Bridgestone Motorcycle Parts Discussion Board
Bridgestone Tech Talk => 350 Talk => Topic started by: BRT-GTR on October 01, 2014, 02:57:55 PM
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Hi Moonpup,
Just read your response in General Discussion,Nos 175 Barrels, but will rely in 350 Talk.
I am aware of the real variations in the barrel castings for the 350. You may remember, I 'didn't tread on your toes', in a follow up topic as below where we had a long discussion on this very subject (Was 12 months ago). :-
http://bridgestonemotorcycleparts.com/index.php?topic=3159.0 (http://bridgestonemotorcycleparts.com/index.php?topic=3159.0)
Referring back to the original link in your post, have a look at photos 4 & 5 . :-
http://bridgestonemotorcycleparts.com/index.php?topic=2822.0 (http://bridgestonemotorcycleparts.com/index.php?topic=2822.0)
What you see is a l/h barrel on top of another l/h barrel, they will look different because of the front to back taper on these parts, they are not symmetrical . Analogy - put your L hand on top of your R hand in front of you, palms together. They don't match, turn one hand round and they do. To do a true shape comparison, you need a left and a right hand barrel placed on each other. It was only some time afterwards that I realised the oversight in Steve's post. ( I have checked with him that he is OK with me saying this).
So, I believe we can rule out any significant change in the barrel/head profile shapes for the 350. OK, there maybe some very minor shape variations between the shapes cast by different suppliers, (possibly 2 or even 3?).
The above does not help in sorting out the known 5 barrel variations, you identified but it does exclude another possible complication for anyone trying to get a matching pair.
I now have 3 GTR engines, an early one,-879 and 2 later - 6052, 6868. When I've got them stripped down I'll make a tracing of each of the head shapes to see if there is any difference and post the findings.
Regards, Brian the Brit.
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That's cool Brian, but to set the record straight unless there's any confusion, I merely kept track of the different variation combinations that I picked up on throughtout the thread and never got into any discussion of any "significant change in the barrel/head profile shapes for the 350".
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No worries, Moonpup, as our Aus friends would say. I'm sure we will get to the bottom of this topic one day but maybe not right now. Too many GTRs to sort out. Brian.