The 4" Bore Thread

[MeXX]

some more pix

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MeXX

[MeXX]

Hi MeXX,

I could continue because of your parts, so thanks alot for your help!
The pistons are still in the USA at a friend of Mine who will bring them to Germany in his luggage when he will be on a business trip by the end of january. I will send some pics as soon as I have them here.
The TP dry sump pump usually has 26mm pressure and 38mm scavange gears but mine will be modified for 30mm pressure gears because I plan to install oil squirters as well and I'm afraid that the 26mm gears wouldn't be enough.
My dry sump system will be plumbed the same as yours but I will try to use the stock oil filter location with a short filter....maybe that will clear the header?!

BTW: your (machine) work is great and really very inspiring to me! It seems that you have a lot of experience in building 4" engines. Which engine case (WBX or Autolinea) do you prefer and why?

Tobi

Hi Tobi

Your dry sump pump gears will be perfect it's just the same I ended up with my 3rd pump:
1. CB  26mm 21mm too small at all.
2. Home built 32mm 26mm to small for squirters
3. Home built 38mm 30mm ok for squirters but I 32mm would even be better as alot of the engine cooling will be done
    by the oil and the oil cooler.

For street use be sure to have a real big oil cooler with a sufficient duct, U will see that U need it.
Last but not least your dry sump tank should contain at minimum 5l oil.(6-7 is better).

In my opinion the WBX case in much better but a lot more work to do and because of the lack of the possibility to use an oil sump u have to run dry sump.

So WBX is the technical better way to go 4 inch
but Autolinea ist the easier and more econony way.

So long  MeXX

[Andy Sykes]

You guys have some talent    love it

[andy198712]

I've wondered about my drysump pump and squirters but seeing this I'm happy, mine is the bugpack with 60mm suction and 30mm pressure.

What's the merits of using a 1mm hole drilled vs porsche items?

All the best

Andy

[MeXX]

I've wondered about my drysump pump and squirters but seeing this I'm happy, mine is the bugpack with 60mm suction and 30mm pressure.

What's the merits of using a 1mm hole drilled vs porsche items?

All the best

Andy

Dear Andy

I prefer the porsche ones because they have a built in valve that opens at 3 bar pressure to help you to have a higher oil pressure at low RPM (below 3 bar).

MeXX

[dangerous]

Hi

Some pix of my kind of valvetrain:

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check out the straight push rods

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left side

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right side

MeXX

I am interested in how you have angled the pivot points on the right side.
How did you match the sweep to the valve angle once the pedistals are angled?
Are your custom made 4340 pedistals on an angle at the base too?

So nice to see how others approach things with a fresh viewpoint! Nice work!

[Tobi/DFL]

I was thinking about these (#44-970):

http://www.bingpower.de/wp-content/uploads/2012/05/oesd_vergleichstabelle.pdf

The valve opens/closes at 2.0 bar oilpressure.

Tobi

[Shag55]

That is great work MeXX!  I'm working on my Autocraft heads now and was looking to improve the rocker design. Did you weld up all the original rocker stud holes?

[MeXX]

I am interested in how you have angled the pivot points on the right side.
How did you match the sweep to the valve angle once the pedistals are angled?
Are your custom made 4340 pedistals on an angle at the base too?

So nice to see how others approach things with a fresh viewpoint! Nice work!

Dear Dave

Year it's really great to have the possibility to share our ideas and the way to go a very short time very fast. (sounds insane  ).

As I'm not 100% sure what you wanted to ask I try to answer what I think you interested in, but feel free to ask again.

The left side is the easier part: As I realized that the pushrods are angled in one side and the rockers angled back again I
was thinking of making the pushrods straight, which makes really sens in my mind. To keep it easier I ended up with straight rockers (in line) and nearly straight pushrods (distance Ex-Ex valve is slightly bigger than the lifters).

The right side was a little more tricky: First mock up was very rudimentary, I just took some welding rods bent them 90° and tried to connect the valve tips with the lifters trying to keep them ASAP (as straight as possible  ). As there were no pushrod holes in the heads at this time the welding rods looked more than a ? first. As I realized that there is a way there has to be a hole (first a small one) now the first welding rod (which was still waiting for action) was used. Than I did a lot of measuring calculating and some drawings and ended like it is now: The 4 rockers have 4 different angles, but the pushrods are ASAP.

The petestal stands are perpendicular but the casted base and the threats are angled 9° like the valves so if I shim the height the contact point doesn't move (except of the geometric change).

Does this answer your Q

MeXX


 

[MeXX]

I was thinking about these (#44-970):

http://www.bingpower.de/wp-content/uploads/2012/05/oesd_vergleichstabelle.pdf

The valve opens/closes at 2.0 bar oilpressure.

Tobi

Hi Tobi

The list is really great 
Is there a possibility to buy them from Bing ?

That's what I used till now

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MeXX

[MeXX]

That is great work MeXX!  I'm working on my Autocraft heads now and was looking to improve the rocker design. Did you weld up all the original rocker stud holes?

Dear shag

Thanx to Mike from Autocraft I got my heads wo stud holes and wo pushrod holes.
There was a little bit welding required on the right side head because of the angled rockers as
there was to less material for the stud holes.

MeXX

[dangerous]

I am interested in how you have angled the pivot points on the right side.
How did you match the sweep to the valve angle once the pedistals are angled?
Are your custom made 4340 pedistals on an angle at the base too?

So nice to see how others approach things with a fresh viewpoint! Nice work!

The petestal stands are perpendicular but the casted base and the threats are angled 9° like the valves so if shim the height the contact point doesn't move (except of the geometric change).

Does this answer your Q

MeXX


 

Thank you MeXX, the above statement was what I was asking , thank you.

The Component Development Brand heads also straighten the pushrods,
but use an offset rocker on the RHS. (see my picture below)
Once you get the rocker shaft square with the 9 degree valve stem, like you have done, you can use the nice straight rocker arm.
Thank you for the explanation.
Dave.

[dangerous]

PS, the rockers above are my own make, but the heads are the Component Develpment castings.(4.03" bore)

[MeXX]

PS, the rockers above are my own make, but the heads are the Component Develpment castings.(4.03" bore)

PS, my rockers are Jesel MoHawk,CD heads are better because there is more room 1st Ex rocker mine are (4.04" bore)  

BTW my new design rockers are coming up soon ......

was inspired by:
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MeXX

[Shag55]

Thanks MeXX!
So you 1st welded the rocker stand area to fill in the two holes and the offset areas then machined the whole boss at 9* and drilled and tapped your stud holes also at 9*?
The 3-4 intake and exhaust rockers all have different angles from the valve centerline?
Btw the Jessel pro steel rockers are the best, no fatigue life problems.

[MeXX]

Thanks MeXX!
So you 1st welded the rocker stand area to fill in the two holes and the offset areas then machined the whole boss at 9* and drilled and tapped your stud holes also at 9*?
The 3-4 intake and exhaust rockers all have different angles from the valve centerline?
Btw the Jessel pro steel rockers are the best, no fatigue life problems.

Dear Shag

I got my heads without any stud holes. Yes it was first welded and than machined to the 9° valve angle as this is the only possibility to angle the rockers for the 1-2 side. All threats are also 9° this makes it possible to shim it to the right geometry, necessary when for examble the valve or spring length is changed. I prefere stands in the right height without shims.

MeXX

[MeXX]

Hi

Todays special :

How to plug 4 inch

The Piston

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MeXX

[MeXX]

First Piston

Porsche 993 GT2 Biturbo:

Hi quality graphal coated Piston for nikasil cylinders diameter 100mm best for street limited to horsepower of about 400 HP.
23mm wrist pin requires repushing the rods.

[MeXX]

the second

The Venolia 4.00 inch piston traditional design very rigid and forgiving perfect for turbo or nitrous (up to 250HP).
Notice the inside window mill to reduce the weight a little bit.

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[MeXX]

the third

CP custom piston x box design for 100mm nikasil compression height 1.06 22mm piston pin and only 373 g. Combined with Porsche 100mm cylinders perfect for street.

[MeXX]

the forth

CP custom piston x box design 4.040 inch  compression height 1.06 22mm piston pin and only 415 g (window mill to reduce the weight) designed to survive 500 HP.

[Shag55]

Dear Shag

I got my heads without any stud holes. Yes it was first welded and than machined to the 9° valve angle as this is the only possibility to angle the rockers for the 1-2 side. All threats are also 9° this makes it possible to shim it to the right geometry, necessary when for examble the valve or spring length is changed. I prefere stands in the right height without shims.

MeXX
[/quote]
I see! Only the 1-2 head with angled rockers is machined 9*
Very nice work can't wait to see your new design as well as your clutch set up when done.

[MeXX]

the fifth

last but definitely not least
Yates racing custom CP piston 4.062 compression height 1.16 22mm piston pin and only 412g with window mill it will be below
400g  

[MeXX]

I see! Only the 1-2 head with angled rockers is machined 9*
Very nice work can't wait to see your new design as well as your clutch set up when done.

Dear Shag

No both are milled to 9°

MeXX

[andy198712]

I've wondered about my drysump pump and squirters but seeing this I'm happy, mine is the bugpack with 60mm suction and 30mm pressure.

What's the merits of using a 1mm hole drilled vs porsche items?

All the best

Andy

Dear Andy

I prefer the porsche ones because they have a built in valve that opens at 3 bar pressure to help you to have a higher oil pressure at low RPM (below 3 bar).

MeXX

Thanks Mexx,

yeah like a ball check valve i think? seems about $25-33 each?

i can see the sense in them!

my KTM enduro bike seems like it uses a screw in jet?.... i'll find a picture



Cheers

[andy198712]

need to look into that and see if its just a hole or a check valve....

[58vw]

great pics mexx

[MeXX]

great pics mexx

THX Tim

What pistons do U prefer

MeXX

[Fiatdude]

J&E 4" == good to about 900HP

[andy198712]

moving up to heads, are there any other options out there that are street worthy other then:

Super Flows
Angle Flows
JPM's
?

IE anything my bank wont disown me over?