Don's (Pebcak) 351 upgrade Project

[Pebcak]

Taller pistons

Deck the block

Stroker crank

Greek

Greek

Greek

All I get from that is that I could start to go down a rabbit hole.

When I was talking to the first engine shop the owner told me that there are a lot of "little" things they could do while redoing the engine for me to increase HP here and there. Little upgrades where all together it could make a difference without breaking the bank. Is that kinda what you're meaning above?

[Pebcak]

And you have to have new pistons, so get some that put you in the 9+ range.

Ahhh I didn't see your post cause it was on page 6.

I'll add this to the list when I'm talking to the new shop. That way I can get the 35-283-3 cam kit on order.

[Gary Lewis]

And you have to have new pistons, so get some that put you in the 9+ range.

Ahhh I didn't see your post cause it was on page 6.

I'll add this to the list when I'm talking to the new shop. That way I can get the 35-283-3 cam kit on order.

I'm not sure I'd order the cam before talking to the engine builder. He might have suggestions that you want to consider.

On the pistons, you'll find hyper eutectic and forged. You don't need forged. Go for the hyper eutectic ones.

So if you go to the engine builder and tell him what your plans are for using the truck and then say you think you want this cam and about 9 - 9.5:1 compression you give him a chance to provide suggestions. In the long run, having him bought in is good.

[ArdWrknTrk]

Taller pistons

Deck the block

Stroker crank

Greek

Greek

Greek

All I get from that is that I could start to go down a rabbit hole.

When I was talking to the first engine shop the owner told me that there are a lot of "little" things they could do while redoing the engine for me to increase HP here and there. Little upgrades where all together it could make a difference without breaking the bank. Is that kinda what you're meaning above?

 

Greek

Greek

Greek

Static compression is the ratio of cylinder + combustion chamber volume at the bottom of the stroke (BDC) V/S top of the stroke (Top Dead Center)

Taller pistons come closer to completely filling the cylinder (even exceeding, if a high crown)

So, less space left at the top of the stroke.

Decking the block cuts down the cylinder height instead of using pistons with a greater height.

(This is sometimes better because you can have more quench, which reduces knocking)

A stroker crank increases compression by making the bottom of the stroke farther down the hole.

Two fold increase of compression and displacement.

 

[Pebcak]

Static compression is the ratio of cylinder + combustion chamber volume at the bottom of the stroke (BDC) V/S top of the stroke (Top Dead Center)

Taller pistons come closer to completely filling the cylinder (even exceeding, if a high crown)

So, less space left at the top of the stroke.

Decking the block cuts down the cylinder height instead of using pistons with a greater height.

(This is sometimes better because you can have more quench, which reduces knocking)

A stroker crank increases compression by making the bottom of the stroke farther down the hole.

Two fold increase of compression and displacement.

Thank You for the explanation! I gotcha now. I'll ask this stuff when I call.

[Pebcak]

Go for the hyper eutectic ones.

So if you go to the engine builder and tell him what your plans are for using the truck and then say you think you want this cam and about 9 - 9.5:1 compression you give him a chance to provide suggestions. In the long run, having him bought in is good.

Got that on the list to discuss too. Will get with them to get their opinion before I order stuff.

Thanks!!!!

[ArdWrknTrk]

Static compression is the ratio of cylinder + combustion chamber volume at the bottom of the stroke (BDC) V/S top of the stroke (Top Dead Center)

Taller pistons come closer to completely filling the cylinder (even exceeding, if a high crown)

So, less space left at the top of the stroke.

Decking the block cuts down the cylinder height instead of using pistons with a greater height.

(This is sometimes better because you can have more quench, which reduces knocking)

A stroker crank increases compression by making the bottom of the stroke farther down the hole.

Two fold increase of compression and displacement.

Thank You for the explanation! I gotcha now. I'll ask this stuff when I call.

Your engine has a bore of 4.000" and a stroke of 3.500".

If you take the volume of a cylinder and multiply by eight you arrive at engine displacement.

Your engine is a positive displacement pump and would move this volume every two revolutions (4 stroke, or Otto cycle engine)

Taller pistons or lower decks do nothing to change this, but increasing the stroke by increasing crank pin offset makes your 3.500" into something else (say 3.750") by the time you multiplied that 1/4" by eight you have a substantial increase in displacement AND you have a new higher compression ratio, because zero is always zero.