3 into 1 exhaust jota

[Laverdalothar]

Next rotation this is reversed

Hopefully...

 

[Scrumpy]

That Mez bloke was the bloke who did the porting on that Motodd Mark 5 race bike that Alan Cathcart won a world title on, Bath Tube style head. BTW that bike was for sale a little while ago.

He did the head on the Mk4 that i recently purchased. That reminds me I have some work to do on it!

 

[The Sock]

 

[TheWrongTrousers]

View attachment 59412

You back on the road now then, Hamish ?

 

[The Sock]

You back on the road now then, Hamish ?

Since the 3rd.

 

[TheWrongTrousers]

Since the 3rd.

Ah - well done. You are way ahead of me, but mine is coming along in leaps and bounds you will be pleased to hear !

 

[redax5]

Mule's 3-1, took 55 Dyno runs to get right

ehaust system

 

[piranha-bro2]

That is a stunning photo, Red. And the time dedicated to the ex sys makes it probably one of the most expensive parts of the race bike!! I'm guessing they are smaller ID headers exiting the head than stock?

 

[redax5]

That is a stunning photo, Red. And the time dedicated to the ex sys makes it probably one of the most expensive parts of the race bike!! I'm guessing they are smaller ID headers exiting the head than stock?

no headers are larger then standard but we did weld up the exhaust ports and reduced the head diameter on the exhaust valves, been a lot of work go into flowing the cylinder head

 

[Vince]

Probably stepped headers, it produces a pulse that is timed to arrive when the valve timing overlaps. There are formulas that help with designing this effect for a particular rev range, and then you start experimenting to get real-world effects. Swirled Circular collector design does the same thing, and inlet length has a similar effect. Variable inlet even more so. There was a Yamaha 1000 that had an electrically controlled exhaust chamber as well. There must be millions of variations available no wonder there was all those dino pulls.

 

[piranha-bro2]

EXUP - Yamaha's variable exhaust back pressure system on the FZR1000s. Then there's variable valve timing and probably inlet length - so you can have max torque in every part of the rev range from idle to redline!!

 

[The Sock]

I wonder if this might be my old exhaust system.
3 into 1 Exhaust
If so, it wasn't "developed on a dyno" but end plated in a effort to quieten the factory system's excruciating noise level.

 

[hooksey]

I wonder if this might be my old exhaust system.
3 into 1 Exhaust
If so, it wasn't "developed on a dyno" but end plated in a effort to quieten the factory system's excruciating noise level.View attachment 61327

Xactly same as the system that was on my ole 81 Jota.... worked ok !
Same outlet that’s on the stock 3 into 2 mufflers, maybe a little smaller in diameter.

 

[helicopterjim]

Xactly same as the system that was on my ole 81 Jota.... worked ok !
Same outlet that’s on the stock 3 into 2 mufflers, maybe a little smaller in diameter.

Same ...... except only one instead of two.

Jim

 

[Love..rda]

I'm going to try this, new design...

 

[iis_iis]

There was a Yamaha 1000 that had an electrically controlled exhaust chamber as well. There must be millions of variations available no wonder there was all those dino pulls.

Yam EXUP, Doug and myself started tinkering with the exhaust electric gated assembly, controlled by new variant iis module. Completed some basic engineering and decided the old 180, would yield more from other improvements, as Redax has carried on in spades, also Steve B as i understand it. Also had included the iis with exhaust header temp real time readout and control loop function, main impetus was to mitigate cracked inlet stubs, destroying piston crowns. Think the average temp was around 450C external first bend on the headers. j