Donnerstag, 21. März 2013

JPS Venturis for Dellorto DRLA

I was unhappy with the shape and quality of the Dellorto DRLA Venturis
 so I began to produce my own Venturis


                                                        These are available in sizes:

                                                     Price / Each    SFr 21.- / € 17.-

           These venturis are made ​​from high quality aluminum and fits perfectly

                                                    Manufactured in Swiss Quality

JPS Utimate Racing Pushrods ready to ship

  A nice Set of JPS Ultimate Racing Pushrods
!max. Valvespring pressure 280kg!

 ! now its finished with the annoying rattle from the valvetrain!
Made to custom lenght and assembled ready to use

Samstag, 16. März 2013

JPS Ultimate Racing Aluminium Pushrods

This is how the JPS Ultimate Racing Pushrods look like before installation of the Manton Tips

The Pushrods are tappered on both sites
Deephole drilled from one site!

There is no gap or edge in the middle

The JPS Ultimate Racing Pushrods are made of a special aluminium material.
This material is used in engine areas on aircraft where the temperature often encountered up to 250°F (120°C)

This material does not lose strength when the temperature rise up to 250°F (120°C)

 7075 T6 Aluminium will lose 3 times more in strengh when its getting 300°F (150°C)
And the pushrods get in contact with the oil that go up to the heads and with the hot oil coming back from the heads!

 JPS Ulimate Racing Pushrods are only available cut to your lenght.
 I will do the installation of the tips (special proceed and tools are required)
So you only must give me the lenght you need!

This pushrods can handle up to 280kg spring pressure (but no serious engineer need that much)

It was not easy to do this photo
But you can see, perfect clean hole no gap or edge


Line up

Sonntag, 10. März 2013

Camshaft Gear Modification

For my HP street-engines I modify the camshaft gear as you can see below

I cut two approx. 2,5mm width an deep to the ground grooves in the cam gear.
This is to reduce the surface that is in contact and the oil can squish out easier.

Or you can put some marking ink on the cam gear and find out how much surface you need.
You can reduce it by nearly 40%
For HP street engines there is no reason to run straigthcut cam gears
To you need some examples?

This is the camdrive on the Porsche 910 race engine

This on a Carrera 6 engine

and this on a 3.0l RSR engine

All this engines turn up to more than 8000 rpm, producing more than 110 hp/l

The camshaft gear on this engines must drive the huge oilpump, 2 duplex chains for the camshaft that serve 12 valves with double valvesprings.

So I think this are good arguments to throw the noisy straight cut gear in the trash ;-)

Dienstag, 5. März 2013

Black Magic ready to run

Nice Layout

Typ IV Head rework

Heads for 412 LE machining