Go Back   Team-BHP > BHP India > Motorbikes > Superbikes & Imports


Reply
 
Thread Tools Search this Thread
Old 15th May 2014, 10:05   #136
BHPian
 
Join Date: Oct 2005
Location: Chennai
Posts: 324
Thanked: 401 Times
Default Re: Harley-Davidson Street 750 : Official Review

This gives a simple animation of the firing sequence and the configuration. Hope this throws more light

http://www.google.co.in/imgres?imgur...ed=0CAsQsCUoAw
arulpeem is offline   (1) Thanks Reply With Quote
Old 15th May 2014, 10:57   #137
Senior - BHPian
 
alpha1's Avatar
 
Join Date: Apr 2007
Location: P00NA
Posts: 1,599
Thanked: 926 Times
Default Re: Harley-Davidson Street 750 : Official Review

Quote:
Originally Posted by Sutripta View Post
Good to know that cylinder timing (ie the timing relationship between cylinders) can be easily/ trivially changed.

Regards
Sutripta
Corrigendum below.

Quote:
Originally Posted by dustom_99 View Post
Much better explained here. http://www.wildwestcycle.com/f_firing.html
Ok so I stand corrected.
First cylinder 0---0---1---0---
Second cylinder -1---0---0---0--
Hence final sound 01--00--10--00--
Or lets remove the "0" since we don't hear it anyway it becomes -1------1-------
So there is a slight offset in the symmetry of bangs.
This gives the characteristic Harley sound.

I have added extra dashes just to increase the resolution of time - the otto cycle remain the same, if I were to use the same methodology for my previous post the final sound pattern for previous post would be 0---0---1---1---

In my opinion the previous post firing sequence should sound more dramatic with a huge asymmetry compare the following two:
--------1---1---
-1------1-------


Wonder why such a sequence was chosen. This is undeniably the most vibration inducing configuration a twin cylinder can ever have!



http://en.wikipedia.org/wiki/Big-bang_firing_order

Also check this, you can actually change the firing pattern even though retaining the same V geometry.

Last edited by alpha1 : 15th May 2014 at 11:18.
alpha1 is offline   Reply With Quote
Old 15th May 2014, 12:00   #138
BHPian
 
ecosport rules's Avatar
 
Join Date: Jun 2013
Location: Hyderabad
Posts: 957
Thanked: 1,194 Times
Default

Quote:
Originally Posted by alpha1 View Post

Wonder why such a sequence was chosen. This is undeniably the most vibration inducing configuration a twin cylinder can ever have!
Brand value and brand identification.

There are people who buy RE's for that sound it makes which is a craze on its own. Same applies here with the HD sound, there has to be some differentiation.

I don't think these vibrations will be so high that you'll have to ease off throttle. HD would have beefed up the insulation so that the ride has an almost vibe-free ride.
ecosport rules is offline   Reply With Quote
Old 15th May 2014, 12:51   #139
BANNED
 
Join Date: May 2009
Location: haridwar
Posts: 588
Thanked: 447 Times
Default

Quote:
Originally Posted by ecosport rules View Post

Brand value and brand identification.

There are people who buy RE's for that sound it makes which is a craze on its own. Same applies here with the HD sound, there has to be some differentiation.

I don't think these vibrations will be so high that you'll have to ease off throttle. HD would have beefed up the insulation so that the ride has an almost vibe-free ride.
I don't think HD thought much about brand image or unique sound when they went for 45* .
Small angle v twin has packaging benefits where you can place a very large motor in a smaller frame.
Touring range is also 45* but is relatively vibe free .
Its past few decades they have cashed in on brand and unique sound.
Also a longer gap in power stroke gives time to recover traction in racing applications.

One less crank pin has pivotal role in reliability as most of the motors fail/ start losing compression or pickup oil due to piston slap or rings breaking seal.
Since most of these start with clearance / play generated on crank pin , one less means one less potential area for such development.
dustom_99 is offline   (1) Thanks Reply With Quote
Old 15th May 2014, 13:56   #140
BHPian
 
Join Date: Aug 2009
Location: Coimbatore / MENA
Posts: 649
Thanked: 921 Times
Default Re: Harley-Davidson Street 750 : Official Review

Quote:
Originally Posted by alpha1 View Post

Wonder why such a sequence was chosen.
Truth is, to save on manufacturing cost, Harley decided to go with a single pin crankshaft which necessitated such a firing order.

Guess the sound was so catchy they have decided to stay with the same since 1903.

Cheers

Ride Safe.
gthang is offline   (1) Thanks Reply With Quote
Old 15th May 2014, 16:11   #141
BANNED
 
Join Date: May 2009
Location: haridwar
Posts: 588
Thanked: 447 Times
Default

Quote:
Originally Posted by gthang View Post

Truth is, to save on manufacturing cost, Harley decided to go with a single pin crankshaft which necessitated such a firing order.

Guess the sound was so catchy they have decided to stay with the same since 1903.

Cheers

Ride Safe.
Who was trying to save cost in 1903 instead of coming up with a product first?
Harley & Davidson build 45 vtwin because that was the only thing they knew how to build with not many designs around to copy and make!
In those days you only made what you could conceive yourself.

They started with single cylinder and graduated to a V twin at a time around 1911. Did so to accommodate bigger motor into a frame that they had already build and used with single cylinder motorized bicycle.


Any leads how could one save on cost by making a single crank pin , instead of dual?
As single crank pin would need heavier crank than dual. Money saved on a pin would not be enough to make a bigger , more robust crank!

And Vtwin or its sound wasn't famous until most of the industry moved over to more economical in lines. which obvious happened much later than 1940-50

Last edited by Samurai : 16th May 2014 at 07:51. Reason: avoid mockery
dustom_99 is offline   (1) Thanks Reply With Quote
Old 15th May 2014, 21:40   #142
Distinguished - BHPian
 
Join Date: Jul 2009
Location: Kolkata
Posts: 3,354
Thanked: 1,763 Times
Default Re: Harley-Davidson Street 750 : Official Review

A V Twin (esp. if aircooled) ticks a lot of boxes when it comes to bikes. In fact a single pin 90 deg V2 has perfect first order balance.

On one hand, it is also packaging considerations which lead to oddball angles. A dual pin design can lead to better balance (on the oddball angles) on the other hand a dual pin makes the engine wider and more asymmetric:- both not desirable when packaging in a bike. Your choice as designer.

Regards
Sutripta

Last edited by Sutripta : 15th May 2014 at 21:57.
Sutripta is offline   Reply With Quote
Old 16th May 2014, 06:26   #143
BHPian
 
Join Date: Aug 2009
Location: Coimbatore / MENA
Posts: 649
Thanked: 921 Times
Default Re: Harley-Davidson Street 750 : Official Review

Food for thought: Ever looked at a radial aircraft engine from ~ 1900?

Cheers

Ride Safe.

Last edited by Samurai : 16th May 2014 at 07:52. Reason: don't react to mockery
gthang is offline   (1) Thanks Reply With Quote
Old 16th May 2014, 07:42   #144
BANNED
 
Join Date: May 2009
Location: haridwar
Posts: 588
Thanked: 447 Times
Default

Quote:
Originally Posted by gthang View Post
Food for thought: Ever looked at a radial aircraft engine from ~ 1900?

Cheers

Ride Safe.
And they told you , v twin single journal was selected for cost cutting in Harley museum?
Which company will tell you that in their own museum?

How do you assume i don't know about radial engines, are you hinting that HD guys should have put a radial in their bikes?

Did they tell you in Milwaukee how were they planning to cut cost by using a single pin?

Last edited by Samurai : 16th May 2014 at 07:53. Reason: avoid mockery
dustom_99 is offline   Reply With Quote
Old 16th May 2014, 07:50   #145
Team-BHP Support
 
Samurai's Avatar
 
Join Date: Jan 2005
Location: B'lore-Manipal
Posts: 21,652
Thanked: 12,553 Times
Default Re: Harley-Davidson Street 750 : Official Review

Cool it guys! Stop getting personal. - Support Team
Samurai is offline   Reply With Quote
Old 16th May 2014, 23:07   #146
BHPian
 
abhimanyu_singh's Avatar
 
Join Date: Feb 2012
Location: Hyderbad/Delhi
Posts: 185
Thanked: 102 Times
Default Re: Harley-Davidson Street 750 : Official Review

A quick question, read it somewhere here, why would a screaming eagle exhaust void street's warranty?? isn't it a genuine accessory?
abhimanyu_singh is offline   Reply With Quote
Old 17th May 2014, 07:22   #147
BHPian
 
adrena's Avatar
 
Join Date: May 2007
Location: Mumbai
Posts: 71
Thanked: 89 Times
Default

I've been baffled by that question forever. It'll be great if someone breaks it down for me.
adrena is offline   Reply With Quote
Old 17th May 2014, 10:57   #148
BHPian
 
abhimanyu_singh's Avatar
 
Join Date: Feb 2012
Location: Hyderbad/Delhi
Posts: 185
Thanked: 102 Times
Default Re: Harley-Davidson Street 750 : Official Review

Quote:
Originally Posted by adrena View Post
I've been baffled by that question forever. It'll be great if someone breaks it down for me.
buddy did you book your bike yet? HD banjara here told me that i can get the stock 2x2 iron's exhaust for the street without voiding warranty, but i doubt that, really confused here!!!
abhimanyu_singh is offline   Reply With Quote
Old 18th May 2014, 08:24   #149
BHPian
 
Join Date: Mar 2010
Location: london
Posts: 29
Thanked: 45 Times
Default Re: Harley-Davidson Street 750 : Official Review

Quote:
Originally Posted by Urban_Nomad View Post
Net net, the only thing that bothers me is the braking. Wires et al be damned. This baby moves and moves well (is the chorus I hear in every review). I would still plonk my money on a green kwacker (a used 650 maybe) though. But for anyone looking beyond the sport bike genre; this is a mighty sweet deal

Aditya - wrt up shifts : tried clutch less shifts (as opposed to full clutch in)? May have produced better results.

And no photos of you scraping pegs? No action shots? Not done bud
I am British with 45 years of bike riding now living in Goa. I had a 40 year old Triumph 3 cyclinder 750cc which I miss. So I had a test ride on the 750 in Goa I found the following:
1. changing up if riding hard no clutch was the best way quick and smooth.
2. front brake needs a steel braided line not rubber this adds to the soft feel.
3.Seat to low for me.
4.fit and finish shows cost cutting, but in my view you get what you pay for so if I go for it some tidying up will be required.

Ken
KEN-RAND is offline   (4) Thanks Reply With Quote
Old 19th May 2014, 06:24   #150
BHPian
 
Join Date: Aug 2013
Location: Pune
Posts: 112
Thanked: 95 Times
Default Re: Harley-Davidson Street 750 : Official Review

Been looking at the dyno jet test of the Street 750 on the cycleworld website. I was surprised that this Harley actually showed a 0-60MPH in 4.6 secs!!! That would just floor the 883 sportsters.
It would be good to see a comparo report of the 750 with the Bonneville.
argchoff is offline   (1) Thanks Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
Harley Davidson Street 750 - Ownership Review rakesh_S Superbikes & Imports 106 14th March 2016 17:44
Scoop Pics : Unidentified Cruiser spotted Testing. EDIT: Harley-Davidson Street 750 ! kpzen Motorbikes 77 19th December 2013 19:43


All times are GMT +5.5. The time now is 15:19.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks