Does anyone have any opinions on this?

Would it be better to have a B18 bored to 2 liter with stock stroke or that same bore with a stoker crank and rods to about 2.2 liters?

I am thinking the larger displacement will make a bit more power and torque, as well as spool the turbo faster, but the highest rpm you can run safely will decrease.

On the other hand, with the stock stroke, you can rev higher, but it takes higher revs to spool the turbo and make the power.

So the question is: Is it better to have smaller displacement and really high revs (like 9500-10,000) or bigger displacement and a bit lower redline (like 9000)?

Also, how will this effect top speed? I plan to use an LS tranny or at least an LS 5th gear. I would think the extra power and torque of the stroker would help get through the taller gears of the LS more quickly than the smaller displacement with less torque. 9000rpm is way more than a stock LS goes to anyway.

So would the top speed be affected much by having a 9000 rpm redline instead of 10,000?

Another consideration is that the turbo I am going to use is very large--SP71GTQ
the stroker would spool it faster, I think, but the higher revving motor may offer more power at the top end?

Thanks in advance for useful info.

 

bump

 

A stroker kit in my opinion should be used in a more hardcore setup that takes it to the next level. Such as an all motor setup that is Sleeved and stroked to get the max displacement.
In a turbo setup, its different. You can make 800+ on a non-stroked motor. So why do it.

The reason I say this is, when you do a stroker kit:
1. The cost of the crank, diff rods, and specific pistons is a good chunk of change already.
2. On to of that, your block isnt even SLEEVED yet.
3. Lets say the stroker kit takes it to like 84mm, 2.0L - thats something that can be done with a Big Bore sleeved block.

In comparison, when you sleeve the block.
1. you Strengten the block already with Iron ductile sleeves.
2. You can make it any Bore size you want. whether its 2.0L or something a bit bigger in bore.

What I am more concerned is the cost effectiveness of it all. When stroking the motor, you are using parts that arent as readily available. The crank, rods, pistons arent something that everyone carries in stock.

But if you go the sleeving route, you still use the standard length rods, off-the shelf pistons and stock crank. So if there is any damage to the motor, replacing these parts is easier.

In conclusion, Sleeved setup is already proven. Provides a strong foundation for higher boost setups.
There's no need to complicate things when a certain way already works.


Modified by exospeedAMcrx at 12:25 AM 12/2/2004

 

What he said. Even with a conventional setup, try to make it so that you don't have to chase the RPM. Size your turbo accordingly to the motor and gearing you want to use. Make them all compliment each other.

 

for clarification, the block is already bored and sleeved using darton sleeves
with the stock stroke, it comes out to be about 2 liters
cost is not the issue (within reason)
maximum performance is more important

thanks for the good info so far

 

Overall, for forced induction, I would stay with the shorter stroke for two reasons - psiton speed and dwell time. I love the GSR crank for turbo motors.

 

thanks for the info so far

anyone else have experience with a stroked honda motor or even another make 4 cylinder?