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Author Topic: New Vintage Project, 250cc M-VG, Reconstruction of a 1933 French Jonghi 350  (Read 29929 times)

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Offline thefrenchowl

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Re: New Vintage Project, 250cc M-VG, Reconstruction of a 1933 French Jonghi 350
« Reply #150 on: February 17, 2019, 05:11:12 PM »
Hi,

Little details, balance pipe for the gas tank:



One lucky charm is as good as another...



Not my fav work, started the filler...





While it's drying, my mind wanders... Since there's room in the sump for about 1.5 quarts of oil, I don't need the external oil tank... Leave it out would leave a big hole, so decided to convert it into a breather tank :grin:

I did buy a beautiful repro alloy cap for it, time to mod it mercilessly!!!.





So long,

Patrick
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...What exactly are we trying to do here?...

Online salt27

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Re: New Vintage Project, 250cc M-VG, Reconstruction of a 1933 French Jonghi 350
« Reply #151 on: February 17, 2019, 07:44:06 PM »
Patrick, you may need to install screw clamps on your balance tube hose instead of wire to be SCTA legal.

I witnessed wire being rejected once.

  Don

Offline WOODY@DDLLC

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Re: New Vintage Project, 250cc M-VG, Reconstruction of a 1933 French Jonghi 350
« Reply #152 on: February 18, 2019, 09:10:41 AM »
A bony, chrome talisman - but nice tuck!  :-D :cheers:
All models are wrong, but some are useful! G.E. Box (1967) www.designdreams.biz

Offline thefrenchowl

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Re: New Vintage Project, 250cc M-VG, Reconstruction of a 1933 French Jonghi 350
« Reply #153 on: February 18, 2019, 10:32:58 AM »
You're right, Don, I'll revisit!!!

Patrick
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...What exactly are we trying to do here?...

Online salt27

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Re: New Vintage Project, 250cc M-VG, Reconstruction of a 1933 French Jonghi 350
« Reply #154 on: February 18, 2019, 09:50:55 PM »
Patrick, I forgot to mention how much I enjoy this build, keep up the good work.   :cheers:

I remember Lars introducing us in 2011? at Speedweek.

  Don

Offline thefrenchowl

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Re: New Vintage Project, 250cc M-VG, Reconstruction of a 1933 French Jonghi 350
« Reply #155 on: February 19, 2019, 04:30:11 AM »
Ah Lars, he did get a record... I'm still chasing one!!!



Patrick
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...What exactly are we trying to do here?...

Offline Doc B.

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Re: New Vintage Project, 250cc M-VG, Reconstruction of a 1933 French Jonghi 350
« Reply #156 on: February 19, 2019, 11:01:21 AM »
Patrick, you may need to install screw clamps on your balance tube hose instead of wire to be SCTA legal.

I witnessed wire being rejected once.

  Don


Ditto AMA, and likely FIM, too. Also applies to fire sleeving. You can probably guess how I know.

Offline ProjectROTM

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Hi Patrick,

I was digging though some old photos and stumbled across this which reminded me of your project. Unfortunately, my restaurant level French isn't quite up to reading the blurb though.





Cheers,

Christian

Offline thefrenchowl

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Hi Christian,

Yes, small world!!!

350 twin cam Jonghi from the Nougier stable of racers looked after by Claude Caucal, the very man who parted with the Jonghi TT 2 race parts that I am using for my reconstruction...

I will see him and the stable in early May at the Montlhery concrete Speed Bowl...

The DOHC tower from my own photo collection:



And a period shot at or near Montlhery:



See you around,

Patrick

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...What exactly are we trying to do here?...

Offline thefrenchowl

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Hi,

Not too many news recently...

Received my last lot of non standard ball bearings, 25 x 52 x 12, they are for the external flywheel bearing



A lot of 30 Amal new jets for a small price, plus the special key elsewhere:



Made a little holder for them.





Very nice day for this 1st day of Spring, I hope my friend in Wales has managed to paint the tanks and a few other pieces,,,

So long,

Patrick
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...What exactly are we trying to do here?...

Offline thefrenchowl

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Hi,

Paint all done and drying, will probably pick it up tomorrow, thanks Jimmy in North Wales!!!







Patrick
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...What exactly are we trying to do here?...

Offline thefrenchowl

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Hi...

When all is running way too smoothly, it's time to start worrying  :-D
 
The clear coat was supposed to be cellulose based, but it refused to dry...

So, scrapped it all, back to square one...

While waiting, about 2 weeks, I started to reassemble the engine.

Race cam timing recorded.

Also fitted the street covers to record street timing as well...







Race graph:



Street graph:



So long,

Patrick
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...What exactly are we trying to do here?...

Offline thefrenchowl

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Hi,

Time to hurry up a touch, May will soon be here!!!

Another few hours spent making a tool to insert the clutch bell ball bearing...





Clutch in there:





Primary transmission:



Gearbox:





See you later, I'll put the bottom end in the frame before any other engine assembly...

Patrick
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...What exactly are we trying to do here?...

Offline fordboy628

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Patrick,

Very "spiffy".    Nice special tools.    Lots of attention to details, like profiling the cams.

 :cheers:
Fordboy
I used to be a people person.  But people changed that relationship.

"There is nothing permanent except change."    Heraclitus

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Offline Koncretekid

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Patrick,
I too like to profile my cams.  It looks like you measured lift in thousandths of an inch, but posted the graph "Y" axis in mm, but I can't make sense of the "X" axis.  I like to graph my lift versus degrees to be able to see where the overlap occurs relative to TDC.  I tend to run my cam (single cam) retarded to move the hp curve higher on the rpm scale because my motors will hold up at 7500 rpm (90mm stroke B50) and seem to keep increasing hp up to 7200 rpm.
Tom
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