can a stock crank be turned into a stroker crank

[Goose]

when having a stroker motor built.can a stock crank be used to build a stroker crank out of.just curious if they needed different crank webs or if they take stock webs in machine them to move the pin up.anyone know anything about building cranks please chime in
thanks

 

[Matt_E]

Yes, it's possible. The pins are relocated and welded in place and/or different rods are used.
This appears to be the least favorable stroker crank.

 

[Prem1x]

It's pretty common place in 1mm or 2mm applications. Anything bigger than 5mm I think would be out of the question.

 

[Matt_E]

It's pretty common place in 1mm or 2mm applications. Anything bigger than 5mm I think would be out of the question.

I had a +7mm stroker crank that was made from an OEM crank and 133 rods.
Sold it though.

 

[2nd nature]

ive got a 4 mil from crank works. mine works great.

 

[bad93blaster]

ive got a 4 mil from crank works. mine works great.

is it stock webs?

 

[Matt_E]

Mine had stock webs.
If you don't have stock webs, it's practically an aftermarket crank.

 

[Goose]

are the rods longer

 

[Matt_E]

That depends on the crank. There's stroker cranks with OEM rods, and non-OEM rods.

On mine, they were longer.

 

[Goose]

oem storker crank

what parts are more common to fail on these cranks the webs cracking from thepin being moved or the rods or any other parts

 

[WFO Speedracer]

My understanding was that since the web and pin are made together they cut off the stock pins and machinel the stock webs to accept a new pin at the correct location in the web to achieve the stroke that they want.

 

[Prem1x]

I had a +7mm stroker crank that was made from an OEM crank and 133 rods.
Sold it though.

I didn't mean to imply it was impossible, but a relocated pin 7mm crank would not be something I would be comfortable running.

 

[chriselmore_1]

how do i tell if a crank is a stroker? can a stroker be used with a 61x top?

 

[jetski9010]

Yes you can use if with a 61x cylinder but the pistons will pop out of the top a little and you will have to machine your head for your setup.

 

[Jawbreaker]

Yes you can use if with a 61x cylinder but the pistons will pop out of the top a little and you will have to machine your head for your setup.

I don't think you can do that with anything more than a 2mm stroker (70mm stroke) or the rings will come out the top of the cylinders...

...anything more would need to use a spacer plate or aftermarket cylinders.

 

[jetski9010]

I don't think you can do that with anything more than a 2mm stroker (70mm stroke) or the rings will come out the top of the cylinders...

...anything more would need to use a spacer plate or aftermarket cylinders.

I think you can go a little more then a 2mm storker. Prob 4-5mm would be max. I just checked one of my cylinders and from the end of the ring line there is 4.85mm to the top of the deck of the cylinder.

 

[Jawbreaker]

Have you seen or know of anyone that has used a 4-5 mil stroker crank without a spacer plate with oem cylinders?

Don't get me wrong... That would be great if you could keep the exhaust ports low...

 

[#ZERO]

The cases are the machine limit with a stroker, you can always adjust the port timing with a spacer plate beneath the cylinder or machine the domes. Also flat top pistons with a shorter compression height and sleeves with lower ports can be used. Crankworks won't build anything larger than +4mm on the stock crank webs because they'll end up cracking. I'm running a +5mm stroker with 88mm flat top pistons and custom sleeves on a 62T/61X engine. If you're looking for a stroker crank don't go the cheap route because you'll end up paying for it later.

 

[chriselmore_1]

is there any way te tell if its a stroker without spliting the cases? cylinders are already off, but fly is bolted on and i dont have another gasket. the coupler anad of the crank just has a tiny hole in the middle. not mostly hollow like a stocker.

 

[750SX]

is there any way te tell if its a stroker without spliting the cases? cylinders are already off, but fly is bolted on and i dont have another gasket. the coupler anad of the crank just has a tiny hole in the middle. not mostly hollow like a stocker.

Yes you can measure the stroke through the spark plug hole