Having used the search button and finding out lots of info that will come in useful..
i\'m just wondering what can cause the housing to deteriorate? apart from ware & tare?
the reason for asking is that apparently my engine has done about 50k miles and the more i read the more i believe the water seals have / are going, hence wonder if i have a rebuild, what are the chances of reusing the housing and rotors?
i read rebuilds can cost from 2k (for budget rebuild where housing etc are reused) upwards.
extra being porting, dowling? after market seals n tips etc..
so pointless asking how much a rebuild will cost!
also when porting is done, they say about £300 for porting (depending on what kind of ports) is this £300 just for intake ports or does it include porting the exhaust ports?
(feeling my reply prob will be \'depends who does the work\' or along those lines.)
also what kind of ports would be best for street use? mild ports or large street port? (the turbo has A/R 1.15 hot side and A/R .6 cold side [off the top of my head])
ie port front? port front and rear with larger ports on rear? 1/2 bridge port?
lastly what tips would be best to use? stock mazda ones or other?
Looking around 400 bhp as final result.
supporting mods inc:
PFC, EBC, FMIC, bigger turbo (as kinda mentioned above), 1680cc 2nd injectors, walbro 255lp fuel pump, compression tube, BOV, RE Leads, HKS Twin power, 3\'\' decat.. thats all i can think of atm..
cheers in advance fellas :)
if a water seal has gone early, i believe it can be mainly be put down to the engine flooding, or beeing left flooded for a while, as the un- burnt fuel soaks into the seals which can cause them to deteriorate.
The porting is up to you really, it depends what you want from the car. The bigger the port the worse it will be on fuel consumption, it will also have a negative effect on engine life. But bigger ports aid in spooling up the turbo and also increase your max power. Im not to sure on what ports can create what power, but for 400bhp i belive a large street port would do. A lot of this also depends on the turbo you\'re using too. If your planning to have the work done for you, maybe it would be an idea to ring up a specialist and ask them :D
Water seal failure can be attributed to a number of things - it depends how the water jacket was breached. Corrosion of the plates can happen on old engines, hydro carbons attack the seals all time, but I suspect excessive boost can speed up the process.
I\'ve often wondered about rebuilding an engine (from all new aprts) and using a sacraficial annode in the water jacket - but it\'s never gone any further than pie in the sky so far.
You should be able to make 400 bhp with a big enough turbo / fuelling even on a stock engine with no porting - but the porting will make it easier.
In terms of what to go for - depends, as has been said, on what you plan to do with the car. Fuel consumption and engine life will suffer, as will driveability, the more extreme the porting. But the more you port the more your potential maximum power can be - but at the higher rev range - porting will tend to move the power band up the rev range. There is a reason why they call a street port a street port :)
With good mapping / choice of clutch / drivetrain componnets / turbo, there is no reason why a ported car cannot be made driveable enough to be enjoyed on the road.
As for the water seals - guess it depends on a lot of factors - has the car been sat flooded for any time / what additives used in the coolant / what oil is used / does the engine suffer hot spots because of silted waterways in the coolant jacket ? When the rebuild is done, it\'s helpful for someone to take a good look at the engine and if possible give it the once over to try and determine why it may have failed.
I guess you need to ask yourself what you are aiming for and then go for it. Get a ride in a bridgeported car - see what the car feels like. I\'m sure someone can let you have a ride in a streetported car for comparison :driving
mines a street ported engine with a t51r on it your more than welcome to have a ride in mine sometime so you can see what it feels like:Giggle:Thumbsup!
DtheB: u sound like a pro now :p
cheers for the input. i had a sit in sadgoths fc when that was working. 1/2 bridge port if i remeber correctly n stripped out a bit. from what i recall.. that was a bit of a blur :rollin
thanks for the offer lee :)
i got a plan of action now.. jus seeing peoples thought etc.
it\'s gonna be a beast! still like the sound of bridge port but not really what i want to use it for.
lets see if i can get my beast sorted before Rotorstock, though i just kinda thrown a spanner in my works n might be out of counrty / moving mid year =/
Quote from: BBCFC;582117DtheB: u sound like a pro now :p
He\'s bluffing :Giggle
Everyone who says a rebuild is in the reigion of 2 - 3000? Are they talking including labour?
Surley if you rebuilt the thing yourself you could do it for under a grand? How many bits do you need for god sake? The rotary only has a handfull of moving parts! Lol!
True, when there was more yen to the pound I got my stuff for under £1k.
There are about 45 items that go into 1 rotor though!
QuoteDtheB: u sound like a pro now
sound being the key word :D
QuoteHe\'s bluffing
brett i have something for you
(http://img204.imageshack.us/img204/4420/da236e6a018d47c38f7fba4wc2.jpg)
OWNED
Quote from: Jimi_Hendrix;582152Everyone who says a rebuild is in the reigion of 2 - 3000? Are they talking including labour?
Surley if you rebuilt the thing yourself you could do it for under a grand? How many bits do you need for god sake? The rotary only has a handfull of moving parts! Lol!
as ricco said.. can do cheaper! IF you know how!!
which i dont! :Giggle
Quote from: BBCFC;582295as ricco said.. can do cheaper! IF you know how!!
which i dont! :Giggle
well if you\'re willing to put the time and effort in and you\'re handy with a spanner there\'s no reason why you can\'t do it yourself. Not saying its easy, but it is do able. Also they\'re are some rebuild dvd\'s floating about which help you every step of the way. Personally for the porting i\'d take it to a tuner though :D