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Intake track porting

 
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cmetuning



Joined: 06 Aug 2005
Posts: 6
Location: Central Pennsylvania

PostPosted: Thu Aug 11, 2005 4:44 am    Post subject: Intake track porting Reply with quote

So, I have started autocrossing and I run my 87 Rx-7 in csp. In the rule book it says you can port your intake runners one inch in from the ends. I was intrested in match porting the intake runners to each other and leaving the motor alone. Are their any real improvements over stock? Also would a extrude hone intake make any inprovements? (I am sure this is not legal in the class I am running but the thought seemed to be relevent.) (All mods would be to a 87 intake.)
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GTChris



Joined: 13 Jul 2005
Posts: 12
Location: Portland, OR.

PostPosted: Tue Aug 16, 2005 8:00 am    Post subject: Reply with quote

One thing you could do is to convert over to S5 intake manifolds, however there are a few small mods to be done, Includind sensor swaping, a bit of port matching as well. The S5 manifold is far beter than the S4 and if you did this mod the tech's would never be able to tell what you have done.

Do you have the PR 6 port sleaves?
biggest gane for $$ spent.


Chris...
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crankstart13b



Joined: 26 May 2006
Posts: 13
Location: PERTH on EARTH

PostPosted: Fri May 26, 2006 9:15 am    Post subject: Reply with quote

there might be a crafty way around those rules.........
if an 87 has to run an 87 motor (i assume yours is turbo)
get an 87 na motor for its endplates (and high comp rotors)
make 1 motor from the two
turbo centre plate, oil pump, housings (and rotors depending on your fuel and or boost)
Na 6p end plates(basically better than you can port to anyway{water jacket is moved}
NOW (manifold porting rules technicaly not broken)fill the turbo manifold face with allum welder, and reface it
place 6p gasket on new facing and mark it
die grind common ground to 6p manifold(up to 1 inch of course)
.Viola
its still an 87 motor
stock manifolds(turbo) used.
genuine stock mazda parts used
die matched 1 inch(eyebrow match the endplates 2 runners together if u can get away with it)
(you get more porting,and comp if you use rotors)
if you need that low rpm torque back then
search out a very early turbo throttle body
the ones with thermo/vacuum auxillary secondary butterflies
if you hook them up to the correct (primary motor side)vaccuum/boost source, they become BOOST secondaries.and hide the big ports till you make boost at 2200 rpm on.
HOPE FULLY this is only stretching the rules. Twisted Evil
makes a very good street engine for light car though.
us aussies won a famous yacht race once by looking closely at the rule book
_________________
here, hold the ends of these two wires.
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