Tuned cylinder pics

Her kan man diskutere Tuning af Yamaha FS1. YamahaFs1.dk kan under ingen omstændigheder gøres ansvarlig for oplysninger / opfordringer
omkring ulovlig kørsel med tun eller skade på materiel / fører, som følge af rådgivning fra brugere af forummet.
Flika
Junior knallert
Indlæg: 22
Tilmeldt: man 3. aug 2009 01:24

Tuned cylinder pics

Indlægaf Flika » lør 12. sep 2009 00:54

Here's some pics of a cylinder I did a while ago,43mm cast iron kit.

Billede

Billede

Billede

Billede

Billede

Brugeravatar
nielsfup
Moderator
Indlæg: 4275
Tilmeldt: søn 7. okt 2007 22:11
Kontakt:

Re: Tuned cylinder pics

Indlægaf nielsfup » lør 12. sep 2009 08:44

Hi Flika
Very nice pictures.

The shape of the exhaust port were known as “donkeys ear shape”
I haven’t tried it yet. But it’s supposed to give a good high end rev performance trust keeping a reasonable low rev performance.
It seem a little tricky to machine
// Niels
FS1-DX-78 5Gear MC
FS1-SS -75 under opbygning
Honda Melody Mini ( stjålet )
Suzuki FZ-50

If you can't dazzle them with brilliance, baffle them with bull (W.C. Fields)

Kvalitets reservedele fås på http://shop.yamahafs1.dk/
Tændings indstillings boks kan ses her viewtopic.php?f=68&t=5580

Flika
Junior knallert
Indlæg: 22
Tilmeldt: man 3. aug 2009 01:24

Re: Tuned cylinder pics

Indlægaf Flika » lør 12. sep 2009 15:16

I ran this shape exhaust port on the Notso Special and it gives a really good spread of power but comes alive when it comes onto pipe. Durations are set really low right now but we will increase the exhaust if necessary the transfers are at maximum width for a 43mm. It's actually easy enough to cut this shape port but you do need to start with a cylinder with a very low exhaust port height. The opened up dual action boost port was time consuming :shock:

Brugeravatar
nielsfup
Moderator
Indlæg: 4275
Tilmeldt: søn 7. okt 2007 22:11
Kontakt:

Re: Tuned cylinder pics

Indlægaf nielsfup » lør 12. sep 2009 17:05

Oh yes i haven’t noticed t that the first time.

Looks really great.

And yes this operation will indeed require a cylinder with low exhaust port. Maybe an old 40mm cylinder bored to 43 or 45 mm will be a good start…

Do it have any drawbacks to remove the small support between the aft scavenge ports
// Niels
FS1-DX-78 5Gear MC
FS1-SS -75 under opbygning
Honda Melody Mini ( stjålet )
Suzuki FZ-50

If you can't dazzle them with brilliance, baffle them with bull (W.C. Fields)

Kvalitets reservedele fås på http://shop.yamahafs1.dk/
Tændings indstillings boks kan ses her viewtopic.php?f=68&t=5580

Flika
Junior knallert
Indlæg: 22
Tilmeldt: man 3. aug 2009 01:24

Re: Tuned cylinder pics

Indlægaf Flika » lør 12. sep 2009 18:10

As long as the port is no wider than 22mm works fine no ring problems at all, at 50% bore width the rings don't open into it.

Brugeravatar
nielsfup
Moderator
Indlæg: 4275
Tilmeldt: søn 7. okt 2007 22:11
Kontakt:

Re: Tuned cylinder pics

Indlægaf nielsfup » lør 12. sep 2009 19:42

Thanks
I will indeed try that approach.
Looks very promising.
// Niels
FS1-DX-78 5Gear MC
FS1-SS -75 under opbygning
Honda Melody Mini ( stjålet )
Suzuki FZ-50

If you can't dazzle them with brilliance, baffle them with bull (W.C. Fields)

Kvalitets reservedele fås på http://shop.yamahafs1.dk/
Tændings indstillings boks kan ses her viewtopic.php?f=68&t=5580


Tilbage til "Tuning"

Hvem er online

Brugere der læser dette forum: Ingen og 5 gæster