Hemi Build #3 -Boogie Woogie Woogie

[Kentucky Boy]

They look pretty good.

 

[ezcome-ezgo]

Nifty.

 

[Whitetrashrocker]

But the world is flat.....


Looking good there bobO.

Do you have a year planned in which you might get it running? Hehe.

 

[bob58o]

But the world is flat.....


Looking good there bobO.

Do you have a year planned in which you might get it running? Hehe.

It is a big deal for me to clear away space somewhere in my apartment and lay down some tarps so I can clean every part, nut, bolt,... with "cleaner" and then wipe with WD-40.

I would say I plan on doing this today, but I might put some fuel in the minibike and take it for a spin first.

My next day off is Thursday, so I hope to have a video of it running by then. I need to hit up the kids I work with for some adderall or something. I would of had this finished in March. LOL

I hate pharmaceutical companies and the joke that is Health Care. In the 1980's no kids had ADHD. How come every kid has ADD or ADHD now? It's not ADHD dummy, that's what I call inventing a problem. It's called being a kid and there isn't a pill to fix that!

These kids come into work, pop an adderall, slam 2 Redbulls and try to keep up with me, twice their age, who smoked a bunch of plants all day before work. LOL

 

[Whitetrashrocker]

Yup.
When I was a kid we were outside from sun up to when the street lights came on. We found a stick, a ball, what ever and made up our own games. **** throwing dirt clods made for some pretty cool imagination grenades. We drank out of the closest neighbors garden hose and loved the plasticy taste.

Kids these days.....

 

[ezcome-ezgo]

Garden hose water: the taste of freedom.

 

[bob58o]

Exhaust gasket and header.
This was an old practice gasket.

 

[bob58o]

If after an hour you still can't find the exhaust studs you removed from the head, check the spare head you've been using to mock stuff up on. The studs might be in that head.

Most oddly specific fortune cookie I ever got!

 

[bob58o]

When finishing a build makes you sad, so you do this to hold on for just a bit longer...

Orange? Red is the New Orange.
Black, Red, Shiny, or Bust!
(unless it is dull cast aluminium - which most of it is)

Had a bit of paint left in a can.
I couldn't have painted anything bigger.

 

[Randy H]

When finishing a build makes you sad, so you do this to hold on for just a bit longer...

Like when the bar closes and despite some hopeful prospects (like her friends won't let her leave with you, cuz she's even drunker than you are) and you realize your going home... To the wife.

I've never done that, but it would make me sad.

Anyways does this post summarize your build.
http://www.diygokarts.com/vb/showpost.php?p=497375&postcount=264

If your willing to share your simulation file, I have access to that program. I realize that you have put a lot of effort into it and is valuable in many ways. I won't be teary eyed if yah tell me to take a long walk off a short pier.

 

[bob58o]

Hope these pictures help.??

Some things I had a bit a info to support.
88 cfm for a 22mm carb - I came across that on another forum.
low to mid 30's % flow for the intake port - also came across that on another forum.

Some of the flow effiency Stuff I picked 85%. If you click on things, they give examples and calculators if you have data.

Playing with the exhaust length gives different VE Overlap gains/losses. 36" would be nice. I used 22" for this sim. Couldn’t figure out how to do a staged header so I used average ID.

I used 112 octane to prevent the program from retarding my ignition at low RPM.

When I first started I loaded up the 5HP Briggs and the 5HP Race Briggs Engines they have stored in their Engine database.

 

[Randy H]

Thanks. My brain doesn't enjoy math anymore. Doesn't mean I can't punch in numbers and feel like a scientist.

This isn't my app, just comparing info for kicks. This is an older more advanced edition.

I got lazy and just took pictures of my monitor.

 

[bob58o]

Thanks. My brain doesn't enjoy math anymore. Doesn't mean I can't punch in numbers and feel like a scientist.

This isn't my app, just comparing info for kicks. This is an older more advanced edition.

I got lazy and just took pictures of my monitor.

How does it compare to the exhaust pipe design program you have?
And what exactly are you showing in those sceen shots? I'm tired and probably missing the the important info you are showing?

 

[Randy H]

I'm trying to compare the two now. It seems PipeMax is more liberal with performance numbers. I'm still experimenting.

Those crappy images show the advanced exhaust pipe calculation parameters, multi stage (3). The other is advanced ignition timing parameters.

Maybe you tried the demo? It's pretty expensive for us DIY types.

 

[bob58o]

I'm trying to compare the two now. It seems PipeMax is more liberal with performance numbers. I'm still experimenting.

Those crappy images show the advanced exhaust pipe calculation parameters, multi stage (3). The other is advanced ignition timing parameters.

Maybe you tried the demo? It's pretty expensive for us DIY types.

I tried the demo trial a long time ago.

Here is some of the data I referenced...
If I input 51% for intake flow, then there are a couple more HP to be had. A significant difference.

 

[Randy H]

51% is that an arbitrary number? I'm guessing your head flows as well as the one in the chart, and more on the exhaust. At least a touch more then you might need for 5500 RPM. Lol.

51% instead of 33. 6%?

 

[bob58o]

Camshaft break in.
Stock Springs.
Stock Rockers.
Stock Gasket.
38 idle Jet
160 main jet (never opened throttle)
Needle clip 1 position lower than middle.

Idled down to around 1100 before sounding rough.
Wouldn't start first pull with choke on and mixture screw 1.5 out.
Wouldn't start without the choke.
Opened up the mixture screw (allowing more air) and it got closer to starting.
Opened up the mixture screw to 3 turns (allowing more air) and it still got closer.
Opened up the Min Throttle stop (allowing more air) and it still got closer.
Pulled the throttle open a bit with cable and it started right up. By this time there waas probably plenty of gas in the chamber.

Didn't try to start it warm.

After a few minutes of run time, I set the RPM to around 1600 and played with the mixture screw. 1.25 turns out brought me up to around 1650. More than a 1/4 turn in either direction and it started to drop a bit.

This was a 0.38mm pilot jet. I also have a 0.32mm and 0.35mm or 0.42, 0.45, and maybe 0.40mm

108 dB right next to the exhaust.
97 dB at an arm's distance.
85 dB at around 10 feet

https://www.youtube.com/watch?v=a5pBImWYQqs&feature=youtu.be

 

[bob58o]

51% is that an arbitrary number? I'm guessing your head flows as well as the one in the chart, and more on the exhaust. At least a touch more then you might need for 5500 RPM. Lol.

51% instead of 33. 6%?

From Here..... Not arbitrary, but maybe wrong, Maybe not???
Flow % before and after. 36% (probably my mistake or maybe I picked 33.6% from an example)
My valve lift is .336 with 1.2's

 

[Randy H]

https://m.youtube.com/watch?v=0VkrUG3OrPc

This clip is probably more accurate.

https://m.youtube.com/watch?v=x3p2nOzW77Q

 

[bob58o]

After 20 minute cam break-in.....

Does this say much?
Plug reading after 20 minutes no load idle??

Looks lean to me, but the first start had me guessing it was rich???