Crank

[jonnyrebel2004]

I am going to have to repalce my crank and I have heard two terms, a hotrod crank and a stroker crank. What exactlly are they and what are the pros and cons of both?

 

Thanks Travis

[locogato11283]

well stroker cranks add stroke obviously. hot rods are the rods that wiseco uses on their cranks. you can buy a stock stroke crank, stock stroke long rod, 4mm standard rod, 4mm longrod. im guessing for yours youll be buying a stock stroke standard length rod. the reason for the long rod is to take stress off the rod and piston. wit hthe longrod setup you have to use the 795 series pistons. if you think you wanna go with a longer stroke you have to have your cylinders ported to match the stroke unless you use a spacer plate. haha this is turning out to be real long. what else you wanna know? i could go on forever.

[jonnyrebel2004]

well stroker cranks add stroke obviously. hot rods are the rods that wiseco uses on their cranks. you can buy a stock stroke crank, stock stroke long rod, 4mm standard rod, 4mm longrod. im guessing for yours youll be buying a stock stroke standard length rod. the reason for the long rod is to take stress off the rod and piston. wit hthe longrod setup you have to use the 795 series pistons. if you think you wanna go with a longer stroke you have to have your cylinders ported to match the stroke unless you use a spacer plate. haha this is turning out to be real long. what else you wanna know? i could go on forever.

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Well I am going to have to replace my pistons too because I had a wrist pin bearing failure. I already have a woods port job. Would I have to use a spacer plate or not? Would I loose any of my low end torque if I stroked it with 4mm long rods?

 

Thanks Travis

[Ducman]

You'll need to update the port work for the 4mm stroker crank. You can use a spacer plate or get custom cut stroker domes, the port work will depend on which way you go; domes or plate. (795 series pistons offset the 5mm longer rod plate or domes account for the extra stroke) Stroker will add more low end torque if you get a port job similar to what you have now, or same low end you have now with a lot more top end if you port for more top end.

[locogato11283]

Well I am going to have to replace my pistons too because I had a wrist pin bearing failure. I already have a woods port job. Would I have to use a spacer plate or not? Would I loose any of my low end torque if I stroked it with 4mm long rods?

 

Thanks Travis

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if you use a spacer plate on the bottom of the cylinders you will not need to reconfigure for porting. youll gain torque by stroking.

[racer]

youll gain torque by stroking.

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loco gains torque everyday.

 

 

 

 

what he says is true, and this guy would know since hes got a few of them.

[DuneRoller]

loco gains torque everyday. 

what he says is true, and this guy would know since hes got a few of them.

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[locogato11283]

loco gains torque everyday. 

what he says is true, and this guy would know since hes got a few of them.

344432[/snapback]

yea so what? i stroke all the time no big deal right?

[jonnyrebel2004]

if you use a spacer plate on the bottom of the cylinders you will not need to reconfigure for porting. youll gain torque by stroking.

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So tell me if Im right if I stroked it with 4mm long rods I wouldnt have to do anything to my port work if I used a spacer plate. All I would have to do is my the crank, pistons(wiesco 795), and a spacer plate and I would be set? Am I right or wrong?

 

Thanks Travis

[Ducman]

So tell me if Im right if I stroked it with 4mm long rods I wouldnt have to do anything to my port work if I used a spacer plate. All I would have to do is my the crank, pistons(wiesco 795), and a spacer plate and I would be set? Am I right or wrong?

 

Thanks Travis

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You could do it that way, and it would gain a lot of low end torque, but your are much better off with 4mm stroker specific porting. You wouldn't be tapping into the huge potential HP gain. If you really want to know the result of 4mm stroking without correct porting ask a builder like passionre, he could probably tell you exactly what it would run like. You could alway get porting later I suppose, but why not do it right the first time?

 

Heres what I wrote to the same question recently posted:

 

(proplem#1) If you use the spacer plate your ports will be raised that amount too. Now you need to at least lower the botom of the ports a little to compensate for raising them. (problem#2) On the +4 stroker with cut domes the ports are still centerd where they were before but with the longer stroke, the flow in and out of the cylinders is going to be different because at the same RPM as the stock stroke crank, the piston speed past the ports will be faster (also true for spacer plate) so the port timing will be diferent. The ports are designed to flow for the stock stroke. Think of it as taking the intake and exhaust cam out of a raptor and putting it in a YFZ 450. It is similar and might work but it isn't as good as if the cam were disigned for the 450.