It's been a while "W" stroker info

[Evil84Hatch]

So I've been scouring the internet until my eyes feel like they're going to pop out of my head. I'm not ready for a build this winter as I have enough on my plate to do to the car, but I need to start getting parts together this upcoming spring for a next fall/winter build/install.

Here's my question. I'm wanting to go with a 351W stroker but the car will see more street than track duty. I'm looking for 500rwhp 450rwtq n/a and spray it up to 250 on top of that. I don't want to spin the motor to the moon and want to keep it at 6500R's or less. All these things lead me to think more cubic inches as I want pull from 2000-6000 and I want it to pull like a freight train.

This being said I automatically think of the 427W. I instantly tell myself I don't need to go that big so I think well, the 408 has a square bore/stroke ratio so that could be a good candidate. Then I think, well, lets split it and go 418. What I don't remember about any of these three strokers are the side load put on the pistons in the bore is, and how reliable each kit is in street apps. I know all about having a top end that will breath and I have that under control, I just can't remember the characteristics of each of these strokers.

So I embarrasingly turn to the forum who's help I appreciate greatly to "help a brutha out".

Thanks all

 

[reddog]

A well prepared 408, with good parts and machine work, would work the best IMHO!!

 

[Evil84Hatch]

Not trying to be rude, but I'm asking for reasons for suggestions, not just suggestions. Otherwise answers to my questions in the original post would work too.

Thanks all

 

[347HO]

I'm curious.
What topend do you have?
I would think "if" you have the topend already figured out, you will already know what the rest of the setup needs to be?

 

[Evil84Hatch]

I'm curious.
What topend do you have?
I would think "if" you have the topend already figured out, you will already know what the rest of the setup needs to be?

I'm going to upgrade to TFS R's from my ported TW heads that I currently have and run the R Series upper unless I can find something that flows as well but would keep the R's down with a custom cam. I say the R upper as the cubic inches should move the workable power band down on that intake.

It's not that I don't have if figured out. It's that I don't remember which one of the three strokers I have listed above is easier on the block and pistons as far as side load, easier on rings, etc for street driving. I don't want to do a rebuild every season on this thing.

So 347HO do you think you can help me remember or do you have any other questions you'd like to throw out in relation with my original questions?

 

[NIKwoaC]

You're looking for rod/stroke ratio to determine maximum rod angularity. Most engine builders prefer r/s ratios higher than 1.5-1.6, as anything lower than that starts to put a lot of load on the sides of the pistons and cylinders.

A 408 typically has a 4.000 inch stroke and a 4.030 inch bore. Depending on the deck height and compression height on the pistons, rod length can vary, but you'll usually see a 6.200 rod length in a 408.

ROD/STROKE=6.2/4=1.55

Talk to your engine builder or supplier about their thoughts on the longer stroke Windsor engines. Some builds can use longer rods to get away with less rod angularity.

Another option is to go with a big bore (4.125) Dart block. Big bore engines breathe better because of less valve shrouding, and you can still have big cubic inches without worrying too much about rod angularity.

 

[Evil84Hatch]

You're looking for rod/stroke ratio to determine maximum rod angularity. Most engine builders prefer r/s ratios higher than 1.5-1.6, as anything lower than that starts to put a lot of load on the sides of the pistons and cylinders.

A 408 typically has a 4.000 inch stroke and a 4.030 inch bore. Depending on the deck height and compression height on the pistons, rod length can vary, but you'll usually see a 6.200 rod length in a 408.

ROD/STROKE=6.2/4=1.55

Talk to your engine builder or supplier about their thoughts on the longer stroke Windsor engines. Some builds can use longer rods to get away with less rod angularity.

Another option is to go with a big bore (4.125) Dart block. Big bore engines breathe better because of less valve shrouding, and you can still have big cubic inches without worrying too much about rod angularity.

THANK YOU! These are the type of answers I'm looking for.

Good deal on the reminder, like I said, it's been too long for me haha. Thanks again.

 

[NIKwoaC]

THANK YOU! These are the type of answers I'm looking for.

Good deal on the reminder, like I said, it's been too long for me haha. Thanks again.

I can recommend some books if you want to do more reading on it, but there is also a lot of good information on the internet about this stuff. Just google "stroker fundamentals" or "rod ratio", dodge the dirty sites that will come up, and you'll find some good reading. Good luck.

 

[Evil84Hatch]

Yeah I was ready to pull my hair out as I couldn't find the right sites to look at. I found a bunch about the strokers themselves, none about a comparison etc... and none with rod/ratios.

Thanks again