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Stroking 6 Cylinder 

 

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 Post subject: Stroking 6 Cylinder
Posted: Wed Sep 12, 2012 11:19 am 
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It's a bit of a stupid question, but I got into a fight with my father in law in regards to whether it's possible to stroke a 6 cylinder. So obviously my question is it possible?

 

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 Post subject: Re: Stroking 6 Cylinder
Posted: Wed Sep 12, 2012 11:40 am 
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Six wrote:
It's a bit of a stupid question, but I got into a fight with my father in law in regards to whether it's possible to stroke a 6 cylinder. So obviously my question is it possible?


Back in the day, they used to use a Ford 221 crank in a 202 Holden to make a 232 to 235 cube donk.
They had to cut off the flywheel flange end and put the Holden one on....and I think they had to clearence the block (where the sump bolts on), bottoms of the bores, and the camshaft too......just don't hear about that stuff anymore.

 

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 Post subject: Re: Stroking 6 Cylinder
Posted: Wed Sep 12, 2012 11:44 am 
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Yes it is.... Crescent motor sport did a 4.5 stroker and a 4.2 stroker.. Costs are high so popularity is low.
I think the killer is for the same money you built a big power turbo.
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 Post subject: Re: Stroking 6 Cylinder
Posted: Wed Sep 12, 2012 1:20 pm 
Getting Side Ways
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From memeory the Crescent engines wern't stroked, they were bored. If they went any further than the 4.5 they started hitting water jackets.

The 4.0 is a stroked 3.3, I'm pretty sure they are close to a reliable stroke limit in 4.0 config. Joe might have squeezed maybe a mm tops out of the 4.0 factory stroke, but I would bet a nut not much more.

Already a long stroke undersquare engine.

 

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 Post subject: Re: Stroking 6 Cylinder
Posted: Wed Sep 12, 2012 2:48 pm 
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Grimketel wrote:
From memeory the Crescent engines wern't stroked, they were bored. If they went any further than the 4.5 they started hitting water jackets.

The 4.0 is a stroked 3.3, I'm pretty sure they are close to a reliable stroke limit in 4.0 config. Joe might have squeezed maybe a mm tops out of the 4.0 factory stroke, but I would bet a nut not much more.

Already a long stroke undersquare engine.


the cms engines are bored and stroked.with custom ground cranks. there is no way you could even bore a 4.0 to 4.2 without changing the stroke...
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 Post subject: Re: Stroking 6 Cylinder
Posted: Wed Sep 12, 2012 5:34 pm 
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Grimketel wrote:
From memeory the Crescent engines wern't stroked, they were bored. If they went any further than the 4.5 they started hitting water jackets.

The 4.0 is a stroked 3.3, I'm pretty sure they are close to a reliable stroke limit in 4.0 config. Joe might have squeezed maybe a mm tops out of the 4.0 factory stroke, but I would bet a nut not much more.

Already a long stroke undersquare engine.


The stroke isn't that long compared the 5.4 and even the factory large capacity Honda 4 cyls have a longer stroke. (and a rev a good 1500 - 2000rpm higher)

The CMS engines used offset ground cranks with a rod from a particular Jap 6 cyl engine which was shorter and had a smaller big end to allow for the offset grind.

 

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