Simonini that wanted to be a sidebleed

I posted this in the performance page because we all this is going to make a lot more power.

Dirty Dillion be like yup more power

Might add a m8 thread set up on the end so I can use mlm whistle tips

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Re: Simonini that wanted to be a sidebleed

Cool

Re: Simonini that wanted to be a sidebleed

This is my weekend project...

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Re: Simonini that wanted to be a sidebleed

> Blocky Mc Blockface Wrote:

> -------------------------------------------------------

> This is my weekend project...

Haha 2020 the year of sidebleeds!

On a serious note do you think its a performance gain? Hoping for more bottom end but I think I hurt the top end.

I had this idea to run valves to choice where to exit the exhaust from.

Re: Simonini that wanted to be a sidebleed

> Rocco Taco Wrote:

> -------------------------------------------------------

> > Blocky Mc Blockface Wrote:

>

> > -------------------------------------------------------

>

> > This is my weekend project...

>

> Haha 2020 the year of sidebleeds!

>

> On a serious note do you think its a performance gain? Hoping for more

> bottom end but I think I hurt the top end.

>

> I had this idea to run valves to choice where to exit the exhaust from.

For yer pipe I would imagine you'd see a broader power band with less hit. With the circuit pipe I actually put a bigger header pipe on it when I did the side bleed. So I did see a performance increase but also noticed a broader range of rpm in the powerband.

I welded a nut on the exit for different size mlm Allen bolts for adjustment. For me, the smallest size worked best. The larger sized one did not work very well.

It's kinda goofy in that mine hits twice. It seems like you've topped out then it starts to go again. Probably more of a dead spot really.

Re: Simonini that wanted to be a sidebleed

Yea I add an end bleed tonight, just a normal Allen bolt for now with no fancy hole.

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Re: Simonini that wanted to be a sidebleed

So maybe some gurus can chime in on this on, because my post is largely word vomit.

From what i've read in 2t tuning books, a sidebleed pipe at the largest belly section will be considerably quieter because the pulse is at it's widest point in the chamber. For any mass produced pipe, it will not perform better than the converging section to a stinger.

But, depending on where your peak RPM is, you can tune the belly section to resonate at that RPM. That way, you are maximizing the pipe while keeping the noise level to it's minimum.

Even with a side bleed pipe, you have the option to play with the stinger length and I.D., which does play a role in low end/high end power/sound.

This post is from 2004 so is dated. Since then, there has been some improvement in exhaust tech. https://www.prestwich.ndirect.co.uk/tunedpipetheory.htm

take it with a grain of salt i guess (edited)

Re: Simonini that wanted to be a sidebleed

. (edited)

Re: Simonini that wanted to be a sidebleed

Dirty30 Dillon /

Probably a milder hit, and reduced over-rev.

Probably should tie the stinger back into the main body, or it's gonna break off.

Re: Simonini that wanted to be a sidebleed

♣Slew Foot♣ /

I got a candlestick I lost my baffle on the techno estroil sidebleed plugged the back with a hex and ran a stack. A Tomos outside muffler section 7" and ran it to bottom epoxied it. Its held 3 years. Bug boost bottom and top. No restriction and its silent when it hits it groove @35mph loud idle and deceleration 3 peat chugs brapppbapbap.

Re: Simonini that wanted to be a sidebleed

I did something wrong because the pipe never came on. I might cut the stinger shorter but I’m over it right now (edited)

Re: Simonini that wanted to be a sidebleed

> Rocco Taco Wrote:

> -------------------------------------------------------

> I did something wrong because the pipe never came on. I might cut the

> stinger shorter but I’m over it right now

Did ya try different end bleed sizes?

Re: Simonini that wanted to be a sidebleed

Dirty30 Dillon /

> Rocco Taco Wrote:

> -------------------------------------------------------

> I did something wrong because the pipe never came on. I might cut the

> stinger shorter but I’m over it right now

Simonini has been building 2t motors and pipes for decades, if sidebleeding this pipe increased performance they more than likely would have done so.

Re: Simonini that wanted to be a sidebleed

> Dirty30 Dillon Wrote:

> -------------------------------------------------------

> > Rocco Taco Wrote:

>

> > -------------------------------------------------------

>

> > I did something wrong because the pipe never came on. I might cut the

>

> > stinger shorter but I’m over it right now

>

> Simonini has been building 2t motors and pipes for decades, if

> sidebleeding this pipe increased performance they more than likely would

> have done so.

Lmao

Re: Simonini that wanted to be a sidebleed

the thing that gets me and I think gets alot of others too is just the way the stress distribution is for that baffle, it's pretty easy to rip or just fatigue a sidebleed off. how're y'all reinforcing these to get em to last?

Re: Simonini that wanted to be a sidebleed

Best thing is to add a brace to Hold the silencer. I just did get there yet because I’m still “tuning the pipe”.

I was go to use cables like a bridge

Re: Simonini that wanted to be a sidebleed

I've built a few center bleeds. One thing I learned is the rear end should come to a point, or close to it. It's better for the return pulse.

Can't tell from the pic but yours looks like you just chopped the end off?

The side stinger plays a big part, much like an end bleed. I've found that centering it in the belly works best. Length and diameter follow the same basic principals as an end bleed stinger. And yeah, gusset that pipe on there. You're attaching it to the thin wall of the belly, and it's gonna want to break off. Especially since you're probably gonna kick it or step on it, depending on where it's mounted.

The end bleed tiny hole trick never worked for me. Or anyone else that I've read about. I made my pipe with a threaded end that I could screw carb jets into, easier than drilling mm holes in a bolt, and I thought, " man, that's a brilliant idea, this is gonna work awesome."

After testing it at the track, it didn't do shit, no matter what jet size I used it just went slower. So I blocked it off and it's much better.

Mine has that 2 step power hit, too. And it's definitely not a dead spot. Hits kinda softly in lower midrange, keeps accelerating, then boom! Hits again at high rpms and keeps blasting.

Definitely quieter, too. My pipe has no silencer, and makes less noise than a muffled pipe.

I'm not claiming I'm the center bleed guru, but I've built a ton of pipes, did a lot of math (mostly using Bell and Jennings formulas) and tuned them off their basic guidelines, making modifications to fit my set-up.

Here's the pipe on my V1 "bicycle." Next race, I'm gonna mess with stinger diameter and see if I can go faster with a smaller diameter and not blow it up.

(And before anyone says "you're header should be longer blah blah blah," it's designed for track use only. I want it to hit hard and it does. The few times I've ridden it on the street, it sucks. It's not designed to cruise around at 35mph.) (edited)

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Re: Simonini that wanted to be a sidebleed

DrGeorgeTompson (Alan) /

The baffle snapped off my treats banana blaster so i'm planning to side bleed it using a stock pug exhaust as the baffle. Should work good if i can get the ground clearance to not suck.

I'm primarily motivated by the reduction in noise.

Re: Simonini that wanted to be a sidebleed

I made it so the baffle was real close to the pipe itself, threw a small piece of metal inbetween and welded em together.

Good to know that others have seen the pipe hit twice.

I was wondering about closing the end bleed off completely but never tried....

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Re: Simonini that wanted to be a sidebleed

> Blocky Mc Blockface Wrote:

> -------------------------------------------------------

> I made it so the baffle was real close to the pipe itself, threw a small

> piece of metal inbetween and welded em together.

>

> Good to know that others have seen the pipe hit twice.

>

> I was wondering about closing the end bleed off completely but never

> tried....

That looks great! I just hate the cylinder mount..chatter shatter

Re: Simonini that wanted to be a sidebleed

Overpriced Parts /

Love the Polini space filter without the cover!

It is the only foam filter that works good with a dellorto or mikuni carburetor (any carb really) with the exception of a K&N type mesh filter! why people use double wall uni filters and other junk foam and other totally ridiculous and or restrictive filters I will never understand! It’s k&n, large mesh or Polini space filter or none,

I’ve used more open red foam filter material in the space filter also and gained 1 jet size too,

The Polini space filter will not get saturated with gas, water or anything condensation as well as ice, snow rain for any length of time,

I’ve just rode recently with a friend of mine who had a tomos with the double foam uni filter and the moisture on it froze @30 degrees when sun set on a mid 40s degree day after we were parked for a few hrs,

It was like him running with his choke on so we had to yank the filter and then he ran lean and stalled a few times, first time he locked so he probably soft seized, what a joke!

Just seeing that filter means I know you know what you’re doing :)

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Re: Simonini that wanted to be a sidebleed

Thanks. But... That filter fell off after maybe 2 practice laps. The little plastic cage snaps on, and it snapped off. Then it got ran over. Now I have a black clown nose filter I made out of a microphone cover.

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Re: Simonini that wanted to be a sidebleed

Yo guys put silencers on those pipes your going to get us in trouble.

Dirty Dillion be like yea guys!

Re: Simonini that wanted to be a sidebleed

Alan Jackson /

ive made 3 pipes but no sidebleed as of yet.

is there much difference between a normal stinger that goes all the way into the belly touching the side and a sidebleed?

Re: Simonini that wanted to be a sidebleed

Dirty30 Dillon /

> Rocco Taco Wrote:

> -------------------------------------------------------

> Dirty Dillion be like yea guys!

Rocco Taco be like "modded my pipe, now it's worse!"

Re: Simonini that wanted to be a sidebleed

Are you extending the stinger into the chamber like on this video, or welding it flush with the cone.

Re: Simonini that wanted to be a sidebleed

> Dirty30 Dillon Wrote:

> -------------------------------------------------------

> > Rocco Taco Wrote:

>

> > -------------------------------------------------------

>

> > Dirty Dillion be like yea guys!

>

> Rocco Taco be like "modded my pipe, now it's worse!"

I really didn’t know what else to expect! All my mods go down hill! Lol

Re: Simonini that wanted to be a sidebleed

Alan Jackson /

it went right inside into the belly

from this

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to this

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> - Joe - Wrote:

> -------------------------------------------------------

> Are you extending the stinger into the chamber like on this video, or

> welding it flush with the cone.

>

>

Re: Simonini that wanted to be a sidebleed

I might try redoing it, y’all blowing up this post. i welded it flush. The motor was chocking on exhaust fumes, I made the stinger to long and exhaust fumes are building up to much pressure in the expansion chamber.

I could open the end bleed but it’s so fucking loud.

Re: Simonini that wanted to be a sidebleed

Dirty30 Dillon /

I like that you left the plate exposed but PS'd the face lol.

And in the second picture, it looks like you just removed the stinger/baffle?

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