I took some pictures while working on the base and super ram.

 

 

 

 

Its gonna be one fast mother....

 

Wow! The base transitions are HUGE. And, I'm totally impressed with the SR base and runners.

Great work.

 

bout to say that thing looked like CRAP until the final pics

good work

 

I hope you didn't totally kill your bottom end with those big holes, which may cause a slow intake charge.

When I was building my 406, Lingenfelter told me my 550hp+ motor did not demand either port matching or any porting of my SR.

 

You definitely subscribe to the "the bigger the better" port theory. Hope it works for you. So much for pulse tuning.

 

Not even port matching? That seems kind of stupid to me, especially from a company like Lingenfelter.

 

try some flap wheels (120 grit) and some of the dremel sponge bits, itll help that rough finish turn out satin like

 

Methinks they know of whence they spoke.

The ports were not too far off. Perhaps any turbulence was either helpful or too minor to have any detrimental effect.

SEMA did tests decades ago and others know what Boyle's Law states about the relationship between volume and pressure. No surprise to me. For a street motor, there may be no low end, but he may be running high revs on he track, given his profile and posts.

 

I thought the port mismatches were incredible. Some were off an 1/8". Nothing lined up well at all, but it does now. Some castings are better I'd bet, this one wasn't to good.

In this thread they picked up 30 HP with a 406.
http://www.thirdgen.org/techboard/al...fications.html

Ralph here lost power when he siamesed 2.5" in so I only cut them back 5/8" or so. The blended in edges on the plenum have been a proven gain on TGO. I thought of it like a valve job by cutting the angles but then blending it smooth. I matched it all to a 1205 gasket which isn't that huge. I doubt the little bit I did would effect the third pulse wave but I'm not an expert on it.

I did come back with sanding drums to smooth it out. Not just the roughness but the uneven depressions from removing metal. The first pics are in progress cutting. The one pic shows the near side radius coming back 1/8". That was my initial cut. The air has a much straighter path now.

 

The first pics look a little rough...but that's what happens with carbite bits and is part of the whole porting process......as the job progresses by use smaller an smaller bits/rolls/flaps it starts to "look" better. I think you've done a fine job! It doesn't really matter how it looks to the eye as long as it is smooth touch and the areas are still semi-symmetrical. Can't wait to hear the HP/torque results.

 

I made another pretty big pile with the drums. I'll let you all know if it sucks or not. I've got to get dynoed for my race class. I'm hoping to drag it this Friday.

Before:



After:


Runners together:

 

Boy...I'll tell you what. I was surprised at how big the head transitions were ported in this thread. After all, a 1204 and 1205 are pretty close in measurements.

But, tonight, I laid a 1205 on my Edelbrock base. I guess it won't be a surprise to Aardwolf that I see a similar amount of material will need to be removed for a port-match.

In my case, I'm doing the psuedo SR by mega-siamesing SLPs. So, the runners will be a bit longer and smaller. Plenum will be smaller too.

In consideration of the comment about losing low-end torque by opening up the transitions and making them match, I'm not convinced of the downside. (OTOH, the smaller base holes would still have been covered by the 1205 head ports -- so it wouldn't be a "bad" transition going into the head, just coming back out. Reversion waves might cause turbulence hitting an unmatched intake though.)

If un(port)matched velocity could be higher as the air was forced thru a smaller hole on it's way to the head. But, that sounds about as useful as when I debate the pros of a TPI! So, I vote for port matching.

Maybe Lingenfelter felt a sufficient amount of air could make it thru a base outlet w/o the "necessity" to port -- at least until 500hp. You know....necessity is such a vague word. Picture someone going into a "Lingenfelter store" and saying, I don't think I can port intakes. I was going to buy one of yours except I can't port it to match my heads. Anyone here picture him saying "Well, that's not necessary!"? You know... some speed shops don't want to give away ALL the secrets. Don't you think they want to win when racing their customers on Sunday?!

If anyone cares, I'll try to remember to take a pic of the 1205 laying on a big-base -- so you can see how much bigger it really is!

gp

 

I bought one down the line from, and Kwik88 had it done real nice inside and out. I see I will need some new heads or some nice porting for sure.

Andrew yours will flow for sure, and I would think you had the right idea. I would rather do it that way the first time, then doubt later if I should have done something different than all the rest.
good work

 

Well the car feels faster on the low, mid, and top end. I definitely don't feel it lost any low end power. It was a freaking 110° on the blacktop at the drags last night so the times don't compare to well to the last time I ran there. My best last night was 12.9 at 106 MPH with a 1.91 60'. Last year on the same street tires I was pulling 1.85 and it was 40° cooler with better track prep. It pulls hard to 5,400 RPM, I'll dyno it next and check the power curve. I think it may need more RPM. I had a terrible time hooking last night.

 

so it has not changed your power curve that much? do you think you have more torque if you can't hookup any more? I expected you to say that sucker flowed to almost 6 or so really!! hopefully with some fine tuning it will make a huge difference. Although you already had a ported out tpis set up, so maybe from stock it is a much bigger difference. How are you gonna get more rpms? do you think the cam is limiting you now?

good luck with dyno and tune

 

This SR setup changed the power curve a lot. While setting up the governor for 5,400 RPM I still had the large tube runners on. Acceleration totally died at 4,900. Now I don't notice the acceleration dieing off but I didn't get to make enough runs to manually shift it higher. It was busy, the crew was slow (so hot!), and several cars broke on the track.

It feels like it has a lot more torque but that didn't cause me to lose on the 60'. My 1.91 launch felt good but was very difficult to duplicate, the track was greasy. Lane one seemed worse and I couldn't always avoid it.

The cam has always been a limit. I'll get up classed to much changing it out though so for now it will stay stock.

Looks like my previous best there was 13.23 at 102 with 1.87 60'.