free hit
counters
Head and Block Castings - Engine/Ancilliaries - The Lotus Forums - Lotus Community Partner #ForTheOwners Jump to content


IGNORED

Head and Block Castings


mswest68

Recommended Posts

Does anyone know the differences in block and head castings from the 1975 907 through the Esprit S2 907 castings?  It looks to me like the block numbers never changed through these years (B907E0708S). Were the internal block castings identical through these years?  On the other hand, I see a bunch of different part numbers for the 907 heads from 75 – 79.  The differences appear to be more towards the ancillaries and not reflective of the internal casting geometry of the ports and cooling passages.  I'm trying to determine if these years are generally interchangeable with regards to internal castings.  Thanks! 

Link to comment
Share on other sites


Upgrade today to remove Google ads and support TLF.
  • Replies 3
  • Created
  • Last Reply

Top Posters In This Topic

Top Posters In This Topic

from info learned through earlier today, it appears all heads are the same form early JH through 80ish Lotus s 2.0.. differences seem to be imitated to the water outlet through the head instead of the earlier intake manifold. reducing destination in cylinder # 4

 

Understanding that once you get into the stroker engine specs, head geometry changes considerable.

Link to comment
Share on other sites

  • 2 years later...

I have a couple of 2 litre 907 engines from  78 and 79 Esprits and a later 912 2.2 litre from a early 80's front engined car either Excel or Eclat.  The basic block castings look the same though there may be some minor machining drilling and tapping difference depending on the original application. The major difference with the 912 block was the beefier ladder bearing carrier and sump casting but the block itself appears to be the same as the earlier 2 litre 907

The earlier 70's rope seal blocks in the Jensen Healys may have been different  as Lotus is supposed to have updated the block due to liner reliability problems according to wikipedia ??

Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.



Upgrade today to remove Google ads and support TLF.


×
×
  • Create New...