Crank

[Colorado700R]

That would be about 951.704 cc's and a 8 mil longer rod for a r/s ratio of 1.37:1 which is a bit nasty for my taste

Kenny, What's the stock r/s ratio?

damn.... 951 cc's..... I'm sayin give it a year and publicly there will be 1000cc rappy movin in the sand. 

The stock R/S ratio is 1.6:1.....If we used a 110 and a +20 it would be a 987. I could use a longer rod and have a larger custom piston made, no sweat. The head flow will be an issue when we get to that size. The highest flowing head I have seen is at 378 cfm (thank you very much), but I don't know that it would sufficiently feed it.

Two words........Forced Induction 

[Krandall]

whats a safe r/s ratio w/ out going overboard?


I'm a semi noob at this stuff, but learning..

From what I can think... piston size wouldn't affect r/s ratio correct. since either way it would be in the same position no matter the piston size.

do you have some sort of magical chart that says this:

If you have x size piston you can run this rod length w/ this r/s ratio?

or a way I can calculate it myself?

[Kenny]

whats a safe r/s ratio w/ out going overboard?


I'm a semi noob at this stuff, but learning..

From what I can think... piston size wouldn't affect r/s ratio correct. since either way it would be in the same position no matter the piston size.

do you have some sort of magical chart that says this:

If you have x size piston you can run this rod length w/ this r/s ratio?

or a way I can calculate it myself?

It actually comes down to some fairly complicated "simulation" math that uses the piston weight x peak g force. The limitation is material strength used on the piston and rods. In extreme cases cylinder rock can be a problem. :'(

[Krandall]

Limitation of the piston being what? How much force is being applied from the top due to compression? Or how much force is being applied from the Rod?

[Kenny]

Limitation of the piston being what? How much force is being applied from the top due to compression? Or how much force is being applied from the Rod?

The pin will pull right out. I have never had a failure  due to a compressive load.

[Krandall]

Limitation of the piston being what? How much force is being applied from the top due to compression? Or how much force is being applied from the Rod?

The pin will pull right out. I have never had a failure  due to a compressive load.

I didn't think there'd be any due to compressive load... So, What kind of pistons are people running that are running stroked/long rod apps? CP?

[Troy]

I LIKE TATER TOTS :grin_nod:

[Peelz]

I LIKE TATER TOTS :grin_nod:

give me your TOTS! 

[socalrappy700]

 

[SUB454]

Limitation of the piston being what? How much force is being applied from the top due to compression? Or how much force is being applied from the Rod?

The pin will pull right out. I have never had a failure  due to a compressive load.

I didn't think there'd be any due to compressive load... So, What kind of pistons are people running that are running stroked/long rod apps? CP?

I know of only 3 long-rod builds. RocketFactory has 2...Pauls 12mm, Gene's 15mm. Kenz has 1...Mike Askin's(I think it's an 860). I believe CP is making the pistons to the builder's spec's.

Make that 4: WhiteKnuckle sent a 20mm oversea's

[Kenny]

Everything that comes with the Barker cranks is made by Diamond to Tim's specs and use 2618 instead of 4032 material. I use Diamond for my custom pistons as well

[Krandall]

I know Hot Rods makes theirs out of 4115 Material.

I'm making my head spin thinking about stuff right now....

[Pw383426]

That would be about 951.704 cc's and a 8 mil longer rod for a r/s ratio of 1.37:1 which is a bit nasty for my taste

Kenny, What's the stock r/s ratio?

damn.... 951 cc's..... I'm sayin give it a year and publicly there will be 1000cc rappy movin in the sand. 

The stock R/S ratio is 1.6:1.....If we used a 110 and a +20 it would be a 987. I could use a longer rod and have a larger custom piston made, no sweat. The head flow will be an issue when we get to that size. The highest flowing head I have seen is at 378 cfm (thank you very much), but I don't know that it would sufficiently feed it.

Two words........Forced Induction 

That's what I'm thinking.....

[socalrappy700]

That would be about 951.704 cc's and a 8 mil longer rod for a r/s ratio of 1.37:1 which is a bit nasty for my taste

Kenny, What's the stock r/s ratio?

damn.... 951 cc's..... I'm sayin give it a year and publicly there will be 1000cc rappy movin in the sand. 

The stock R/S ratio is 1.6:1.....If we used a 110 and a +20 it would be a 987. I could use a longer rod and have a larger custom piston made, no sweat. The head flow will be an issue when we get to that size. The highest flowing head I have seen is at 378 cfm (thank you very much), but I don't know that it would sufficiently feed it.

Two words........Forced Induction 

That's what I'm thinking.....

[ordunner]

So this looks to be the place to be  It was nice to read about this as it has answered some questions for me.  I need to check with Eric with WK and see what pistion he is using in the 843 I am staying with pump gas as this is just going to be a fun duner/ play at the hill for me.  I know with my fat ass at 260lbs I will never hang with the rest but I will have fun anyway.  Who knows I might take of 20 or 40 or 60 lbs some day .  My stock CP12 to 1  lost all compreshion due to a bent valve caused by a ristpin elongation at the pistion.  Eric told me had the valve not bent the pistion would have gone one way and the rod the other So I am happy with very little damage and I get a new motor.  108mm with a +8mm rod, I think it should be a good runner with all the other parts I have.  Anyway looking forward to the 2009 raptor rally where we can run are new builds.