Stroke question


A

Amaury_Reno

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Feb 10, 2007
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Just to confirm, we can shortened the engine's stroke by putting a longer rod? This is in the case where the crankshaft isn't changed and is standard.
 
putting in a longer rod will alter the rod stroke ratio not the stroke itself.
 
so how can we basically change the stroke of the car? obviously by leaving the bore untouched would change the displacement but that doesn't matter
 
Using a stroker kit, B18 crankshaft and con-rods will do this (Optional to change to B18 pistons).
 
lets say i am to DECREASE the stroke, and just by changing the con-rod, would a shorter con-rod or longer con-rod decrease the stroke?
 
Shorter would decrease the stroke, however why, may I ask?
 
but wouldn't the shorter con-rod increase the distances between BDC to TDC (INCREASES the stroke)

We're trying to design a engine on paper which is part of me and my friend's 'side project' for our school and was trying to maintain it at a 1600cc displacement, now before going all out designing an whole new engine we're thinking of getting started from a NA 1600cc motor, and we're using a B16B and 4AGE for benchmark.

Im just trying to figure out the relationship of the length of con-rod affecting the stroke distances, remember the stroke we're talking bout is the distance between BDC to TDC....
 
Im no expert in this.. But when you stroke the car it effectivly becomes a 1,8.. The B16b engine is just a de-stroked B18.

Lowering the stroke will surely cause the displacement to dip under the 1600cc NA motor in which your looking for?
 
Amaury_Reno said:
Just to confirm, we can shortened the engine's stroke by putting a longer rod? This is in the case where the crankshaft isn't changed and is standard.
Click to expand...


Rod length has nothign to do with stroke. It will only alter the rodlenght/stroke ratio.
 
well we're trying on a setup with 91mm bore and 66mm stroke, so am just trying to find out the relation between the con-rod and stroke, without bringing in the crankshaft to discuss.

Im no expert in this.. But when you stroke the car it effectivly becomes a 1,8.. The B16b engine is just a de-stroked B18.
Click to expand...

Right ! Exactly! So in order to DE-STROKE the B16B again, do i need a longer rod or shorter rod? Without relation to pistons or crankshaft yet ~ Lets just forget bout the displacement end result first.
 
the only way to change the displacement of an engine is to either change the bore of the engine OR change the STROKE of the crank..
 
If you shorten the rod then surely it will be moving just as far, i.e the same stroke, just the movement of the piston will begin lower in the cylinder and end lower in the cylinder compared to the stock rod length and the actual distance moved by the piston up and down will be the same distance as stock?
 
freewilly said:
the only way to change the displacement of an engine is to either change the bore of the engine OR change the STROKE of the crank..
Click to expand...

Correct! Changing the length of rod will not change the stroke, the only way the stroke can be altered is by using a different crank, or offset machining the bearing journals. Bore speaks for itself
 
guys thank you for the response i've finally FOUND the answer i wanted ! thank you so much ~
 
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