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Group N Bellett update
https://delcohacking.net/forums/viewtopic.php?f=13&t=1171
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Author:  yellowperil [ Sun Dec 05, 2010 10:49 am ]
Post subject:  Group N Bellett update

Hi Belletters
I've been promising to put up some photos for a while so here goes.
I hope they end up in order. I had the choice of two different sets of rod - one set being the earlier ones which are slightly lighter (82 g each) and therefore attractive but you will notice a setback in the first photo that occurred with these so I've opted for the heavier, stronger later model type. They have more meat around the big end bearing especially, and carry bigger bolts.
Attachment:
OOPS.jpg
OOPS.jpg [ 45.39 KiB | Viewed 11524 times ]


Piston-gudgeon -rod assemblies are all weighted to 1 g. Two at 1137g and two at 1136g. Piston weights varied from 337 g to 345 g which required some "fettling". Other variables were in big end caps and 1 g variation in gudgeons.
Attachment:
weigh in.jpg
weigh in.jpg [ 45.61 KiB | Viewed 11524 times ]


New hi-tensile main cap bolts were check fitted by the chief financier, kero-cleaner, de-greaser, go-fer and part time casual would-be engineer.
Attachment:
Check fitting new main cap bolts.jpg
Check fitting new main cap bolts.jpg [ 48 KiB | Viewed 11524 times ]


Piston rings came complete with instructions - Perhaps one of our Japanese friends who visit the site can help?
Attachment:
piston rings complete with instructions.jpg
piston rings complete with instructions.jpg [ 44.11 KiB | Viewed 11524 times ]

End gaps checked out beautifully -13 thou for no 1 ring and 10 thou for number 2 without any filing required. The hi tech depth gauge for locating them squarely in the bores took ages to manufacture!!
Attachment:
Checking ring end gaps with hi tech depth gauge.jpg
Checking ring end gaps with hi tech depth gauge.jpg [ 39.4 KiB | Viewed 11524 times ]


The guys at Wade Cams are very helpful. This one’s profile is designed more for massive (?) torque from 35000 rpm upwards rather than for brute HP/speed. Of course they’re good – they originated in Tassie many years ago (but are not related!!).
Attachment:
Racing cam.jpg
Racing cam.jpg [ 39.87 KiB | Viewed 11524 times ]


I’m thinking a red colour for the body will also help. Does anyone have any ideas or know some paint codes?

Stickman, if you know some nice red .............................Morris Marina colours, we could do them too!! :lol:
YP

Author:  KJB [ Sun Dec 05, 2010 9:57 pm ]
Post subject:  Re: Group N Bellett update

Not only the cam grinder but but everything else in the motor would want to be good - at 35ooo rpm's . I think it may have been an Oops!
KB

Author:  gt orphanage [ Sun Dec 05, 2010 10:03 pm ]
Post subject:  Re: Group N Bellett update

what's wrong with 35000 rpm :?: . i would advise a scatter shield minimum of 10mm bissaloy prefered :shock:.

Author:  P.R.90 [ Mon Dec 06, 2010 12:42 am ]
Post subject:  Re: Group N Bellett update

If 35000 rpm is entry revs LOOK OUT rotary's for top end hope it holds together Iwould nearly pay money to see a Bellett motor at 35000 rpm (from a long distance)
Good luck YP it looks like a sweet unit so far
cheers ken

Author:  yellowperil [ Mon Dec 06, 2010 1:09 am ]
Post subject:  Re: Group N Bellett update

Yeeeaaaaggghhhh

She would either really go at 35000 rpm or not at all - probably the latter

OOOPS :oops:

Author:  P.R.90 [ Mon Dec 06, 2010 3:59 am ]
Post subject:  Re: Group N Bellett update

All forgiven still looks gr8
good luck keep pic's coming might see you & cars at Coona 2011.
cheers ken

Author:  GTtoo [ Mon Dec 06, 2010 12:39 pm ]
Post subject:  Re: Group N Bellett update

Yeah, looks like the high tensile chief in the cap !! 3500(0) and beyond is when a pointier cam comes to life, but there's not many places you can do that around here without attracting too much attention, or freaking oneself out a bit as well.

Go the "N". Patience makes perfections,

B.

Author:  P.R.90 [ Mon Dec 06, 2010 7:55 pm ]
Post subject:  Re: Group N Bellett update

Hey YP love the depth measure 3500(0) in a Bellett could nearly create a brown trouser moment.

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