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Old 11-02-2013, 05:41 PM   #121
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Depends on what sort of power band your after really

Personally id go with the 9:1 but *shrug*
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Old 11-02-2013, 06:12 PM   #122
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Depends on what sort of power band your after really

Personally id go with the 9:1 but *shrug*
Thats what I'm thinking too man... Ive got them here. So long as the pistons are the same size in the bpt block them ill be ok. But they look stock anyway
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Old 19-02-2013, 06:34 AM   #123
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got the head back from the rebuilders stripped and cleaned. So i did some port matching with my gaskets






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Old 19-02-2013, 07:36 AM   #124
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you shouldn't be laying that head on hard surfaces, you will scratch up the mating surface and will get poor sealing later!

put it on a piece of wood!
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Old 19-02-2013, 07:48 AM   #125
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you shouldn't be laying that head on hard surfaces, you will scratch up the mating surface and will get poor sealing later!

put it on a piece of wood!
Yer i know, but it hasnt been decked yet, and i was very gental with it
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Old 19-02-2013, 07:51 AM   #126
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it looks like a substantial amount of metal which can be removed, but I recall reading an article from a builder in the States, who said he would spend 20-25 hours on a head and would not increase the tops at all etc. are you just going to open it up so its a gradual increase until it's the same size as the gasket?
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Old 19-02-2013, 08:06 AM   #127
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Question - Are the exhaust port the same size as the holes as the gasket or head?
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Old 19-02-2013, 08:13 AM   #128
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Question - Are the exhaust port the same size as the holes as the gasket or head?
Hmmm the same size as the gasket. Well very close to the same size. Will need a small hit with the air drill but it will be fine the intake one was the only one i was worried about anyway.
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Old 19-02-2013, 08:55 AM   #129
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so exhaust manifold ports are much bigger than the head port. thats good to know.
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Old 19-02-2013, 09:08 AM   #130
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so exhaust manifold ports are much bigger than the head port. thats good to know.
yes will take photos tonight and upload them this week to show. its the same with after market manifolds. they get the exhaust flange made to the same size as gasket... lol so u have this massive difference in sizes from head to manifold. look at Dane's, kris's, marc's headers for instance.
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Old 19-02-2013, 09:10 AM   #131
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Yer i know, but it hasnt been decked yet, and i was very gental with it
deep gouges cannot be easily removed without going beyond spec
you still should use that piece of wood!
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Old 19-02-2013, 09:12 AM   #132
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yes will take photos tonight and upload them this week to show. its the same with after market manifolds. they get the exhaust flange made to the same size as gasket... lol so u have this massive difference in sizes from head to manifold. look at Dane's, kris's, marc's headers for instance.
I thought you're putting on a turbo?
the stock turbo manifolds and dump pipes have lots of meat in it to carve out for better, reliable flow


you should also keep in mind that the intake ports should NOT be smooth... a rough textured surface is best to promote fuel atomisation.... smooth surfaces causes fuel pooling and poor engine efficiency results!
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Old 19-02-2013, 09:13 AM   #133
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deep gouges cannot be easily removed without going beyond spec
you still should use that piece of wood!
thanks amte

also who says im going to spec anyway
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Old 19-02-2013, 08:35 PM   #134
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read this before you go any further with porting!
http://www.edmunds.com/mazda/mx-5-mi...tests-nav-tabs
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Old 19-02-2013, 10:55 PM   #135
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Yeah that's the article I was referring to Ed!
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Old 20-02-2013, 07:02 AM   #136
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that's a good read.. hmmm i didn't go that insane with the porting on the manifold. just the ports to match the gaskets.
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Old 20-02-2013, 11:12 AM   #137
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Thanks for the info. I'm gonna keep watching to see the end result.
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Old 20-02-2013, 11:52 AM   #138
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Well if phill gets a dyno day sorted for the 20-21/4/13 will see what the figures are like.
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Old 25-02-2013, 12:34 PM   #139
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so on the weekend i stripped my bpt motor that i had bought just 3 weeks ago of FL.com. all was going well. found out the it had a set of b6t rods in it with some bp26 stamped pistons . So im assuming that they where standard pistons.



Now here is for the kicker. I did notice till it was completely apart but the block has a gash taken out of piston bore number three. Its so bad that i cant actually hone it out. so there goes that idea for just replacing rings and bearing.



but then i though to my self.. hmmm wait i have a spare BP series 3 block at home that all we need to do is tap the water and oil in the block and BAM its a bpt block..

WWWEEELLLLL the water tap went well but the oil one not so well. u have to drill about 150mm down into the block to hit the oil gallery that supplies the oil to bearing number 4. well yer we must have been drilling on a slit angle and we cam out the side.

Needless to say at this point im so pissed off that i just dont give two ****s.

so anyway now im looking for a bpt block thats standard bore in size to put all my bpt pistons and b6t rods in..


the plan will be now to find a bpt block. put everything into that and bolt it into the car. get the mod plate and everything approved by qld transport. then rip it all out in a couple of months to bore out the block and replave the internals with foged gear..

i should have done this months ago but i was trying to keep everything on the cost effective side.. but hey now i have learn't that lesson i'll keep on moving. after all that happend i'll be able to bolt on my Evo8MR turbo i bought a couple of months back and get a twin scroll set going.
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Old 25-02-2013, 07:44 PM   #140
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Why not just hone what you've got, replace rings and not worry about the score mark if its only a few months.
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