Rotary Engine Building, Porting & Swaps All you could ever want to know about rebuilding and porting your rotary engine! Discussions also on Water, Alcohol, Etc. Injection

porting and compression..

Old 05-02-2012 | 11:28 PM
  #11  
Lynn E. Hanover's Avatar
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Joined: Jan 2004
Posts: 1,322
From: Central Ohio (Hebron) Zephyrhills Fla.
Default Re: porting and compression..

Originally Posted by TYSON
Cranking speed also affects the compression reading
Since too slow a cranking speed gets you a no start, it is a safe bet that cranking speed affects "Dynamic" rather than "Calculated" compression readings.

Compression testing is done with the throttle held wide open. So inlet vacuum numbers would be about zero and very nearly unaffected by cranking speed.

The rotor can be compared to a piston with one ring with 21 end gaps. So sealing is dismal. That is where a high cranking speed becomes critical. The faster the cranking speed the less time to leak down. So many tired worn out engines, and fresh engines built with too much clearance in the gaps will not start on the starter but will bump start quite redily. It is just a matter of cranking speed.

Lynn E. Hanover
Old 05-03-2012 | 10:33 AM
  #12  
MazdaMike02's Avatar
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Joined: Jan 2012
Posts: 2
Default Re: porting and compression..

Aha yes sorry about that I didnt think hard enough before I posted haha. Yes, extending the port (increasing intake duration) Would indeed mean that the port timing is retarded due to the port still being open during part of the compression cycle. But if you were to just modify the port to make it open earlier than you would be advancing the timing.
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