Author Topic: New member here with my slightly modified Continental GT 535  (Read 10371 times)

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Taurim

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Hi guys,

I'm new in this forum and I did not find a dedicated subject to post a first presentation message. So I will start here with a presentation of my "slightly modified" 535 GT  :)
I own it since  May 2020. This is not my only bike (I also own a Monster 1100s) but fell in love with the look of this retro new bike.
I bought it specifically to modify it to my taste and also as a past time during confinement days here in France  ::) And I had a lot of time to do that so there is a huge number of modifications  :D
The base is a 2017 Euro 4 model.

Some pictures will be more useful than a long boring text. You will probably guess what I am doing  ;)

This is the July version of my 535 :












And what I removed from the bike at that time ;D



This summer I did a few thousands kilometers. It was great fun but I'm still searching for an engine with more character.

With the new confinement this winter it's time to work on that  :)

Some before / after pictures :

Intake :




Exhaust :




Combustion chamber :





1.15 mm less height on the cylinder to have 1 mm squish band and a better CR :



As I don't have yet H's performance cam, did Mr Henshaw's trick to the intake camshaft :



And the mandatory Carberry plate :



Reassembly with a modified exhaust tube built from H's Inox exhaust pipe :



And the interesting detail welded on the tube behind the brake pedal  ;)



I used a cheap endoscope to check and adjust intake tract alignment :



It's alive and (not !) clicking  :) Work remain to be done on the ECU.



That's a lot of wires to install under the seat !



Done ! I added a switch to the right handle bar to command some feature on the PC5 (at the moment : Autotune On/Off)



Compression ratio looks good  :)
(not sure if the reading is correct, CR looks suspiciously high given what I have done to the cylinder. I thought it would be 9.3 bars and it is a little more than 10.5 bars...)



Time to ride the thing to check everything is OK (it was 4 days ago)... Yes it's good to ride again ! And the GT is pulling better than before  :)



After the short run, check the spark plug which shows a nice color (not too visible on this picture).



PC5 is starting to generate the Trims from the Autotune/Wideband sensor. It's a really clever thing  :)
I started with some conservative target AFR (13.6 to 13.2).



What remains to be done :
- I just received my ACE.derottone airbox kit (Yes I was reading this forum long before today  ;)). The idea is really great :) But I will probably install a different velocity stack as the one I received is different from 2016 model.
- I think I have found a Performance cam kit in a French RE forum  :D
- riding the bike to set up a good PC5 map.

That was a long first post  ;)


gizzo

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Reply #1 on: December 24, 2020, 05:06:44 am
Welcome aboard! Great choice of bike. 8)
simon from south Australia
Continental GT
Pantah
Monster
DR250
DRZ400SM


AzCal Retred

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Reply #2 on: December 24, 2020, 07:15:11 am
Nice work on that combustion chamber! No roughness left to initiate hot spot pre-ignition.  :)
Love those fine wire plugs too. Looks like a real runner! - ACR -
A brace of 1999 Bullets: 1 Red Deluxe, 1 Green Standard. Also, 1 wee orphan 1956 Fire Arrow project.


ace.cafe

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Reply #3 on: December 24, 2020, 12:03:08 pm
Nice!

What is the difference about the 2017 model that makes our velocity stack unsuitable?
We need any info on model changes to keep our kits updated.
Home of the Fireball 535 !


Taurim

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Reply #4 on: December 24, 2020, 12:49:39 pm
Thanks for your messages  ;)

The velocity stack in the kit is not unsuitable. It is less perfect than the one I saw in messages from Otto_Ing :


https://forum.classicmotorworks.com/index.php?topic=22756.345

The one from the kit, made of steel, is on the right. It's a bit short to have the correct length for 4500 to 5000 rpm. Length is 115 mm, 65 mm in the airbox if completely inserted (did not do it yet as I have to drill a hole in it for the temperature sensor which is in the rubber hose on Euro 4 models).
And also no roll back for the radius at the bell mouth which is not perfect. But I agree it will probably make no noticeable difference  ;)



On the left is a 45x90mm Jenvey air horn for a Weber carburetor. The shape and the length are perfect and it is very light. It can be fitted in the airbox.
But I think the huge size of the bell mouth (88mm) and the length place the mouth too close from the rear of the airbox to have a good airflow.
So I will probably not use it and start with the velocity stack provided with the kit  ;)

Except if it's possible to find the one used by Otto_Ing ?

Merry Christmas Eve  :)


derottone

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Reply #5 on: December 24, 2020, 01:31:15 pm
I have one aluminium around that hasn't been used yet. PM your address and I ship it.

Nice job on your bike.
"Proles and Animals are free"
"Ignorance is strength"


Taurim

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Reply #6 on: December 24, 2020, 01:53:48 pm
Christmas is supposed to happen tomorrow  ;D

Thanks a lot derottone, PM sent  ;)


gizzo

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Reply #7 on: December 24, 2020, 02:00:18 pm
It was Christmas half an hour ago here. Good onya Otto. Happy Christmas .
simon from south Australia
Continental GT
Pantah
Monster
DR250
DRZ400SM


derottone

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Reply #8 on: December 24, 2020, 03:51:05 pm
It was Christmas half an hour ago here. Good onya Otto. Happy Christmas .

....you know I don't believe in Xmas. ;)
"Proles and Animals are free"
"Ignorance is strength"


gizzo

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Reply #9 on: December 24, 2020, 07:28:47 pm
....you know I don't believe in Xmas. ;)
Nevertheless, it's a real thing. Some people even take it seriously  ;)
simon from south Australia
Continental GT
Pantah
Monster
DR250
DRZ400SM


Guaire

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Reply #10 on: December 25, 2020, 12:17:06 am
If you can, give each stack a try on the old butt dyno. See if there’s a discernible difference. I’d love to hear a comparison.
  It shouldn’t be difficult, easy in and out through the filter and the air box.
Cheers,
Bill G.
ACE Motors - sales & administration


gizzo

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Reply #11 on: December 25, 2020, 03:04:23 am
....you know I don't believe in Xmas. ;)

Wow what a day. So good. T shirt weather and no wind plus family. Happy days
simon from south Australia
Continental GT
Pantah
Monster
DR250
DRZ400SM


derottone

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Reply #12 on: December 25, 2020, 08:56:07 am
Wow what a day. So good. T shirt weather and no wind plus family. Happy days

What, didn't the aussie commies already outlaw it? I guess they did, except for themselves.
« Last Edit: December 25, 2020, 09:02:41 am by derottone »
"Proles and Animals are free"
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ace.cafe

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Reply #13 on: December 25, 2020, 12:12:18 pm
Regarding the rolled entry shape of the stack, studies have found that there is less than 5% difference in actual flow berween a flat cutoff and a full 180° rolled entry. So I wouldn't worry too much about that.

Regarding the length, on my GT, the friction fit into the airbox connector allowed me to position the stack with adjustable length.
Home of the Fireball 535 !


Taurim

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Reply #14 on: December 25, 2020, 05:56:44 pm
If you can, give each stack a try on the old butt dyno. See if there’s a discernible difference. I’d love to hear a comparison.
  It shouldn’t be difficult, easy in and out through the filter and the air box.
Cheers,
Bill G.

I will try that but installation was not that simple.

On Euro 4 machines you have the air temperature sensor in the way :



You can see the sensor and the plug in the middle of the picture :




One solution could have been to drill a hole in the velocity stack for the sensor. But to change the stack it requires to remove the tank, remove the sensor, etc...

If I insert the stack up to the sensor, it does not stay in place and I was not too happy with the huge gap between the stack and the throttle body.


So after some sawing/drilling/sanding/swearing I came up with this solution : a ring to limit the size of the gap and protect the sensor.



In place :



I use some tape on the velocity stack to make it fit as snugly as possible in the airbox :



When in place there is  a small step on top between the stack and the ring but it extremely small.



With this installation, the stack length in the airbox is 80mm, that's 15mm longer than when in contact with throttle body.



Job done  :)