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MY AVID Mk4 RX-1...build

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Posted

I started this project, like most people who retire...with somewhat unrealistic goals. Those were soon squashed...and I had to  

resume, on the same pace as when I had a job. Now, my time is being pulled in so my directions, I am lucky to get anything done... but

I plug away...As far as posting  all this...I am not a very good typist  or computer wiz...so we will see.

I am doing everything...tube bending to welding...and trying to enjoy the work.

 

Here is where we start...Tore out the 582 ...FWF

 

Next...I set up a laser and determined how big to build a box...to put on top of the cart. You can see the studs and crossover

piece...sitting up front. I decided early on, that I wanted a one-piece motor mount...and that I was only using original connections.

Built the motor mount with the idea of using the original airbox as well....That may change. The crossovers may also serve as 

mounting points for oil/water tanks etc

 

Next...Mount with caps and crossovers in place...After that...just a lot of bracing tacking and fitting.

Here is a pic of the finished mount.. I decided to just paint it...so any cracks etc will show up easier upon inspection...I thought

the powder coat could hide things.

 

Here it is hanging...   Next, start exhaust.

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Posted

Nice!  I better kick it in gear here or you're gonna pass me up!

Looks like you'll have the same "bubble top" cowl as me, or are you going to be able to fit it under there?

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Posted

You are exactly right...I have to lengthen mine 6" anyway....So what is a little "Bump out" ..on top. 

I can't afford to pass you up...You post great ideas...and sources...That I will have to use anyways...:lmao:

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Posted

Here is a positioner, that I built off U-tube, using a bicycle...it is powered by a cordless drill...zip tied to

the frame. To the right ...is an adjustable rest. Worked great on the studs and the exhaust flanges

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Posted

The start of my exhaust system...I ordered a box of 36 feet of misc. bends a.k.a.  rejects from and

exhaust company. Summit Racing...is who I ordered from...1 3/8" exhaust bends

That and a collector (4 into 1) from Great Plains and I am ready to go.

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Posted

Placed the collector... and bent a heavy piece of electrical cable (I picked 28") to simulate my pipe.

Here is my first pipe... tacked up. You can see the cable hanging off the mount. 

I placed the collector so it is a straight shot to the exhaust can...which I will weld a mount for... off of

the nose gear brace.

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Posted

how come on these engines you guys run 4 pipes can you not just make a manifold type exhaust and go into one pipe?

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Posted (edited)

how come on these engines you guys run 4 pipes can you not just make a manifold type exhaust and go into one pipe?

These puppies need to breath right or you will miss out on a ton of HP that they are capable of.  Header design is well beyond my knowledge and experience so I went with advice from others, but here's a quote from a performance shop that sheds basic light on the topic:

"Header primary tube tuning has two basic parameters: airflow requirement and exhaust pulse tuning.

Tubing diameter is dictated by flow requirement, which in itself is determined by engine displacement and rpm...

Header primary length has to do with timing the exhaust pulses so that the exhaust from one primary helps to suck the gases from an adjacent cylinder."

 

It gets real deep.  Bore, stroke, valve duration, and other factors change design parameters.  But in a basic sense if the header isn't done right it will have the effect of putting a potato in your tailpipe!

Edited by Yamma-Fox
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Posted

Thanks...Y-Fox. I do NOT design anything...I merely shadow paths.. blazed by others. They have done all the REAL work. Testing...over and over...improving as they go

I show up...when everything is pretty well figured out....and build what works for me. Simple as that...          John O

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Posted

Me too!!  ^^

I never would have went Yamaha until others dialed it in and proved it out.

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Posted

Two pipes down...

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