Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

There are other ways to affect the way a bass reflex enclosure is tuned that is not directly related to volume. By varying the amount of polyfill that you use within the box, you can simulate a larger enclosure and achieve performance results that match a larger box with less fill.

In other words, while there is absolutely a precision level of science to all of this, which SkinnyG has so proficiently demonstrated, you also have some wiggle room with the size of your enclosure which complements the science with duct tape and bandaids.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

I do plan on installing poly fill. Thanks for the comments.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Here is the box so far

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

So after the great advice from SkinnyG, i redid a few of the dimensions, of course after cutting the front piece and now i need a complete new sheet, but live and learn. After all calculations are in, the box ended at free air (not including the vent) of 1.18 cubic Ft. Then taking the vent at .11 cubic ft from the i ended up with 1.07 cubic ft of air space per sub. I will be adding poly fill also to increase the "air Space" a small amount, but overall i am happy with it.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Very cool. I have a similar slot port box in my '77 with a single 12".

There is talk that a "slot" port like that will act a little lower than a regular port in an "open" box, as the "walls" the port uses extend the tuning frequency lower than the actual "port wall" itself is cut to. I think you add half the port height/width to the tune length, but I've forgotten exactly.

However,

It's going to thump awesome. It'll work.

I'd stuff some poly fill in there regardless.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Thank you sir, i plan to stuff some poly in it for sure. Just now we are waiting on the subs... hard to get...

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

So I just wanted to give you a big shout out! since talking with you and then i increased the box size, I got a message back from JL Audio. The developer for their boxes emailed me back with what he thought about my dimensions for the entire box including the port. He said that the tuning frequency of the box will be right around 33.15 HZ and the response curve and port velocity should be great. So again, Thanks for your responses especially. I appreciate all the others too, but you really got me back into paying very close attention to dimensions.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

(big.grin)

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Used a jig to get holes cut.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Part done

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Done

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Painted

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Speaker wire connectors

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Box set into its place, plenty of room, suggestions how to secure it there?

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

2nd pic

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

OEM-looking gas tank straps would be cool.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

hmm.. Interesting thought there, i must look into this.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Very cool build! Looking forward to catching up on this one.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Thank you. It has been and continues to be an adventure... lol

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Ok everyone, i am looking for suggestions for Aluminum Radiator with Electric Fan/Shroud. Please give input. I find them from stock looking replacements to really wide ones. not sure what is best, easy, yada yada... 3 - Row, 4 - Row, 1 large fan, 2 smaller fans.... damn help someone please..

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

I am currently looking at a 4-row with electric fan and shroud by Alloyworks.

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Well now looking at reviews.... maybe we do Cold Case radiator?

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

I used RND fabrication...made in the US and are a sponsor. I use a Derale electric fans...2000 CFM...one for cooling one when the A/C kicks on. I think one fan would have been enough...but 2 is more better right? LOL

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Sorry for my confusion, but when you say sponsor, you mean a sponsor here on the site? Did you buy the rad. with fans or without?

Re: Starting 1966 Factory Short Bed Build, Bagged, 383 Stroker and Muncie M20 4-Speed
 

Yes, sorry for the confusion...site sponsor. I bought it with a single fan, but I took my truck to have my A/C finished/charged and they said they recommended a second fan dedicated for the compressor. So I put a new shroud and fan on the radiator (Derale). In hindsight, I don't think I needed it. So now I have an extra fan...ugh! This was before the new fan/shroud with single fan. I don't have a picture yet of the new fans.