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Leif Nyström
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« Reply #120 on: April 22, 2021, 14:55:42 pm » |
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Outstanding development and commitment MeXX.
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« Last Edit: April 23, 2021, 06:23:16 am by Leif Nyström »
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MeXX
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« Reply #121 on: April 22, 2021, 15:12:40 pm » |
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Outstanding development and commitment Mex.
Thx MeXX |
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« Last Edit: April 22, 2021, 15:15:27 pm by MeXX »
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Drag or Die
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MeXX
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« Reply #122 on: April 22, 2021, 18:38:37 pm » |
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As mentioned before the engine started with the fuel injectors very low squirting directly on the upper side of the intake valve...
With the longest possible velocity stack possible.... being shorted step by step on the first dyno session to find the best combo...
Starting with a total length if the whole induction system of 300mm for a calculated RPM of 8500...
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« Last Edit: April 22, 2021, 18:56:07 pm by MeXX »
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Drag or Die
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MeXX
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« Reply #123 on: April 22, 2021, 19:07:04 pm » |
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Still with the long trumpets... the induction system was on the wet flow bench to optimize the location of the upcoming stand off injectors....
The right angle sould ensure to keep the fuel as long as possible in the air to optimize atomization.... for sure all on over 400 CFM...
WOT a sound...
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Drag or Die
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MeXX
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« Reply #124 on: April 22, 2021, 19:13:23 pm » |
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After the first dyno session the final length of the induction system was set to 275mm...
At that length the power maxed out at 9150 RPM
BTW... to give the trumpets a nice shape a new form and new carbon fiber trumpets were done to replace the just shorted long version....
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« Last Edit: April 22, 2021, 19:17:27 pm by MeXX »
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Drag or Die
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MeXX
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« Reply #125 on: April 25, 2021, 15:55:24 pm » |
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All the hardware for the stand off and fuel rail was machined out of titanium and welded together.....
Great care was taken to keep the location and angle of the injector so that the fuel doesn't touch the throttle plate and downstream the manifold without touching the walls....
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« Last Edit: April 25, 2021, 19:52:03 pm by MeXX »
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Drag or Die
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MeXX
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« Reply #126 on: April 25, 2021, 16:04:49 pm » |
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The center of the fuel rail, where the fuel enters, is the location of a fuel damper.... which limits the pressure fluctuations....
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« Last Edit: April 25, 2021, 19:55:58 pm by MeXX »
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Drag or Die
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ibg
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« Reply #127 on: April 26, 2021, 00:28:31 am » |
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beautiful work. I had a couple of questions:
Are there standard diaphragms and springs to make the dampers from, or are they adapted from something else?
Are the Ti legs braised on or welded on? looks a bit like gas welding?
well more than a couple.....
Would there be any advantage to a slide or roller body throttle rather than butterflies? there would be a weight and complexity trade off. I'm thinking of the issues in trying to spray past the butterfly.
thank you for the fantastic pictures and descriptions.
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MeXX
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« Reply #128 on: April 26, 2021, 06:53:54 am » |
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beautiful work. I had a couple of questions:
Are there standard diaphragms and springs to make the dampers from, or are they adapted from something else?
Are the Ti legs braised on or welded on? looks a bit like gas welding?
well more than a couple.....
Would there be any advantage to a slide or roller body throttle rather than butterflies? there would be a weight and complexity trade off. I'm thinking of the issues in trying to spray past the butterfly.
thank you for the fantastic pictures and descriptions.
Hi Ian.... Hope everything is going well down under..... I really appreciate questions, as it is hard to point out everything and I would miss a lot details .... Diaphragm is aftermarket holley style Carburetor Diaphragm PART# 135-10.... just cut on the outside.... spring is just according weight to keep the diaphragm in the middle at fuel pressure of 50 psi.... Legs are Tig welded in just high Amps without filler rod.... that why it looks like gas welding.... According the throttle style, it is a trade off anyway.... but there are a few additional considerations I wanna share... For sure slider and barrel shape do have a flow advantage without a doubt.... but I run open trumpets and stand off injectors so on part throttle the slider or barrels will be wet all the time.... tending that dust will stick on it.... and there is a very high risk that they get stuck... much easier with rotary throttle plates, where you can use sealed roller bearings.... very reliable, and of the shelf.... As the diameter is 65mm the slider and barrels would get quite big and bulky... and therefore additional weight... Keeping in mind the manifolds will be very short (120mm) fitting a quit big barrel with a diameter of 100mm or even more would be quite tricky.... So the decision was done to keep the traditional throttle plate design.... As the centerlines of the butterflies are not in line the leveler design was a little bit more tricky to overcome the misalignment... To reduce the flow restriction of the butterfly which is located in the center of the flowpath, this section was designed like a bowl to cope the missing CSA... a really nice side effect of that design is to get a real good throttle response just for the first few % of opening, as the change in CSA is more progressive.... |
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« Last Edit: April 26, 2021, 18:52:55 pm by MeXX »
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karl h
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« Reply #129 on: April 26, 2021, 06:55:54 am » |
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morgen
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ibg
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« Reply #130 on: April 27, 2021, 10:34:35 am » |
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thanks Mexx good food for though in your answers. We are very lucky in OZ, no cases of community transmission, a fair bit of motor racing is going on and life is pretty normal..... we just can't travel  |
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Eddie DVK
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« Reply #131 on: April 28, 2021, 06:39:24 am » |
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Man I really love those stand off injectors, gives me that good feeling like formule one engines back in the days.
Your engine is out of this world.. Respect..
The Peter Shattock small engine has the stand off injectors and the rotary throttle plates, which I also like.
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Regards Edgar
" Type 4, it is a completely different engine. You have to drive one to understand! "
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MeXX
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« Reply #132 on: April 30, 2021, 06:41:36 am » |
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Extensive wet flow bench time pays off when looking on the pistons after dyno time...
It is very clearly noticeable that the combustion chamber and the squish area work and the are no dead spots where carbon built up takes place...
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« Last Edit: May 01, 2021, 07:40:59 am by MeXX »
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brewsy
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« Reply #133 on: April 30, 2021, 13:25:32 pm » |
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Just WOW
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MeXX
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« Reply #134 on: May 01, 2021, 07:54:22 am » |
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Combustion chamber look even better....
I know most people might think that those chambers are looking' quite unorthodox...
But... that's the design we ended up... after development has been finished up... keeping in mind that there is a valve rotation and it was basically designed for nitrous use so we had to slow down the flame travel... to avoid detonation on high CR for high efficiency....
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« Last Edit: May 01, 2021, 15:17:43 pm by MeXX »
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Drag or Die
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MeXX
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« Reply #135 on: May 01, 2021, 09:07:31 am » |
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The valves used are Xceldyne, coated titanium..... intake is 7mm hollow stem....
Exhaust is 7mm full stem...
Check out the weight ...
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« Last Edit: May 01, 2021, 09:12:03 am by MeXX »
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Drag or Die
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wph
Jr. Member
Posts: 94
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« Reply #136 on: May 01, 2021, 19:13:33 pm » |
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Combustion chamber look even better....
I know most people might think that those chambers are looking' quite unorthodox...
But... that's the design we ended up... after development has been finished up... keeping in mind that there is a valve rotation and it was basically designed for nitrous use so we had to slow down the flame travel... to avoid detonation on high CR for high efficiency...
I'm not shure but it looks like you're running wedge shaped squish area on your heads due to power adder ? Less knock sensitivity and wider tuning window... Pekka |
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MeXX
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« Reply #137 on: May 01, 2021, 21:24:54 pm » |
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Combustion chamber look even better....
I know most people might think that those chambers are looking' quite unorthodox...
But... that's the design we ended up... after development has been finished up... keeping in mind that there is a valve rotation and it was basically designed for nitrous use so we had to slow down the flame travel... to avoid detonation on high CR for high efficiency...
I'm not shure but it looks like you're running wedge shaped squish area on your heads due to power adder ? Less knock sensitivity and wider tuning window... Pekka Yep..... Squish area is wedged down by 5°.... very helpful detail... especially on nitrous.... 3° for NA, 5° to 7° on nitrous.... 7° to 12° on high boost applications.... Check out the pix... on the outside there is a 6mm wide ring that is not wedged blended with a radius into the 5° area... [ Attachment: You are not allowed to view attachments ] MeXX |
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« Last Edit: May 01, 2021, 21:41:34 pm by MeXX »
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Drag or Die
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wolfswest
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« Reply #138 on: May 05, 2021, 11:07:20 am » |
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just WOW! insane craftmanship, hats off to you sir!
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JPS NACIONAL kameraderie - HDB Syndicate.
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MeXX
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« Reply #139 on: May 05, 2021, 15:16:42 pm » |
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Two nice shots oh the intake port and the installed piston with the valve diving into valve notch....
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MeXX
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Drag or Die
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MeXX
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« Reply #140 on: May 06, 2021, 11:08:29 am » |
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During production the recess for the intake valve seat is machined first and the seat is pressed in.....
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« Last Edit: May 06, 2021, 12:05:00 pm by MeXX »
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Drag or Die
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MeXX
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« Reply #141 on: May 06, 2021, 12:13:00 pm » |
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The recess for the exhaust valve seat is machined afterwards and interferes the intake....
the installed exhaust seat is interlocking the intake....
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« Last Edit: May 06, 2021, 12:16:04 pm by MeXX »
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MeXX
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« Reply #142 on: May 07, 2021, 07:58:36 am » |
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more pix from the production....
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Drag or Die
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MeXX
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« Reply #143 on: May 07, 2021, 08:03:01 am » |
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and the finished camber and ports....
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bedjo78
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« Reply #144 on: May 10, 2021, 08:35:14 am » |
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Amazingg
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Frallan
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« Reply #145 on: May 10, 2021, 10:26:55 am » |
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To see that kind of detail and to read and see the depth of what you do, I have only to compare to RET (Race Engine Technology).
I have seen your articles and a couple of updates in that magazine and it is very nice. Now, this is clearly much more than a magazine article.
Appreciate it so much!
Wish more racers would "Dare to Share!".
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MeXX
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« Reply #146 on: May 13, 2021, 07:48:56 am » |
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Special care was taken setting up the valve seat angles.... as this is a super critical area....
The valve spring install height was set up by the according height of the spring locators made out of Beryllium bronce...
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« Last Edit: May 13, 2021, 08:14:08 am by MeXX »
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Drag or Die
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Chip
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« Reply #147 on: May 16, 2021, 14:07:35 pm » |
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Love this!
I've noticed that the rocker stands are setup two ways, is that because there is a left and right head? Or are you testing 2 different setups?
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MeXX
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« Reply #148 on: May 16, 2021, 21:45:04 pm » |
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Love this!
I've noticed that the rocker stands are setup two ways, is that because there is a left and right head? Or are you testing 2 different setups?
That's just to get the pushrod set up as straight as possible.. OEM left and right side rockers have the same offset... and both side pushrods are angled.... To correct the left side is quite easy... no offset no angle.... Right side would need double offset to get straight pushrods... or like I prefer rotated rockers.... Left side... the easy one.. [ Attachment: You are not allowed to view attachments ] Right side... the rotated one.... [ Attachment: You are not allowed to view attachments ] [ Attachment: You are not allowed to view attachments ] |
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« Last Edit: May 21, 2021, 06:47:05 am by MeXX »
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Drag or Die
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MeXX
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« Reply #149 on: May 20, 2021, 10:14:47 am » |
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Some pix of the engine assembly....
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The Cal-look Lounge
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