ESE's works engine tuner

[peewee]

yes they will link but because the aux is tear shape it will keep linking to a minimum. unfortunatly there was no other piston choice as far as i know

[Hemi Makutu]

yes they will link but because the aux is tear shape it will keep linking to a minimum. unfortunately there was no other piston choice as far as i know

What piston are you using?

Wiseco list 'em up to 91mm as OS for the 2T Sea Doo 950,
if its a goer, dimensions compatibility-wise - they might do a custom unit from one for you.

[peewee]

its 90.5mm cr500 piston. far as i know prox, oem, wiseco, wossner all have the piston sides sliced off. maybe other engines also use 90.5 but what is the wristpin height and pin diam ? this piston has long side skirting which keeps the aux from linking to the crankcase at tdc. other than the large side cutouts, i think this piston will be fine.

[Hemi Makutu]

Wiseco will likely respond to an info/custom request ( they have a template for this - on their site) & give the dimensions.

Or, ask one of the 'Bucket foundry' blokes here to fill your inconvenient piston cavities with a metal-foam matrix?

www.azom.com/article.aspx?ArticleID=5940

[peewee]

wiseco gladly does special requests but they have a minimum order. ive talked with them about special stuff before. ill just use what I have for now and if I find a better alternative later I can swap out the piston easy enough

[Hemi Makutu]

Sure P-W, try what you have, but asking Wiseco to see the 91mm piston's vital stats shouldn't cost you..
( & what you have is impressive, so thanks - for sharing)

Likely a PWC forum/local rebuild shop could show you one too.

[SwePatrick]

As there are somany experianced tuners writing in this thread i must apologize for asking.

But is there any good quality 66.4mm bore piston with piston ring dowelpin at 6 o clock?
Ofcourse single pistonring.

Rgds
Patrick

[41juergen]

Peewee: Woessner makes pistons to your desired design, it only cost a bit more ...

[Hemi Makutu]

As there are somany experianced tuners writing in this thread i must apologize for asking.

But is there any good quality 66.4mm bore piston with piston ring dowelpin at 6 o clock?
Ofcourse single pistonring.

Rgds
Patrick

If that piston you seek is for a Yamaha, you could be in luck..

[wobbly]

Most all the 66.4 engines can be had in a single ring design, and yes Wossner make plenty of them in flat top and domed
for everything from KTM to CR250

[Flettner]

Peewee: Woessner makes pistons to your desired design, it only cost a bit more ...

I too would be more inclined to use a Woessner, with a comparison on the pistons I use, the Woessner is by far the better piston over the Wiseco and slightly more cost effective too. Next order will be a batch of 10, with this number Woessner will make the changes I want.

[2T Institute]

hey guys im near completetion on this engine and hope I can get some input for the head, im using methanol fuel by the way. cylinder is bolted to the crankcase and ive got a rough cut done on the head, ill check all measurements and do another final cut. because im using Honda piston with longer stroke crank I cut almost 2mm higher into the head and cut the squishband 17* to match the piston. where im needing help is on the comp ratio, width of band and piston to head clearance. heres what I was thinking for a approximate starting place. 16:1, 1.27mm piston head clearance, 50% of area band, dimensions are 90.5mm x 82mm, expected top rpm around 8,000 or so. does these head figures sound about right ? included is photos of piston at bdc and tpc. while im thinking of it I cant remember if I showed my newest bike yet either

Will rev to more like 6000-6500 unless you like rebuilding big ends and your teeth haven't all fallen out from the vibrations

[Hemi Makutu]

http://motocrossactionmag.com/bike-t...e-project-bike

As the reviewers say, if KTM built a current factory version, it'd sell..

500's aren't really too annoyingly vibey to ride, & for sure - they won enough long desert races - in the day.

[peewee]

Will rev to more like 6000-6500 unless you like rebuilding big ends and your teeth haven't all fallen out from the vibrations

it will turn up more than 6500, i know this for sure. hard to say how long big ends will last but its using the prox cr500 conrod assembly. with the old topend that used 92.25 piston, most the vibration seemed to be in the middle rpm range. above and below wasnt all that bad

[TZ350]

Team ESE has taken on a cylinder porting apprentice.