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My Express engine
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marcnr1
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PostPosted: Sat Apr 17, 2010 4:47 am    Post subject: Reply with quote

marcnr1 wrote:
Peter_Plade wrote:
The first run on the dyno was 44hp, after cahnging the venturies it was 46hp. And then we gawe it a litttle more timing.
But Im happy Smile never thought I would get over 50hp with it.


At what rpm did you het that horsepower?
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Sorry, I had to watch the movie before I did that last post!
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Peter_Plade
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PostPosted: Tue Oct 30, 2012 1:30 am    Post subject: Reply with quote

Well this was what happend this summer, after almost 30.000km with the Express motor the crank gave up.
The most crazy thing was that I actually was able to limp it the last 15km home with the broken crank.

The motor is now torn down and new plans have been made.
This time Im putting in a 72mm stroker crank, this should make it a 1341cc, kind of exited to see how this will work out.

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John Moxon Premium Member
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PostPosted: Tue Oct 30, 2012 1:59 am    Post subject: Reply with quote

How many is that now Peter?...I seem to remember you broke another one before. Wink
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Peter_Plade
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PostPosted: Tue Oct 30, 2012 2:19 am    Post subject: Reply with quote

John Moxon wrote:
How many is that now Peter?...I seem to remember you broke another one before. Wink


You have a good memory John Very Happy
Its true I also broke one back when I was running my Judson.

Apparently I rev my motors to high, I just cant control myself Rolling Eyes
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J
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PostPosted: Sat Nov 03, 2012 2:48 am    Post subject: Reply with quote

Join the club-)
mine broke after 12000km.
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grueni
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PostPosted: Sat Nov 03, 2012 2:59 am    Post subject: Reply with quote

they allways brake at the same point Wink
damn.
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Peter_Plade
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PostPosted: Wed Nov 07, 2012 12:09 am    Post subject: Reply with quote

They can also brake in the other end Shocked
This is the one that broke when I was running my Judson motor.
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grueni
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PostPosted: Wed Nov 07, 2012 2:55 am    Post subject: Reply with quote

autsch...than i had luck with my supercharged engine.
but on the medusa engine i let the crank checked alot. maybe because they are so old? so allways better to use a porsche 356 one Wink
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mightymouse
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PostPosted: Thu Nov 08, 2012 3:26 pm    Post subject: Reply with quote

Thats due to no counterweights and no weight on the nose of the crank.
They flex in the middle and thusly break in that same spot at either end. More likely to be the flywheel end because of the flywheel weighing more and contributing more to the flex.
Add counterweights and heavier pulley or harmonic damper.
Problems will cease.
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Note to EVERYONE.
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gimmesomeshelter
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PostPosted: Thu Nov 08, 2012 3:52 pm    Post subject: Reply with quote

Shocked
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Mr. Motorhead
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PostPosted: Thu Nov 08, 2012 5:14 pm    Post subject: Reply with quote

Peter_Plade wrote:

This time Im putting in a 72mm stroker crank, this should make it a 1341cc, kind of exited to see how this will work out.

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72mm is a very popular stroke, out of the three I had made up from Porsche cranks I only have one left.
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oldbusboy
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PostPosted: Mon Dec 10, 2012 3:02 pm    Post subject: Reply with quote

Hi Peter,

You've run both a Judson and an Express engine on the same car. Can you pick which of the two gave you better low and top end performance? Which did you enjoy more? Which (if either) was a pain to set-up and maintain?

Thanks
Trevor
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Peter_Plade
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PostPosted: Tue Dec 11, 2012 6:16 am    Post subject: Reply with quote

Hi Trevor
I like the Express motor the most. Not near the same problems as I had with the Judson.
And I can push it much more without it getting to hot.
Only thing that I miss is the torque at low rpms that the Judson had.
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Peter_Plade
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PostPosted: Sun Feb 17, 2013 3:41 pm    Post subject: Reply with quote

Finnally I made some progress on the motor.
The short block is now assembled, and now some machine work is needed before I can get any further.
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Peter_Plade
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PostPosted: Sun Feb 23, 2014 10:22 am    Post subject: Reply with quote

I had 8500 trouble free kilometers with the new set up last summer.
The extra ccm made some nice low end torque,and the hp raised to 55 on the dyno.
This winter I made a new "Abarth" for it and now it's ready for some more driving Very Happy

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turbolaz
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PostPosted: Fri Mar 07, 2014 6:23 pm    Post subject: engine Reply with quote

Nice engine peter, im looking to build something like this what size crank did you use? what kind of carb kit is that?
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Peter_Plade
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PostPosted: Sat Mar 08, 2014 12:10 pm    Post subject: Reply with quote

I use a 72mm DPR crank, it's really good!
The kit is Autotechnik Express made in Hannover.
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malsteph
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PostPosted: Thu Apr 03, 2014 7:19 am    Post subject: Reply with quote

You could use an early Porsche cam. (103 if my memory is correct)
Period correct and very compatible with the rest of the engine.

Id would probably move the power band a little higher in the revs. But if you are still getting good torque value around 3000 RPM, it is worth a try.
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tobiasax
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PostPosted: Thu Apr 03, 2014 11:10 am    Post subject: Reply with quote

malsteph wrote:
You could use an early Porsche cam. (103 if my memory is correct)
Period correct and very compatible with the rest of the engine.

Id would probably move the power band a little higher in the revs. But if you are still getting good torque value around 3000 RPM, it is worth a try.


Hello malsteph: Have you good info on early Porsche cams? I have bee trying to find out what different cams the pre-A had, but haven't really succeeded.
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Peter_Plade
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PostPosted: Fri Apr 04, 2014 12:39 pm    Post subject: Reply with quote

I use a mr okrasa cam and have no plans changing it, since it runs so good as it does. Might look for other cams if I some day need to take it apart again.
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