Paul,
How is the 13b Cosmo engine different? I am looking at one on ebay. I
remember seeing some mention of a difference. Maybe it was the exhaust
port size....
-- 
Blake C. Lewis

If it is Japanese spec it has larger intake ports.
What year is it?

They don't say they are a jdm importer. They just say it is 90-96.
Blake

OK then it is probably the big port version of the 13B Cosmo
engine. Just like Bulents.

Paul,
Tracy says that the ports are not larger, they only appear so because
the intake runners enter the housings at an oblique angle.  They look
larger to me because they are definitely wider as you can see in the
attached photos.  All the Cosmo engines were turbocharged, so, they have
lower compression rotors.  I have seen 8.1:1 mentioned.   Is  that
correct?   I like mounting Tracy's PSRU on the Cosmo bell housing like
Bullent's installation or like the alternate scheme that was described a
few months ago.  The Cosmo starter is heavier than the other Mazda
starters and rotates in the opposite direction.

Blake, do you have the ability to inspect the engine?  Most of the JDM
importers usually want to get between $1200 and $1500 for the Cosmo
engines.  Their warranties are not very useful if you have a $300
shipping charge invested before inspecting the engine.  One eBay seller
recently had a Cosmo engine for sale that had been disassembled.  In
that case, it was possible to see the condition of the housings and end
plates.  It was a no-sale because the reserve was more than the $750
(approx.) final bid.  Are you going to Osh?

Aubrey


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