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Post subject: Some questions about +4 115
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KX3  Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1217 Location: Québec |
I want to go the +4/115 way.
engine is '88 F2
Preferably stock 26 power-jet carbs.
Zeeltronic (PV and VCDI)
Clutch -Plate and springs- is 1000km old
Stock pipe to begin with.
Any recommendation?
I want a good $/hp but not a crank killer.
What is involved in this mod?
I think of base 3mm spacer and 2*0.5 base gaskets,
stroker crank, rods and new pistons and head gasket... what's missing?
65 bore?
How many ponnies will I get?
I have a very "humble!" comprehension of timing...
Is there a chart to program the VCDI with this setup?
How about static timing?
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Posted: Fri May 30, 2008 5:00 am
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Post subject: Re: Some questions about +4 115
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SEB4LO All-gear Wheelie! Location: FRANCE - QUIMPER |
| KX3 wrote: |
I want to go the +4/115 way.
engine is '88 F2
Preferably stock 26 power-jet carbs.
Zeeltronic (PV and VCDI)
Clutch -Plate and springs- is 1000km old
Stock pipe to begin with.
Any recommendation?
I want a good $/hp but not a crank killer.
What is involved in this mod?
I think of base 3mm spacer and 2*0.5 base gaskets,
stroker crank, rods and new pistons and head gasket... what's missing?
65 bore?
How many ponnies will I get?
I have a very "humble!" comprehension of timing...
Is there a chart to program the VCDI with this setup?
How about static timing? |
Barnet/Ebc clutch springs
1.5 mm base gasket
bored stock head gasket + 1 center film of another gasket
795 wiseco or WSM pistons
N2 pipes
LOT OF TORQUE AND POWER
ignition = Stock + drilled stator
At least 70 Hp out of the gearbox 
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Posted: Fri May 30, 2008 10:45 am
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Post subject: Re: Some questions about +4 115
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KX3Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1217 Location: Québec |
| SEB4LO wrote: |
Barnet/Ebc clutch springs
1.5 mm base gasket
bored stock head gasket + 1 center film of another gasket
795 wiseco or WSM pistons
N2 pipes
LOT OF TORQUE AND POWER
ignition = Stock + drilled stator
At least 70 Hp out of the gearbox |
Ignition: you mean 31k standard curve on VCDI?
I don't get the "drilled stator" thing 
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Posted: Fri May 30, 2008 12:38 pm
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twinrockMmm, Fully Synthetic! Joined: 21 Jan 2004 Total posts: 1018 |
the crank life will not be an issue as the longer rod length designed to give less pressure on the crank its self..also remember that these aftermarket cranks have off road banshees in mind when designed ie reving its head off all day under bogged conditions of mud and sand...a fraction of what u would put your road bike through...good luck with the build...
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Posted: Fri May 30, 2008 2:14 pm
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SEB4LOAll-gear Wheelie! Location: FRANCE - QUIMPER |
| twinrock wrote: |
| the crank life will not be an issue as the longer rod length designed to give less pressure on the crank its self..also remember that these aftermarket cranks have off road banshees in mind when designed ie reving its head off all day under bogged conditions of mud and sand...a fraction of what u would put your road bike through...good luck with the build... |
Naahhhhhhh
naaaaaahhhhh
AND naaaaahhhh again
70 hp will give 70 hp stress on the rod , ytou heared about something but don't seem to remember , it's about torque efficiency and piston suqirt sterss NEVER about crank issues
aftermaket cranks are no design to be trashed !! , some brands are a bit better than OEM , some are pure shite , but nothing as never be design to use crank bearing in the sand
no relation
Twinidiot = wrong as usual
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Posted: Fri May 30, 2008 2:38 pm
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andys350 Daily Burner Joined: 01 Apr 2008 Total posts: 249 Location: black country |
personally i can't understand the advantage of having a +4mm stroke crank and spacing the barrels up 4mm to allow for it, what do you gain?
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Posted: Fri May 30, 2008 5:14 pm
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Post subject:
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KX3Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1217 Location: Québec |
| andys350 wrote: |
| personally i can't understand the advantage of having a +4mm stroke crank and spacing the barrels up 4mm to allow for it, what do you gain? |
Don't forget the down stroke is longer too...
More displacement, more cc, more HP.
Stroker are known to give torque.
Bigger charge compress in the same combustion chamber
should give bigger explosions...
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Posted: Fri May 30, 2008 7:09 pm
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PicobelloDaily Burner Joined: 23 Oct 2007 Total posts: 186 Location: Netherlands |
3.5mm extra is to much!
+4 stroker crank= 2mm extra upwards and 2mm extra downwards.
2mm (1.5mm spacer + 0.5mm extra gasket (total 2)) will do the job.
Ports can be lowered 4mm to be more effective.
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Posted: Fri May 30, 2008 7:24 pm
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BareAll-gear Wheelie! Joined: 28 Jan 2006 Total posts: 1916 Location: Vancouver Canada |
IF yer seriously wanting more Perf.
Perhaps youi could ask Scott ??
http://home.earthlink.net/~scloughn/index.html
Far more educational than trying to glean info from web sites and brochures.
He's Helpfull and Extremely knowledgeable.
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Posted: Sat May 31, 2008 12:10 am
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SEB4LOAll-gear Wheelie! Location: FRANCE - QUIMPER |
| Picobello wrote: |
3.5mm extra is to much!
+4 stroker crank= 2mm extra upwards and 2mm extra downwards.
2mm (1.5mm spacer + 0.5mm extra gasket (total 2)) will do the job.
Ports can be lowered 4mm to be more effective. |
read careffully and don't put statment about things you didn't read right
a +4 crank is a +2 crank pin offset so it make 4 mm more stroke
NOT 4 IN PMH but both 2mm at 180 and TDC
the advice i gave , make more than 80 gearbox hp with the right pipes , a bit of porting and still stock carbs
1.5 base gasket is the thing to use with YPVS barrels , then the better option for head gasket would be cooper special one
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Posted: Sat May 31, 2008 7:46 am
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twinrockMmm, Fully Synthetic! Joined: 21 Jan 2004 Total posts: 1018 |
seb does your body weight match the size of ur mouth..!! are u honestly telling me that the the increased length of the rod is not intended to reduce stress on the engine ,crank piston or other wise.. also i dont know where u ride your banshees but 80 percent ride in the sand...try running in the sand the engine is under way more stress under those conditions or any off road conditions apposed to road riding..this was the point i was trying to make, so why would a company make cranks designed for anything but worse case conditions ..ie the guy was concerned about the life for his use..which im assuming is on the road. secondly learn some manners i dont give 2 fucks on who you are or what you have done ..forums are about free speech and free flow of ideas not to have pple like you rudely shut others down everytime they have a "different point of veiw".. i know the french are suppose to be a rude bunch but do your pple a favor and get some manners mate..!!!!!!!!!
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Posted: Sat May 31, 2008 2:01 pm
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PicobelloDaily Burner Joined: 23 Oct 2007 Total posts: 186 Location: Netherlands |
| SEB4LO wrote: |
| Picobello wrote: |
3.5mm extra is to much!
+4 stroker crank= 2mm extra upwards and 2mm extra downwards.
2mm (1.5mm spacer + 0.5mm extra gasket (total 2)) will do the job.
Ports can be lowered 4mm to be more effective. |
read careffully and don't put statment about things you didn't read right
a +4 crank is a +2 crank pin offset so it make 4 mm more stroke
NOT 4 IN PMH but both 2mm at 180 and TDC
the advice i gave , make more than 80 gearbox hp with the right pipes , a bit of porting and still stock carbs
1.5 base gasket is the thing to use with YPVS barrels , then the better option for head gasket would be cooper special one |
Isn't that the same thing as I was telling him?
The guy has an '88 YPVS, read the start of this topic:
"want to go the +4/115 way.
engine is '88 F2
Preferably stock 26 power-jet carbs.
Zeeltronic (PV and VCDI)
Clutch -Plate and springs- is 1000km old
Stock pipe to begin with.
Any recommendation?"
I think of base 3mm spacer and 2*0.5 base gaskets,
stroker crank, rods and new pistons and head gasket... what's missing?
65 bore?
Maybe 4L0 is different when you mount a +4 stroker crank but on a 31K or 1WT you need definitely nothing more than a 1.5mm spacer and an extra base gasket. If you raise the cilinders more than that your port timing will be to wild and then you also need to machine off the extra milimeters from the top of the barrel to get the right comprression ratio again.
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Posted: Sat May 31, 2008 2:40 pm
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