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Author Topic: New MeXXspeed mill V3  (Read 5693 times)
Prowagen
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« Reply #90 on: April 06, 2021, 17:02:38 pm »

This engine build and the technology you are putting into it is phenomenal! Like many others I am blown away!

A couple of questions from a real novice; but with the injectors so high is there not an high risk of fire outside of the cylinder? Also is machining what you do for a living?

Regards,
Rob.
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MeXX
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World record holder 8.733 @ 255.658


« Reply #91 on: April 07, 2021, 08:51:38 am »

This engine build and the technology you are putting into it is phenomenal! Like many others I am blown away!

A couple of questions from a real novice; but with the injectors so high is there not an high risk of fire outside of the cylinder? Also is machining what you do for a living?

Regards,
Rob.

Dear Rob...

No & No....

If there is a back fire it will exit the manifolds anyway doesn't matter where the fuel injectors are located.... as long as the engine keeps on running its not a big problem as the injected fuel mixed with the air will not keep on burning... as soon as the engine stops running there is no fuel anymore.... In my opinion it is more dangerous to have fuel filters that soak up the fuel spit back through reversion.... and might keep on burning......
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MeXX
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« Reply #92 on: April 07, 2021, 09:23:01 am »

The V3.0 was basically the prototype based on the development of the V2.X series.... which was improved  spep by step together with one of the most experienced induction system designer... Darin Morgan....

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« Last Edit: April 07, 2021, 13:44:43 pm by MeXX » Logged

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MeXX
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« Reply #93 on: April 07, 2021, 09:36:24 am »

Step by step.... port modifications did not only improve the CFM numbers... even more important was to see more and more even airspeed distribution across the CSA.... using a pitot tube....


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« Last Edit: April 07, 2021, 10:06:01 am by MeXX » Logged

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MeXX
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« Reply #94 on: April 08, 2021, 12:03:16 pm »

Using a wet flow bench is quite interesting.... but not very useful without experienced people how can interpret the results.... After according port modifications including removing the bespoke vane step by step theflow increased....from the low lift (3.8CFM) to high lift (27.7CFM) region....
To get the best over all performance.... we tried to get the best off the seat and low lift flow and than rework the bowl and increase the CSA slightly to get the high lift flow without sacrificing the low lift numbers.....
Check out the second pix to see the benefit for all the countless hours of labor on the bench....
To be honest I'm very proud to work together with one of the gear heads in head design...
And reaching this for me unbelievable numbers... giving me the opportunity to built an unlimited NA engine....


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« Last Edit: April 09, 2021, 06:54:42 am by MeXX » Logged

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Frallan
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« Reply #95 on: April 08, 2021, 15:02:12 pm »

OK, I have a comment again: THANKS!!!
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MeXX
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« Reply #96 on: April 08, 2021, 19:55:24 pm »

As soon as the head development was finished.... it was up to design the manifolds with the throttle bodies....
The tuned manifold length was set to 300mm (form the valve seat to the lip of the velocity stack) with the possibility to be shortened up to 25mm to be able to tune it on the dyno for best over all performance...
as the port is 90mm and the stack was set to 80mm (80mm -25mm =65mm (shortest possible stack)) the manifold including the throttle body ended up with a length of 130mm...
which is quite short.... so the decision was done to angle the throttle plates about 12 (see 2nd pix) to get a nice radius and therefore a nice flowpath with airspeed acceleration from the lip of the stack to the valve seat...
without having the necessity of going from left to right side radius....

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« Last Edit: April 09, 2021, 07:23:26 am by MeXX » Logged

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MeXX
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« Reply #97 on: April 11, 2021, 07:02:17 am »

The first two pix show nicely the radius of the whole induction system that tightens up towards the valve seat
The downside of the angled throttle plates is the angle between the center line of the shafts....
The levelers are designed to compensate the twisting tue engagement... the nice side effect is the the twisting acts like the return spring... see pix 3 and 4....

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« Last Edit: April 11, 2021, 07:19:27 am by MeXX » Logged

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MeXX
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« Reply #98 on: April 11, 2021, 08:00:24 am »



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dannyboy
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« Reply #99 on: April 11, 2021, 22:26:30 pm »

epic work on all levels  Shocked  Cool keep at it
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9.85 @ 137mph in the wall....
O/FF 60
......
MeXX
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« Reply #100 on: April 12, 2021, 12:28:12 pm »



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MeXX
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« Reply #101 on: April 12, 2021, 12:33:24 pm »



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MeXX
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« Reply #102 on: April 12, 2021, 12:36:19 pm »



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MeXX
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« Reply #103 on: April 13, 2021, 10:41:09 am »


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MeXX
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« Reply #104 on: April 13, 2021, 19:45:34 pm »


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Abadco2
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« Reply #105 on: April 13, 2021, 20:29:45 pm »

MeXX,  I was at EBI in 2019 and was privileged to see in person and talk with you as you explained in detail just some of the ultra special one offs of this most advanced vehicle.
The two things that I have focused on is, 1. the butterfly throttle returns shown here and 2. the fact that you have not taken out and have support for the valve seats.  I think this is overlooked in today's off the shelf performance heads, IMO.
I look forward to more of your postings.
Art A.
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MeXX
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« Reply #106 on: April 13, 2021, 20:54:39 pm »

MeXX,  I was at EBI in 2019 and was privileged to see in person and talk with you as you explained in detail just some of the ultra special one offs of this most advanced vehicle.
The two things that I have focused on is, 1. the butterfly throttle returns shown here and 2. the fact that you have not taken out and have support for the valve seats.  I think this is overlooked in today's off the shelf performance heads, IMO.
I look forward to more of your postings.
Art A.

Hey Art....
 great to hear from you... and thx for your words of honor.... I really appreciate that....
I didn't really get your 2. point.... about the valve seats.... ?.

MeXX
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MeXX
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« Reply #107 on: April 14, 2021, 14:39:19 pm »

Here come some pix of the super tricky throttle stops made out of billet TiA6V4.....

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MeXX
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« Reply #108 on: April 14, 2021, 14:43:23 pm »

The machining to fit the throttle stops was done by hand by some quite tricky self made tooling....

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Abadco2
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« Reply #109 on: April 14, 2021, 19:34:57 pm »

My valve guide point, is the after market guys cut away so much of the head material that supports the intake valve guide, subject to failure.
Art A.
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MeXX
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« Reply #110 on: April 14, 2021, 20:04:36 pm »

My valve guide point, is the after market guys cut away so much of the head material that supports the intake valve guide, subject to failure.
Art A.

Dear Art...

absolutely...

It us not only having enough support for the valve guide... it is the combination of quite long valves (5.480") to get a gentle radius....in quite long valve guides (2.650") for a precise support.... and a rigid support in the head....
This is one of the backbone of a stable valve train....

MeXX
« Last Edit: April 14, 2021, 20:07:32 pm by MeXX » Logged

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MeXX
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« Reply #111 on: April 14, 2021, 21:28:21 pm »


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