351 W piston ring question

[Waverous]

What is the maximum amount of bore that a 351 W can be bored out? Isn't it 60 thousandths? What CID would that give?

 

[semprbronc]

Everything I have read says .060. I just bored my 302 .040 and was told that was about 20 cu in. I don't know how they arrived at that #, but i'd guess that would mean .060 might be about 30 ?:?

 

[semprbronc]

I see you have mode GOD!!! ;D ;D ;D Congratulations are in order. Will you be drinking from howie's "cooler of plenty" now?

 

[Waverous]

[quote author=semprbronc link=board=5;threadid=12759;start=0#95513 date=1041279111]<br>I see you have mode GOD!!! ;D ;D ;D Congratulations are in order. Will you be drinking from howie's "cooler of plenty" now?<br>[/quote]<br>I can hear Howie now in a big booming James Earl Jones voice saying "Come sit with us and talk of all things Bronco while drinking from the cooler of plenty".

 

[ballistic64]

A 351W bored .060 with stock stroke length will give approx. 10 to 11 additional cubes.

 

[semprbronc]

Wow, I guess the guy that told me 20 w/.040 was just a bit off! How do you come up with the #s?

 

[67ster]

I take the area of the circle X's the stroke X's number of cylinders . Don't forget that increasing the bore also raises the compression ratio . I would have any block sonic checked before boring , it can save you money in the long run . My 2 centavos

 

[76Broncofromhell]

(4.060 / 2)squared x 3.1415927 x 3.5 x 8 = 362.5 CID but .060 over is going to cause cooling problems. By the way Waverous, how much are you into your Windsor now if you don't mind me asking? Mine is already kicking my bank account's ass with all the costs I overlooked, like balancing the rods and pistons and alignhoning the block.

 

[Waverous]

[quote author=76Broncofromhell link=board=5;threadid=12759;start=0#95684 date=1041295018]<br>(4.060 / 2)squared x 3.1415927 x 3.5 x 8 = 362.5 CID but .060 over is going to cause cooling problems. By the way Waverous, how much are you into your Windsor now if you don't mind me asking? Mine is already kicking my bank account's ass with all the costs I overlooked, like balancing the rods and pistons and alignhoning the block.<br>[/quote]<br>So far just the cost of the block - $200. I have been doing a lot of researching using a HP Book on High Performance Interchangable parts for Fords and one one regarding the performance of a 351 W.

 

[76Broncofromhell]

I have $300 in the block, (351W's are hard to come by in the SF Bay), $1200 in the Street Fighter Stroker kit, and another $1000 in the valvetrain, rockerarms, intake, and miscelaneous engine parts (oil pump, waterpump, and distributor). I have almost $2500 in this engine already and the machine work isn't even done! I hope you fare better monetarily than me on your Windsor...although the 408 Part cost me a pretty penny more than a stock crank rebuild.

 

[Guest]

[quote author=67ster link=board=5;threadid=12759;start=0#95599 date=1041289062]<br> Don't forget that increasing the bore also raises the compression ratio . [/quote]<br>Wouldn't it decrease the Comp ratio. More volume would equal less pressure.

 

[75MIKE]

The head size stays constant. So more volume is getting smashed in to the same size combustion chamber.Raising the compression.My 2 cents.

 

[MY 4 BY]

[quote author=75MIKE link=board=5;threadid=12759;start=0#95741 date=1041307971]<br>The head size stays constant. So more volume is getting smashed in to the same size combustion chamber.Raising the compression.My 2 cents.<br>[/quote]<br><br>To my way of thinking, if the combustion chamber size stays the same, if you increase the volume of the cylinder by boreing it this will decrease the conpression ratio.

 

[JMurray]

Wave, I personally wouldn`t bore over .030 unless you have to. Ford started a thinwall casting on the 289`s & I am pretty sure 351`s are the same.
As far as boring & comp ratio, it raises the ratio slightly at .030 (about a 10th of a ratio)
You might call Rob over at Blue Oval Performance, he would know about the cyl walls.
Jerry