Ministroke Taida 43.4 ministroke + Corsa fun
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- Spree
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Ministroke Taida 43.4 ministroke + Corsa fun
another build.
specs:
SYM DD50 block Ported
polini corsa Ported
Ctblack manifold Ported
Taida ministroke crank
7.9 gearing
Kelli Pulley
SEF Ramp
Kelli Heavy Clutch
28OKO carb.
BMF V8 exhaust
ZX transmission
heres the beginning:
all dirty 8K miles!
lots of oil and sludge
specs:
SYM DD50 block Ported
polini corsa Ported
Ctblack manifold Ported
Taida ministroke crank
7.9 gearing
Kelli Pulley
SEF Ramp
Kelli Heavy Clutch
28OKO carb.
BMF V8 exhaust
ZX transmission
heres the beginning:
all dirty 8K miles!
lots of oil and sludge
Last edited by kauaianman on Thu May 21, 2015 5:05 am, edited 1 time in total.
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
cleaning everything up
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
remove motor and everything else
tiny stock intake windows.
lots of humps to take out
tiny stock intake windows.
lots of humps to take out
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
split case and breathe in those little aluminum flakes for a few hours!
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
You should probably cut your gasket to match the block and the cylinder to the block, not just block matching to gasket, there's a huge air flow stop in the corners. Picture the air flowing. Minarelli corsas are worse matched.
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
yup the SYM block is smaller the the AF16 so i match gasket to cylinder and then open case for flow even to cylinder. Cylinder openings are bigger than the stock block openings. AF16 transfer ports are wider/bigger stock than SYM.1man8scoots wrote:You should probably cut your gasket to match the block and the cylinder to the block, not just block matching to gasket, there's a huge air flow stop in the corners. Picture the air flowing. Minarelli corsas are worse matched.
i guess i could have opened up the transfer ports bigger on the corsa then match block for the bigger corsa.
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
i usually degree everything before cutting a custom gasket to set port timings correct for the ministroke crank.
after i find the correct base gasket thickness to get the transfer ports to the correct timing i want, i port the exhaust port to finish off the port timing correction.
i usually shoot for
ex-185*-190*
trans - 130*-135*
bst - 125*- 130*
in this case a 1mm base gasket got my boost and transfer timings right in the zone and i had to open up the exhaust port about 1mm to get that timing correct.
custom cut base gasket matched to cylinder then matched to case
final numbers came out to be
ex- 187*
tns- 135*
bst - 128*
should be OK with 32* of blowdown should give good powerband.
any other suggestions?
after i find the correct base gasket thickness to get the transfer ports to the correct timing i want, i port the exhaust port to finish off the port timing correction.
i usually shoot for
ex-185*-190*
trans - 130*-135*
bst - 125*- 130*
in this case a 1mm base gasket got my boost and transfer timings right in the zone and i had to open up the exhaust port about 1mm to get that timing correct.
custom cut base gasket matched to cylinder then matched to case
final numbers came out to be
ex- 187*
tns- 135*
bst - 128*
should be OK with 32* of blowdown should give good powerband.
any other suggestions?
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
cleaned up cylinder. didn't need much just knife edge transfer openings, chamfer all ports inside cylinder, open exhaust port to accomplish desired 187* of exhaust timing with 1mm base gasket.
after porting and setting up for the correct timing i add whatever head gaskets are needed to get the compression to 120 for street riding.
after porting and setting up for the correct timing i add whatever head gaskets are needed to get the compression to 120 for street riding.
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
CT black was next. great manifold but ugly casting inside from the factory
all cleaned up
also need to clean up mating surfaces so no air leaks
all cleaned up
also need to clean up mating surfaces so no air leaks
Re: Ministroke Taida 43.4 ministroke + Corsa fun
How's the build going?
01 Honda Elite S 120cc Taida H20
78 Honda Hobbit Athena
78 Honda Express/Hobbit Stage6/Athena LC 70
00 Gilera Runner PM Tuning 172
09 Aprillia SR50 Malossi Team MHR
81 Puch ZA50 Polini
71 CT70 Blue
79 Z50 Red
78 Honda Hobbit Athena
78 Honda Express/Hobbit Stage6/Athena LC 70
00 Gilera Runner PM Tuning 172
09 Aprillia SR50 Malossi Team MHR
81 Puch ZA50 Polini
71 CT70 Blue
79 Z50 Red
Re: Ministroke Taida 43.4 ministroke + Corsa fun
legit work!
2000 Elite SR50 -THE PURPLE NURPLE
50mm BBK (tai)
26mm OKO (round slide) 135 Main Jet
V-8 pipe
39/18 secondary gears (7.583:1 ratio)
36 grams in Prodigy variator
Malossi Delta Clutch & WIng Bell- Thanks RED EFT
65mph GPS (on the freeway)
50mm BBK (tai)
26mm OKO (round slide) 135 Main Jet
V-8 pipe
39/18 secondary gears (7.583:1 ratio)
36 grams in Prodigy variator
Malossi Delta Clutch & WIng Bell- Thanks RED EFT
65mph GPS (on the freeway)
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- CB900F
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
I'm interested to know how it's going also. According to my test timing engine and corsas on hand the timing you're looking for wouldn't be done with a simple 1mm base and 1mm up porting of the exhaust. The extra .8mm you added with the fiber gasket and longer stroke you would be over 190 on ex port and blow down wouldn't be near 32. Also with the numbers you're saying you have, you have 27 degrees of blow down. That's not a guess, that is simple math.
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
Simple formula for would be engine and cylinder porters of the world....
Take your exhaust port timing, subtract your transfers, take that number and divide it by 2. There's your blow down. Simple truth.
Take your exhaust port timing, subtract your transfers, take that number and divide it by 2. There's your blow down. Simple truth.
- Mini_Stroker305
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Re: Ministroke Taida 43.4 ministroke + Corsa fun
porting work looks siickkkk dude
96 Yamaha Jog Next Zone CY50
72cc Polini Evo 2
Ruima 41.4 Teflon ministroke
Yasuni C16
24mm Polini pwk
Malossi 8:1 Primary Gears
Malossi VL14 Reeds
Polini 360 Mani
Jaingwayne transmission
Michelin S1 tires 90/90/10
Hoca Racing Fan/Alternator kit
72cc Polini Evo 2
Ruima 41.4 Teflon ministroke
Yasuni C16
24mm Polini pwk
Malossi 8:1 Primary Gears
Malossi VL14 Reeds
Polini 360 Mani
Jaingwayne transmission
Michelin S1 tires 90/90/10
Hoca Racing Fan/Alternator kit