Tomei 2.8 Stroker

[GODTHRILA]

Hi peps,

I have seen the tomei 2.8 stroker kit and was pretty impressed with bigger capacity yet it has a shorter stroke than std, which in my limited experience would equal more torque with less strain on bearings?

There is a few different piston sizes available in both a normal and "cooling channel" varient... i have no clue what the "ccoling channel" is what it offers and if its a benefit or not?

any input is appreciated

cheers

[Adriano]

99% sure the stroke is longer than stock

[SLIPPERY]

hey scotty are you going to be getting another GTR?

Shorter stroke is the opposite. Less torque and more willingness to rev.

[SLIPPERY]

yeah thats how they add the extra capacity....more stroke

[GODTHRILA]

yeah thats how they add the extra capacity....more stroke

Hey Trav,

Getting another GTR... thats a ellenbrook secret mate!!!

My bad before... obviously there is more stroke to produce bigger capacity and therefore more torque... i ment the rods are shorter than std and therefore less strain on bearings... i have heard that the longer the rods the higher the load on the bearings, so a stroker kit with shorter rods kind of gives the best of both worlds???

anyway... if anyone knows about the cooling channel i would like to know for my secret!!!

[SLIPPERY]

Hot one out in ellenbrook tonight eh? seabreeze howling in woodvale

Mums the word lol

hmmm i would have thought from a physics point of view that the load on the bearings would be irrelevant since the force is parallel to the rod. Its not like the force is a shearing type

[GODTHRILA]

Hot one out in ellenbrook tonight eh? seabreeze howling in woodvale

Mums the word lol

hmmm i would have thought from a physics point of view that the load on the bearings would be irrelevant since the force is parallel to the rod. Its not like the force is a shearing type

rotating force is ment to increase by the square of the RPM or something like that... so even a small increase in rod length might not seem much at low RPM, but rev her up to 8000 RPM and you can have a whole load of extra rotational force being laid out onto the bearings.

so yeah... to keep on track of this thread... cooling channel anyone... what is it, is it better, whats the advantage???

[SLIPPERY]

nothing on the Tomei website?

[GODTHRILA]

nothing on the Tomei website?

none that i could see

[Devils_Advocate21]

cooling channel aids cooling of the top of the piston crown by some say 40 deg c around about n e way. i was led to believe that there slightly smaller pistons than the typical JE or the likes forge ones on the market today and longer stroke?? confirm?

[Adriano]

They only use shorter rods because they have to to fit it all in a stock block. Stock GTR rod/stroke ratio is below optimum, as the rod is on a larger angle to the cylinder, especially when it is a right angle to the crank(where it produces max torque)this results in higher frictional losses. It does have the side effect of reducing detonation, but increases piston accelleration around TDC and BDC

[Duncan]

and also thrust wear on the piston and bores as it slaps around. my engine guy is always complaining about the standard GTR rod/stroke ratio already.

[datsqik]

Cooling channel is just a channel that runs under the piston crown that is in line with the oil squirter so some of the oil that squirts under the piston runs thru the channel and helps cool. This is old diesel tech. The 26 has a less than ideal rod/stroke ratio standard and making it shorter speeds up the piston thru the top even more making the combustion process even faster and can lower the peak hp/rpm although the extra stroke would increase hp. The shorter rods can also slow the piston thru the area of max valve lift again reducing the ability to make hp. The rb26 does a lot of things wrong in theory but still seems to make plenty of hp and loves to rev but i would like to see how a 26 crank in a giken/30 long block would go with some long conrods.

[GODTHRILA]

found this which answers my own question!!! yay!!!

http://www.tomei-p.co.jp/_2003web-catalogu...051_piston.html