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Re: JAP V-Twin engined specials. [Re: trickytree] #396743
09/29/11 9:07 pm
09/29/11 9:07 pm
Joined: Jun 2009
Posts: 197
Lincolnshire, England
trickytree Offline OP
BritBike Forum member
trickytree  Offline OP
BritBike Forum member
Joined: Jun 2009
Posts: 197
Lincolnshire, England
Tis' indeed a Mk.2...looks quite nice with the black castings, makes the push rod tubes and head bolts stand out. Im actually off ooop north tommorow to pick up my castings...a pair of Mk.2 heads, barrels and crank cases...not bothering with a timing cover yet as im not sure what ignition ill be using. My wallet will be considerably lighter


65 A65 bobber
A10 bitza...not (re)born yet
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Re: JAP V-Twin engined specials. [Re: trickytree] #398814
10/14/11 2:24 pm
10/14/11 2:24 pm
Joined: Oct 2004
Posts: 112
Adelaide South Australia
G
GROG Offline
BritBike Forum member
GROG  Offline
BritBike Forum member
G
Joined: Oct 2004
Posts: 112
Adelaide South Australia
I just had an email from a mate telling me to check this forum....something I've been neglecting lately.

The latest (3rd) JAP 8/80 1000cc V twin engine has been singing it's way around the speedway tracks in a sidecar over the last few months in preparation for the coming speedway season. Absolutely trouble free and going hard. It's first event will be the historic championship, so all my fingers are crossed.

You can check it out doing a good 7800 rpm down the straights here on YouTube:

http://www.youtube.com/user/grannyjumast
http://www.eurospares.com/greg.html

Unfortunately the two 1204cc engines for solo racers have still not seen the track yet, the owners are still getting there.... as we all know, it takes so much time even after the engine is installed.

The next build is a pair of Mk2 1340 engines, one is for a pre 1963 class historic road racing sidecar. The other might find it's way on to the salt, with luck.
That should be REALLY fun!

Re: JAP V-Twin engined specials. [Re: GROG] #448315
08/09/12 8:03 am
08/09/12 8:03 am
Joined: Oct 2004
Posts: 112
Adelaide South Australia
G
GROG Offline
BritBike Forum member
GROG  Offline
BritBike Forum member
G
Joined: Oct 2004
Posts: 112
Adelaide South Australia
An update on the JAP engined speedway sidecar I mentioned previously.

16 absolutely trouble free months so far, I think I can breathe a sigh of relief.

It has been on the track for more than dozen events and apart from a failed igntion one night just before the final, it has not missed one race or practice.

Earlier this year we had a look inside the timing chest, removing cams and followers to check for any undue wear etc, but it was pristine. I breathed a bit easier.

Apart oil changes and filter examinations, it has needed no work at all. Valve clearances have't even moved despite the regular revving to around 7400. The limiter is set to 7600 and we hear it just touch it on the straights some times and the data logger that is built in to the ignition system gives a race by race record of the peak revs reached.

Standard racing 8/80 JAPs were reported to produce peak power somewhere around 5900-6200, depending on where you read it. We have not had this engine on a dyno yet, but seat of pants, and Vincent-beating results tell us it is around the 7300-7500 mark, or perhaps more, but we'll stick to the revs we are gearing for until a Vincent blows past.

The closer-to-70-than-60 owner/rider won the Mildura Wintersun Classic speedway event at Mildura in Victoria, Australia, a few months ago, outlasting many of the opposition and beating the fastest Vincent 3 times from 4 on the night. So, he's rather pleased...to say the least.

Yes, I am bragging... and I've been waiting for this moment, I've held my breath too long, ha!

Check it out here:
http://www.youtube.com/user/grannyjumast

and check out the build here:
https://www.dropbox.com/sh/z1s53l07crycwce/AOczE348jq?m

and some workshop porn here, including one of my JAP 1204 cc engines in a part built solo that belongs to a mate who is building a historic road race machine. It was in my shop recently for me to fit the belt drive clutch I made for it.
https://www.dropbox.com/sh/8ivs8ee81r9at2s/gQ5y7RC5J_

Enjoy checking the shelves in the background like I do when I see someone's 'shop pics..heehee!

Cheers,
Greg

Re: JAP V-Twin engined specials. [Re: trickytree] #451490
08/28/12 11:31 pm
08/28/12 11:31 pm
Joined: Apr 2012
Posts: 57
Land of OZ
U
unclechop Offline
BritBike Forum member
unclechop  Offline
BritBike Forum member
U
Joined: Apr 2012
Posts: 57
Land of OZ
HI Greg,
Just checked out your drop box- wow
Ive been a fitter and turner for 15 years and youve made me
inadequate.
Awesome job must be satisfying seeing those engines fire for the
first time.
Id love to make a nice flat tanker with one of those bad boys!
Wow!
Clint


Poor man pays twice
Re: JAP V-Twin engined specials. [Re: unclechop] #451559
08/29/12 2:38 pm
08/29/12 2:38 pm
Joined: Oct 2004
Posts: 112
Adelaide South Australia
G
GROG Offline
BritBike Forum member
GROG  Offline
BritBike Forum member
G
Joined: Oct 2004
Posts: 112
Adelaide South Australia
Ha Clint!
Thanks.
But I'm no fitter and turner or toolmaker, I worked in the electronics industry as a design and development engineer and moved on up to management for quite a few years.

But about 7 or so years ago I got sick of big company politics and got out ..... and turned my hobby/passion into my living.
I'm now poorer and much much happier.

All I've done is watch, listen, read, study and ask questions all my life to get the skills and knowledge that got me here.

Passion and determination. That's all there is to it...ah, and a certain madness.

Re: JAP V-Twin engined specials. [Re: trickytree] #451563
08/29/12 2:52 pm
08/29/12 2:52 pm
Joined: Dec 2004
Posts: 9,224
Scotland
kommando Offline
BritBike Forum member
kommando  Offline
BritBike Forum member
Joined: Dec 2004
Posts: 9,224
Scotland
Grog, amazing work there, glad its turned out well for you even if you are poorer wink .

Re: JAP V-Twin engined specials. [Re: trickytree] #451628
08/29/12 10:14 pm
08/29/12 10:14 pm
Joined: Apr 2012
Posts: 57
Land of OZ
U
unclechop Offline
BritBike Forum member
unclechop  Offline
BritBike Forum member
U
Joined: Apr 2012
Posts: 57
Land of OZ
Greg,
Very insperational
I hope one day I can turn my talents into something like this,It looks very satisfying, A bit more interesting than making peanut butter.
Has there been many hiccups along the way?
Would your cranks fit into a side valve JAP?
I think I know where one is......
Clint


Poor man pays twice
Re: JAP V-Twin engined specials. [Re: unclechop] #451688
08/30/12 7:24 am
08/30/12 7:24 am
Joined: Oct 2004
Posts: 112
Adelaide South Australia
G
GROG Offline
BritBike Forum member
GROG  Offline
BritBike Forum member
G
Joined: Oct 2004
Posts: 112
Adelaide South Australia
No my "standard" cranks I build for my own JAP engines would not suit any JAP as the mainshafts are much larger diameter, Additionally, the cranks are wider, affording longer crankpin and shaft engagement lengths making for a much stiffer and stronger crank.
The mainshafts and pin are press fit only, no shoulders, no nuts. The only way to go. They are metric, to take advantage of more readily available modern bearings and seals etc.

However, I have made replacement cranks for other versions of the race engine. Just recently I made a custom replacement crank for an 8/80 JAP that powers a Cooper race car. The owner was sick of broken crankpins and replacing them along with the main berings every season. He had uprated the mains from what had been originally fitted, with some improvment in reliability and life, but it was still only good for a season. I am tipping that the stiffer crank will help with mian bearing life and the 40mm parallel press fit crankpin with wider modern big end rated caged needle roller bearings will last for at least 2-3 seasons...and only then will be a bit worn...not broken. PM me via the links I provided on the previous pages if you get serious. They aren't cheap, but they don't break.
Cheers,
Greg

Re: JAP V-Twin engined specials. [Re: trickytree] #451689
08/30/12 7:28 am
08/30/12 7:28 am
Joined: Oct 2004
Posts: 112
Adelaide South Australia
G
GROG Offline
BritBike Forum member
GROG  Offline
BritBike Forum member
G
Joined: Oct 2004
Posts: 112
Adelaide South Australia
Clint,
You can contact me via this link: http://www.eurospares.com/greg.html
Greg

Re: JAP V-Twin engined specials. [Re: GROG] #452752
09/04/12 7:12 am
09/04/12 7:12 am
Joined: Apr 2012
Posts: 57
Land of OZ
U
unclechop Offline
BritBike Forum member
unclechop  Offline
BritBike Forum member
U
Joined: Apr 2012
Posts: 57
Land of OZ
PM sent


Poor man pays twice
Re: JAP V-Twin engined specials. [Re: Bucket15] #454142
09/12/12 10:29 pm
09/12/12 10:29 pm
Joined: Apr 2012
Posts: 2
Somerset, UK
G
Geoff Stray Offline
BritBike Forum member
Geoff Stray  Offline
BritBike Forum member
G
Joined: Apr 2012
Posts: 2
Somerset, UK
Any news on the progress of the JAP engined BSA?

Re: JAP V-Twin engined specials. [Re: trickytree] #454162
09/13/12 3:34 am
09/13/12 3:34 am
Joined: Aug 2012
Posts: 591
Oregon
D
Dana_twin Offline
BritBike Forum member
Dana_twin  Offline
BritBike Forum member
D
Joined: Aug 2012
Posts: 591
Oregon
No intention to hijack the thread, just wondering if anyone can recommend a stateside supplier of JAP engine parts? PM preferred. I have a 680cc V twin in a 1927 Zenith to restore. Thanks.

Re: JAP V-Twin engined specials. [Re: trickytree] #466135
12/04/12 5:19 am
12/04/12 5:19 am
Joined: Nov 2011
Posts: 257
terra Australis
P
Pre Unit Offline
BritBike Forum member
Pre Unit  Offline
BritBike Forum member
P
Joined: Nov 2011
Posts: 257
terra Australis
http://2.bp.blogspot.com/_lVCC9aDALT4/R8dRFaovEsI/AAAAAAAABRc/eciCba5olN4/s320/Norton-JAP.jpg

The machine was fabricated in 1953 by Francis T Williams. It was built specifically for riding at Brighton (FTW lived just up the road at Saltdean). It was the 3rd and final version of the Norton-JAP series he built.... The bike was bought in the late 50's by Ernie Woods who named it 'THOR' and rode it at Brighton and other venues for many years. It achieved many wins both for FTW and EW. It made Fastest Tim of the Day at Brighton on several occasions with the highlight years being in the early 60's.

http://thevintagent.blogspot.com.au/2008/02/norton-jap.html

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