Inlet upgrade?

Stephen_Spencer · May 7, 2021

Fast Eddie said:
I never said a word Clive....

Long live the lovely longs!!!!!

iwilson · May 8, 2021

Vernon240 said:
I'm personally holding out for the dyno video. There is a dyno video, right??!?!?!?

In light of one not being forthcoming, here’s one I prepared earlier.... 5 years earlier

Al's#5 · May 9, 2021

iwilson said:
In light of one not being forthcoming, here’s one I prepared earlier.... 5 years earlier

Not having access to a Dyno I'll plumb for what gives the best feel, sounds and looks, personal taste accepted. Good feedback and guidance gratefully received.

Clive · May 10, 2021

Vernon240 said:
I'm personally holding out for the dyno video. There is a dyno video, right??!?!?!?

Unfortunately due to health and efficiency regulations we have to stand at least 2 miles away in an ex cold war bunker with ear defenders and buckets on our heads. Now they know me I will try next time but it will need a decent microphone. They have an offer now so anyone with an ACU racing license can get a dyno run for £25

BTW Tony my longs were made with the first section plain tube instead of perforated so I'd like to think the flow might be slightly better. I have to admit that when I was working on the bike with the longs off I did rather like the look of it. I am beginning to appreciate the look of race bikes more and have always liked the look of the welded meggas. Perhaps adapt some cheap shorties and see what effect they have?

Maybe I have been blinded by the tawdry shinyness of the longs and Nigel's perverted obsession with the stumpy excrescences he laughingly calls exhausts is the true path of exhaustion. Did I mention I just bought a K*w*s*ki which has all the audible charm of a sewing machine wrapped in a duvet?

Vernon240 · May 10, 2021

Clive said:
Unfortunately due to health and efficiency regulations we have to stand at least 2 miles away in an ex cold war bunker with ear defenders and buckets on our heads. Now they know me I will try next time but it will need a decent microphone. They have an offer now so anyone with an ACU racing license can get a dyno run for £25

Shame

once you become a regular customer though

TonyA · May 10, 2021

Clive said:
Unfortunately due to health and efficiency regulations we have to stand at least 2 miles away in an ex cold war bunker with ear defenders and buckets on our heads. Now they know me I will try next time but it will need a decent microphone. They have an offer now so anyone with an ACU racing license can get a dyno run for £25

BTW Tony my longs were made with the first section plain tube instead of perforated so I'd like to think the flow might be slightly better. I have to admit that when I was working on the bike with the longs off I did rather like the look of it. I am beginning to appreciate the look of race bikes more and have always liked the look of the welded meggas. Perhaps adapt some cheap shorties and see what effect they have?

Maybe I have been blinded by the tawdry shinyness of the longs and Nigel's perverted obsession with the stumpy excrescences he laughingly calls exhausts is the true path of exhaustion. Did I mention I just bought a K*w*s*ki which has all the audible charm of a sewing machine wrapped in a duvet?

Which Kaw ? ZX6R ?

Clive · May 10, 2021

TonyA said:
Which Kaw ? ZX6R ?

A very clean UK spec zxr400l - I can use it in our ClassicRacingMotorcycleClub races; very inexpensive and less chance of doing me or the bike much damage. If I was going for something quicker I would probably go for a Triumph Daytona 675R but an altogether different proposition. It'll be fun to play with!

A very clean

Fast Eddie · May 10, 2021

Fabulous track toy there Clive. Your entire maintenance schedule will be changing comsumables and... well... that’s all...!

Oh, and maybe the odd bit of crash damaged plastic...

TonyA · May 10, 2021

Clive said:
A very clean UK spec zxr400l - I can use it in our ClassicRacingMotorcycleClub races; very inexpensive and less chance of doing me or the bike much damage. If I was going for something quicker I would probably go for a Triumph Daytona 675R but an altogether different proposition. It'll be fun to play with!

View attachment 79739
A very clean

The Kaw 400 Ninja was rated above the KTM 390 R in an article I read recently.

TonyA · May 10, 2021

I just got word from the Dyno shop that they have me scheduled for the last two weeks in June !

Clive · May 11, 2021

TonyA said:
I just got word from the Dyno shop that they have me scheduled for the last two weeks in June !

Must be a global thing? Dyno shops and hairdressers - other than odd slots in the evening they are booked up for weeks here.

While my dyno shop does some research I bought the next size up injectors which are supposed to be a reasonable step up over stock, except I took a gamble and bought some cheap copies - £23 for4!!! I'll see if I can set up a test rig to check real flow rate and pattern. If they are anything like what they are supposed to be and improve my a/f I'll buy Bosch ones.

Figures vary a bit from one site to another but;
stock 0208 155 931 - 258cc/min
current 0208 155 831 - 315cc/min
new 0208 155 968 - 415cc/min

ntst8 · May 11, 2021

I'll be interested in how the bigger injectors go.
When i bought my Bosch ones they were labelled for a 6.0 litre V8, so 750cc a cylinder and probably a similar red line to the 961. They should have capacity in reserve in that case?

Clive · May 11, 2021

ntst8 said:
I'll be interested in how the bigger injectors go.
When i bought my Bosch ones they were labelled for a 6.0 litre V8, so 750cc a cylinder and probably a similar red line to the 961. They should have capacity in reserve in that case?

Yup my first upgrade was a bit conservative so we'll see. Just a bit worried about how accurate they will be - hoping that as this is a popular upgrade the low cost is just from economies of scale and not poor quality manufacturing which is why I'm looking at a test rig. Something to push onto the top - maybe a s/h bar with regulator and a s/h fuel pump. Then a measuring beaker and a fire extinguisher!

Vernon240 · May 12, 2021

TonyA said:
I just got word from the Dyno shop that they have me scheduled for the last two weeks in June !

What? Did you not play the 'don't you know who I am?' card?

Vernon240 · May 12, 2021

Clive said:
Yup my first upgrade was a bit conservative so we'll see. Just a bit worried about how accurate they will be - hoping that as this is a popular upgrade the low cost is just from economies of scale and not poor quality manufacturing which is why I'm looking at a test rig. Something to push onto the top - maybe a s/h bar with regulator and a s/h fuel pump. Then a measuring beaker and a fire extinguisher!

Not sure you'll find a norton rail, but I'd be looking at getting something like this:

Pardon our interruption...

www.ebay.co.uk

but something with a regulator attached would be handy!

You need to be sure that the injector 'o' rings will fit inside the injector pockets, but you'll also need some way of retaining the injectors. Sometimes it's clips..I'll have to take a look at mine...but more likely, the fuel rail is held solidly in place, against the throttle body with the injector trapped between them..if that makes sense. You'll also need a spare injector connector...I might have one. Then all you need is a 12v power supply. Typically you apply 12v to one side of the connector and the ECU grounds the other side when it wants to fire the injector. The complicated bit will be maintaining consistent pressure at the injector....I'd look at a bypass regulator...so it would bleed excess pressure back to your fuel reservoir. I think it's all doable though!...oh and you'll need a stop watch and switch to time how long the injector is open for!

Clive · May 13, 2021

Vernon240 said:
!...oh and you'll need a stop watch and switch to time how long the injector is open for!

Hmm couldn't find anything at a decent price immediately so might just fabricate a little jig with my compressor pressurising a container of petrol at 3 bar. Just about to buy an oil catch tank for the car like I fitted to the Norton so could borrow that.

Vernon240 · May 13, 2021

Clive said:
Hmm couldn't find anything at a decent price immediately so might just fabricate a little jig with my compressor pressurising a container of petrol at 3 bar. Just about to buy an oil catch tank for the car like I fitted to the Norton so could borrow that.

Yea, there wasn’t much on eBay at a reasonable price. If you can keep the pressure at the injector constant, that’s all you need!

iwilson · Jul 29, 2021

TonyA said:
I just got word from the Dyno shop that they have me scheduled for the last two weeks in June !

How did you get on Tony? @Clive how is the injector project working for you?

Clive · Jul 29, 2021

Hi - all running good. A pleasant little midrange lift in torque and power. As Tony implied there might be a little bit of lumpiness at the bottom end but certainly no starting problems. Could mess around to slightly rich it up a bit more but satisfied at present. At first was aware there's a bit more induction noise so I think I would struggle a bit to get it through on the track but I am pleased with the appearance. Gives it a bit of a Domi look and a number of people have said it suits it better.

TonyA · Jul 29, 2021

iwilson said:
How did you get on Tony? @Clive how is the injector project working for you?

Yes everything is running good , but I have made no more progress. I am still waiting for dyno time , if you can believe it ! Where its at now , I have the DynoJet PCV installed but no map loaded to it. There has been an improvement in my view with the inlet upgrade , so no question HP is up . The beauty of all this is once I have a map developed , any 961 with the inlet upgrade and a DynoJet #12-009 (BMW F800) PCV can use it (within reason understanding I started from Race Cans Map Delta 400) . Also , I am satisfied with the final setup of crankcase breather , air box temp sensor and tire spray issues . Meaning , I could leave it all like this permanently and use the motorcycle normally long trips and rain as well .

Inlet upgrade?

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