

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...

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)...

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...

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.

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...

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?

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...

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

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.

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...