power ported TS1

[davidblythe]

Have a Lined TS1 225 that has not had a boost port cut into the inlet

idea is to use mitaka TS250 pistons as they are cheap as chips for the quality on a 115mm rod with 18mm small end which I have in 58mm and 60mm strokes

will have no issues with ring pegs, then drop the timings down to stage 4 and run it on a clubman with a 30mm phbh

will not run 360deg timing on the inlet but cut the piston to run 150degs

idea is to replicate a trials bike power output and run high gearing to compensate

with all timings aiming to peak at 6500 rpm

any thoughts

[Avantone]

Have a Lined TS1 225 that has not had a boost port cut into the inlet

idea is to use mitaka TS250 pistons as they are cheap as chips for the quality on a 115mm rod with 18mm small end which I have in 58mm and 60mm strokes

will have no issues with ring pegs, then drop the timings down to stage 4 and run it on a clubman with a 30mm phbh

will not run 360deg timing on the inlet but cut the piston to run 150degs

idea is to replicate a trials bike power output and run high gearing to compensate

with all timings aiming to peak at 6500 rpm

any thoughts

I think I'd let it breath - it could be a bit of a lose/lose situation, where you have little of the benefits of variable inlet timing, but a big restriction in the tract.

I'd be tempted to use a windowed piston, but use a modest sized carb ........ nothing bigger than 28mm; and then combine that with an Agusto or similar.

[sean brady scooters]

i doubt that you could get inlet timing that low....on that.

sounds like a waste of a TS1 kit to me ,with possibly no advantage to you....
but let us know how this all works out...

[davidblythe]

ts250 73mm, bottom of inlet 99mm, -1mm deck clearance 157degs with sensible exh 175 and tfr 122

so you are right sean 155 not possible

no deck clearance and it comes down but exhaust and tfrs pushed far too high

[davidblythe]

theres nothing too lose any way,

if it doesnt work convert the piston to 360 degs and cut a boost port in something to do over the winter

[J1MS]

I would be looking along the lines of Avantone's approach to this...

[dsc scotty]

Been running these pistons for years and I mean years! Suppose the price of ts piston are gonna sky rocket now.

[davidblythe]

Been running these for years and I mean years! Suppose the price of ts piston are gonna sky rocket now.

I know what you mean, paid £20 for two new wiseco 72mm TS250 Complete pistons,

[sean brady scooters]

i cant help but think dave that you would be far better off with a 250 kit from AF
or a cast 240 kit..

[grimspeed]

linerd ts1. piston ported.its called a rapido. what a wast of a ts1.
get a cheep dt 250 off ebay and cut finger ports to suit.