16-09-2018, 07:25 PM
Please bear with me as I am not familiar with what does and doesn't work on Austin Seven side valve engine valves and seats for better reliability and incremental improvement in breathing and running.
I am not modifying the block in any way apart from cleaning up ports and fitting new guides, springs and valves.
I have cut new 45 degree seats and am going to cut 30 and 60 degree clearance angles to produce a valve seat width of about .050" to .060" (also suggested by others).
In the book by David Vizard "Tuning BL's A Series Engine" he suggests cleaning up valves and seats as per these drawings as shown in his book:
I'm wondering if these suggestions (particularly the valves) would provide any benefit to my A7 block given as it isn't an A series head? Or am I misguided in my thinking that this will improve flow and breathing - even if it is minimal ?
What are your thoughts ?
Cheers,
Stephen
I am not modifying the block in any way apart from cleaning up ports and fitting new guides, springs and valves.
I have cut new 45 degree seats and am going to cut 30 and 60 degree clearance angles to produce a valve seat width of about .050" to .060" (also suggested by others).
In the book by David Vizard "Tuning BL's A Series Engine" he suggests cleaning up valves and seats as per these drawings as shown in his book:
I'm wondering if these suggestions (particularly the valves) would provide any benefit to my A7 block given as it isn't an A series head? Or am I misguided in my thinking that this will improve flow and breathing - even if it is minimal ?
What are your thoughts ?
Cheers,
Stephen