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mattstriumph
mattstriumph
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M.A.P. Triumph 76 Offset Crank #350398
12/29/10 9:11 pm
12/29/10 9:11 pm
Joined: Dec 2010
Posts: 31
Florida
M
M.A.P. Offline OP

Triumph Parts
M.A.P.  Offline OP

Triumph Parts
M

Joined: Dec 2010
Posts: 31
Florida
[Linked Image]

[Linked Image]

Well here it is. After a bit of soul searching we decided to go ahead and build some 76 degree offset Triumph Cranks. As with all of our cranks this one is Fully Heat-Treated, then Nitrited, 4340 Billet Material. Photo shows the 82mm version. We also offer a 89mm Stroker version with 1-3/4" Norton sized mains.

We are taking orders for another batch (8-12 weeks). A $250 deposit will get one in the queue.

Current price - $1600 ($1500 for 82mm 360 cranks) includes balancing with purchase of MAP rods and pistons.

Matching cams in a few different street grinds are available. These cams are sold at our usual price and will Not have the customary add-on fees normally associate with "specials" and "custom" grinds as sold elsewhere.

NEW: A matching Full digital electronic ignition system is now in stock $325

Marino
MAP Cycle

Last edited by M.A.P.; 02/23/13 8:28 pm.
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Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #350416
12/29/10 11:39 pm
12/29/10 11:39 pm
Joined: Mar 2005
Posts: 10,251
Boston, Massachusetts
J
John Healy Offline
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John Healy  Offline
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J

Joined: Mar 2005
Posts: 10,251
Boston, Massachusetts
Nice!!


Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #350424
12/30/10 12:30 am
12/30/10 12:30 am
Joined: Apr 2006
Posts: 1,709
Virginia, USA
SBoyd Offline
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SBoyd  Offline
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Joined: Apr 2006
Posts: 1,709
Virginia, USA
Unbelievable.
Inspiration to build one more bike from the ground up.


Stop the insanity.
Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #351206
01/03/11 7:00 pm
01/03/11 7:00 pm
Joined: Feb 2005
Posts: 564
San Francisco Bay Area
M
MarksterTT Offline
BritBike Forum member
MarksterTT  Offline
BritBike Forum member
M

Joined: Feb 2005
Posts: 564
San Francisco Bay Area
Beautiful crank Marino, if you have time, would you briefly explain rationale of using 76* offset versus 90*? Will a modern ignition be available? I know Pazon has a 90* so I would imagine a 76* would be available for the asking. Mark

Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #351485
01/05/11 10:16 am
01/05/11 10:16 am
Joined: May 2006
Posts: 509
melbourne, australia
7
76degree-triumph Offline
BritBike Forum member
76degree-triumph  Offline
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7

Joined: May 2006
Posts: 509
melbourne, australia
I wish this was around when I was building mine! Now everyone will have one, a 360 will sound weird comin from a Trumpy. :laugh


What balance factor are they balanced to? And to what configeration eg MAP rods and pistons or stock Triumph pistons & rods.

How is the drive side big end fed, and as it has a threaded plug on the timing side to suit a sludge trap tube, does it run a sludge trap?

Will MAP be making an ignition to suit? In my experience this has been the biggest complication.

Will race cams be available?

I reckon these cranks will sell well. Good on ya :beerchug

Cheers, Chris.



1950 Speed Twin outfit
1951 Thunderbird outfit (76 degree racebike, or is it 90 deg now?)
1955 BSA D3 minibike outfit
Triumph solo's
Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #351756
01/06/11 11:21 pm
01/06/11 11:21 pm
Joined: Jun 2008
Posts: 64
Halifax, Nova Scotia, Canada
Queen's Horseman Offline
BritBike Forum member
Queen's Horseman  Offline
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Joined: Jun 2008
Posts: 64
Halifax, Nova Scotia, Canada
Way to go MAP!

I have lusted after a 90 degree T140 crank for several years so I look forward to seeing if you will offer that version as well. Getting the matching cams in is also a big plus.

So please let us know:

1. Will there be a 90 degree version?
2. Any plans for suplying electronic ignitions to match?

Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #352045
01/08/11 6:57 pm
01/08/11 6:57 pm
Joined: Feb 2005
Posts: 564
San Francisco Bay Area
M
MarksterTT Offline
BritBike Forum member
MarksterTT  Offline
BritBike Forum member
M

Joined: Feb 2005
Posts: 564
San Francisco Bay Area
Queens Horsemen,
I asked Marino those very questions yesterday and on the 90* crank I'm afraid not. He's pretty much committed his time and resources to the 76* and feels it's the way to go for now, considering stock 82mm stroke and 6.5" rods. The first run of these sold immediately, both the 82mm and 89mm, 3 of each I believe. I wouldn't hold my breath on waiting for a 90* & I'm no engineer but think perhaps the 76* may induce less of a rocking couple then the 90*, no idea if it would even be noticeable though. I stand to be corrected on this. Marino did think a package deal would be the best way to go, his crank,pistons,rods but didn't imply one was forthcoming. He mentioned 3 cams similar to mega 1000, 1060 and one I can't remember (these are old no.s) are only weeks away @ same price as his other std. type cams, $395.00 I believe.
On the ignition, Marino said he has talked to Pazon about this but nothing firm yet. I emailed Andy at Pazon and he said the same. He did say he had a lot of commitments at the moment. I followed up by asking if we couldn't just reslot the rotor on the 360 or 90* version of his dual plugged Smartfire but so far no answer. It would seem that if the 90* works then converting to 76* by using a modified rotor shouldn't be a problem since the Smartfire uses a single pick up with dbl. slotted rotor. It would still be a wasted spark system.
I guess the bottom line is, if you want an offset billet crank it's going to be 76* and you better put your deposit down and get in the que if you want one any time soon...

Chris, did you get my pm?

Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #352168
01/09/11 8:59 am
01/09/11 8:59 am
Joined: Oct 2010
Posts: 11
nsw australia
B
briorm Offline
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briorm  Offline
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B

Joined: Oct 2010
Posts: 11
nsw australia
yes thanks i want one with rods and pistons balanced and posted thanks 48-50% balance factor no bs. about time some one has made these cranks in billet good on you marino 'for keeping the dream alive thanks brian

Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #352285
01/09/11 9:31 pm
01/09/11 9:31 pm
Joined: Apr 2006
Posts: 1,406
New Zealand
J
johnm Offline
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johnm  Offline
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J

Joined: Apr 2006
Posts: 1,406
New Zealand
Go here for something on the theory 90 versus 76 78 etc.

http://www.xs650.org.au/vtwin.html

Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #352359
01/10/11 9:16 am
01/10/11 9:16 am
Joined: May 2006
Posts: 509
melbourne, australia
7
76degree-triumph Offline
BritBike Forum member
76degree-triumph  Offline
BritBike Forum member
7

Joined: May 2006
Posts: 509
melbourne, australia
Mark-you have mail.


1950 Speed Twin outfit
1951 Thunderbird outfit (76 degree racebike, or is it 90 deg now?)
1955 BSA D3 minibike outfit
Triumph solo's
Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #365704
03/30/11 11:35 am
03/30/11 11:35 am
Joined: Jan 2005
Posts: 1,667
East Bethany New York
Dick Harris Offline
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Dick Harris  Offline
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Joined: Jan 2005
Posts: 1,667
East Bethany New York
When I built my 76% crank,I talked to Boyer and he sent me a setup which included a pickup with only one coil and a standard rotor which I had to move one of the magnets 38%. It has worked beautifully. The only trouble I ever had was the magnets got weak and it was hard to start. New magnets,back to one or two kick starts. It has around 62k on it at present. Man, I also wish that MAP billet crank was available when I built mine. Real nice Marino!!! Dick

Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #366566
04/04/11 1:13 pm
04/04/11 1:13 pm
Joined: Apr 2005
Posts: 2,443
Bega NSW Australia
Mark Parker Offline
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Mark Parker  Offline
BritBike Forum member

Joined: Apr 2005
Posts: 2,443
Bega NSW Australia
Great looking crank.
Something I noticed with ign on my 90deg was it seems better without an idle spark from the other cyl, I changed to 2 separate ignitions, just a matter of two pickup coils and one trigger/bar spinning round. (Rather than two bars past one coil firing two plugs together.)You can do this using the stock mechanical adv with a bar welded to it. And use the pickups to switch transistors that fire a coil each.


mark
Re: M.A.P. Triumph 76 Offset Crank [Re: M.A.P.] #367510
04/10/11 10:13 am
04/10/11 10:13 am
Joined: May 2006
Posts: 509
melbourne, australia
7
76degree-triumph Offline
BritBike Forum member
76degree-triumph  Offline
BritBike Forum member
7

Joined: May 2006
Posts: 509
melbourne, australia
This weekend at a racemeeting I used a trispark ign on the 76deg outfit. It has a deadspark and you do have to drill your own holes in the rotor and fit the magnets. I used the trispark as the Boyer failed last year and I wanted to try something new.
The bike has never ran so well.
Then the crankcases fell apart.
That withstanding there are now options for staggered crank ignitions in trumpy's. Do your research, its never been easier to do this conversion.
Chris


1950 Speed Twin outfit
1951 Thunderbird outfit (76 degree racebike, or is it 90 deg now?)
1955 BSA D3 minibike outfit
Triumph solo's
Re: M.A.P. Triumph 76 Offset Crank [Re: 76degree-triumph] #472834
01/17/13 3:26 pm
01/17/13 3:26 pm
Joined: Dec 2010
Posts: 31
Florida
M
M.A.P. Offline OP

Triumph Parts
M.A.P.  Offline OP

Triumph Parts
M

Joined: Dec 2010
Posts: 31
Florida
Hey Chris, Heard you moved to a 90. Hows that going. Lot of pros to the 76 as I see it!

Marino


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