Well the silicone is drying as we speak, so hopefully after Hell's Kitchen, I'll have a figure for the number of beers it will take. It might be a little inaccurate because I don't have plugs for the injector holes so I'm just taking newspaper and wading it up really tight in there and then I'll pour pretty fast. I'll fill it up to the bottom of the injector holes and take that measurement and then go from there.

 

I think I understand what your saying about runner wave dynamics, bell
mouth shape determine the particle back flow out of the runner. Correct
this to reduce the impact back flow has on plenum activity. Tuning to
a stronger harmonic would require longer runners. Correct me if I'm
wrong, Thanks.

 

Alright fellas, my preliminary results put the LT1 intake at approx. 4L. This is a very rough measurement and if I actually was able to keep the manifold level and effectively plug all the ports and minimize spillage it would probably be a tad less but I think that 4L is reasonably close.

 

Thanks for posting the pics. Courtesy of G.P. Blair? Did you read the whole article?

Notice how dynamic particle inflow effects do not extend far into the plenum. I'm not so sure there is all that much chaos above the runners. I also suggest that the heavy spitback shown may be from a strong tuning (or 'ramming') harmonic like the third, not the 5th we see in the LT1/4 manifold.

If you are really going for high NA power, or more correctly maximum BMEP at power peak rpm, have you noticed the lack of good EFI manifolds for LT or even LS engines?

Jon

 

That includes the runners, correct? Can you measure the volume of one pair of runners? I think all eight total nearly 1 L. That would make the plenum about 3 L (183 cu. in.) or just over 1/2 the displacement of a 355.

RRR, why was it you asked the original plenum size question?

Jon

 

Yes that includes runners.

I can try to. I could slide a piece of wood into it from the back to block it from the plenum and then plug the injector holes and fill it up. That will be tomorrow though.

 

Here's a link to the article from Blair, I have read it several times and
am still trying to get the information to sink in. Great read.

best bell

The LT1 is a very popular engine with drag racers locally. People come
to me to modify their intakes not because of my vast knowledge on the
subject, but because I am willing to question the design and try to find
ways to improve it. Information like the article from Blair helps to
reduce some of the guess work.

Yes I see a lack of good fuel injection manifolds in general. With the
LT1, one of the more popular alternatives is to convert a carb. intake
to FI.

A nice graft on wave tuning:

wave tuning