Stroker kit or not ?

radiobar

New Member
hi !

actually we are rebuilding a complete engine.
as we need a new crank and rods,we think
about a stroker kit from Brian Cower with 90mm
pistons and sleeves.

there is the option of 2.2 or 2.35.

what do you think ?
what improvements can we expect from a 2.2 or 2.35 ?

engine has a gt30 (not gt3071) or gt35 turbo, i am not sure.

what about compression ratio ?
should we keep 8.5:1 or go for other one.

is there any effect on idle ? is boost at rpm xxxx higher or lower ?

thanks for any info.
 

Rishi

Still waiting on some shims!
Depends on what you want from the engine to be honest..

I personally quite like the idea of

BC 2.35L
GT35R
8:5:1 C/R

Would make a very powerful and resposive track car!! Also look at the Precision Turbos. They use the Garrett core and tend to spool quicker..


Rishi
 

radiobar

New Member
hi !

i have been told that a gt40 oder gt42 will spool very late.
but with a stroker kit you can rev so high as with a 2.0 engine.
so its nonsense if i have full boost for only 1500 or 2000 rpm.
let say from 5000 to 7000



thanks
 

radiobar

New Member
hi !

one more thing.
i see that its possible to do 2.2 with 90mm pistons only
without changing the crank.

maybe its a better option ?

thanks
 

Trip

New Member
By increasing the stroke, you are also increasing the piston velocity, this will induce more strain on the rods. To be safe tuners and manufactures decrease the rev limiter.

I always like to mention this example. For Instance the Honda S2000 F20C 2.0ltr engine from factory has a rev limter at 9000Rpm. When they introduced the stroked 2.2Ltr for the US market in 2004 and JDM in 2006 , they decreased the rev limter to 8000rpm.

Increasing the Rev limiter is not always beneficial, if the engine will not produce power at a high RPM, there is no reason to rev it high.

If you want to race, you need to put the engine safety factor aside.


we have mad ppl in my country, just to get the best time on the 1/4 mile , they boost the hell out of the engine. After the race the engine is just Jelly. They don't care about the engine as long as they have a good time slip.
 

oap-r

I love Rob xxx
radiobar said:
so its nonsense if i have full boost for only 1500 or 2000 rpm.
let say from 5000 to 7000
If it's only for drag racing what difference does it make that you only have a 2k power band.

Drag racing or circuit racing does not not need an engine to produce good torque from idle :doh:
 

Trip

New Member
for drag racing yes. For the track you would need a wider power band. Don't forget you need to concentrate on the bends/curves, other cars on the track and flags..

then you want to also concentrate keeping the car in a narrow power band ??

say the least, there are corners (in my case) that are very slow which is going in 2nd gear at around 4Krpm .. you would need power at 4k to go out of the curve.
 
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