Cam Identification

[clivegto]

Bought this flowed cylinder head last week with cams. The cams have a B stamped on the ends. I was wondering what the B stands for. I remember it been mentioned before but can not remember or find it with the search function.

[MeanBean49]

Only way to ident cams is measure lobes and compare specs

[Buzuki]

Cams with stamp `B ` is from 88- R750J model (not 89 K model) , intake cam lobe height is 33,878mm - 33,918mm , exaust cam lobe height is 33,533mm - 33,573mm .  

[MeanBean49]

38 minutes ago, Buzuki said:

Cams with stamp `B ` is from 88- R750J model (not 89 K model) , intake cam lobe height is 33,878mm - 33,918mm , exaust cam lobe height is 33,533mm - 33,573mm .  

Any set of cams can have a B on them, its just random, just to do with the batch number, had them on alsorts of cams from different models

[clivegto]

Good chance they might be hot cams as apparently the head & cams came from a X racer.

[MeanBean49]

18 minutes ago, clivegto said:

Good chance they might be hot cams as apparently the head & cams came from a X racer.

Look pretty stock, can see the 27a, unless they have been reground. Get em measured

[clivegto]

17 minutes ago, MeanBean49 said:

Look pretty stock, can see the 27a, unless they have been reground. Get em measured

Am thinking might be J or K cams if I am lucky.

[Sandman]

If the camshafts are regrinds, they should be marked somewhere? 

Edited March 4, 2019 by Sandman
Spelling

[Buzuki]

2 hours ago, MeanBean49 said:

Any set of cams can have a B on them, its just random, just to do with the batch number, had them on alsorts of cams from different models

Maybe , but according to original Suzuki service manuals and my experience end side letter stamp is factory mark from main reason to distinguish them from model to model ,

for example cams with stamped letter : 

A - cams from late R750M model with 8 lobes per cam 

B - cams from R750J model , where R750K model have same intake (B) cam, but exaust cam is with slightly different characteristics and different letter stamp 

C - cams from early R750F,G,H models 

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picture from my Suzuki original service manual for GSXR750J (1988) model (German language version) 

 

[Dezza]

Weird Suzuki must have had it in mind that there will be 2 additional variants of the GSXR750 that would each require different cams when they made the original F model (C cams) or else they would have started on A (which seems logical). Why they reverse letter ranking I wonder? Maybe this is the way they do things in Japan.

[Lachie04]

http://old-skool-suzuki.proboards.com/thread/1546/oilcooled-camshafts-specs