[gixxxer1]

somejeffguy said:

gixxer1 said:
i know about the reed valves but, how does engine releive crankcase pressure? stock, it vents into airbox.

with the pair sucker mod, the crankcase vents out through the exhaust.

this is a mod allways worth talking about

only the first 1000 times.

how does it vent out exhaust with pair mod?wouldn't oil be in the exhaust then? i guess this is what i'm missing?

 

[gixxer_kid1987]

does that mad do anything bad to your engine

 

[jeffw]

The standard crank case vent connects into the airbox, where a small filter stops any excessive oil that is forced out of the engine case. This air is then routed back into the f/i system along with normal outside ram air.

The PAIR mod, removes that connection and instead puts it in the pair valve which then vents it into the exhaust system and out of the bike. The high pressue exhaust, creates a low pressure zone around the pair valve (just like draining your watter bed with a hose attached to the sink), allowing the air to be "sucked" from the crank case and out with the hot exhaust gasses.

Doing this mod on any suzuki will not hurt it at all.

 

[gixxxer1]

jeffw said:

The standard crank case vent connects into the airbox, where a small filter stops any excessive oil that is forced out of the engine case. This air is then routed back into the f/i system along with normal outside ram air.

The PAIR mod, removes that connection and instead puts it in the pair valve which then vents it into the exhaust system and out of the bike. The high pressue exhaust, creates a low pressure zone around the pair valve (just like draining your watter bed with a hose attached to the sink), allowing the air to be "sucked" from the crank case and out with the hot exhaust gasses.

Doing this mod on any suzuki will not hurt it at all.

o.k. , you cleared up how it works but, i thought the ports on top of valve cover lead into oil galley where cams and valve springs are . how exactly does it go out exhaust? this is the part i'm missing.

 

[stam]

gixxer1 said:

...... how exactly does it go out exhaust? this is the part i'm missing.

Funny you should ask, the high velocity exhaust gasses will produce a vacuum in correctly
placed tubes/holes place at near right angles to the flow, or something like that.
Notron used this principal years ago they called it 'The Exhaust Ejector', but I think they
used it to cool the engine.
If only they had known about the pair mod they might have won some races.

(Does a wankel have a crankcase?)

 

[gixxer_kid1987]

thanks

 

[somejeffguy]

gixxer1 said:
i thought the ports on top of valve cover lead into oil galley where cams and valve springs are . how exactly does it go out exhaust? this is the part i'm missing.

it only looks that way from the outside. there are passages in the cylinder head that go from the exhaust port up to meet the valve cover.

 

[somejeffguy]

stam said:
Notron used this principal years ago they called it 'The Exhaust Ejector', but I think they
used it to cool the engine.
If only they had known about the pair mod they might have won some races.

the norton rotary did win some races. even a championship or two, and a land speed record, if i remember correctly. i still have some old isle of man videotapes lying around - those rotaries are incredible sounding machines.

it's a shame the current norton company has no plans for rotaries.

 

[gixxxer1]

somejeffguy said:

gixxer1 said:
i thought the ports on top of valve cover lead into oil galley where cams and valve springs are . how exactly does it go out exhaust? this is the part i'm missing.

it only looks that way from the outside. there are passages in the cylinder head that go from the exhaust port up to meet the valve cover.

that would explain why the sniffer readings were way off when they dyno'ed the bike.................

 

[SpencerCycle.com]

Just did a controlled test on these mods and the STV mods. The pair mod will give oyu 2-4 hp. I have it documented. The STV mod will not give any hp WITHOUT remapping.It lost power. It gives tremendous throttle response (i like it alot) and showed a 4-5 hp gain after remapping. I did unshroud the injectors as well wen i removed the STV's.

 

[stam]

SpencerCyclecom said:

Just did a controlled test on these mods and the STV mods. The pair mod will give oyu 2-4
hp. I have it documented. The STV mod will not give any hp WITHOUT remapping.It lost power. It gives tremendous throttle response (i like it alot) and showed a 4-5 hp gain after
remapping. I did unshroud the injectors as well wen i removed the STV's.

Post the dyno graph then.

I removed my STVs from my K3 and it is much stronger now.
I didn'r remap yet, but I can feel it at 8,000 the front will just lift now in 2nd gear and
sometimes in 3rd as well, I love it.

 

[racerboy]

Unshroud the injectors? Is that relocating them?

 

[gsxr_45]

Installed my GI PRO yesterday gonna be sweet to be direct in the lower gears, also did the PAIR mod took about an hour to do both 140 for the gipro and 8 bucks to do the pair mod . Bike runs smoother and has that tight feel to it , never rode it but i can tell it's gonna be sweet , had to bump the idle up a bit , may have to tweak the fast idle we'll see when i fire it up next . Thanks for everyones feed back big help , Bugman is 1 .

 

[matt whittaker]

Just did a controlled test on these mods and the STV mods. The pair mod will give oyu 2-4 hp. I have it documented. The STV mod will not give any hp WITHOUT remapping.It lost power. It gives tremendous throttle response (i like it alot) and showed a 4-5 hp gain after remapping. I did unshroud the injectors as well wen i removed the STV's.

Please explain "unshroud the injectors".

 

[Throttlestop]

You guys resurrected a dead thread from almost 5 years ago and expect a reply? Some of these guys don't even post up anymore.

 

[d207gp]

You guys resurrected a dead thread from almost 5 years ago and expect a reply? Some of these guys don't even post up anymore.

Color me stupid but this is one of the first relatively in-depth explanations I've seen on this. Whoever resurrected this thread, thanks!

 

[Throttlestop]

You wouldn't want to do this mod on your K5 / K6 / K7 without looking up updated PAIR threads for the newer bikes. With the enlarged holes between cylinders that serve to reduce pumping losses on the newer bikes, PAIR mods now have a much reduced effect, compared to the early K1/K2 models.

At least two members here who have done the mod in previous years reported blowouts of the cylinder head gasket/plug from a build up of pressure in the cylinder head, due to fouled PAIR reeds. The hot air that vents from the crankcase breather contains oily fumes, and if these are routed to the PAIR reed intakes, they will cause heavy fouling that prevents equalisation of upper crankcase pressure, that may lead to failure of the seals, as was experienced by some.

The proper termination of the crankcase breather would be into an oil catch tank, such as this manufactured by Yoshimura for K1 to K7 models. The reed and airbox intakes can then be plugged up.

 

[TRBLNKC]

You wouldn't want to do this mod on your K5 / K6 / K7 without looking up updated PAIR threads for the newer bikes. With the enlarged holes between cylinders that serve to reduce pumping losses on the newer bikes, PAIR mods now have a much reduced effect, compared to the early K1/K2 models.

At least two members here who have done the mod in previous years reported blowouts of the cylinder head gasket/plug from a build up of pressure in the cylinder head, due to fouled PAIR reeds. The hot air that vents from the crankcase breather contains oily fumes, and if these are routed to the PAIR reed intakes, they will cause heavy fouling that prevents equalisation of upper crankcase pressure, that may lead to failure of the seals, as was experienced by some.

The proper termination of the crankcase breather would be into an oil catch tank, such as this manufactured by Yoshimura for K1 to K7 models. The reed and airbox intakes can then be plugged up.

View attachment 66741

Does the Yosh catch tank bolt to the back of the 07 1K engine? Where can I buy the catch tank and other items from yoshimura, as I was told that Yoshimura does not sell to individuals? How much is the tank?

 

[Throttlestop]

If you're in the US, you can order pretty much any Yosh part from Jamie at fuelmotousa.com. The catch tank should retail for close to US$180, and the K7 version has been out for almost a year. We just ordered up one for a K8 from the Yosh shop here in Singapore. And yes, they are designed to bolt up to the back of the engine, with all needed parts supplied in the kit. Makes for a very neat installation.

 

[mpp12]

throtlestop, you have to conect the yoshi canister to the airbox again??
the tube that goes up, right?