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Hi,
I'm called Santos, I'm 22 years old, Brazilian/Australian and armed with a license to drive
Today i purchased a red '87 Mazda 121 Funtop. I am owner No: 3.5.
It has excellent service history with 190 000km's (118066.00000 :wink: )
The body/interior is immaculate and the motor revvy and responsive. It is stock and 'factory' condition.
(I actually cringe at the idea of changing anything it's so nice :? )
Best of all is words on the manufacturer's plaque. Made in Japan.
The reason why i got it was to have a platform to get some experience in engine blueprinting. (I own a '92 Suzuki Sierra, second owner. I have plans for it but i don't want to touch it while I'm 'green') I liked the little Funtops and the B-Series works out to be quite a flexible platform for what i want to do.
And that is this:
In Australia engine mods need engineer's certificates and grossly effect insurance and registration... not to mention anything not listed is a playground for police defect notices which require it going over the pits leading to more defect's etc etc.
So what I'm wanting to do is work with my current engine block. After all if it's engine number matches the one on the registration papers and all the stuff appears stock then a random police officer wouldn't really know things like it's supposed to be packing a Carby and not EFI or that air box was only available from 93 onwards and so on. (I actually checked with the motor registry and they said it was OK to interchange parts to older models if it was available on a same design later model vehicle providing all the pollution gear was carried over)
I was winning a complete B5 motor on Ebay for $50 but the seller cancelled the auction as the item was 'damaged'
Anyway since i didn't get it i have a clean slate for ideas !
The essential ingredients have to be Junkyard sourceable and Stealth.
Idea no 1.
Bore out the block to 75mm to use OEM B5 pistons. (which then can be taken to 76mm in the future if i keep the car) bolt on a B3 16v SOHC off a later model Mazda DB 'bubble' with EFI manifolds. Megasquirt fit into B3 ECU shell. All the little things like helping it breath ,swap in B5 cams and valves etc
Theory. Smaller head cylinder volume will lead to a higher compression. Making it a NA engine. Arguably as it's all internal you can't be expected to know about it.
Idea no 2.
Bolt on a B5 16v SOHC, standard 71mm bore, place a small supercharger where a factory A/C would be , belt tensioner and all (be really cheeky and have a plaque made with the Mazda factory A/C part number and stick it on) a bypass valve (not a blow off) again the Megaquirt inside the ECU housing and all the little things (stage one this forums calls it)
Theory. Larger cylinder head volume would lower the compression. Have the supercharger's electro-magnetic clutch hooked to a switch on the dash (My idea is to find an auto gearbox power/economy switch, a little less conspicuous then a missile toggle switch
)
triggering a mild boost of 6-8psi.
It's all theory so i am sure there will be many obstacles but I'm wanting realistic gains on a budget and Boring + Supercharging as Idea 3 (which some off you had for just that moment) is doubling my cost
:roll:
Anyway that's me in brief.
I'm called Santos, I'm 22 years old, Brazilian/Australian and armed with a license to drive
Today i purchased a red '87 Mazda 121 Funtop. I am owner No: 3.5.
It has excellent service history with 190 000km's (118066.00000 :wink: )
The body/interior is immaculate and the motor revvy and responsive. It is stock and 'factory' condition.
(I actually cringe at the idea of changing anything it's so nice :? )
Best of all is words on the manufacturer's plaque. Made in Japan.
The reason why i got it was to have a platform to get some experience in engine blueprinting. (I own a '92 Suzuki Sierra, second owner. I have plans for it but i don't want to touch it while I'm 'green') I liked the little Funtops and the B-Series works out to be quite a flexible platform for what i want to do.
And that is this:
In Australia engine mods need engineer's certificates and grossly effect insurance and registration... not to mention anything not listed is a playground for police defect notices which require it going over the pits leading to more defect's etc etc.
So what I'm wanting to do is work with my current engine block. After all if it's engine number matches the one on the registration papers and all the stuff appears stock then a random police officer wouldn't really know things like it's supposed to be packing a Carby and not EFI or that air box was only available from 93 onwards and so on. (I actually checked with the motor registry and they said it was OK to interchange parts to older models if it was available on a same design later model vehicle providing all the pollution gear was carried over)
I was winning a complete B5 motor on Ebay for $50 but the seller cancelled the auction as the item was 'damaged'
Anyway since i didn't get it i have a clean slate for ideas !
The essential ingredients have to be Junkyard sourceable and Stealth.
Idea no 1.
Bore out the block to 75mm to use OEM B5 pistons. (which then can be taken to 76mm in the future if i keep the car) bolt on a B3 16v SOHC off a later model Mazda DB 'bubble' with EFI manifolds. Megasquirt fit into B3 ECU shell. All the little things like helping it breath ,swap in B5 cams and valves etc
Theory. Smaller head cylinder volume will lead to a higher compression. Making it a NA engine. Arguably as it's all internal you can't be expected to know about it.
Idea no 2.
Bolt on a B5 16v SOHC, standard 71mm bore, place a small supercharger where a factory A/C would be , belt tensioner and all (be really cheeky and have a plaque made with the Mazda factory A/C part number and stick it on) a bypass valve (not a blow off) again the Megaquirt inside the ECU housing and all the little things (stage one this forums calls it)
Theory. Larger cylinder head volume would lower the compression. Have the supercharger's electro-magnetic clutch hooked to a switch on the dash (My idea is to find an auto gearbox power/economy switch, a little less conspicuous then a missile toggle switch
) triggering a mild boost of 6-8psi.
It's all theory so i am sure there will be many obstacles but I'm wanting realistic gains on a budget and Boring + Supercharging as Idea 3 (which some off you had for just that moment) is doubling my cost
:roll:
Anyway that's me in brief.
(again not the intended exercise)
but it´s in the eye of the beholder.
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