12a bridgeport 6port
#26
Full Member
Thread Starter
laping or skiming works fine if done right... be better to find a set of plates without as much wear then you not affecting the harding... i have noticed that the 6port end plates dont wear as fast as 4 port ones. maybe they used a diffrent way of harding them?
#27
Junior Member
Urqhartglen any advice for me ? and i also have another question for u since u are from NZ i have heard about some front wheel drive rotary conversions have u ever came acorss any ? i am also thinking of putting a rotary in a front wheel drive car not going big on HP jus around 300 hp max
thanks
thanks
#28
Full Member
Thread Starter
Is there any estimate on the power it makes? I'm assuming a four port would make less power down low but more up high with a bridge port as opposed to the six port, but that's just going by everything I've read from previous attempts (more specifically, six port 13B vs. four port 12A both bridge ported). I'm really interested in knowing how much power it puts to the ground.
I think that this is a really great project to have. I wish that six port 12A's (or even four port 12A's at this point) were far easier to come by so I could experiment with stuff like this.
I think that this is a really great project to have. I wish that six port 12A's (or even four port 12A's at this point) were far easier to come by so I could experiment with stuff like this.
it lacks a bit after 9000rpm over a 4port but way more torque down low (under 5000rpm) than a 4port. so nice to drive my wife uses it as well without a problem.
the engine is from a mid 80s cosmo. we have lots of 6port 12a stuff over here and no one was really using them so parts and engines were cheaper than the more common 4port so i thought why not ????????????? glad i did.. there still people who say to me why did you do that or get a 4port and bridge it etc. then they drive it and not 1 person hasnt liked it for power delivery etc but if high revs and out right power are your aim (drag/race) then use a 4port as i found they are better at high revs (over 8500 to 9000rpm) i have enough power to pull 8700rpm in 5th gear.. around 230kmph
#29
Full Member
Thread Starter
Urqhartglen any advice for me ? and i also have another question for u since u are from NZ i have heard about some front wheel drive rotary conversions have u ever came acorss any ? i am also thinking of putting a rotary in a front wheel drive car not going big on HP jus around 300 hp max
thanks
thanks
not very nice to drive tho, have look on( www.trademe.co.nz )type in mazda 323 rotary 12a and look through its a red wagon for sale on there. may give u sum ideas. if it still on there i post link up for you tonite as its lunch time and i dont have time to do so at moment... we got rotarys in everything hahaah vans, utes 323 bmw merc etc etc. if it will fit in then sumone is driving it lol...
#30
Terrified.
hi. making mid 190hp from old set up unsure what it is making with new carbs.
it lacks a bit after 9000rpm over a 4port but way more torque down low (under 5000rpm) than a 4port. so nice to drive my wife uses it as well without a problem.
the engine is from a mid 80s cosmo. we have lots of 6port 12a stuff over here and no one was really using them so parts and engines were cheaper than the more common 4port so i thought why not ????????????? glad i did.. there still people who say to me why did you do that or get a 4port and bridge it etc. then they drive it and not 1 person hasnt liked it for power delivery etc but if high revs and out right power are your aim (drag/race) then use a 4port as i found they are better at high revs (over 8500 to 9000rpm) i have enough power to pull 8700rpm in 5th gear.. around 230kmph
it lacks a bit after 9000rpm over a 4port but way more torque down low (under 5000rpm) than a 4port. so nice to drive my wife uses it as well without a problem.
the engine is from a mid 80s cosmo. we have lots of 6port 12a stuff over here and no one was really using them so parts and engines were cheaper than the more common 4port so i thought why not ????????????? glad i did.. there still people who say to me why did you do that or get a 4port and bridge it etc. then they drive it and not 1 person hasnt liked it for power delivery etc but if high revs and out right power are your aim (drag/race) then use a 4port as i found they are better at high revs (over 8500 to 9000rpm) i have enough power to pull 8700rpm in 5th gear.. around 230kmph
#31
Full Member
Thread Starter
It sounds like a fantastic solution for someone who wants more power than a street port, but still wants to drive their car on the street. I'm looking to get my hands on a six port 13B soon and building it for a friend just because of this thread and for the entire reason that he wants to drive it on the street, but wants more power than his current street ported 12A. I think it would be a wise decision.
#32
Terrified.
do you want templates? for 6 port. i left the runner std just polished and didnt really take much out of it apart from under cutting the port for air flow to catch on the bridgeport... carfull when porting the center plate as the water jackets are close. i have spare plates so i cut one up to see how far i could go before i hit water and made template from there... im doing a 13b s5 6port at moment that is going full bridge and carbed as he likes my engine and wanted one to behave the same but with extra grunt of a 13b
#33
Full Member
Thread Starter
Urqhartglen any advice for me ? and i also have another question for u since u are from NZ i have heard about some front wheel drive rotary conversions have u ever came acorss any ? i am also thinking of putting a rotary in a front wheel drive car not going big on HP jus around 300 hp max
thanks
thanks
#34
Full Member
Thread Starter
Or will photo copy onto paper for free plus post and you cut it onto alloy or steel sheet. or use paper as a guide
#35
Junior Member
ok so before i start lapping i have one concern , the reason why i am going to lap the plates is because closet to where the spark plugs are there is a distinct line which i can feel with my fingers ,if i were to lap until this is flat i would cut out the nitride treated layer , do u think i just take the shine out of the plate and leave it with the line or should i lap the whole plate till its smooth and flat ? i am not sure if i can get the plate nitride in my country but i will look in to that depending on the advice u give
#36
Full Member
Thread Starter
ok so before i start lapping i have one concern , the reason why i am going to lap the plates is because closet to where the spark plugs are there is a distinct line which i can feel with my fingers ,if i were to lap until this is flat i would cut out the nitride treated layer , do u think i just take the shine out of the plate and leave it with the line or should i lap the whole plate till its smooth and flat ? i am not sure if i can get the plate nitride in my country but i will look in to that depending on the advice u give
were are you from? is there a machine shop there that can skim plate using carbite tooling to get smooth finish and then a quick lap you ready.
to lap those wear marks out you will be there for ages and never keep it flat
#37
Junior Member
yes there are machine shops where i can do that but i jus dont kno any where that does nitride hardening by the way i live in trinidad and tobago its an island in the caribbean, here is a pic of the step i will have to mesure how much the edge is with a dial indicator havent gotten aroound to it yet i jus felt the step with my fingers and it was very distinct so i just tought the worst lol any where here is the pic
Last edited by gready123456; 04-09-10 at 05:09 PM.
#38
Full Member
Thread Starter
yes there are machine shops where i can do that but i jus dont kno any where that does nitride hardening by the way i live in trinidad and tobago its an island in the caribbean, here is a pic of the step i will have to mesure how much the edge is with a dial indicator havent gotten aroound to it yet i jus felt the step with my fingers and it was very distinct so i just tought the worst lol any where here is the pic
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