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Catalina 34

General Activities => Main Message Board => Topic started by: ken003 on May 14, 2008, 08:44:33 PM

Title: Transmission gear ratio
Post by: ken003 on May 14, 2008, 08:44:33 PM
I am learing about engines and transmissions.  I have an M35B engine.  It has a spec label on it of HBW-100.  The transmission plate says model ZF 10M.  Am I correct in that these are different names for the same transmission?  The transmission also shows "A=1.79  B=1.86".  I figure these are gear ratios, but what exactly are A and B?

Thanks for any help,
Ken
Title: Re: Transmission gear ratio
Post by: Stu Jackson on May 14, 2008, 08:50:04 PM
Have you read the manual?  Available at: http://www.c34.org/manuals/Hurth_HB_Transmission_Manual.pdf
Title: Re: Transmission gear ratio
Post by: tonywright on May 15, 2008, 07:16:12 AM
The A value is the gear ratio when the transmission turns opposite to engine rotation. The B value is the ratio when turning in the same direction as the engine.

Tony
Title: Re: Transmission gear ratio
Post by: Ron Hill on May 15, 2008, 06:47:51 PM
Ken : The HBW 100 and the ZF10 are one in the same.  That xmission comes in a couple of gear ratios - I'll guess that yours is the 1:1.8 ratio. 
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