My ports are too large!

[JayDee]

Originally posted by BNA_ELLIS
Some how I don\'t think anyone else will be showing their ports.
rx7 community have more secrets when it comes to porting & tuning than Area 51.

Hi Brian, you have seen mine in person(ports), I think I have posted some primarys on here before.
Come on Carl, dont be shy!!!
After all mine look like Rotecknik$ ports;)

[Glenn Butcher]

Secondaries...

[bnaellis]

What kind of boost was that at Glen?

Jase I think you the only person that would make my large ports look small if I remember yours correctly:rollin

rgds

[Glenn Butcher]

Just under 20psi Brian.

Have you guys seen Cosmo 13B or 20B standard ports?  they are HUGE!!!  It is one of the reasons why 13 Cosmo engines are quite sort after.

[bnaellis]

Yes I have , that would be why a certain builder called Tim has an ever growing collection recently.

[JayDee]

Originally posted by gbutcher
Just under 20psi Brian.

Have you guys seen Cosmo 13B or 20B standard ports?  they are HUGE!!!  It is one of the reasons why 13 Cosmo engines are quite sort after.

You can go very big on the REW end plates, the RE centre plate is quite handy for size.

Thanks brian my girlfriend says I make others look small aswell:cool

[JayDee]

Brian,
Ports look very nice, you well be surprised how un-laggy your turbo will be with those ports:)

Jason

[Glenn Butcher]

Originally posted by JayDee
Brian,
Ports look very nice, you well be surprised how un-laggy your turbo will be with those ports:)

Jason

Jason, yes - that is something many people forget.  A nicely ported engine can have a surprising amount of power on its own.

A friend with a bridgeported twin turbo engine in his RX-7 was amazed by the amount of power the engine had, with 0 psi of boost i.e. a stack of torque right from idle.

[antnicuk]

now this is getting good.

I would post piccys of mine but the engine is back together..... sorry.

Glen,  i take it that engine is dowled,  do they use short dowels like the mazda stock ones or are they shorter or longer?  

Regards
Tony

[Glenn Butcher]

Originally posted by antnicuk
now this is getting good.

I would post piccys of mine but the engine is back together..... sorry.

Glen,  i take it that engine is dowled,  do they use short dowels like the mazda stock ones or are they shorter or longer?  

Regards
Tony

Hi Tony,

Yeah - it is dowelled, but really not the best way. This particular engine was dowelled with the short ones (17 extra dowells, each side of both rotor housings).  Some people use this technique some use the heavier through bolts etc., which I believe it better.

Some people like Marty Heard (AVENGE - on ausrotary.com) don\'t believe in Dowell\'s at all, and he owns an 8.1 second 1/4 mile twin turbo 13B.

Go figure!

[Glenn Butcher]

Standard Mazda dowells are still used.

[bnaellis]

Originally posted by JayDee
Brian,
Ports look very nice, you well be surprised how un-laggy your turbo will be with those ports:)

Jason

The pics does not show enough detail but the runners and port shape are a real work of art. I expect full boost to be 5-5.5k rpm but I also expect it to get t there alot quicker than before.
Engines not doweled I don\'t believe in that either but to each there own I guess.

[Timrxmotors]

My engine isn\'t dowelled either,I have found no need to,not yet anyway.

[Glenn Butcher]

Tim,

Do you match-port the inlet manifold? I\'m assuming you would - I know some people don\'t and are missing out on more power.

[Carl]

Originally posted by JayDee
Hi Brian, you have seen mine in person(ports), I think I have posted some primarys on here before.
Come on Carl, dont be shy!!!
After all mine look like Rotecknik$ ports;)

Hi Jason,
I have put a pic up of my porting on a new thread just for you!
http://www.mazdarotaryclub.com/forums/showthread.php?s=&threadid=14602
regards
Carl