Hi, does anyone make spacers for the street manifold? I have a mildy built b20v (endyn formula circa early 2000's) that I'm reconsidering this purchase on. I had read in the other thread about myth busting the short runners and big plenum volume.

I'm considering making my own if they aren't available. I believe I can almost double the streets plenum volume by adding my own 2" spacer. I was thinking of using polypropylene as it's much cheaper than having a custom aluminum piece made up for something I'm not sure will even seen gains.

But it makes sense right that it would work and be better?

I'm stuck on this and cams before hitting the dyno. Maybe I should have just bought the race but I'm looking for more mid range then peak hp.

 

Anyone?

 

I had a plastic spacer made to test fitment and have been planning on having a few aluminum versions produced. But, I've been slacking. I guess I need to get on with it.

 

I'd be interested in seeing a test, or even pitching a couple bucks in to try it out. Ive always thought the street version would benefit bigger motors with roughly .75-1 more liter of volume

 

My guesstimate math says by adding a 2" spacer would add near 2 liters of volume. Ideally, 1.5 times the liters of the engine.

 

Polypropylene melts at about 210 degrees. The plastics that will hold up will cost more than aluminum Ryton, P.E.E.K. etc...

 

Skunk2 is currently making the ultra street spacers not sure when they will be released though!

 

Update: Had a small batch made in 1/2" thick.

 

That's pretty awesome. If my shitty math is correct working off a spare gasket in front of me using a digital caliper, 4 of these or a 2" spacer is approximately 1.356 cubic liters. + 1.82 from the skunk2 manifold = 3.176 which is a nice bump, near ideal if you're looking for 1.5 times the volume of the engine.

How much for a 2" spacer?

 

I calculated 0.35 liters per 1/2" spacer so 2" would be 1.4 liters. Please pm me about pricing as I am not a vendor here. These ones are already spoken for but I am planning another, larger run next week.

 

PMd u

 

Would there be substantial gains with boost using this spacer?

 

I would imagine so. I will be testing on a 450whp b16 soon so I guess we'll find out.

 

I plan to use this on a 300+ whp Supercharged setup.

 

So has there been any progress on getting these out?
I'll be using a Ultra street on my build and this spacer along with the planned porting job would help quite a bit.

 

We've done some testing on NA cars - Anything bigger then a 3.5L loses some power. The K series seems to like the bigger plenum spacers.. I'd assume a Turbo car would gain some power as well.

 

Yeah likely too much velocity loss so cylinder filling isn't quite what it should be. I figured somewhere right around 2.7-3.1 L would keep my B20 nice and happy

 

Im working on it. Just taking much longer than I had expected.

This manifold is only 1.82 liters to start so I believe there is some room for improvement on a lot of applications.

 

paypal ready here just lmk

 

^^^^ same here

 

I will keep you all updated.

 

Got a new batch in. Everyone has been pm'd that asked. Anxious to see some testing done!

 

**** just got real!!!

 

Still working on getting some testers. All cars I have available are hibernating for the winter lol.

 

Would love to see the outcome of these. Most likely will pm you for one shortly